WIN32程序，在界面上显示网页的C++代码源码
本篇文章属于《518超市播音软件开发日志》系列文章的一部分。
我在开发《518超市播音软件》（http://www.518boyin.com/）的时候，需要在界面上显示一个HTM文件，用到下面的代码。主文件是网上找到后自己修改优化的。
调用
WCHAR htmFile[MAX_PATH] = { 0 };
PathCombine(htmFile, m_pgmDir, L"welcome.htm");
m_hWebpage = create_htmPage(m_hInst, m_hWelcome, htmFile);
在窗口m_hWelcome上面显示一个网页窗口。
主文件
/* Simple.c
This is a Win32 C application (ie, no MFC, WTL, nor even any C++ -- just plain C) that demonstrates
how to embed a browser "control" (actually, an OLE object) in your own window (in order to display a
web page, or an HTML file on disk).
This example opens two windows, each containing a browser object. The first window displays an HTML
string in memory. The second window displays Microsoft's web site. We also disable the pop-up context
menu, and resize the browser to fill our window.
This is very loosely based upon a C++ example written by Chris Becke. I used that to learn the minimum
of what I needed to know about hosting the browser object. Then I wrote this example from the ground up
in C.
This requires IE 5.0 (or better) -- due to the IDocHostUIHandler interface, or a browser that supports
the same level of OLE in-place activation.
*/
#include
#include
#include
#include
#include
#include
// The class name of our Window to host the browser. It can be anything of your choosing.
static const TCHAR ClassName[] = L"518boyin_HTMLPage";
// This is used by DisplayHTMLStr(). It can be global because we never change it.
static const SAFEARRAYBOUND ArrayBound = {1, 0};
// Our IOleInPlaceFrame functions that the browser may call
static HRESULT STDMETHODCALLTYPE Frame_QueryInterface(IOleInPlaceFrame FAR* This, REFIID riid, LPVOID FAR* ppvObj);
static HRESULT STDMETHODCALLTYPE Frame_AddRef(IOleInPlaceFrame FAR* This);
static HRESULT STDMETHODCALLTYPE Frame_Release(IOleInPlaceFrame FAR* This);
static HRESULT STDMETHODCALLTYPE Frame_GetWindow(IOleInPlaceFrame FAR* This, HWND FAR* lphwnd);
static HRESULT STDMETHODCALLTYPE Frame_ContextSensitiveHelp(IOleInPlaceFrame FAR* This, BOOL fEnterMode);
static HRESULT STDMETHODCALLTYPE Frame_GetBorder(IOleInPlaceFrame FAR* This, LPRECT lprectBorder);
static HRESULT STDMETHODCALLTYPE Frame_RequestBorderSpace(IOleInPlaceFrame FAR* This, LPCBORDERWIDTHS pborderwidths);
static HRESULT STDMETHODCALLTYPE Frame_SetBorderSpace(IOleInPlaceFrame FAR* This, LPCBORDERWIDTHS pborderwidths);
static HRESULT STDMETHODCALLTYPE Frame_SetActiveObject(IOleInPlaceFrame FAR* This, IOleInPlaceActiveObject *pActiveObject, LPCOLESTR pszObjName);
static HRESULT STDMETHODCALLTYPE Frame_InsertMenus(IOleInPlaceFrame FAR* This, HMENU hmenuShared, LPOLEMENUGROUPWIDTHS lpMenuWidths);
static HRESULT STDMETHODCALLTYPE Frame_SetMenu(IOleInPlaceFrame FAR* This, HMENU hmenuShared, HOLEMENU holemenu, HWND hwndActiveObject);
static HRESULT STDMETHODCALLTYPE Frame_RemoveMenus(IOleInPlaceFrame FAR* This, HMENU hmenuShared);
static HRESULT STDMETHODCALLTYPE Frame_SetStatusText(IOleInPlaceFrame FAR* This, LPCOLESTR pszStatusText);
static HRESULT STDMETHODCALLTYPE Frame_EnableModeless(IOleInPlaceFrame FAR* This, BOOL fEnable);
static HRESULT STDMETHODCALLTYPE Frame_TranslateAccelerator(IOleInPlaceFrame FAR* This, LPMSG lpmsg, WORD wID);
// Our IOleInPlaceFrame VTable. This is the array of pointers to the above functions in our C
// program that the browser may call in order to interact with our frame window that contains
// the browser object. We must define a particular set of functions that comprise the
// IOleInPlaceFrame set of functions (see above), and then stuff pointers to those functions
// in their respective 'slots' in this table. We want the browser to use this VTable with our
// IOleInPlaceFrame structure.
static IOleInPlaceFrameVtbl MyIOleInPlaceFrameTable = {Frame_QueryInterface,
Frame_AddRef,
Frame_Release,
Frame_GetWindow,
Frame_ContextSensitiveHelp,
Frame_GetBorder,
Frame_RequestBorderSpace,
Frame_SetBorderSpace,
Frame_SetActiveObject,
Frame_InsertMenus,
Frame_SetMenu,
Frame_RemoveMenus,
Frame_SetStatusText,
Frame_EnableModeless,
Frame_TranslateAccelerator};
// We need to return an IOleInPlaceFrame struct to the browser object. And one of our IOleInPlaceFrame
// functions (Frame_GetWindow) is going to need to access our window handle. So let's create our own
// struct that starts off with an IOleInPlaceFrame struct (and that's important -- the IOleInPlaceFrame
// struct *must* be first), and then has an extra data field where we can store our own window's HWND.
//
// And because we may want to create multiple windows, each hosting its own browser object (to
// display its own web page), then we need to create a IOleInPlaceFrame struct for each window. So,
// we're not going to declare our IOleInPlaceFrame struct globally. We'll allocate it later using
// GlobalAlloc, and then stuff the appropriate HWND in it then, and also stuff a pointer to
// MyIOleInPlaceFrameTable in it. But let's just define it here.
typedef struct {
IOleInPlaceFrame frame; // The IOleInPlaceFrame must be first!
///
// Here you add any extra variables that you need
// to access in your IOleInPlaceFrame functions.
// You don't want those functions to access global
// variables, because then you couldn't use more
// than one browser object. (ie, You couldn't have
// multiple windows, each with its own embedded
// browser object to display a different web page).
//
// So here is where I added my extra HWND that my
// IOleInPlaceFrame function Frame_GetWindow() needs
// to access.
///
HWND window;
} _IOleInPlaceFrameEx;
// Our IOleClientSite functions that the browser may call
static HRESULT STDMETHODCALLTYPE Site_QueryInterface(IOleClientSite FAR* This, REFIID riid, void ** ppvObject);
static HRESULT STDMETHODCALLTYPE Site_AddRef(IOleClientSite FAR* This);
static HRESULT STDMETHODCALLTYPE Site_Release(IOleClientSite FAR* This);
static HRESULT STDMETHODCALLTYPE Site_SaveObject(IOleClientSite FAR* This);
static HRESULT STDMETHODCALLTYPE Site_GetMoniker(IOleClientSite FAR* This, DWORD dwAssign, DWORD dwWhichMoniker, IMoniker ** ppmk);
static HRESULT STDMETHODCALLTYPE Site_GetContainer(IOleClientSite FAR* This, LPOLECONTAINER FAR* ppContainer);
static HRESULT STDMETHODCALLTYPE Site_ShowObject(IOleClientSite FAR* This);
static HRESULT STDMETHODCALLTYPE Site_OnShowWindow(IOleClientSite FAR* This, BOOL fShow);
static HRESULT STDMETHODCALLTYPE Site_RequestNewObjectLayout(IOleClientSite FAR* This);
// Our IOleClientSite VTable. This is the array of pointers to the above functions in our C
// program that the browser may call in order to interact with our frame window that contains
// the browser object. We must define a particular set of functions that comprise the
// IOleClientSite set of functions (see above), and then stuff pointers to those functions
// in their respective 'slots' in this table. We want the browser to use this VTable with our
// IOleClientSite structure.
