数CRichEditCtrl的先天不足及进化方法
不能够自动初始化 当我第一次将Rich Edit控件放在资源窗体上的时候，发现程序根本就不能运行。后来才找到原因，原来Rich Edit 控件是Ole类型的控件。在加载Rich Edit 控件的时候，必须进行初始化。代码如下： ..... } 不能够接受TAB键 将 RichEdit控件放到资源窗体上的时候，发现它的属性页中并没有设置接受TAB键的设置，导致当把焦点放到Rich Edit 控件上的时候，一按tab键，焦点就移动到下一个控件上面去了。 return DLGC_WANTTAB;
不能够通过属性设置自动换行 当把Rich Edit控件放到资源窗体上的时候，发现在它的属性窗体中并没有设置Rich Edit控件自动换行的属性设置。要达到这一目的，例子代码如下： ............. } 不能显示图片等其他OLE对象 MFC提供的CRichEditCtrl没有提供直接显示图片等OLE对象的属性或方法设置，但是提供了一个接口SetOLECallback( IRichEditOleCallback* pCallback ); public: virtual HRESULT STDMETHODCALLTYPE GetNewStorage(LPSTORAGE* lplpstg); }
实际上，CRichEditCtrl本身是支持Ctrl+C实现拷贝功能的，但是当我在CRichiEditCtrl的继承类中使用了IRichiEditCallback接口后，它就不在支持Ctrl+C实现拷贝功能了。我想问题就出在IRichEditCallback接口上。 附录
#if
!defined(AFX_OLERICHEDITCTRL_H__3DFF15EE_7336_4297_9620_7F00B611DAA1__INCLUDED_)
#define AFX_OLERICHEDITCTRL_H__3DFF15EE_7336_4297_9620_7F00B611DAA1__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 // OleRichEditCtrl.h : header file // ＃i nclude < richole.h > /////////////////////////////////////////////////////////////////////////// // // COleRichEditCtrl window class COleRichEditCtrl : public CRichEditCtrl { // Construction public : COleRichEditCtrl(); virtual ~ COleRichEditCtrl(); long StreamInFromResource( int iRes, LPCTSTR sType); protected : static DWORD CALLBACK readFunction(DWORD dwCookie, LPBYTE lpBuf, // the buffer to fill LONG nCount, // number of bytes to read LONG * nRead); // number of bytes actually read interface IExRichEditOleCallback; // forward declaration (see below in this header file) IExRichEditOleCallback * m_pIRichEditOleCallback; BOOL m_bCallbackSet; interface IExRichEditOleCallback : public IRichEditOleCallback { public : IExRichEditOleCallback(); virtual ~ IExRichEditOleCallback(); int m_iNumStorages; IStorage * pStorage; DWORD m_dwRef; virtual HRESULT STDMETHODCALLTYPE GetNewStorage(LPSTORAGE * lplpstg); virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void ** ppvObject); virtual ULONG STDMETHODCALLTYPE AddRef(); virtual ULONG STDMETHODCALLTYPE Release(); virtual HRESULT STDMETHODCALLTYPE GetInPlaceContext(LPOLEINPLACEFRAME FAR * lplpFrame, LPOLEINPLACEUIWINDOW FAR * lplpDoc, LPOLEINPLACEFRAMEINFO lpFrameInfo); virtual HRESULT STDMETHODCALLTYPE ShowContainerUI(BOOL fShow); virtual HRESULT STDMETHODCALLTYPE QueryInsertObject(LPCLSID lpclsid, LPSTORAGE lpstg, LONG cp); virtual HRESULT STDMETHODCALLTYPE DeleteObject(LPOLEOBJECT lpoleobj); virtual HRESULT STDMETHODCALLTYPE QueryAcceptData(LPDATAOBJECT lpdataobj, CLIPFORMAT FAR * lpcfFormat, DWORD reco, BOOL fReally, HGLOBAL hMetaPict); virtual HRESULT STDMETHODCALLTYPE ContextSensitiveHelp(BOOL fEnterMode); virtual HRESULT STDMETHODCALLTYPE GetClipboardData(CHARRANGE FAR * lpchrg, DWORD reco, LPDATAOBJECT FAR * lplpdataobj); virtual HRESULT STDMETHODCALLTYPE GetDragDropEffect(BOOL fDrag, DWORD grfKeyState, LPDWORD pdwEffect); virtual HRESULT STDMETHODCALLTYPE GetContextMenu(WORD seltyp, LPOLEOBJECT lpoleobj, CHARRANGE FAR * lpchrg, HMENU FAR * lphmenu); }; public : // Overrides // ClassWizard generated virtual function overrides // {{AFX_VIRTUAL(COleRichEditCtrl) protected : virtual void PreSubclassWindow(); // }}AFX_VIRTUAL // Implementation public : // Generated message map functions protected : // {{AFX_MSG(COleRichEditCtrl) afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct); // }}AFX_MSG afx_msg UINT OnGetDlgCode( ); DECLARE_MESSAGE_MAP() }; /////////////////////////////////////////////////////////////////////////// // // {{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line. #endif // !defined(AFX_OLERICHEDITCTRL_H__3DFF15EE_7336_4297_9620_7F00B611DAA1__INCLUDED_)
//
OleRichEditCtrl.cpp : implementation file // ＃i nclude " stdafx.h " ＃i nclude " OleRichEditCtrl.h " #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif /////////////////////////////////////////////////////////////////////////// // // COleRichEditCtrl COleRichEditCtrl::COleRichEditCtrl() { m_bCallbackSet = FALSE; } COleRichEditCtrl:: ~ COleRichEditCtrl() { // IExRichEditOleCallback class is a reference-counted class // which deletes itself and for which delete should not be called // delete m_pIRichEditOleCallback; } BEGIN_MESSAGE_MAP(COleRichEditCtrl, CRichEditCtrl) // {{AFX_MSG_MAP(COleRichEditCtrl) ON_WM_CREATE() // }}AFX_MSG_MAP ON_WM_GETDLGCODE( ) END_MESSAGE_MAP() // int COleRichEditCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CRichEditCtrl::OnCreate(lpCreateStruct) == - 1 ) return - 1 ; // m_pIRichEditOleCallback should have been created in PreSubclassWindow ASSERT( m_pIRichEditOleCallback != NULL ); // set the IExRichEditOleCallback pointer if it wasn't set // successfully in PreSubclassWindow if ( ! m_bCallbackSet ) { SetOLECallback( m_pIRichEditOleCallback ); } return 0 ; } void COleRichEditCtrl::PreSubclassWindow() { // base class first CRichEditCtrl::PreSubclassWindow(); m_pIRichEditOleCallback = NULL; m_pIRichEditOleCallback = new IExRichEditOleCallback; ASSERT( m_pIRichEditOleCallback != NULL ); m_bCallbackSet = SetOLECallback( m_pIRichEditOleCallback ); } long COleRichEditCtrl::StreamInFromResource( int iRes, LPCTSTR sType) { HINSTANCE hInst = AfxGetInstanceHandle(); HRSRC hRsrc = ::FindResource(hInst, MAKEINTRESOURCE(iRes), sType); DWORD len = SizeofResource(hInst, hRsrc); BYTE * lpRsrc = (BYTE * )LoadResource(hInst, hRsrc); ASSERT(lpRsrc); CMemFile mfile; mfile.Attach(lpRsrc, len); EDITSTREAM es; es.pfnCallback = readFunction; es.dwError = 0 ; es.dwCookie = (DWORD) & mfile; return StreamIn( SF_RTF, es ); }
/*
static
*/
DWORD CALLBACK COleRichEditCtrl::readFunction(DWORD dwCookie, LPBYTE lpBuf, // the buffer to fill LONG nCount, // number of bytes to read LONG * nRead) // number of bytes actually read { CFile * fp = (CFile * )dwCookie; * nRead = fp -> Read(lpBuf,nCount); return 0 ; } /////////////////////////////////////////////////////////////////////////// //
COleRichEditCtrl::IExRichEditOleCallback::IExRichEditOleCallback() { pStorage = NULL; m_iNumStorages = 0 ; m_dwRef = 0 ; // set up OLE storage HRESULT hResult = ::StgCreateDocfile(NULL, STGM_TRANSACTED | STGM_READWRITE | STGM_SHARE_EXCLUSIVE /* | STGM_DELETEONRELEASE */ | STGM_CREATE , 0 , & pStorage ); if ( pStorage == NULL || hResult != S_OK ) { AfxThrowOleException( hResult ); } } COleRichEditCtrl::IExRichEditOleCallback:: ~ IExRichEditOleCallback() { }
HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::GetNewStorage(LPSTORAGE * lplpstg) { m_iNumStorages ++ ; WCHAR tName[ 50 ]; swprintf(tName, L " REOLEStorage%d " , m_iNumStorages); HRESULT hResult = pStorage -> CreateStorage(tName, STGM_TRANSACTED | STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_CREATE , 0 , 0 , lplpstg ); if (hResult != S_OK ) { ::AfxThrowOleException( hResult ); } return hResult; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::QueryInterface(REFIID iid, void ** ppvObject) { HRESULT hr = S_OK; * ppvObject = NULL; if ( iid == IID_IUnknown || iid == IID_IRichEditOleCallback ) { * ppvObject = this ; AddRef(); hr = NOERROR; } else { hr = E_NOINTERFACE; } return hr; } ULONG STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::AddRef() { return ++ m_dwRef; }
ULONG STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::Release() { if ( -- m_dwRef == 0 ) { delete this ; return 0 ; } return m_dwRef; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::GetInPlaceContext(LPOLEINPLACEFRAME FAR * lplpFrame, LPOLEINPLACEUIWINDOW FAR * lplpDoc, LPOLEINPLACEFRAMEINFO lpFrameInfo) { return S_OK; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::ShowContainerUI(BOOL fShow) { return S_OK; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::QueryInsertObject(LPCLSID lpclsid, LPSTORAGE lpstg, LONG cp) { return S_OK; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::DeleteObject(LPOLEOBJECT lpoleobj) { return S_OK; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::QueryAcceptData(LPDATAOBJECT lpdataobj, CLIPFORMAT FAR * lpcfFormat, DWORD reco, BOOL fReally, HGLOBAL hMetaPict) { return S_OK; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::ContextSensitiveHelp(BOOL fEnterMode) { return S_OK; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::GetClipboardData(CHARRANGE FAR * lpchrg, DWORD reco, LPDATAOBJECT FAR * lplpdataobj) { return E_NOTIMPL; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::GetDragDropEffect(BOOL fDrag, DWORD grfKeyState, LPDWORD pdwEffect) { return S_OK; } HRESULT STDMETHODCALLTYPE COleRichEditCtrl::IExRichEditOleCallback::GetContextMenu(WORD seltyp, LPOLEOBJECT lpoleobj, CHARRANGE FAR * lpchrg, HMENU FAR * lphmenu) { return S_OK; } // TabRichEditCtrl 消息处理程序 UINT COleRichEditCtrl::OnGetDlgCode( ){ return DLGC_WANTTAB; } |
