参考文章：
MSDN Q324419:BUG: Scroll Bars and Borders Appear in Framesets When You Navigate Again in BeforeNavigate;
MSDN Q236312:How to disable the default pop-up menu for CHtmlView in Visual C++;
MSDN Q196835:How to override the default behavior of several of the MFC control container interface methods in Visual C++;
成因：WebBrowser控件边界的成因简单的说是Bug而不同于CFormView边界的成因（Style），因为在不对WebBrowser进行Navigate的时候，是不会出现边界和ScrollBar的。
解决方案：
上面提到的第一篇文章中，有详细的解决去除ScrollBar的方法的，主要是用到重写DocumentComplete的方法，就可以解决ScrollBar的问题，第一篇文章中，只是粗粗提到了要用重写GetHostInfo的方法来解决边界问题，但是说的并不够详细，查阅了另外两篇参考文章后，终于得解，下面只提供解决步骤，详细原因请自我分析：
假定新建了一个对话框或单/多文档工程MySample
步骤一：在MySample.h中加入为CMySampleApp类加入public成员变量：
public:
class CImpIDispatch* m_pDispOM;
步骤二：为工程加入头文件Custsite.h，内容如下：
//=--------------------------------------------------------------------------=
// (C) Copyright 1996-1999 Microsoft Corporation. All Rights Reserved.
//=--------------------------------------------------------------------------=
#ifndef __CUSTOMSITEH__
#define __CUSTOMSITEH__
#include "idispimp.h"
#include <mshtmhst.h>
//
// NOTE:
// Some of the code in this file is MFC implementation specific.
// Changes in future versions of MFC implementation may require
// the code to be changed. Please check the readme of this
// sample for more information
//
class CCustomControlSite:public COleControlSite
{
public:
CCustomControlSite(COleControlContainer *pCnt):COleControlSite(pCnt){}
protected:
DECLARE_INTERFACE_MAP();
BEGIN_INTERFACE_PART(DocHostUIHandler, IDocHostUIHandler)
STDMETHOD(ShowContextMenu)(/* [in] */ DWORD dwID,
/* [in] */ POINT __RPC_FAR *ppt,
/* [in] */ IUnknown __RPC_FAR *pcmdtReserved,
/* [in] */ IDispatch __RPC_FAR *pdispReserved);
STDMETHOD(GetHostInfo)(
/* [out][in] */ DOCHOSTUIINFO __RPC_FAR *pInfo);
STDMETHOD(ShowUI)(
/* [in] */ DWORD dwID,
/* [in] */ IOleInPlaceActiveObject __RPC_FAR *pActiveObject,
/* [in] */ IOleCommandTarget __RPC_FAR *pCommandTarget,
/* [in] */ IOleInPlaceFrame __RPC_FAR *pFrame,
/* [in] */ IOleInPlaceUIWindow __RPC_FAR *pDoc);
STDMETHOD(HideUI)(void);
STDMETHOD(UpdateUI)(void);
STDMETHOD(EnableModeless)(/* [in] */ BOOL fEnable);
STDMETHOD(OnDocWindowActivate)(/* [in] */ BOOL fEnable);
STDMETHOD(OnFrameWindowActivate)(/* [in] */ BOOL fEnable);
STDMETHOD(ResizeBorder)(
/* [in] */ LPCRECT prcBorder,
/* [in] */ IOleInPlaceUIWindow __RPC_FAR *pUIWindow,
/* [in] */ BOOL fRameWindow);
STDMETHOD(TranslateAccelerator)(
/* [in] */ LPMSG lpMsg,
/* [in] */ const GUID __RPC_FAR *pguidCmdGroup,
/* [in] */ DWORD nCmdID);
STDMETHOD(GetOptionKeyPath)(
/* [out] */ LPOLESTR __RPC_FAR *pchKey,
/* [in] */ DWORD dw);
STDMETHOD(GetDropTarget)(
/* [in] */ IDropTarget __RPC_FAR *pDropTarget,
/* [out] */ IDropTarget __RPC_FAR *__RPC_FAR *ppDropTarget);
STDMETHOD(GetExternal)(
/* [out] */ IDispatch __RPC_FAR *__RPC_FAR *ppDispatch);
STDMETHOD(TranslateUrl)(
/* [in] */ DWORD dwTranslate,
/* [in] */ OLECHAR __RPC_FAR *pchURLIn,
/* [out] */ OLECHAR __RPC_FAR *__RPC_FAR *ppchURLOut);
STDMETHOD(FilterDataObject)(
/* [in] */ IDataObject __RPC_FAR *pDO,
/* [out] */ IDataObject __RPC_FAR *__RPC_FAR *ppDORet);
END_INTERFACE_PART(DocHostUIHandler)
};
class CCustomOccManager :public COccManager
{
public:
CCustomOccManager(){}
COleControlSite* CreateSite(COleControlContainer* pCtrlCont)
{
CCustomControlSite *pSite = new CCustomControlSite(pCtrlCont);
return pSite;
}
};
#endif
步骤三：为工程加入CPP文件Custsite.cpp，内容如下：
//=--------------------------------------------------------------------------=
// (C) Copyright 1996-1999 Microsoft Corporation. All Rights Reserved.