static IOleClientSiteVtbl MyIOleClientSiteTable = {Site_QueryInterface,
Site_AddRef,
Site_Release,
Site_SaveObject,
Site_GetMoniker,
Site_GetContainer,
Site_ShowObject,
Site_OnShowWindow,
Site_RequestNewObjectLayout};
// Our IDocHostUIHandler functions that the browser may call
static HRESULT STDMETHODCALLTYPE UI_QueryInterface(IDocHostUIHandler FAR* This, REFIID riid, void ** ppvObject);
static HRESULT STDMETHODCALLTYPE UI_AddRef(IDocHostUIHandler FAR* This);
static HRESULT STDMETHODCALLTYPE UI_Release(IDocHostUIHandler FAR* This);
static HRESULT STDMETHODCALLTYPE UI_ShowContextMenu(IDocHostUIHandler FAR* This, DWORD dwID, POINT __RPC_FAR *ppt, IUnknown __RPC_FAR *pcmdtReserved, IDispatch __RPC_FAR *pdispReserved);
static HRESULT STDMETHODCALLTYPE UI_GetHostInfo(IDocHostUIHandler FAR* This, DOCHOSTUIINFO __RPC_FAR *pInfo);
static HRESULT STDMETHODCALLTYPE UI_ShowUI(IDocHostUIHandler FAR* This, DWORD dwID, IOleInPlaceActiveObject __RPC_FAR *pActiveObject, IOleCommandTarget __RPC_FAR *pCommandTarget, IOleInPlaceFrame __RPC_FAR *pFrame, IOleInPlaceUIWindow __RPC_FAR *pDoc);
static HRESULT STDMETHODCALLTYPE UI_HideUI(IDocHostUIHandler FAR* This);
static HRESULT STDMETHODCALLTYPE UI_UpdateUI(IDocHostUIHandler FAR* This);
static HRESULT STDMETHODCALLTYPE UI_EnableModeless(IDocHostUIHandler FAR* This, BOOL fEnable);
static HRESULT STDMETHODCALLTYPE UI_OnDocWindowActivate(IDocHostUIHandler FAR* This, BOOL fActivate);
static HRESULT STDMETHODCALLTYPE UI_OnFrameWindowActivate(IDocHostUIHandler FAR* This, BOOL fActivate);
static HRESULT STDMETHODCALLTYPE UI_ResizeBorder(IDocHostUIHandler FAR* This, LPCRECT prcBorder, IOleInPlaceUIWindow __RPC_FAR *pUIWindow, BOOL fRameWindow);
static HRESULT STDMETHODCALLTYPE UI_TranslateAccelerator(IDocHostUIHandler FAR* This, LPMSG lpMsg, const GUID __RPC_FAR *pguidCmdGroup, DWORD nCmdID);
static HRESULT STDMETHODCALLTYPE UI_GetOptionKeyPath(IDocHostUIHandler FAR* This, LPOLESTR __RPC_FAR *pchKey, DWORD dw);
static HRESULT STDMETHODCALLTYPE UI_GetDropTarget(IDocHostUIHandler FAR* This, IDropTarget __RPC_FAR *pDropTarget, IDropTarget __RPC_FAR *__RPC_FAR *ppDropTarget);
static HRESULT STDMETHODCALLTYPE UI_GetExternal(IDocHostUIHandler FAR* This, IDispatch __RPC_FAR *__RPC_FAR *ppDispatch);
static HRESULT STDMETHODCALLTYPE UI_TranslateUrl(IDocHostUIHandler FAR* This, DWORD dwTranslate, OLECHAR __RPC_FAR *pchURLIn, OLECHAR __RPC_FAR *__RPC_FAR *ppchURLOut);
static HRESULT STDMETHODCALLTYPE UI_FilterDataObject(IDocHostUIHandler FAR* This, IDataObject __RPC_FAR *pDO, IDataObject __RPC_FAR *__RPC_FAR *ppDORet);
// Our IDocHostUIHandler VTable. This is the array of pointers to the above functions in our C
// program that the browser may call in order to replace/set certain user interface considerations
// (such as whether to display a pop-up context menu when the user right-clicks on the embedded
// browser object). We must define a particular set of functions that comprise the
// IDocHostUIHandler set of functions (see above), and then stuff pointers to those functions
// in their respective 'slots' in this table. We want the browser to use this VTable with our
// IDocHostUIHandler structure.
static IDocHostUIHandlerVtbl MyIDocHostUIHandlerTable = {UI_QueryInterface,
UI_AddRef,
UI_Release,
UI_ShowContextMenu,
UI_GetHostInfo,
UI_ShowUI,
UI_HideUI,
UI_UpdateUI,
UI_EnableModeless,
UI_OnDocWindowActivate,
UI_OnFrameWindowActivate,
UI_ResizeBorder,
UI_TranslateAccelerator,
UI_GetOptionKeyPath,
UI_GetDropTarget,
UI_GetExternal,
UI_TranslateUrl,
UI_FilterDataObject};
// We'll allocate our IDocHostUIHandler object dynamically with GlobalAlloc() for reasons outlined later.
// Our IOleInPlaceSite functions that the browser may call
static HRESULT STDMETHODCALLTYPE InPlace_QueryInterface(IOleInPlaceSite FAR* This, REFIID riid, void ** ppvObject);
static HRESULT STDMETHODCALLTYPE InPlace_AddRef(IOleInPlaceSite FAR* This);
static HRESULT STDMETHODCALLTYPE InPlace_Release(IOleInPlaceSite FAR* This);
static HRESULT STDMETHODCALLTYPE InPlace_GetWindow(IOleInPlaceSite FAR* This, HWND FAR* lphwnd);
static HRESULT STDMETHODCALLTYPE InPlace_ContextSensitiveHelp(IOleInPlaceSite FAR* This, BOOL fEnterMode);
static HRESULT STDMETHODCALLTYPE InPlace_CanInPlaceActivate(IOleInPlaceSite FAR* This);
static HRESULT STDMETHODCALLTYPE InPlace_OnInPlaceActivate(IOleInPlaceSite FAR* This);
static HRESULT STDMETHODCALLTYPE InPlace_OnUIActivate(IOleInPlaceSite FAR* This);
static HRESULT STDMETHODCALLTYPE InPlace_GetWindowContext(IOleInPlaceSite FAR* This, LPOLEINPLACEFRAME FAR* lplpFrame,LPOLEINPLACEUIWINDOW FAR* lplpDoc,LPRECT lprcPosRect,LPRECT lprcClipRect,LPOLEINPLACEFRAMEINFO lpFrameInfo);
static HRESULT STDMETHODCALLTYPE InPlace_Scroll(IOleInPlaceSite FAR* This, SIZE scrollExtent);
static HRESULT STDMETHODCALLTYPE InPlace_OnUIDeactivate(IOleInPlaceSite FAR* This, BOOL fUndoable);
static HRESULT STDMETHODCALLTYPE InPlace_OnInPlaceDeactivate(IOleInPlaceSite FAR* This);
static HRESULT STDMETHODCALLTYPE InPlace_DiscardUndoState(IOleInPlaceSite FAR* This);
static HRESULT STDMETHODCALLTYPE InPlace_DeactivateAndUndo(IOleInPlaceSite FAR* This);
static HRESULT STDMETHODCALLTYPE InPlace_OnPosRectChange(IOleInPlaceSite FAR* This, LPCRECT lprcPosRect);
// Our IOleInPlaceSite VTable. This is the array of pointers to the above functions in our C
// program that the browser may call in order to interact with our frame window that contains
// the browser object. We must define a particular set of functions that comprise the
// IOleInPlaceSite set of functions (see above), and then stuff pointers to those functions
// in their respective 'slots' in this table. We want the browser to use this VTable with our
// IOleInPlaceSite structure.
static IOleInPlaceSiteVtbl MyIOleInPlaceSiteTable = {InPlace_QueryInterface,
InPlace_AddRef,
InPlace_Release,
InPlace_GetWindow,
InPlace_ContextSensitiveHelp,
InPlace_CanInPlaceActivate,
InPlace_OnInPlaceActivate,
InPlace_OnUIActivate,
InPlace_GetWindowContext,
InPlace_Scroll,
InPlace_OnUIDeactivate,
InPlace_OnInPlaceDeactivate,
InPlace_DiscardUndoState,
InPlace_DeactivateAndUndo,
InPlace_OnPosRectChange};
// We need to pass our IOleClientSite structure to OleCreate (which in turn gives it to the browser).
// But the browser is also going to ask our IOleClientSite's QueryInterface() to return a pointer to
// our IOleInPlaceSite and/or IDocHostUIHandler structs. So we'll need to have those pointers handy.
// Plus, some of our IOleClientSite and IOleInPlaceSite functions will need to have the HWND to our
// window, and also a pointer to our IOleInPlaceFrame struct. So let's create a single struct that
// has the IOleClientSite, IOleInPlaceSite, IDocHostUIHandler, and IOleInPlaceFrame structs all inside
// it (so we can easily get a pointer to any one from any of those structs' functions). As long as the
// IOleClientSite struct is the very first thing in this custom struct, it's all ok. We can still pass
// it to OleCreate() and pretend that it's an ordinary IOleClientSite. We'll call this new struct a
// _IOleClientSiteEx.
//
// And because we may want to create multiple windows, each hosting its own browser object (to
// display its own web page), then we need to create a unique _IOleClientSiteEx struct for
// each window. So, we're not going to declare this struct globally. We'll allocate it later
// using GlobalAlloc, and then initialize the structs within it.
typedef struct {
IOleInPlaceSite inplace; // My IOleInPlaceSite object. Must be first with in _IOleInPlaceSiteEx.
///
// Here you add any extra variables that you need
// to access in your IOleInPlaceSite functions.
//
// So here is where I added my IOleInPlaceFrame
// struct. If you need extra variables, add them
// at the end.
///
_IOleInPlaceFrameEx frame; // My IOleInPlaceFrame object. Must be first within my _IOleInPlaceFrameEx
} _IOleInPlaceSiteEx;
typedef struct {
IDocHostUIHandler ui; // My IDocHostUIHandler object. Must be first.
///
// Here you add any extra variables that you need
// to access in your IDocHostUIHandler functions.
///
} _IDocHostUIHandlerEx;
typedef struct {
IOleClientSite client; // My IOleClientSite object. Must be first.
_IOleInPlaceSiteEx inplace; // My IOleInPlaceSite object. A convenient place to put it.
_IDocHostUIHandlerEx ui; // My IDocHostUIHandler object. Must be first within my _IDocHostUIHandlerEx.
///
// Here you add any extra variables that you need
// to access in your IOleClientSite functions.
///
} _IOleClientSiteEx;
// This is a simple C example. There are lots more things you can control about the browser object, but
// we don't do it in this example. _Many_ of the functions we provide below for the browser to call, will
// never actually be called by the browser in our example. Why? Because we don't do certain things
// with the browser that would require it to call those functions (even though we need to provide
// at least some stub for all of the functions).
