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分享一个很诡异的异常，AfxOleGetMessageFilter()->Register()断言失败
最近在调试ModbusServer程序，原文链接：这里，Debug模式下碰到一个断言失败，调试了许久，没找到问题的原因所在，看看这里有没大神可以助我一臂之力。异常函数如下：
BOOL AFXAPI AfxOleInit2()
{
_AFX_THREAD_STATE* pState = AfxGetThreadState();
ASSERT(!pState->m_bNeedTerm); // calling it twice?
// Special case DLL context to assume that the calling app initializes OLE.
// For DLLs where this is not the case, those DLLs will need to initialize
// OLE for themselves via OleInitialize. This is done since MFC cannot provide
// automatic uninitialize for DLLs because it is not valid to shutdown OLE
// during a DLL_PROCESS_DETACH.
if (afxContextIsDLL)
{
pState->m_bNeedTerm = -1; // -1 is a special flag
return TRUE;
}
// first, initialize OLE
//SCODE sc = ::OleInitialize(NULL);
SCODE sc = ::CoInitializeEx(NULL,COINIT_MULTITHREADED);
//SCODE sc = ::CoInitializeEx(NULL,COINIT_APARTMENTTHREADED);
if (FAILED(sc))
{
// warn about non-NULL success codes
TRACE1("Warning: OleInitialize returned scode = %s.\n",
AfxGetFullScodeString(sc));
goto InitFailed;
}
// termination required when OleInitialize does not fail
pState->m_bNeedTerm = TRUE;
// hook idle time and exit time for required OLE cleanup
CWinThread* pThread; pThread = AfxGetThread();
pThread->m_lpfnOleTermOrFreeLib = AfxOleTermOrFreeLib;
// allocate and initialize default message filter
if (pThread->m_pMessageFilter == NULL)
{
pThread->m_pMessageFilter = new COleMessageFilter;
ASSERT(AfxOleGetMessageFilter() != NULL);
AfxOleGetMessageFilter()->Register();
}
#ifdef _MAC
CWinApp* pApp; pApp = AfxGetApp();
#ifndef _WINDLL
// Mac MFC uses a static version of ole2ui which must be initialized
if (pState->m_bNeedTerm && !::OleUIInitialize(pApp->m_hInstance,
pApp->m_hPrevInstance, SZCLASSICONBOX, SZCLASSRESULTIMAGE))
goto InitFailed;
#endif
_afxPfnOleAuto = NewAEEventHandlerProc(_AfxOleAutoHandler);
if (_afxPfnOleAuto != NULL)
{
AEInstallEventHandler('OLE2', 'AUTO', _afxPfnOleAuto, (long) pApp, false);
}
#endif
return TRUE;
InitFailed:
AfxOleTerm();
return FALSE;
}
...全文
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schlafenhamster 2015-11-27
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ASSERT(pFactory == NULL ||
AfxIsValidAddress(pFactory, sizeof(COleObjectFactory)));
到底是 哪个？
wolfmvp 2015-11-27
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试过，Debug模式依旧报断言错误。
schlafenhamster 2015-11-27
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“无法在线Debug”
是 debug 的 new 问题 ？，试试 静态 分配
wolfmvp 2015-11-27
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这个函数位于安装目录下的OLELINK.CPP文件中（“C:\Program Files\Microsoft Visual Studio\VC98\MFC\SRC\OLELINK.CPP”），并不属于应用层函数。目前该工程最大的遗憾就是无法在线Debug，Release模式下可以实现所需要的功能。
schlafenhamster 2015-11-27
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AfxIsValidAddress
BOOL AfxIsValidAddress( const void* lp, UINT nBytes, BOOL bReadWrite = TRUE );
Return Value
Nonzero if the specified memory block is contained entirely within the program’s memory space; otherwise 0.
Parameters
lp
Points to the memory address to be tested.
nBytes
Contains the number of bytes of memory to be tested.
bReadWrite
Specifies whether the memory is both for reading and writing (TRUE) or just reading (FALSE).
