mfc 显示html文本,CHtmlCtrl类,继承CHtmlView,直接显示html文本

vckbase上看到的，但调试老出错，总结一下

代码在vs2010下test通过

功能如下：

可以用于对话框和其它窗口

SetCmdMap 用于设置“app:command”链接的命令映射。.

SetHTML 用于将字符串转换为 HTML 文档。

SetHideContextMenu隐藏菜单

CreateFromStatic关联到一个CStatic

要用的头

#include

#include

用法

m_wndPic.InitImage(&m_Pic);

nObjOutputHTML.SetHideContextMenu(TRUE);

nObjOutputHTML.CreateFromStatic(IDC_STATIC_SS,this);

nObjOutputHTML.Navigate(_T("about:blank")); nObjOutputHTML.SetHTML(m_Text);

存在的问题

IsIEWindow和OnBeforeNavigate2字符集的问题

OnDestroy中m_pBrowserApp没有销毁，用Quit?

如果不Navigate(_T("about:blank")); 就不能SetHTML

头文件如下：

#pragma once

#ifdef _WIN32_WCE

#error "CHtmlView is not supported for Windows CE."

#endif

// 该结构在命令映射中定义一个入口，这个映射将文本串映射到命令IDs，

// 如果命令映射中有一个映射到 ID_APP_ABOUT 的入口 “about”，并且

// HTML 有一个链接锚 ,那么单击该链接时将执行

struct HTMLCMDMAP{LPCTSTR name;int nID;};// command name used in

"app:name" HREF in

//这个类将 CHtmlView 转换为普通的能在对话框和框架中使用的控制

class CHtmlCtrl : public CHtmlView

{

DECLARE_DYNCREATE(CHtmlCtrl)

public:

CHtmlCtrl():m_bHideMenu(FALSE),

m_cmdmap(NULL){}; // protected constructor used by dynamic creation

virtual ~CHtmlCtrl(){};

HTMLCMDMAP* m_cmdmap;//

command map

BOOL m_bHideMenu;// hide context menu

// get/set HideContextMenu property

BOOL GetHideContextMenu(){ return m_bHideMenu;

}

void SetHideContextMenu(BOOL val){

m_bHideMenu=val; }

// Set doc contents from string

HRESULT SetHTML(LPCTSTR strHTML);

// set command map

void SetCmdMap(HTMLCMDMAP* val){ m_cmdmap = val;

}

// create control in same place as static

control

BOOL CreateFromStatic(UINT nID, CWnd*

pParent);

// create control from scratch

BOOL Create(const RECT& rc, CWnd*

pParent, UINT nID,DWORD dwStyle =

WS_CHILD|WS_VISIBLE,CCreateContext* pContext = NULL)

{

return CHtmlView::Create(NULL,

NULL, dwStyle, rc, pParent,nID, pContext);

}

// 重写该函数可以截获子窗口消息，从而禁用上下文菜单。

virtual BOOL PreTranslateMessage(MSG*

pMsg);

// 通常，CHtmlView 自己是在 PostNcDestroy

销毁的，但对于一个界面控制来说

// 我们不想那样做，因为控制一般都是作为另一个窗口对象的成员实现的。

virtual void PostNcDestroy(){}

// 重写以便旁路掉对 MFC doc/view 框架的依赖，CHtmView

仅仅在这里依附于框架。

afx_msg void OnDestroy();

afx_msg int OnMouseActivate(CWnd* pDesktopWnd,

UINT nHitTest,UINT msg);

// 重写以便截获 "app:" 伪协议

virtual void OnBeforeNavigate2( LPCTSTR

lpszURL,DWORD nFlags,LPCTSTR

lpszTargetFrameName,CByteArray&

baPostedData,LPCTSTR lpszHeaders,BOOL* pbCancel );

// 你可以重写处理 "app:"

命令的代码。注意只是在不使用命令映射机制时才需要重写

virtual void OnAppCmd(LPCTSTR

lpszCmd);

DECLARE_MESSAGE_MAP();

};

实现文件

// CHtmlCtrl 实现 -- 控件中的 web 浏览器，只要改写 CHtmlVie

// 你就可以摆脱框架 - 从而将此控制用于对话框和其它任何窗口。

//

// 特性s:

// - SetCmdMap 用于设置“app:command”链接的命令映射。.

// - SetHTML 用于将字符串转换为 HTML 文档。.