//
// So, for these "dummy functions" that we don't expect the browser to call, we'll just stick in some
// assembly code that causes a debugger breakpoint and tells the browser object that we don't support
// the functionality. That way, if you try to do more things with the browser object, and it starts
// calling these "dummy functions", you'll know which ones you should add more meaningful code to.
#define NOTIMPLEMENTED _ASSERT(0); return(E_NOTIMPL)
My IDocHostUIHandler functions //
// The browser object asks us for the pointer to our IDocHostUIHandler object by calling our IOleClientSite's
// QueryInterface (ie, Site_QueryInterface) and specifying a REFIID of IID_IDocHostUIHandler.
//
// NOTE: You need at least IE 4.0. Previous versions do not ask for, nor utilize, our IDocHostUIHandler functions.
static HRESULT STDMETHODCALLTYPE UI_QueryInterface(IDocHostUIHandler FAR* This, REFIID riid, LPVOID FAR* ppvObj)
{
// The browser assumes that our IDocHostUIHandler object is associated with our IOleClientSite
// object. So it is possible that the browser may call our IDocHostUIHandler's QueryInterface()
// to ask us to return a pointer to our IOleClientSite, in the same way that the browser calls
// our IOleClientSite's QueryInterface() to ask for a pointer to our IDocHostUIHandler.
//
// Rather than duplicate much of the code in IOleClientSite's QueryInterface, let's just get
// a pointer to our _IOleClientSiteEx object, substitute it as the 'This' arg, and call our
// our IOleClientSite's QueryInterface. Note that since our _IDocHostUIHandlerEx is embedded right
// inside our _IOleClientSiteEx, and comes immediately after the _IOleInPlaceSiteEx, we can employ
// the following trickery to get the pointer to our _IOleClientSiteEx.
return(Site_QueryInterface((IOleClientSite *)((char *)This - sizeof(IOleClientSite) - sizeof(_IOleInPlaceSiteEx)), riid, ppvObj));
}
HRESULT STDMETHODCALLTYPE UI_AddRef(IDocHostUIHandler FAR* This)
{
return(1);
}
HRESULT STDMETHODCALLTYPE UI_Release(IDocHostUIHandler FAR* This)
{
return(1);
}
// Called when the browser object is about to display its context menu.
HRESULT STDMETHODCALLTYPE UI_ShowContextMenu(IDocHostUIHandler FAR* This, DWORD dwID, POINT __RPC_FAR *ppt, IUnknown __RPC_FAR *pcmdtReserved, IDispatch __RPC_FAR *pdispReserved)
{
// If desired, we can pop up your own custom context menu here. Of course,
// we would need some way to get our window handle, so what we'd probably
// do is like what we did with our IOleInPlaceFrame object. We'd define and create
// our own IDocHostUIHandlerEx object with an embedded IDocHostUIHandler at the
// start of it. Then we'd add an extra HWND field to store our window handle.
// It could look like this:
//
// typedef struct _IDocHostUIHandlerEx {
// IDocHostUIHandler ui; // The IDocHostUIHandler must be first!
// HWND window;
// } IDocHostUIHandlerEx;
//
// Of course, we'd need a unique IDocHostUIHandlerEx object for each window, so
// EmbedBrowserObject() would have to allocate one of those too. And that's
// what we'd pass to our browser object (and it would in turn pass it to us
// here, instead of 'This' being a IDocHostUIHandler *).
// We will return S_OK to tell the browser not to display its default context menu,
// or return S_FALSE to let the browser show its default context menu. For this
// example, we wish to disable the browser's default context menu.
return(S_OK);
}
// Called at initialization of the browser object UI. We can set various features of the browser object here.
HRESULT STDMETHODCALLTYPE UI_GetHostInfo(IDocHostUIHandler FAR* This, DOCHOSTUIINFO __RPC_FAR *pInfo)
{
pInfo->cbSize = sizeof(DOCHOSTUIINFO);
// Set some flags. We don't want any 3D border. You can do other things like hide
// the scroll bar (DOCHOSTUIFLAG_SCROLL_NO), display picture display (DOCHOSTUIFLAG_NOPICS),
// disable any script running when the page is loaded (DOCHOSTUIFLAG_DISABLE_SCRIPT_INACTIVE),
// open a site in a new browser window when the user clicks on some link (DOCHOSTUIFLAG_OPENNEWWIN),
// and lots of other things. See the MSDN docs on the DOCHOSTUIINFO struct passed to us.
pInfo->dwFlags = DOCHOSTUIFLAG_NO3DBORDER;
// Set what happens when the user double-clicks on the object. Here we use the default.
pInfo->dwDoubleClick = DOCHOSTUIDBLCLK_DEFAULT;
return(S_OK);
}
// Called when the browser object shows its UI. This allows us to replace its menus and toolbars by creating our
// own and displaying them here.
HRESULT STDMETHODCALLTYPE UI_ShowUI(IDocHostUIHandler FAR* This, DWORD dwID, IOleInPlaceActiveObject __RPC_FAR *pActiveObject, IOleCommandTarget __RPC_FAR *pCommandTarget, IOleInPlaceFrame __RPC_FAR *pFrame, IOleInPlaceUIWindow __RPC_FAR *pDoc)
{
// We've already got our own UI in place so just return S_OK to tell the browser
// not to display its menus/toolbars. Otherwise we'd return S_FALSE to let it do
// that.
return(S_OK);
}
// Called when browser object hides its UI. This allows us to hide any menus/toolbars we created in ShowUI.
HRESULT STDMETHODCALLTYPE UI_HideUI(IDocHostUIHandler FAR* This)
{
return(S_OK);
}
// Called when the browser object wants to notify us that the command state has changed. We should update any
// controls we have that are dependent upon our embedded object, such as "Back", "Forward", "Stop", or "Home"
// buttons.
HRESULT STDMETHODCALLTYPE UI_UpdateUI(IDocHostUIHandler FAR* This)
{
// We update our UI in our window message loop so we don't do anything here.
return(S_OK);
}
// Called from the browser object's IOleInPlaceActiveObject object's EnableModeless() function. Also
// called when the browser displays a modal dialog box.
HRESULT STDMETHODCALLTYPE UI_EnableModeless(IDocHostUIHandler FAR* This, BOOL fEnable)
{
return(S_OK);
}
// Called from the browser object's IOleInPlaceActiveObject object's OnDocWindowActivate() function.
// This informs off of when the object is getting/losing the focus.
HRESULT STDMETHODCALLTYPE UI_OnDocWindowActivate(IDocHostUIHandler FAR* This, BOOL fActivate)
{
return(S_OK);
}
// Called from the browser object's IOleInPlaceActiveObject object's OnFrameWindowActivate() function.
HRESULT STDMETHODCALLTYPE UI_OnFrameWindowActivate(IDocHostUIHandler FAR* This, BOOL fActivate)
{
return(S_OK);
}
// Called from the browser object's IOleInPlaceActiveObject object's ResizeBorder() function.
HRESULT STDMETHODCALLTYPE UI_ResizeBorder(IDocHostUIHandler FAR* This, LPCRECT prcBorder, IOleInPlaceUIWindow __RPC_FAR *pUIWindow, BOOL fRameWindow)
{
return(S_OK);
}
// Called from the browser object's TranslateAccelerator routines to translate key strokes to commands.
HRESULT STDMETHODCALLTYPE UI_TranslateAccelerator(IDocHostUIHandler FAR* This, LPMSG lpMsg, const GUID __RPC_FAR *pguidCmdGroup, DWORD nCmdID)
{
// We don't intercept any keystrokes, so we do nothing here. But for example, if we wanted to
// override the TAB key, perhaps do something with it ourselves, and then tell the browser
// not to do anything with this keystroke, we'd do:
//
// if (pMsg && pMsg->message == WM_KEYDOWN && pMsg->wParam == VK_TAB)
// {
// // Here we do something as a result of a TAB key press.
//
// // Tell the browser not to do anything with it.
// return(S_FALSE);
// }
//
// // Otherwise, let the browser do something with this message.
// return(S_OK);
// For our example, we want to make sure that the user can invoke some key to popup the context
// menu, so we'll tell it to ignore all messages.
return(S_FALSE);
}
// Called by the browser object to find where the host wishes the browser to get its options in the registry.
// We can use this to prevent the browser from using its default settings in the registry, by telling it to use
// some other registry key we've setup with the options we want.
HRESULT STDMETHODCALLTYPE UI_GetOptionKeyPath(IDocHostUIHandler FAR* This, LPOLESTR __RPC_FAR *pchKey, DWORD dw)
{
// Let the browser use its default registry settings.
return(S_FALSE);
}
// Called by the browser object when it is used as a drop target. We can supply our own IDropTarget object,
// IDropTarget functions, and IDropTarget VTable if we want to determine what happens when someone drags and
// drops some object on our embedded browser object.
HRESULT STDMETHODCALLTYPE UI_GetDropTarget(IDocHostUIHandler FAR* This, IDropTarget __RPC_FAR *pDropTarget, IDropTarget __RPC_FAR *__RPC_FAR *ppDropTarget)
{
// Return our IDropTarget object associated with this IDocHostUIHandler object. I don't
// know why we don't do this via UI_QueryInterface(), but we don't.