Remarks
Tests any memory address to ensure that it is contained entirely within the program’s memory space. The address is not restricted to blocks allocated by new.
改变 size 和 bReadWrite 试试， 如
AfxIsValidAddress(pViewClass, sizeof(CRuntimeClass), FALSE));
wolfmvp 2015-11-27
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这个“AfxIsValidAddress(pFactory, sizeof(COleObjectFactory))”
schlafenhamster 2015-11-26
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注意
delete pThread->m_pMessageFilter;
wolfmvp 2015-11-26
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我贴的源码中，这个地方的处理也没啥不妥。
// allocate and initialize default message filter
if (pThread->m_pMessageFilter == NULL)
{
pThread->m_pMessageFilter = new COleMessageFilter;
ASSERT(AfxOleGetMessageFilter() != NULL);
AfxOleGetMessageFilter()->Register();
}BOOL COleLinkingDoc::Register(COleObjectFactory* pFactory, LPCTSTR lpszPathName)
{
USES_CONVERSION;
ASSERT_VALID(this);
// 程序在这里跳出断言失败窗口
ASSERT(pFactory == NULL ||
AfxIsValidAddress(pFactory, sizeof(COleObjectFactory)));
ASSERT(lpszPathName == NULL || AfxIsValidString(lpszPathName));
ASSERT(m_dwRegister == 0);
// attach the document to the server
ASSERT(m_pFactory == NULL || m_pFactory == pFactory);
m_pFactory = pFactory;
BOOL bResult = TRUE;
// create file moniker based on path name
RELEASE(m_lpMonikerROT);
m_strMoniker.Empty();
if (lpszPathName != NULL)
{
if (CreateFileMoniker(T2COLE(lpszPathName), &m_lpMonikerROT) != S_OK)
bResult = FALSE;
}
// register file moniker as running
if (m_lpMonikerROT != NULL)
{
// see if the object is already running in the ROT
LPRUNNINGOBJECTTABLE lpROT = NULL;
VERIFY(GetRunningObjectTable(0, &lpROT) == S_OK);
ASSERT(lpROT != NULL);
LPUNKNOWN lpUnk;
if (lpROT->GetObject(m_lpMonikerROT, &lpUnk) == S_OK)
{
// fatal error -- can't register same moniker twice!
lpUnk->Release();
RELEASE(m_lpMonikerROT);
return FALSE;
}
// not already running -- so ok to attempt registration
SCODE sc = lpROT->Register(NULL, (LPUNKNOWN)
GetInterface(&IID_IUnknown), m_lpMonikerROT, &m_dwRegister);
lpROT->Release();
m_strMoniker = lpszPathName;
if (sc != S_OK)
bResult = FALSE;
}
// update all objects with new moniker
POSITION pos = GetStartPosition();
COleClientItem* pItem;
while ((pItem = GetNextClientItem(pos)) != NULL)
{
if (pItem->m_bMoniker)
{
ASSERT(pItem->m_lpObject != NULL);
pItem->m_lpObject->SetMoniker(OLEWHICHMK_CONTAINER,
m_lpMonikerROT);
}
}
return bResult;
}schlafenhamster 2015-11-26
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Then, in the InitInstance() of the CWinApp derived class, unregister the IMessageFilter MFC registers for you when calling AfxOleInit(). Add this code after the call to AfxOleInit(). Then instantiate a class of type CMyMessageFilter and register it:
BOOL CmyApp::InitInstance()
{
// Initialize OLE libraries and registers default message filter.
if (!AfxOleInit())
{
AfxMessageBox(IDP_OLE_INIT_FAILED);
return FALSE;
}
CWinThread* pThread = AfxGetThread();
if (pThread != NULL)
{
// Destroy message filter, thereby unregistering it.
delete pThread->m_pMessageFilter;
pThread->m_pMessageFilter = NULL;
// Create the new message filter object.
pThread->m_pMessageFilter = new CMyMessageFilter;
ASSERT(AfxOleGetMessageFilter() != NULL);
// Register the new message filter object.
AfxOleGetMessageFilter()->Register();
}
...
...
}
