Webbrowse取消默认文件替换功能，并获取拖放文件路径列表

 

#include "StdAfx.h"#pragma once#include "oleidl.h"class IDropTargetImpl :public IDropTarget{public:IDropTargetImpl(void){m_def=0;}~IDropTargetImpl(void){}HRESULT STDMETHODCALLTYPE QueryInterface( REFIID riid,void** ppvObject){if(!ppvObject)return E_POINTER;if (riid==IID_IUnknown||riid==IID_IDropTarget){*ppvObject=static_cast<IDropTarget*>(this);}elsereturn (*ppvObject=0),E_NOINTERFACE;((IUnknown*)*ppvObject)->AddRef();return S_OK;}ULONG STDMETHODCALLTYPE AddRef( void){return ++m_def;}ULONG STDMETHODCALLTYPE Release( void) {ULONG Temp=--m_def;if (m_def==0){delete this;}return Temp;}HRESULT STDMETHODCALLTYPE DragEnter( /* [unique][in] */ IDataObject *pDataObj,/* [in] */ DWORD grfKeyState,/* [in] */ POINTL pt,/* [out][in] */ DWORD *pdwEffect){/*FORMATETC cFmt = {(CLIPFORMAT) CF_TEXT, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};STGMEDIUM stgMedium;HRESULT  hr = pDataObj->GetData(&cFmt, &stgMedium);if (S_OK != hr){return E_FAIL;}*/return S_OK;}HRESULT STDMETHODCALLTYPE DragOver( /* [in] */ DWORD grfKeyState,/* [in] */ POINTL pt,/* [out][in] */ DWORD *pdwEffect) {return S_OK;}HRESULT STDMETHODCALLTYPE DragLeave( void) {return S_OK;}HRESULT STDMETHODCALLTYPE Drop( /* [unique][in] */ IDataObject *pDataObj,/* [in] */ DWORD grfKeyState,/* [in] */ POINTL pt,/* [out][in] */ DWORD *pdwEffect){FORMATETC cFmt = {(CLIPFORMAT) CF_HDROP, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};GetDragData(pDataObj,cFmt);return S_OK;}BOOL ProcessDrop(HDROP hDrop){UINT iFiles,ich =0;TCHAR Buffer[MAX_PATH] = {0};memset(&iFiles,0xff,sizeof(iFiles));CString strFilePath;int Count = ::DragQueryFile(hDrop,iFiles,Buffer,0); //Get the Drag _Files Number.if(Count){for (int i=0;i<Count;i++){if(::DragQueryFile(hDrop,i,Buffer,sizeof(Buffer))){strFilePath = Buffer;//获取了路径做相应处理memset(Buffer,0,sizeof(Buffer) );}}}::DragFinish(hDrop);return true; }BOOL GetDragData(IDataObject *pDataObject,FORMATETC cFmt){HRESULT ret=S_OK;STGMEDIUM stgMedium;ret = pDataObject->GetData(&cFmt, &stgMedium);//GetData(CF_TEXT, &stgMedium);if (FAILED(ret)){return FALSE;}if (stgMedium.pUnkForRelease != NULL){return FALSE;}switch (stgMedium.tymed){case TYMED_HGLOBAL:{ProcessDrop((HDROP)stgMedium.hGlobal);return true;break;}default:{::ReleaseStgMedium(&stgMedium);}break;}return false;}protected:ULONG m_def;};/////////////////////////////////////////////////////////////////////////////////////////////////class IHandlerImpl :public IDocHostUIHandler{public:IHandlerImpl(void){m_def=0;}~IHandlerImpl(void){}virtual HRESULT STDMETHODCALLTYPE ShowContextMenu( /* [in] */ DWORD dwID,/* [in] */ POINT *ppt,/* [in] */ IUnknown *pcmdtReserved,/* [in] */ IDispatch *pdispReserved) {//    ATLTRACE("%d,%d",ppt->x,ppt->y);return S_FALSE;}virtual HRESULT STDMETHODCALLTYPE GetHostInfo( /* [out][in] */ DOCHOSTUIINFO *pInfo) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE ShowUI( /* [in] */ DWORD dwID,/* [in] */ IOleInPlaceActiveObject *pActiveObject,/* [in] */ IOleCommandTarget *pCommandTarget,/* [in] */ IOleInPlaceFrame *pFrame,/* [in] */ IOleInPlaceUIWindow *pDoc) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE HideUI( void) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE UpdateUI( void){return S_OK;}virtual HRESULT STDMETHODCALLTYPE EnableModeless( /* [in] */ BOOL fEnable) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE OnDocWindowActivate( /* [in] */ BOOL fActivate) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE OnFrameWindowActivate( /* [in] */ BOOL fActivate){return S_OK;}virtual HRESULT STDMETHODCALLTYPE ResizeBorder( /* [in] */ LPCRECT prcBorder,/* [in] */ IOleInPlaceUIWindow *pUIWindow,/* [in] */ BOOL fRameWindow) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE TranslateAccelerator( /* [in] */ LPMSG lpMsg,/* [in] */ const GUID *pguidCmdGroup,/* [in] */ DWORD nCmdID) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE GetOptionKeyPath( /* [out] */ LPOLESTR *pchKey,/* [in] */ DWORD dw) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE GetDropTarget( /* [in] */ IDropTarget *pDropTarget,/* [out] */ IDropTarget **ppDropTarget) {IDropTarget *pDrag = new IDropTargetImpl;*ppDropTarget = pDrag;((IUnknown*)*ppDropTarget)->AddRef();return S_OK;}virtual HRESULT STDMETHODCALLTYPE GetExternal( /* [out] */ IDispatch **ppDispatch){return S_OK;}virtual HRESULT STDMETHODCALLTYPE TranslateUrl( /* [in] */ DWORD dwTranslate,/* [in] */ OLECHAR *pchURLIn,/* [out] */ OLECHAR **ppchURLOut) {return S_OK;}virtual HRESULT STDMETHODCALLTYPE FilterDataObject( /* [in] */ IDataObject *pDO,/* [out] */ IDataObject **ppDORet) {return S_FALSE;}HRESULT STDMETHODCALLTYPE QueryInterface( REFIID riid,void** ppvObject){return S_OK;}ULONG STDMETHODCALLTYPE AddRef( void){return ++m_def;}ULONG STDMETHODCALLTYPE Release( void) {ULONG Temp=--m_def;if (m_def==0){delete this;}return Temp;}protected:ULONG m_def;};

真正处理拖放的是IDropTarget，使用方法：替换默认的文件拖放，代码为

CComPtr<IHTMLDocument2> spDoc;                  m_HtmlEditCtrl.GetDHtmlDocument(&spDoc);  CComPtr<ICustomDoc> spCustomDoc;spDoc->QueryInterface(IID_ICustomDoc, (void **)&spCustomDoc);  CComPtr<IDocHostUIHandler> spDocHostUIHandler;   spCustomDoc->QueryInterface(IID_IDocHostUIHandler, (void **)&spDocHostUIHandler);  IDocHostUIHandler* myDocHandler = new IHandlerImpl;HRESULT r = spCustomDoc->SetUIHandler(myDocHandler);