// NOTE: If we want/need an IDropTarget interface, then we would have had to setup our own
// IDropTarget functions, IDropTarget VTable, and create an IDropTarget object. We'd want to put
// a pointer to the IDropTarget object in our own custom IDocHostUIHandlerEx object (like how
// we may add an HWND field for the use of UI_ShowContextMenu). So when we created our
// IDocHostUIHandlerEx object, maybe we'd add a 'idrop' field to the end of it, and
// store a pointer to our IDropTarget object there. Then we could return this pointer as so:
//
// *pDropTarget = ((IDocHostUIHandlerEx FAR *)This)->idrop;
// return(S_OK);
// But for our purposes, we don't need an IDropTarget object, so we'll tell whomever is calling
// us that we don't have one.
return(S_FALSE);
}
// Called by the browser when it wants a pointer to our IDispatch object. This object allows us to expose
// our own automation interface (ie, our own COM objects) to other entities that are running within the
// context of the browser so they can call our functions if they want. An example could be a javascript
// running in the URL we display could call our IDispatch functions. We'd write them so that any args passed
// to them would use the generic datatypes like a BSTR for utmost flexibility.
HRESULT STDMETHODCALLTYPE UI_GetExternal(IDocHostUIHandler FAR* This, IDispatch __RPC_FAR *__RPC_FAR *ppDispatch)
{
// Return our IDispatch object associated with this IDocHostUIHandler object. I don't
// know why we don't do this via UI_QueryInterface(), but we don't.
// NOTE: If we want/need an IDispatch interface, then we would have had to setup our own
// IDispatch functions, IDispatch VTable, and create an IDispatch object. We'd want to put
// a pointer to the IDispatch object in our custom _IDocHostUIHandlerEx object (like how
// we may add an HWND field for the use of UI_ShowContextMenu). So when we defined our
// _IDocHostUIHandlerEx object, maybe we'd add a 'idispatch' field to the end of it, and
// store a pointer to our IDispatch object there. Then we could return this pointer as so:
//
// *ppDispatch = ((_IDocHostUIHandlerEx FAR *)This)->idispatch;
// return(S_OK);
// But for our purposes, we don't need an IDispatch object, so we'll tell whomever is calling
// us that we don't have one. Note: We must set ppDispatch to 0 if we don't return our own
// IDispatch object.
*ppDispatch = 0;
return(S_FALSE);
}
// Called by the browser object to give us an opportunity to modify the URL to be loaded.
HRESULT STDMETHODCALLTYPE UI_TranslateUrl(IDocHostUIHandler FAR* This, DWORD dwTranslate, OLECHAR __RPC_FAR *pchURLIn, OLECHAR __RPC_FAR *__RPC_FAR *ppchURLOut)
{
// We don't need to modify the URL. Note: We need to set ppchURLOut to 0 if we don't
// return an OLECHAR (buffer) containing a modified version of pchURLIn.
*ppchURLOut = 0;
return(S_FALSE);
}
// Called by the browser when it does cut/paste to the clipboard. This allows us to block certain clipboard
// formats or support additional clipboard formats.
HRESULT STDMETHODCALLTYPE UI_FilterDataObject(IDocHostUIHandler FAR* This, IDataObject __RPC_FAR *pDO, IDataObject __RPC_FAR *__RPC_FAR *ppDORet)
{
// Return our IDataObject object associated with this IDocHostUIHandler object. I don't
// know why we don't do this via UI_QueryInterface(), but we don't.
// NOTE: If we want/need an IDataObject interface, then we would have had to setup our own
// IDataObject functions, IDataObject VTable, and create an IDataObject object. We'd want to put
// a pointer to the IDataObject object in our custom _IDocHostUIHandlerEx object (like how
// we may add an HWND field for the use of UI_ShowContextMenu). So when we defined our
// _IDocHostUIHandlerEx object, maybe we'd add a 'idata' field to the end of it, and
// store a pointer to our IDataObject object there. Then we could return this pointer as so:
//
// *ppDORet = ((_IDocHostUIHandlerEx FAR *)This)->idata;
// return(S_OK);
// But for our purposes, we don't need an IDataObject object, so we'll tell whomever is calling
// us that we don't have one. Note: We must set ppDORet to 0 if we don't return our own
// IDataObject object.
*ppDORet = 0;
return(S_FALSE);
}
// My IOleClientSite functions /
// We give the browser object a pointer to our IOleClientSite object when we call OleCreate() or DoVerb().
/************************* Site_QueryInterface() *************************
* The browser object calls this when it wants a pointer to one of our
* IOleClientSite, IDocHostUIHandler, or IOleInPlaceSite structures. They
* are all accessible via the _IOleClientSiteEx struct we allocated in
* EmbedBrowserObject() and passed to DoVerb() and OleCreate().
*
* This = A pointer to whatever _IOleClientSiteEx struct we passed to
* OleCreate() or DoVerb().
* riid = A GUID struct that the browser passes us to clue us as to
* which type of struct (object) it would like a pointer
* returned for.
* ppvObject = Where the browser wants us to return a pointer to the
* appropriate struct. (ie, It passes us a handle to fill in).
*
* RETURNS: S_OK if we return the struct, or E_NOINTERFACE if we don't have
* the requested struct.
*/
HRESULT STDMETHODCALLTYPE Site_QueryInterface(IOleClientSite FAR* This, REFIID riid, void ** ppvObject)
{
// It just so happens that the first arg passed to us is our _IOleClientSiteEx struct we allocated
// and passed to DoVerb() and OleCreate(). Nevermind that 'This' is declared is an IOleClientSite *.
// Remember that in EmbedBrowserObject(), we allocated our own _IOleClientSiteEx struct, and lied
// to OleCreate() and DoVerb() -- passing our _IOleClientSiteEx struct and saying it was an
// IOleClientSite struct. It's ok. An _IOleClientSiteEx starts with an embedded IOleClientSite, so
// the browser didn't mind. So that's what the browser object is passing us now. The browser doesn't
// know that it's really an _IOleClientSiteEx struct. But we do. So we can recast it and use it as
// so here.
// If the browser is asking us to match IID_IOleClientSite, then it wants us to return a pointer to
// our IOleClientSite struct. Then the browser will use the VTable in that struct to call our
// IOleClientSite functions. It will also pass this same pointer to all of our IOleClientSite
// functions.
//
// Actually, we're going to lie to the browser again. We're going to return our own _IOleClientSiteEx
// struct, and tell the browser that it's a IOleClientSite struct. It's ok. The first thing in our
// _IOleClientSiteEx is an embedded IOleClientSite, so the browser doesn't mind. We want the browser
// to continue passing our _IOleClientSiteEx pointer wherever it would normally pass a IOleClientSite
// pointer.
//
// The IUnknown interface uses the same VTable as the first object in our _IOleClientSiteEx
// struct (which happens to be an IOleClientSite). So if the browser is asking us to match
// IID_IUnknown, then we'll also return a pointer to our _IOleClientSiteEx.
if (!memcmp(riid, &IID_IUnknown, sizeof(GUID)) || !memcmp(riid, &IID_IOleClientSite, sizeof(GUID)))
*ppvObject = &((_IOleClientSiteEx *)This)->client;
// If the browser is asking us to match IID_IOleInPlaceSite, then it wants us to return a pointer to
// our IOleInPlaceSite struct. Then the browser will use the VTable in that struct to call our
// IOleInPlaceSite functions. It will also pass this same pointer to all of our IOleInPlaceSite
// functions (except for Site_QueryInterface, Site_AddRef, and Site_Release. Those will always get
// the pointer to our _IOleClientSiteEx.
//
// Actually, we're going to lie to the browser. We're going to return our own _IOleInPlaceSiteEx
// struct, and tell the browser that it's a IOleInPlaceSite struct. It's ok. The first thing in
// our _IOleInPlaceSiteEx is an embedded IOleInPlaceSite, so the browser doesn't mind. We want the
// browser to continue passing our _IOleInPlaceSiteEx pointer wherever it would normally pass a
// IOleInPlaceSite pointer.
else if (!memcmp(riid, &IID_IOleInPlaceSite, sizeof(GUID)))
*ppvObject = &((_IOleClientSiteEx *)This)->inplace;
// If the browser is asking us to match IID_IDocHostUIHandler, then it wants us to return a pointer to
// our IDocHostUIHandler struct. Then the browser will use the VTable in that struct to call our
// IDocHostUIHandler functions. It will also pass this same pointer to all of our IDocHostUIHandler
// functions (except for Site_QueryInterface, Site_AddRef, and Site_Release. Those will always get
// the pointer to our _IOleClientSiteEx.
//
// Actually, we're going to lie to the browser. We're going to return our own _IDocHostUIHandlerEx
// struct, and tell the browser that it's a IDocHostUIHandler struct. It's ok. The first thing in
// our _IDocHostUIHandlerEx is an embedded IDocHostUIHandler, so the browser doesn't mind. We want the
// browser to continue passing our _IDocHostUIHandlerEx pointer wherever it would normally pass a
// IDocHostUIHandler pointer. My, we're really playing dirty tricks on the browser here. heheh.
else if (!memcmp(riid, &IID_IDocHostUIHandler, sizeof(GUID)))
*ppvObject = &((_IOleClientSiteEx *)This)->ui;
// For other types of objects the browser wants, just report that we don't have any such objects.