#include "StdAfx.h"

#include "HtmlCtrl.h"

#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif

// macro to declare a typedef for ATL

smart poitners; eg SPIHTMLDocument2

#define DECLARE_SMARTPTR(ifacename) typedef

CComQIPtr

SP##ifacename;

// smart pointer to IHTMLDocument2

DECLARE_SMARTPTR(IHTMLDocument2)

// useful macro for checking

HRESULTs

#define HRCHECK(x) hr = x; if (!SUCCEEDED(hr)) { \

TRACE(_T("hr=%p\n"),hr);\

return hr;\

}

IMPLEMENT_DYNAMIC(CHtmlCtrl,

CHtmlView)

BEGIN_MESSAGE_MAP(CHtmlCtrl, CHtmlView)

ON_WM_DESTROY()

ON_WM_MOUSEACTIVATE()

END_MESSAGE_MAP()

//

// Create control in same position as an existing static control

with given

// the same ID (could be any kind of control, really)

//

BOOL CHtmlCtrl::CreateFromStatic(UINT nID, CWnd* pParent)

{

CStatic wndStatic;

if (!wndStatic.SubclassDlgItem(nID,

pParent))

return FALSE;

// Get static control

rect, convert to parent's client coords.

CRect rc;

wndStatic.GetWindowRect(&rc);

pParent->ScreenToClient(&rc);

wndStatic.DestroyWindow();

return Create(rc,

pParent, nID);

}

// Override to avoid CView stuff that assumes a frame.

//

void CHtmlCtrl::OnDestroy()

{

m_pBrowserApp = NULL; // will call Release

CWnd::OnDestroy(); // bypass

CView doc/frame stuff

}

// Override to avoid CView stuff that assumes a frame.

//

int CHtmlCtrl::OnMouseActivate(CWnd* pDesktopWnd, UINT nHitTest,

UINT msg)

{

// bypass CView doc/frame stuff

return CWnd::OnMouseActivate(pDesktopWnd,

nHitTest, msg);

}

// Return TRUE iff hwnd is internet

explorer window.

inline BOOL IsIEWindow(HWND hwnd)

{

static LPCSTR IEWNDCLASSNAME = "Internet

Explorer_Server";

char classname[32]; // always char, never

TCHAR

GetClassName(hwnd, (LPWSTR)classname,

sizeof(classname));

return strcmp(classname,

IEWNDCLASSNAME)==0;

}

//

// Override to trap "Internet Explorer_Server" window context menu

messages.

//

BOOL CHtmlCtrl::PreTranslateMessage(MSG* pMsg)

{

if (m_bHideMenu) {

switch

(pMsg->message) {

case WM_CONTEXTMENU:

case WM_RBUTTONUP:

case WM_RBUTTONDOWN:

case WM_RBUTTONDBLCLK:

if

(IsIEWindow(pMsg->hwnd)) {

if

(pMsg->message==WM_RBUTTONUP)

//

let parent handle context menu

GetParent()->SendMessage(WM_CONTEXTMENU,

pMsg->wParam, pMsg->lParam);

return

TRUE; // eat it

}

}

}

return

CHtmlView::PreTranslateMessage(pMsg);

}

//

// Override to pass "app:" links to virtual fn instead of

browser.

//

void CHtmlCtrl::OnBeforeNavigate2( LPCTSTR lpszURL,

DWORD nFlags, LPCTSTR lpszTargetFrameName,

CByteArray& baPostedData,

LPCTSTR lpszHeaders, BOOL* pbCancel )

{

LPCTSTR APP_PROTOCOL = _T("app:");

int len = _tcslen(APP_PROTOCOL);

if (_tcsnicmp(lpszURL, APP_PROTOCOL, len)==0)

{

OnAppCmd(lpszURL +

len); // call

virtual handler fn

*pbCancel =

TRUE; // cancel navigation

}

}

//

// Called when the browser attempts to navigate to "app:foo".

Default handler

// searches command map for "foo" command, and sends parent a

WM_COMMAND

// message with the ID if found. Call SetCmdMap to set the command

map. Only

// override OnAppCmd if you want to do something more

complex.

//

void CHtmlCtrl::OnAppCmd(LPCTSTR lpszCmd)

{

if (m_cmdmap) {

for (int i=0; m_cmdmap[i].name;

i++) {

if

(_tcsicmp(lpszCmd, m_cmdmap[i].name) == 0)

//

Use PostMessage to avoid problems with exit command. (Let

//

browser finish navigation before issuing command.)

GetParent()->PostMessage(WM_COMMAND,

m_cmdmap[i].nID);

}

}

}

//

// Set document contents from string

//

HRESULT CHtmlCtrl::SetHTML(LPCTSTR strHTML)

{

HRESULT hr;

// Get document

object

SPIHTMLDocument2 doc =

GetHtmlDocument();

// Create string as

one-element BSTR safe array for IHTMLDocument2::write.

CComSafeArray

sar;

sar.Create(1,0);

sar[0] = CComBSTR(strHTML);

// open doc and

write

LPDISPATCH lpdRet;

HRCHECK(doc->open(CComBSTR("text/html"),

CComVariant(CComBSTR("_self")),

CComVariant(CComBSTR("")),

CComVariant((bool)1),

&lpdRet));

HRCHECK(doc->write(sar)); //

write contents to doc

HRCHECK(doc->close()); //

close

lpdRet->Release(); //

release IDispatch returned

return S_OK;

}