//=--------------------------------------------------------------------------=
//
// NOTE:
// Some of the code in this file is MFC implementation specific.
// Changes in future versions of MFC implementation may require
// the code to be changed. Please check the readme of this
// sample for more information
//
#include "stdafx.h"
#undef AFX_DATA
#define AFX_DATA AFX_DATA_IMPORT
#include "MySample.h"
// NOTE: This line is a hardcoded reference to an MFC header file
// this path may need to be changed to refer to the location of VC5 install
// for successful compilation.
#include <..\src\occimpl.h>
#undef AFX_DATA
#define AFX_DATA AFX_DATA_EXPORT
#include "custsite.h"
BEGIN_INTERFACE_MAP(CCustomControlSite, COleControlSite)
INTERFACE_PART(CCustomControlSite, IID_IDocHostUIHandler, DocHostUIHandler)
END_INTERFACE_MAP()
ULONG FAR EXPORT CCustomControlSite::XDocHostUIHandler::AddRef()
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return pThis->ExternalAddRef();
}
ULONG FAR EXPORT CCustomControlSite::XDocHostUIHandler::Release()
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return pThis->ExternalRelease();
}
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::QueryInterface(REFIID riid, void **ppvObj)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
HRESULT hr = (HRESULT)pThis->ExternalQueryInterface(&riid, ppvObj);
return hr;
}
// * CImpIDocHostUIHandler::GetHostInfo
// *
// * Purpose: Called at initialization
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::GetHostInfo( DOCHOSTUIINFO* pInfo )
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
pInfo->dwFlags = DOCHOSTUIFLAG_NO3DBORDER;
pInfo->dwDoubleClick = DOCHOSTUIDBLCLK_DEFAULT;
return S_OK;
}
// * CImpIDocHostUIHandler::ShowUI
// *
// * Purpose: Called when MSHTML.DLL shows its UI
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::ShowUI(
DWORD dwID,
IOleInPlaceActiveObject * /*pActiveObject*/,
IOleCommandTarget * pCommandTarget,
IOleInPlaceFrame * /*pFrame*/,
IOleInPlaceUIWindow * /*pDoc*/)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
// We've already got our own UI in place so just return S_OK
return S_OK;
}
// * CImpIDocHostUIHandler::HideUI
// *
// * Purpose: Called when MSHTML.DLL hides its UI
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::HideUI(void)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return S_OK;
}
// * CImpIDocHostUIHandler::UpdateUI
// *
// * Purpose: Called when MSHTML.DLL updates its UI
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::UpdateUI(void)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
// MFC is pretty good about updating it's UI in it's Idle loop so I don't do anything here
return S_OK;
}
// * CImpIDocHostUIHandler::EnableModeless
// *
// * Purpose: Called from MSHTML.DLL's IOleInPlaceActiveObject::EnableModeless
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::EnableModeless(BOOL /*fEnable*/)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return E_NOTIMPL;
}
// * CImpIDocHostUIHandler::OnDocWindowActivate
// *
// * Purpose: Called from MSHTML.DLL's IOleInPlaceActiveObject::OnDocWindowActivate
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::OnDocWindowActivate(BOOL /*fActivate*/)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return E_NOTIMPL;
}
// * CImpIDocHostUIHandler::OnFrameWindowActivate
// *
// * Purpose: Called from MSHTML.DLL's IOleInPlaceActiveObject::OnFrameWindowActivate
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::OnFrameWindowActivate(BOOL /*fActivate*/)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return E_NOTIMPL;
}
// * CImpIDocHostUIHandler::ResizeBorder
// *
// * Purpose: Called from MSHTML.DLL's IOleInPlaceActiveObject::ResizeBorder
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::ResizeBorder(
LPCRECT /*prcBorder*/,
IOleInPlaceUIWindow* /*pUIWindow*/,
BOOL /*fRameWindow*/)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return E_NOTIMPL;
}
// * CImpIDocHostUIHandler::ShowContextMenu
// *
// * Purpose: Called when MSHTML.DLL would normally display its context menu
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::ShowContextMenu(
DWORD /*dwID*/,
POINT* /*pptPosition*/,
IUnknown* /*pCommandTarget*/,
IDispatch* /*pDispatchObjectHit*/)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return S_OK; // We've shown our own context menu. MSHTML.DLL will no longer try to show its own.