// NOTE: If you want to add additional functionality to your browser hosting, you may need to
// provide some more objects here. You'll have to investigate what the browser is asking for
// (ie, what REFIID it is passing).
else
{
*ppvObject = 0;
return(E_NOINTERFACE);
}
return(S_OK);
}
HRESULT STDMETHODCALLTYPE Site_AddRef(IOleClientSite FAR* This)
{
return(1);
}
HRESULT STDMETHODCALLTYPE Site_Release(IOleClientSite FAR* This)
{
return(1);
}
HRESULT STDMETHODCALLTYPE Site_SaveObject(IOleClientSite FAR* This)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Site_GetMoniker(IOleClientSite FAR* This, DWORD dwAssign, DWORD dwWhichMoniker, IMoniker ** ppmk)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Site_GetContainer(IOleClientSite FAR* This, LPOLECONTAINER FAR* ppContainer)
{
// Tell the browser that we are a simple object and don't support a container
*ppContainer = 0;
return(E_NOINTERFACE);
}
HRESULT STDMETHODCALLTYPE Site_ShowObject(IOleClientSite FAR* This)
{
return(S_OK);
}
HRESULT STDMETHODCALLTYPE Site_OnShowWindow(IOleClientSite FAR* This, BOOL fShow)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Site_RequestNewObjectLayout(IOleClientSite FAR* This)
{
NOTIMPLEMENTED;
}
// My IOleInPlaceSite functions /
// The browser object asks us for the pointer to our IOleInPlaceSite object by calling our IOleClientSite's
// QueryInterface (ie, Site_QueryInterface) and specifying a REFIID of IID_IOleInPlaceSite.
static HRESULT STDMETHODCALLTYPE InPlace_QueryInterface(IOleInPlaceSite FAR* This, REFIID riid, LPVOID FAR* ppvObj)
{
// The browser assumes that our IOleInPlaceSite object is associated with our IOleClientSite
// object. So it is possible that the browser may call our IOleInPlaceSite's QueryInterface()
// to ask us to return a pointer to our IOleClientSite, in the same way that the browser calls
// our IOleClientSite's QueryInterface() to ask for a pointer to our IOleInPlaceSite.
//
// Rather than duplicate much of the code in IOleClientSite's QueryInterface, let's just get
// a pointer to our _IOleClientSiteEx object, substitute it as the 'This' arg, and call our
// our IOleClientSite's QueryInterface. Note that since our IOleInPlaceSite is embedded right
// inside our _IOleClientSiteEx, and comes immediately after the IOleClientSite, we can employ
// the following trickery to get the pointer to our _IOleClientSiteEx.
return(Site_QueryInterface((IOleClientSite *)((char *)This - sizeof(IOleClientSite)), riid, ppvObj));
}
HRESULT STDMETHODCALLTYPE InPlace_AddRef(IOleInPlaceSite FAR* This)
{
return(1);
}
HRESULT STDMETHODCALLTYPE InPlace_Release(IOleInPlaceSite FAR* This)
{
return(1);
}
HRESULT STDMETHODCALLTYPE InPlace_GetWindow(IOleInPlaceSite FAR* This, HWND FAR* lphwnd)
{
// Return the HWND of the window that contains this browser object. We stored that
// HWND in our _IOleInPlaceSiteEx struct. Nevermind that the function declaration for
// Site_GetWindow says that 'This' is an IOleInPlaceSite *. Remember that in
// EmbedBrowserObject(), we allocated our own _IOleInPlaceSiteEx struct which
// contained an embedded IOleInPlaceSite struct within it. And when the browser
// called Site_QueryInterface() to get a pointer to our IOleInPlaceSite object, we
// returned a pointer to our _IOleClientSiteEx. The browser doesn't know this. But
// we do. That's what we're really being passed, so we can recast it and use it as
// so here.
*lphwnd = ((_IOleInPlaceSiteEx FAR*)This)->frame.window;
return(S_OK);
}
HRESULT STDMETHODCALLTYPE InPlace_ContextSensitiveHelp(IOleInPlaceSite FAR* This, BOOL fEnterMode)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE InPlace_CanInPlaceActivate(IOleInPlaceSite FAR* This)
{
// Tell the browser we can in place activate
return(S_OK);
}
HRESULT STDMETHODCALLTYPE InPlace_OnInPlaceActivate(IOleInPlaceSite FAR* This)
{
// Tell the browser we did it ok
return(S_OK);
}
HRESULT STDMETHODCALLTYPE InPlace_OnUIActivate(IOleInPlaceSite FAR* This)
{
return(S_OK);
}
HRESULT STDMETHODCALLTYPE InPlace_GetWindowContext(IOleInPlaceSite FAR* This, LPOLEINPLACEFRAME FAR* lplpFrame, LPOLEINPLACEUIWINDOW FAR* lplpDoc, LPRECT lprcPosRect, LPRECT lprcClipRect, LPOLEINPLACEFRAMEINFO lpFrameInfo)
{
// Give the browser the pointer to our IOleInPlaceFrame struct. We stored that pointer
// in our _IOleInPlaceSiteEx struct. Nevermind that the function declaration for
// Site_GetWindowContext says that 'This' is an IOleInPlaceSite *. Remember that in
// EmbedBrowserObject(), we allocated our own _IOleInPlaceSiteEx struct which
// contained an embedded IOleInPlaceSite struct within it. And when the browser
// called Site_QueryInterface() to get a pointer to our IOleInPlaceSite object, we
// returned a pointer to our _IOleClientSiteEx. The browser doesn't know this. But
// we do. That's what we're really being passed, so we can recast it and use it as
// so here.
//
// Actually, we're giving the browser a pointer to our own _IOleInPlaceSiteEx struct,
// but telling the browser that it's a IOleInPlaceSite struct. No problem. Our
// _IOleInPlaceSiteEx starts with an embedded IOleInPlaceSite, so the browser is
// cool with it. And we want the browser to pass a pointer to this _IOleInPlaceSiteEx
// wherever it would pass a IOleInPlaceSite struct to our IOleInPlaceSite functions.
*lplpFrame = (LPOLEINPLACEFRAME)&((_IOleInPlaceSiteEx *)This)->frame;
// We have no OLEINPLACEUIWINDOW
*lplpDoc = 0;
// Fill in some other info for the browser
lpFrameInfo->fMDIApp = FALSE;
lpFrameInfo->hwndFrame = ((_IOleInPlaceFrameEx *)*lplpFrame)->window;
lpFrameInfo->haccel = 0;
lpFrameInfo->cAccelEntries = 0;
// Give the browser the dimensions of where it can draw. We give it our entire window to fill.
// We do this in InPlace_OnPosRectChange() which is called right when a window is first
// created anyway, so no need to duplicate it here.
// GetClientRect(lpFrameInfo->hwndFrame, lprcPosRect);
// GetClientRect(lpFrameInfo->hwndFrame, lprcClipRect);
return(S_OK);
}
HRESULT STDMETHODCALLTYPE InPlace_Scroll(IOleInPlaceSite FAR* This, SIZE scrollExtent)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE InPlace_OnUIDeactivate(IOleInPlaceSite FAR* This, BOOL fUndoable)
{
return(S_OK);
}
HRESULT STDMETHODCALLTYPE InPlace_OnInPlaceDeactivate(IOleInPlaceSite FAR* This)
{
return(S_OK);
}
HRESULT STDMETHODCALLTYPE InPlace_DiscardUndoState(IOleInPlaceSite FAR* This)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE InPlace_DeactivateAndUndo(IOleInPlaceSite FAR* This)
{
NOTIMPLEMENTED;
}
// Called when the position of the browser object is changed, such as when we call the IWebBrowser2's put_Width(),
// put_Height(), put_Left(), or put_Right().
HRESULT STDMETHODCALLTYPE InPlace_OnPosRectChange(IOleInPlaceSite FAR* This, LPCRECT lprcPosRect)
{
IOleObject *browserObject;
IOleInPlaceObject *inplace;
// We need to get the browser's IOleInPlaceObject object so we can call its SetObjectRects
// function.
browserObject = *((IOleObject **)((char *)This - sizeof(IOleObject *) - sizeof(IOleClientSite)));
if (!browserObject->lpVtbl->QueryInterface(browserObject, &IID_IOleInPlaceObject, (void**)&inplace))
{
// Give the browser the dimensions of where it can draw.
inplace->lpVtbl->SetObjectRects(inplace, lprcPosRect, lprcPosRect);
inplace->lpVtbl->Release(inplace);
}
return(S_OK);
}
// My IOleInPlaceFrame functions /
HRESULT STDMETHODCALLTYPE Frame_QueryInterface(IOleInPlaceFrame FAR* This, REFIID riid, LPVOID FAR* ppvObj)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Frame_AddRef(IOleInPlaceFrame FAR* This)
{
return(1);
}
HRESULT STDMETHODCALLTYPE Frame_Release(IOleInPlaceFrame FAR* This)
{
return(1);
}
HRESULT STDMETHODCALLTYPE Frame_GetWindow(IOleInPlaceFrame FAR* This, HWND FAR* lphwnd)
{
// Give the browser the HWND to our window that contains the browser object. We
// stored that HWND in our IOleInPlaceFrame struct. Nevermind that the function
// declaration for Frame_GetWindow says that 'This' is an IOleInPlaceFrame *. Remember
// that in EmbedBrowserObject(), we allocated our own IOleInPlaceFrameEx struct which
// contained an embedded IOleInPlaceFrame struct within it. And then we lied when
// Site_GetWindowContext() returned that IOleInPlaceFrameEx. So that's what the
// browser is passing us. It doesn't know that. But we do. So we can recast it and
// use it as so here.
