Switching for COInitialize to OleInitialize crashes app
From: Peter Carlson (peter_at___NO__SPAM___howudodat.com)
Date: 05/28/04
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Date: Fri, 28 May 2004 16:08:10 -0600
A simple WTL SDI app with the following helper class crashes after a switch
from CoInitialize and CoUnitialize to OleInitialize and OleUninit....()
If EventSinking is turned on (DispEventAdvise) then the app crashes with a
access violation in the Unadvise routine. If event sinking is not turned on
then the app crashes in ~CComPtrBase, p->release. Call stacks are show for
each crash. If I switch back to CoInit... then it doesn't crash. Any
ideas? - Peter
The browser control is created with a call to:
browser1.Create(m_hWnd, rcDefault, NULL, WS_VISIBLE| WS_CHILD,
WS_EX_STATICEDGE);
Call Stack for DispEventUnadvise Crash
htmltest.exe!ATL::AtlUnadvise(IUnknown * pUnkCP=0x0015efe8, const _GUID &
iid={...}, unsigned long dw=1)
htmltest.exe!ATL::IDispEventSimpleImpl<1001,CWndBrowser,&GUID_NULL>::DispEve
ntUnadvise(IUnknown * pUnk=0x0015efe8, const _GUID * piid=0x0012fbfc)
htmltest.exe!CWndBrowser::~CWndBrowser()
htmltest.exe!CHtmltestView::~CHtmltestView()
htmltest.exe!CMainFrame::~CMainFrame()
htmltest.exe!Run(char * __formal=0x00151f14, int nCmdShow=1)
<snipped>
Call Stack for ~CComPtrBase Crash
htmltest.exe!ATL::CComPtrBase<IWebBrowser2>::~CComPtrBase<IWebBrowser2>()
htmltest.exe!ATL::CComPtr<IWebBrowser2>::~CComPtr<IWebBrowser2>()
htmltest.exe!ATL::CComQIPtr<IWebBrowser2,&_GUID_d30c1661_cdaf_11d0_8a3e_00c0
4fc9e26e>::~CComQIPtr<IWebBrowser2,&_GUID_d30c1661_cdaf_11d0_8a3e_00c04fc9e2
6e>()
htmltest.exe!CWndBrowser::~CWndBrowser()
htmltest.exe!CHtmltestView::~CHtmltestView()
htmltest.exe!CMainFrame::~CMainFrame()
htmltest.exe!Run(char * __formal=0x00151f14, int nCmdShow=1)
<snipped>
Here is the CWndBrowser Class
class CWndBrowser :
public CWindowImpl<CWndBrowser, CAxWindow>,
public IDispEventImpl<1001, CWndBrowser>,
public CMessageFilter
{
public:
CWndBrowser() {}
~CWndBrowser(void) {
// DispEventUnadvise(pWB,&m_iid);
CMessageLoop* pLoop = _Module.GetMessageLoop();
if (pLoop) pLoop->RemoveMessageFilter(this);
};
//navigate commands
void Navigate(TCHAR *url){
CComVariant v;
if ( pWB ) pWB->Navigate ( CComBSTR(url), &v, &v, &v, &v );
}
BOOL PreTranslateMessage(MSG* pMsg) {
// process only child messagse
if((pMsg->message < WM_KEYFIRST || pMsg->message > WM_KEYLAST) &&
(pMsg->message < WM_MOUSEFIRST || pMsg->message > WM_MOUSELAST))
return FALSE;
// give HTML page a chance to translate this message
return (BOOL)SendMessage(WM_FORWARDMSG, 0, (LPARAM)pMsg);
}
BEGIN_MSG_MAP(CWndBrowser)
MESSAGE_HANDLER(WM_CREATE, OnCreate)
DEFAULT_REFLECTION_HANDLER()
END_MSG_MAP()
LRESULT OnCreate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL&
/*bHandled*/){
CComPtr<IUnknown> punkCtrl;
CComVariant v;
CreateControlEx ( L"Shell.Explorer", NULL, NULL, &punkCtrl );
pWB = punkCtrl;
if ( pWB ) pWB->Navigate ( CComBSTR("about:blank"), &v, &v, &v, &v );
// Create and wire up event sink to control.
// HRESULT hr = AtlGetObjectSourceInterface(pWB, &m_libid, &m_iid,
&m_wMajorVerNum, &m_wMinorVerNum);
// if (SUCCEEDED(hr)) hr = DispEventAdvise(pWB, &m_iid);
CMessageLoop* pLoop = _Module.GetMessageLoop();
ATLASSERT(pLoop != NULL);
pLoop->AddMessageFilter(this);
return 0;
}
BEGIN_SINK_MAP(CWndBrowser)
SINK_ENTRY(1001, 0x00000103, OnDocumentComplete)
SINK_ENTRY(1001, 0x000000FA, OnBeforeNavigate2Explorer1)
SINK_ENTRY(1001, 0x000000FC, OnNavigateComplete2Explorer1)
END_SINK_MAP()
HRESULT __stdcall OnDocumentComplete(LPDISPATCH pDisp, VARIANT FAR* URL)
{ return S_OK; }
HRESULT __stdcall OnBeforeNavigate2Explorer1(LPDISPATCH pDisp, VARIANT FAR*
URL, VARIANT FAR* Flags, VARIANT FAR* TargetFrameName, VARIANT FAR*
PostData, VARIANT FAR* Headers, BOOL FAR* Cancel) { return S_OK; }
HRESULT __stdcall OnNavigateComplete2Explorer1(LPDISPATCH pDisp, VARIANT
FAR* URL) { return S_OK; }
protected:
CComQIPtr<IWebBrowser2> pWB;
};
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