}
// * CImpIDocHostUIHandler::TranslateAccelerator
// *
// * Purpose: Called from MSHTML.DLL's TranslateAccelerator routines
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::TranslateAccelerator(LPMSG lpMsg,
/* [in] */ const GUID __RPC_FAR *pguidCmdGroup,
/* [in] */ DWORD nCmdID)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return S_FALSE;
}
// * CImpIDocHostUIHandler::GetOptionKeyPath
// *
// * Purpose: Called by MSHTML.DLL to find where the host wishes to store
// * its options in the registry
// *
HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::GetOptionKeyPath(BSTR* pbstrKey, DWORD)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return E_NOTIMPL;
}
STDMETHODIMP CCustomControlSite::XDocHostUIHandler::GetDropTarget(
/* [in] */ IDropTarget __RPC_FAR *pDropTarget,
/* [out] */ IDropTarget __RPC_FAR *__RPC_FAR *ppDropTarget)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return E_NOTIMPL;
}
STDMETHODIMP CCustomControlSite::XDocHostUIHandler::GetExternal(
/* [out] */ IDispatch __RPC_FAR *__RPC_FAR *ppDispatch)
{
// return the IDispatch we have for extending the object Model
IDispatch* pDisp = (IDispatch*)theApp.m_pDispOM;
pDisp->AddRef();
*ppDispatch = pDisp;
return S_OK;
}
STDMETHODIMP CCustomControlSite::XDocHostUIHandler::TranslateUrl(
/* [in] */ DWORD dwTranslate,
/* [in] */ OLECHAR __RPC_FAR *pchURLIn,
/* [out] */ OLECHAR __RPC_FAR *__RPC_FAR *ppchURLOut)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return E_NOTIMPL;
}
STDMETHODIMP CCustomControlSite::XDocHostUIHandler::FilterDataObject(
/* [in] */ IDataObject __RPC_FAR *pDO,
/* [out] */ IDataObject __RPC_FAR *__RPC_FAR *ppDORet)
{
METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)
return E_NOTIMPL;
}
步骤四：为工程加入头文件Idispimp.h，内容如下：
/*
* IDispimp.H
* IDispatch
*
* Copyright (c)1995-1999 Microsoft Corporation, All Rights Reserved
*/
#ifndef _IDISPIMP_H_
#define _IDISPIMP_H_
class CImpIDispatch : public IDispatch
{
protected:
ULONG m_cRef;
public:
CImpIDispatch(void);
~CImpIDispatch(void);
STDMETHODIMP QueryInterface(REFIID, void **);
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP_(ULONG) Release(void);
//IDispatch
STDMETHODIMP GetTypeInfoCount(UINT* pctinfo);
STDMETHODIMP GetTypeInfo(/* [in] */ UINT iTInfo,
/* [in] */ LCID lcid,
/* [out] */ ITypeInfo** ppTInfo);
STDMETHODIMP GetIDsOfNames(
/* [in] */ REFIID riid,
/* [size_is][in] */ LPOLESTR *rgszNames,
/* [in] */ UINT cNames,
/* [in] */ LCID lcid,
/* [size_is][out] */ DISPID *rgDispId);
STDMETHODIMP Invoke(
/* [in] */ DISPID dispIdMember,
/* [in] */ REFIID riid,
/* [in] */ LCID lcid,
/* [in] */ WORD wFlags,
/* [out][in] */ DISPPARAMS *pDispParams,
/* [out] */ VARIANT *pVarResult,
/* [out] */ EXCEPINFO *pExcepInfo,
/* [out] */ UINT *puArgErr);
};
#endif //_IDISPIMP_H_
步骤五：为工程加入CPP文件Idispimp.cpp，内容如下：
/*
* idispimp.CPP
* IDispatch for Extending Dynamic HTML Object Model
*
* Copyright (c)1995-1999 Microsoft Corporation, All Rights Reserved
*/
#include "stdafx.h"
#include "idispimp.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
// Hardcoded information for extending the Object Model
// Typically this would be supplied through a TypeInfo
// In this case the name "xxyyzz" maps to DISPID_Extend
const WCHAR pszExtend[10]=L"xxyyzz";
#define DISPID_Extend 12345
/*
* CImpIDispatch::CImpIDispatch
* CImpIDispatch::~CImpIDispatch
*
* Parameters (Constructor):
* pSite PCSite of the site we're in.