*lphwnd = ((_IOleInPlaceFrameEx *)This)->window;
return(S_OK);
}
HRESULT STDMETHODCALLTYPE Frame_ContextSensitiveHelp(IOleInPlaceFrame FAR* This, BOOL fEnterMode)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Frame_GetBorder(IOleInPlaceFrame FAR* This, LPRECT lprectBorder)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Frame_RequestBorderSpace(IOleInPlaceFrame FAR* This, LPCBORDERWIDTHS pborderwidths)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Frame_SetBorderSpace(IOleInPlaceFrame FAR* This, LPCBORDERWIDTHS pborderwidths)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Frame_SetActiveObject(IOleInPlaceFrame FAR* This, IOleInPlaceActiveObject *pActiveObject, LPCOLESTR pszObjName)
{
return(S_OK);
}
HRESULT STDMETHODCALLTYPE Frame_InsertMenus(IOleInPlaceFrame FAR* This, HMENU hmenuShared, LPOLEMENUGROUPWIDTHS lpMenuWidths)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Frame_SetMenu(IOleInPlaceFrame FAR* This, HMENU hmenuShared, HOLEMENU holemenu, HWND hwndActiveObject)
{
return(S_OK);
}
HRESULT STDMETHODCALLTYPE Frame_RemoveMenus(IOleInPlaceFrame FAR* This, HMENU hmenuShared)
{
NOTIMPLEMENTED;
}
HRESULT STDMETHODCALLTYPE Frame_SetStatusText(IOleInPlaceFrame FAR* This, LPCOLESTR pszStatusText)
{
return(S_OK);
}
HRESULT STDMETHODCALLTYPE Frame_EnableModeless(IOleInPlaceFrame FAR* This, BOOL fEnable)
{
return(S_OK);
}
HRESULT STDMETHODCALLTYPE Frame_TranslateAccelerator(IOleInPlaceFrame FAR* This, LPMSG lpmsg, WORD wID)
{
NOTIMPLEMENTED;
}
/*************************** UnEmbedBrowserObject() ************************
* Called to detach the browser object from our host window, and free its
* resources, right before we destroy our window.
*
* hwnd = Handle to the window hosting the browser object.
*
* NOTE: The pointer to the browser object must have been stored in the
* window's USERDATA field. In other words, don't call UnEmbedBrowserObject().
* with a HWND that wasn't successfully passed to EmbedBrowserObject().
*/
static void UnEmbedBrowserObject(HWND hwnd)
{
IOleObject **browserHandle;
IOleObject *browserObject;
// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
// we initially attached the browser object to this window.
if ((browserHandle = (IOleObject **)GetWindowLong(hwnd, GWL_USERDATA)))
{
// Unembed the browser object, and release its resources.
browserObject = *browserHandle;
browserObject->lpVtbl->Close(browserObject, OLECLOSE_NOSAVE);
browserObject->lpVtbl->Release(browserObject);
GlobalFree(browserHandle);
return;
}
// You must have called this for a window that wasn't successfully passed to EmbedBrowserObject().
// Bad boy!
_ASSERT(0);
}
#define WEBPAGE_GOBACK 0
#define WEBPAGE_GOFORWARD 1
#define WEBPAGE_GOHOME 2
#define WEBPAGE_SEARCH 3
#define WEBPAGE_REFRESH 4
#define WEBPAGE_STOP 5
/******************************* DoPageAction() **************************
* Implements the functionality of a "Back". "Forward", "Home", "Search",
* "Refresh", or "Stop" button.
*
* hwnd = Handle to the window hosting the browser object.
* action = One of the following:
* 0 = Move back to the previously viewed web page.
* 1 = Move forward to the previously viewed web page.
* 2 = Move to the home page.
* 3 = Search.
* 4 = Refresh the page.
* 5 = Stop the currently loading page.
*
* NOTE: EmbedBrowserObject() must have been successfully called once with the
* specified window, prior to calling this function. You need call
* EmbedBrowserObject() once only, and then you can make multiple calls to
* this function to display numerous pages in the specified window.
*/
static void DoPageAction(HWND hwnd, DWORD action)
{
IWebBrowser2 *webBrowser2;
IOleObject *browserObject;
// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
// we initially attached the browser object to this window.
browserObject = *((IOleObject **)GetWindowLong(hwnd, GWL_USERDATA));
// We want to get the base address (ie, a pointer) to the IWebBrowser2 object embedded within the browser
// object, so we can call some of the functions in the former's table.
if (!browserObject->lpVtbl->QueryInterface(browserObject, &IID_IWebBrowser2, (void**)&webBrowser2))
{
// Ok, now the pointer to our IWebBrowser2 object is in 'webBrowser2', and so its VTable is
// webBrowser2->lpVtbl.
// Call the desired function
switch (action)
{
case WEBPAGE_GOBACK:
{
// Call the IWebBrowser2 object's GoBack function.
webBrowser2->lpVtbl->GoBack(webBrowser2);
break;
}
case WEBPAGE_GOFORWARD:
{
// Call the IWebBrowser2 object's GoForward function.
webBrowser2->lpVtbl->GoForward(webBrowser2);
break;
}
case WEBPAGE_GOHOME:
{
// Call the IWebBrowser2 object's GoHome function.
webBrowser2->lpVtbl->GoHome(webBrowser2);
break;
}
case WEBPAGE_SEARCH:
{
// Call the IWebBrowser2 object's GoSearch function.
webBrowser2->lpVtbl->GoSearch(webBrowser2);
break;
}
case WEBPAGE_REFRESH:
{
// Call the IWebBrowser2 object's Refresh function.
webBrowser2->lpVtbl->Refresh(webBrowser2);
}
case WEBPAGE_STOP:
{
// Call the IWebBrowser2 object's Stop function.
webBrowser2->lpVtbl->Stop(webBrowser2);
}
}
// Release the IWebBrowser2 object.
webBrowser2->lpVtbl->Release(webBrowser2);
}
}
/******************************* DisplayHTMLStr() ****************************
* Takes a string containing some HTML BODY, and displays it in the specified
* window. For example, perhaps you want to display the HTML text of...
*
*
This is a picture.
*
* hwnd = Handle to the window hosting the browser object.
* string = Pointer to nul-terminated string containing the HTML BODY.
* (NOTE: No
tags are required in the string).*
* RETURNS: 0 if success, or non-zero if an error.
*
* NOTE: EmbedBrowserObject() must have been successfully called once with the
* specified window, prior to calling this function. You need call
* EmbedBrowserObject() once only, and then you can make multiple calls to
* this function to display numerous pages in the specified window.
*/
static long DisplayHTMLStr(HWND hwnd, LPCTSTR string)
{
IWebBrowser2 *webBrowser2;
LPDISPATCH lpDispatch;
IHTMLDocument2 *htmlDoc2;
IOleObject *browserObject;
SAFEARRAY *sfArray;
VARIANT myURL;
VARIANT *pVar;
BSTR bstr;
// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
// we initially attached the browser object to this window.
browserObject = *((IOleObject **)GetWindowLong(hwnd, GWL_USERDATA));
// Assume an error.
bstr = 0;
// We want to get the base address (ie, a pointer) to the IWebBrowser2 object embedded within the browser
// object, so we can call some of the functions in the former's table.
if (!browserObject->lpVtbl->QueryInterface(browserObject, &IID_IWebBrowser2, (void**)&webBrowser2))
{
// Ok, now the pointer to our IWebBrowser2 object is in 'webBrowser2', and so its VTable is
// webBrowser2->lpVtbl.
// Before we can get_Document(), we actually need to have some HTML page loaded in the browser. So,
// let's load an empty HTML page. Then, once we have that empty page, we can get_Document() and
// write() to stuff our HTML string into it.
VariantInit(&myURL);
myURL.vt = VT_BSTR;
myURL.bstrVal = SysAllocString(L"about:blank");
// Call the Navigate2() function to actually display the page.
webBrowser2->lpVtbl->Navigate2(webBrowser2, &myURL, 0, 0, 0, 0);
// Free any resources (including the BSTR).
VariantClear(&myURL);
// Call the IWebBrowser2 object's get_Document so we can get its DISPATCH object. I don't know why you
// don't get the DISPATCH object via the browser object's QueryInterface(), but you don't.
if (!webBrowser2->lpVtbl->get_Document(webBrowser2, &lpDispatch))
{
// We want to get a pointer to the IHTMLDocument2 object embedded within the DISPATCH
// object, so we can call some of the functions in the former's table.
if (!lpDispatch->lpVtbl->QueryInterface(lpDispatch, &IID_IHTMLDocument2, (void**)&htmlDoc2))
{
// Ok, now the pointer to our IHTMLDocument2 object is in 'htmlDoc2', and so its VTable is
// htmlDoc2->lpVtbl.
// Our HTML must be in the form of a BSTR. And it must be passed to write() in an
// array of "VARIENT" structs. So let's create all that.
if ((sfArray = SafeArrayCreate(VT_VARIANT, 1, (SAFEARRAYBOUND *)&ArrayBound)))
{
if (!SafeArrayAccessData(sfArray, (void**)&pVar))
{
pVar->vt = VT_BSTR;
#ifndef UNICODE
{
wchar_t *buffer;
DWORD size;
size = MultiByteToWideChar(CP_ACP, 0, string, -1, 0, 0);
if (!(buffer = (wchar_t *)GlobalAlloc(GMEM_FIXED, sizeof(wchar_t) * size))) goto bad;
MultiByteToWideChar(CP_ACP, 0, string, -1, buffer, size);
bstr = SysAllocString(buffer);
GlobalFree(buffer);
}
#else
bstr = SysAllocString(string);
#endif
// Store our BSTR pointer in the VARIENT.
if ((pVar->bstrVal = bstr))
{
// Pass the VARIENT with its BSTR to write() in order to shove our desired HTML string
// into the body of that empty page we created above.
htmlDoc2->lpVtbl->write(htmlDoc2, sfArray);
// Close the document. If we don't do this, subsequent calls to DisplayHTMLStr
// would append to the current contents of the page
htmlDoc2->lpVtbl->close(htmlDoc2);
// Normally, we'd need to free our BSTR, but SafeArrayDestroy() does it for us
// SysFreeString(bstr);
}
}
// Free the array. This also frees the VARIENT that SafeArrayAccessData created for us,
// and even frees the BSTR we allocated with SysAllocString
SafeArrayDestroy(sfArray);
}
// Release the IHTMLDocument2 object.
bad:
htmlDoc2->lpVtbl->Release(htmlDoc2);
}
// Release the DISPATCH object.
lpDispatch->lpVtbl->Release(lpDispatch);
}
// Release the IWebBrowser2 object.
webBrowser2->lpVtbl->Release(webBrowser2);
}
// No error?
if (bstr) return(0);
// An error
return(-1);
}
/******************************* DisplayHTMLPage() ****************************
* Displays a URL, or HTML file on disk.
*
* hwnd = Handle to the window hosting the browser object.
* webPageName = Pointer to nul-terminated name of the URL/file.
*
* RETURNS: 0 if success, or non-zero if an error.
*
* NOTE: EmbedBrowserObject() must have been successfully called once with the
* specified window, prior to calling this function. You need call
* EmbedBrowserObject() once only, and then you can make multiple calls to
* this function to display numerous pages in the specified window.
*/
static long DisplayHTMLPage(HWND hwnd, LPCTSTR webPageName)
{
IWebBrowser2 *webBrowser2;
VARIANT myURL;
IOleObject *browserObject;
// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
// we initially attached the browser object to this window.
browserObject = *((IOleObject **)GetWindowLong(hwnd, GWL_USERDATA));
// We want to get the base address (ie, a pointer) to the IWebBrowser2 object embedded within the browser
// object, so we can call some of the functions in the former's table.
if (!browserObject->lpVtbl->QueryInterface(browserObject, &IID_IWebBrowser2, (void**)&webBrowser2))
{
// Ok, now the pointer to our IWebBrowser2 object is in 'webBrowser2', and so its VTable is
// webBrowser2->lpVtbl.
// Our URL (ie, web address, such as "http://www.microsoft.com" or an HTM filename on disk
// such as "c:\myfile.htm") must be passed to the IWebBrowser2's Navigate2() function as a BSTR.
// A BSTR is like a pascal version of a double-byte character string. In other words, the
// first unsigned short is a count of how many characters are in the string, and then this
// is followed by those characters, each expressed as an unsigned short (rather than a
// char). The string is not nul-terminated. The OS function SysAllocString can allocate and
// copy a UNICODE C string to a BSTR. Of course, we'll need to free that BSTR after we're done
// with it. If we're not using UNICODE, we first have to convert to a UNICODE string.
//
// What's more, our BSTR needs to be stuffed into a VARIENT struct, and that VARIENT struct is
// then passed to Navigate2(). Why? The VARIENT struct makes it possible to define generic
// 'datatypes' that can be used with all languages. Not all languages support things like
// nul-terminated C strings. So, by using a VARIENT, whose first field tells what sort of
// data (ie, string, float, etc) is in the VARIENT, COM interfaces can be used by just about
// any language.
VariantInit(&myURL);
myURL.vt = VT_BSTR;
#ifndef UNICODE
{
wchar_t *buffer;
DWORD size;
size = MultiByteToWideChar(CP_ACP, 0, webPageName, -1, 0, 0);
if (!(buffer = (wchar_t *)GlobalAlloc(GMEM_FIXED, sizeof(wchar_t) * size))) goto badalloc;
MultiByteToWideChar(CP_ACP, 0, webPageName, -1, buffer, size);
myURL.bstrVal = SysAllocString(buffer);
GlobalFree(buffer);
}
#else
myURL.bstrVal = SysAllocString(webPageName);
#endif
if (!myURL.bstrVal)
{
badalloc:
webBrowser2->lpVtbl->Release(webBrowser2);
return(-6);
}
// Call the Navigate2() function to actually display the page.
webBrowser2->lpVtbl->Navigate2(webBrowser2, &myURL, 0, 0, 0, 0);
// Free any resources (including the BSTR we allocated above).
VariantClear(&myURL);
// We no longer need the IWebBrowser2 object (ie, we don't plan to call any more functions in it,
// so we can release our hold on it). Note that we'll still maintain our hold on the browser
// object.
webBrowser2->lpVtbl->Release(webBrowser2);
// Success
return(0);
}
return(-5);
}
/******************************* ResizeBrowser() ****************************
* Resizes the browser object for the specified window to the specified
* width and height.
*
* hwnd = Handle to the window hosting the browser object.
* width = Width.
* height = Height.
*
* NOTE: EmbedBrowserObject() must have been successfully called once with the
* specified window, prior to calling this function. You need call
* EmbedBrowserObject() once only, and then you can make multiple calls to
* this function to resize the browser object.
*/
static void ResizeBrowser(HWND hwnd, DWORD width, DWORD height)
{
IWebBrowser2 *webBrowser2;
IOleObject *browserObject;
// Retrieve the browser object's pointer we stored in our window's GWL_USERDATA when
// we initially attached the browser object to this window.
browserObject = *((IOleObject **)GetWindowLong(hwnd, GWL_USERDATA));
// We want to get the base address (ie, a pointer) to the IWebBrowser2 object embedded within the browser
// object, so we can call some of the functions in the former's table.
if (!browserObject->lpVtbl->QueryInterface(browserObject, &IID_IWebBrowser2, (void**)&webBrowser2))
{
// Ok, now the pointer to our IWebBrowser2 object is in 'webBrowser2', and so its VTable is
// webBrowser2->lpVtbl.
// Call are put_Width() and put_Height() to set the new width/height.
webBrowser2->lpVtbl->put_Height(webBrowser2, height);
webBrowser2->lpVtbl->put_Width(webBrowser2, width);
// We no longer need the IWebBrowser2 object (ie, we don't plan to call any more functions in it,
// so we can release our hold on it). Note that we'll still maintain our hold on the browser
// object.
webBrowser2->lpVtbl->Release(webBrowser2);
}
}
/***************************** EmbedBrowserObject() **************************
* Puts the browser object inside our host window, and save a pointer to this
* window's browser object in the window's GWL_USERDATA field.
*
* hwnd = Handle of our window into which we embed the browser object.
*
* RETURNS: 0 if success, or non-zero if an error.
*
* NOTE: We tell the browser object to occupy the entire client area of the
* window.
*
* NOTE: No HTML page will be displayed here. We can do that with a subsequent
* call to either DisplayHTMLPage() or DisplayHTMLStr(). This is merely once-only
* initialization for using the browser object. In a nutshell, what we do
* here is get a pointer to the browser object in our window's GWL_USERDATA
* so we can access that object's functions whenever we want, and we also pass
* the browser a pointer to our IOleClientSite struct so that the browser can
* call our functions in our struct's VTable.
*/
static long EmbedBrowserObject(HWND hwnd)
{
LPCLASSFACTORY pClassFactory;
IOleObject *browserObject;
IWebBrowser2 *webBrowser2;
RECT rect;
char *ptr;
_IOleClientSiteEx *_iOleClientSiteEx;
// Our IOleClientSite, IOleInPlaceSite, and IOleInPlaceFrame functions need to get our window handle. We
// could store that in some global. But then, that would mean that our functions would work with only that
// one window. If we want to create multiple windows, each hosting its own browser object (to display its
// own web page), then we need to create unique IOleClientSite, IOleInPlaceSite, and IOleInPlaceFrame
// structs for each window. And we'll put an extra field at the end of those structs to store our extra
// data such as a window handle. So, our functions won't have to touch global data, and can therefore be
// re-entrant and work with multiple objects/windows.
//
// Remember that a pointer to our IOleClientSite we create here will be passed as the first arg to every
// one of our IOleClientSite functions. Ditto with the IOleInPlaceFrame object we create here, and the
// IOleInPlaceFrame functions. So, our functions are able to retrieve the window handle we'll store here,
// and then, they'll work with all such windows containing a browser control.
//
// Furthermore, since the browser will be calling our IOleClientSite's QueryInterface to get a pointer to
// our IOleInPlaceSite and IDocHostUIHandler objects, that means that our IOleClientSite QueryInterface
// must have an easy way to grab those pointers. Probably the easiest thing to do is just embed our
// IOleInPlaceSite and IDocHostUIHandler objects inside of an extended IOleClientSite which we'll call
// a _IOleClientSiteEx. As long as they come after the pointer to the IOleClientSite VTable, then we're
// ok.
//
// Of course, we need to GlobalAlloc the above structs now. We'll just get all 4 with a single call to
// GlobalAlloc, especially since 3 of them are all contained inside of our _IOleClientSiteEx anyway.
//
// So, we're not actually allocating separate IOleClientSite, IOleInPlaceSite, IOleInPlaceFrame and
// IDocHostUIHandler structs.
//
// One final thing. We're going to allocate extra room to store the pointer to the browser object.
if (!(ptr = (char *)GlobalAlloc(GMEM_FIXED, sizeof(_IOleClientSiteEx) + sizeof(IOleObject *))))
return(-1);
// Initialize our IOleClientSite object with a pointer to our IOleClientSite VTable.