* pUnkOuter LPUNKNOWN to which we delegate.
*/
CImpIDispatch::CImpIDispatch( void )
{
m_cRef = 0;
}
CImpIDispatch::~CImpIDispatch( void )
{
ASSERT( m_cRef == 0 );
}
/*
* CImpIDispatch::QueryInterface
* CImpIDispatch::AddRef
* CImpIDispatch::Release
*
* Purpose:
* IUnknown members for CImpIDispatch object.
*/
STDMETHODIMP CImpIDispatch::QueryInterface( REFIID riid, void **ppv )
{
*ppv = NULL;
if ( IID_IDispatch == riid )
{
*ppv = this;
}
if ( NULL != *ppv )
{
((LPUNKNOWN)*ppv)->AddRef();
return NOERROR;
}
return E_NOINTERFACE;
}
STDMETHODIMP_(ULONG) CImpIDispatch::AddRef(void)
{
return ++m_cRef;
}
STDMETHODIMP_(ULONG) CImpIDispatch::Release(void)
{
return --m_cRef;
}
//IDispatch
STDMETHODIMP CImpIDispatch::GetTypeInfoCount(UINT* /*pctinfo*/)
{
return E_NOTIMPL;
}
STDMETHODIMP CImpIDispatch::GetTypeInfo(/* [in] */ UINT /*iTInfo*/,
/* [in] */ LCID /*lcid*/,
/* [out] */ ITypeInfo** /*ppTInfo*/)
{
return E_NOTIMPL;
}
STDMETHODIMP CImpIDispatch::GetIDsOfNames(
/* [in] */ REFIID riid,
/* [size_is][in] */ OLECHAR** rgszNames,
/* [in] */ UINT cNames,
/* [in] */ LCID lcid,
/* [size_is][out] */ DISPID* rgDispId)
{
HRESULT hr;
UINT i;
// Assume some degree of success
hr = NOERROR;
// Hardcoded mapping for this sample
// A more usual procedure would be to use a TypeInfo
for ( i=0; i < cNames; i++)
{
if ( 2 == CompareString( lcid, NORM_IGNOREWIDTH, (char*)pszExtend, 3, (char*)rgszNames[i], 3 ) )
{
rgDispId[i] = DISPID_Extend;
}
else
{
// One or more are unknown so set the return code accordingly
hr = ResultFromScode(DISP_E_UNKNOWNNAME);
rgDispId[i] = DISPID_UNKNOWN;
}
}
return hr;
}
STDMETHODIMP CImpIDispatch::Invoke(
/* [in] */ DISPID dispIdMember,
/* [in] */ REFIID /*riid*/,
/* [in] */ LCID /*lcid*/,
/* [in] */ WORD wFlags,
/* [out][in] */ DISPPARAMS* pDispParams,
/* [out] */ VARIANT* pVarResult,
/* [out] */ EXCEPINFO* /*pExcepInfo*/,
/* [out] */ UINT* puArgErr)
{
// For this sample we only support a Property Get on DISPID_Extend
// returning a BSTR with "Wibble" as the value
if ( dispIdMember == DISPID_Extend )
{
if ( wFlags & DISPATCH_PROPERTYGET )
{
if ( pVarResult != NULL )
{
WCHAR buff[10]=L"Wibble";
BSTR bstrRet = SysAllocString( buff );
VariantInit(pVarResult);
V_VT(pVarResult)=VT_BSTR;
V_BSTR(pVarResult) = bstrRet;
}
}
}
return S_OK;
}
步骤六：打开MySample.cpp并在CMySample类的InitInstance函数中加入如下代码，另外请注掉原有的AfxEnableControlContainer():
BOOL CMySampleApp::InitInstance()
{
CCustomOccManager *pMgr = new CCustomOccManager;
// Create an IDispatch class for extending the Dynamic HTML Object Model
m_pDispOM = new CImpIDispatch;
// Set our control containment up but using our control container
// management class instead of MFC's default
AfxEnableControlContainer(pMgr);
// AfxEnableControlContainer();
//... rest of the code here
}
步骤七：把以下include文件添加到MySample.h中去（注意这里与参考文献稍有差别）
#include <afxpriv.h>
#if (_MFC_VER < 0x0700)
#include <..\src\occimpl.h> // For COccManager
#else
#include <afxocc.h>
#endif
#include "CustSite.h"
（其中对MFC版本的判断是因为VC7的版本中occimpl.h已经被去除了）
步骤八：在MySample.h文件最后加入以下语句：
extern CMySampleApp theApp;
（很可能这行已经由MFC自动添加了）
以上就是整体解决方案，利用此种方法，还可以对WebBrowser进行其他扩展，以后再说
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