_iOleClientSiteEx = (_IOleClientSiteEx *)(ptr + sizeof(IOleObject *));
_iOleClientSiteEx->client.lpVtbl = &MyIOleClientSiteTable;
// Initialize our IOleInPlaceSite object with a pointer to our IOleInPlaceSite VTable.
_iOleClientSiteEx->inplace.inplace.lpVtbl = &MyIOleInPlaceSiteTable;
// Initialize our IOleInPlaceFrame object with a pointer to our IOleInPlaceFrame VTable.
_iOleClientSiteEx->inplace.frame.frame.lpVtbl = &MyIOleInPlaceFrameTable;
// Save our HWND (in the IOleInPlaceFrame object) so our IOleInPlaceFrame functions can retrieve it.
_iOleClientSiteEx->inplace.frame.window = hwnd;
// Initialize our IDocHostUIHandler object with a pointer to our IDocHostUIHandler VTable.
_iOleClientSiteEx->ui.ui.lpVtbl = &MyIDocHostUIHandlerTable;
// Get a pointer to the browser object and lock it down (so it doesn't "disappear" while we're using
// it in this program). We do this by calling the OS function CoGetClassObject().
//
// NOTE: We need this pointer to interact with and control the browser. With normal WIN32 controls such as a
// Static, Edit, Combobox, etc, you obtain an HWND and send messages to it with SendMessage(). Not so with
// the browser object. You need to get a pointer to its "base structure" (as returned by CoGetClassObject()). This
// structure contains an array of pointers to functions you can call within the browser object. Actually, the
// base structure contains a 'lpVtbl' field that is a pointer to that array. We'll call the array a 'VTable'.
//
// For example, the browser object happens to have a SetHostNames() function we want to call. So, after we
// retrieve the pointer to the browser object (in a local we'll name 'browserObject'), then we can call that
// function, and pass it args, as so:
//
// browserObject->lpVtbl->SetHostNames(browserObject, SomeString, SomeString);
//
// There's our pointer to the browser object in 'browserObject'. And there's the pointer to the browser object's
// VTable in 'browserObject->lpVtbl'. And the pointer to the SetHostNames function happens to be stored in an
// field named 'SetHostNames' within the VTable. So we are actually indirectly calling SetHostNames by using
// a pointer to it. That's how you use a VTable.
//
// NOTE: We pass our _IOleClientSiteEx struct and lie -- saying that it's a IOleClientSite. It's ok. A
// _IOleClientSiteEx struct starts with an embedded IOleClientSite. So the browser won't care, and we want
// this extended struct passed to our IOleClientSite functions.
// Get a pointer to the browser object's IClassFactory object via CoGetClassObject()
pClassFactory = 0;
if (!CoGetClassObject(&CLSID_WebBrowser, CLSCTX_INPROC_SERVER | CLSCTX_INPROC_HANDLER, NULL, &IID_IClassFactory, (void **)&pClassFactory) && pClassFactory)
{
// Call the IClassFactory's CreateInstance() to create a browser object
if (!pClassFactory->lpVtbl->CreateInstance(pClassFactory, 0, &IID_IOleObject, &browserObject))
{
// Free the IClassFactory. We need it only to create a browser object instance
pClassFactory->lpVtbl->Release(pClassFactory);
// Ok, we now have the pointer to the browser object in 'browserObject'. Let's save this in the
// memory block we allocated above, and then save the pointer to that whole thing in our window's
// USERDATA field. That way, if we need multiple windows each hosting its own browser object, we can
// call EmbedBrowserObject() for each one, and easily associate the appropriate browser object with
// its matching window and its own objects containing per-window data.
*((IOleObject **)ptr) = browserObject;
SetWindowLong(hwnd, GWL_USERDATA, (LONG)ptr);
// Give the browser a pointer to my IOleClientSite object
if (!browserObject->lpVtbl->SetClientSite(browserObject, (IOleClientSite *)_iOleClientSiteEx))
{
// We can now call the browser object's SetHostNames function. SetHostNames lets the browser object know our
// application's name and the name of the document in which we're embedding the browser. (Since we have no
// document name, we'll pass a 0 for the latter). When the browser object is opened for editing, it displays
// these names in its titlebar.
//
// We are passing 3 args to SetHostNames. You'll note that the first arg to SetHostNames is the base
// address of our browser control. This is something that you always have to remember when working in C
// (as opposed to C++). When calling a VTable function, the first arg to that function must always be the
// structure which contains the VTable. (In this case, that's the browser control itself). Why? That's
// because that function is always assumed to be written in C++. And the first argument to any C++ function
// must be its 'this' pointer (ie, the base address of its class, which in this case is our browser object
// pointer). In C++, you don't have to pass this first arg, because the C++ compiler is smart enough to
// produce an executable that always adds this first arg. In fact, the C++ compiler is smart enough to
// know to fetch the function pointer from the VTable, so you don't even need to reference that. In other
// words, the C++ equivalent code would be:
//
// browserObject->SetHostNames(L"My Host Name", 0);
//
// So, when you're trying to convert C++ code to C, always remember to add this first arg whenever you're
// dealing with a VTable (ie, the field is usually named 'lpVtbl') in the standard objects, and also add
// the reference to the VTable itself.
//
// Oh yeah, the L is because we need UNICODE strings. And BTW, the host and document names can be anything
// you want.
browserObject->lpVtbl->SetHostNames(browserObject, L"My Host Name", 0);
GetClientRect(hwnd, &rect);
// Let browser object know that it is embedded in an OLE container.
if (!OleSetContainedObject((struct IUnknown *)browserObject, TRUE) &&
// Set the display area of our browser control the same as our window's size
// and actually put the browser object into our window.
!browserObject->lpVtbl->DoVerb(browserObject, OLEIVERB_SHOW, NULL, (IOleClientSite *)_iOleClientSiteEx, -1, hwnd, &rect) &&
// Ok, now things may seem to get even trickier, One of those function pointers in the browser's VTable is
// to the QueryInterface() function. What does this function do? It lets us grab the base address of any
// other object that may be embedded within the browser object. And this other object has its own VTable
// containing pointers to more functions we can call for that object.
//
// We want to get the base address (ie, a pointer) to the IWebBrowser2 object embedded within the browser
// object, so we can call some of the functions in the former's table. For example, one IWebBrowser2 function
// we intend to call below will be Navigate2(). So we call the browser object's QueryInterface to get our
// pointer to the IWebBrowser2 object.
!browserObject->lpVtbl->QueryInterface(browserObject, &IID_IWebBrowser2, (void**)&webBrowser2))
{
// Ok, now the pointer to our IWebBrowser2 object is in 'webBrowser2', and so its VTable is
// webBrowser2->lpVtbl.
// Let's call several functions in the IWebBrowser2 object to position the browser display area
// in our window. The functions we call are put_Left(), put_Top(), put_Width(), and put_Height().
// Note that we reference the IWebBrowser2 object's VTable to get pointers to those functions. And
// also note that the first arg we pass to each is the pointer to the IWebBrowser2 object.
webBrowser2->lpVtbl->put_Left(webBrowser2, 0);
webBrowser2->lpVtbl->put_Top(webBrowser2, 0);
webBrowser2->lpVtbl->put_Width(webBrowser2, rect.right);
webBrowser2->lpVtbl->put_Height(webBrowser2, rect.bottom);
// We no longer need the IWebBrowser2 object (ie, we don't plan to call any more functions in it
// right now, so we can release our hold on it). Note that we'll still maintain our hold on the
// browser object until we're done with that object.
webBrowser2->lpVtbl->Release(webBrowser2);
// Success
return(0);
}
}
// Something went wrong setting up the browser!
UnEmbedBrowserObject(hwnd);
return(-4);
}
pClassFactory->lpVtbl->Release(pClassFactory);
GlobalFree(ptr);
// Can't create an instance of the browser!
return(-3);
}
GlobalFree(ptr);
// Can't get the web browser's IClassFactory!
return(-2);
}
/****************************** WindowProc() ***************************
* Our message handler for our window to host the browser.
*/
static LRESULT CALLBACK MainProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_SIZE:
{
// Resize the browser object to fit the window
ResizeBrowser(hwnd, LOWORD(lParam), HIWORD(lParam));
return(0);
}
case WM_CREATE:
{
// Embed the browser object into our host window. We need do this only
// once. Note that the browser object will start calling some of our
// IOleInPlaceFrame and IOleClientSite functions as soon as we start
// calling browser object functions in EmbedBrowserObject().
if (EmbedBrowserObject(hwnd)) return(-1);
// Success
return(0);
}
case WM_DESTROY:
{
// Detach the browser object from this window, and free resources.
UnEmbedBrowserObject(hwnd);
return(TRUE);
}
}
return(DefWindowProc(hwnd, uMsg, wParam, lParam));
}
HWND create_htmPage (HINSTANCE hInst, HWND hOwner, const WCHAR* htmFile)
{
WNDCLASSEX wc;
HWND hPage = 0;
ZeroMemory (&wc, sizeof(WNDCLASSEX));
wc.cbSize = sizeof(WNDCLASSEX);
wc.hInstance = hInst;
wc.lpfnWndProc = MainProc;
wc.lpszClassName = &ClassName[0];
RegisterClassEx(&wc);
hPage = CreateWindowEx (
WS_EX_CLIENTEDGE, &ClassName[0], NULL, WS_CHILD,
0, 0, 0, 0, hOwner, NULL, hInst, 0);
DisplayHTMLPage (hPage, htmFile);
ShowWindow (hPage, SW_SHOW);
UpdateWindow (hPage);
return hPage;
}