Reason of a DLL's InitInstance
Lior Messinger -- 100274.2607@compuserve.com
Sunday, April 07, 1996
Platform: Windows NT, VC++ 4.0
Hi,
When programming a DLL in Win32, one can obtain teh reason for
entering the DllEntryPoint main function of a DLL: because of
DLL+PROCESS_ATTACH,DLL_THREAD_ATTACh etc.
When I'm programming with MFC, one option to create a
DLL is to use CWinAPP and to compile as a DLL. First, is it a
good solution? And if so, assuming that InitInstance is the
entry point for the DLL, how can I get the reason for entring
this entry point?
Thanks a lot,
Lior Messinger, Fundtech.
Dan Kirby -- dkirby@accessone.com
Monday, April 08, 1996
Here is the DLLMain from DLLMODUL.CPP in the MFC\SRC directory.
You can see where InitInstance() and ExitInstance() are called. Thread attaching and detaching cases aren't handled.
****
extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpReserved*/)
{
if (dwReason == DLL_PROCESS_ATTACH)
{
BOOL bResult = FALSE;
#ifdef _AFXDLL
// wire up resources from core DLL
AfxCoreInitModule();
#endif
// Initialize DLL's instance(/module) not the app's
if (!AfxWinInit(hInstance, NULL, &afxChNil, 0))
{
AfxWinTerm();
goto Cleanup; // Init Failed
}
// initialize the single instance DLL
CWinApp* pApp; pApp = AfxGetApp();
if (pApp != NULL && !pApp->InitInstance())
{
pApp->ExitInstance();
AfxWinTerm();
goto Cleanup; // Init Failed
}
#ifdef _AFXDLL
// wire up this DLL into the resource chain
VERIFY(AfxInitExtensionModule(controlDLL, hInstance));
CDynLinkLibrary* pDLL; pDLL = new CDynLinkLibrary(controlDLL);
ASSERT(pDLL != NULL);
#else
AfxInitLocalData(hInstance);
#endif
bResult = TRUE;
Cleanup:
#ifdef _AFXDLL
// restore previously-saved module state
VERIFY(AfxSetModuleState(AfxGetThreadState()->m_pPrevModuleState) ==
AfxGetStaticModuleState());
DEBUG_ONLY(AfxGetThreadState()->m_pPrevModuleState = NULL);
#endif
return bResult;
}
else if (dwReason == DLL_PROCESS_DETACH)
{
#ifdef _AFXDLL
// set module state for cleanup
ASSERT(AfxGetThreadState()->m_pPrevModuleState == NULL);
AfxGetThreadState()->m_pPrevModuleState =
AfxSetModuleState(AfxGetStaticModuleState());
#endif
CWinApp* pApp = AfxGetApp();
if (pApp != NULL)
pApp->ExitInstance();
#ifdef _DEBUG
// check for missing AfxLockTempMap calls
if (AfxGetModuleThreadState()->m_nTempMapLock != 0)
{
TRACE1("Warning: Temp map lock count non-zero (%ld).\n",
AfxGetModuleThreadState()->m_nTempMapLock);
}
AfxLockTempMaps();
AfxUnlockTempMaps();
#endif
// terminate the library before destructors are called
AfxWinTerm();
#ifdef _AFXDLL
AfxTermExtensionModule(controlDLL, TRUE);
#else
AfxTermLocalData(hInstance);
#endif
}
return TRUE;
}
----------
From: Lior Messinger[SMTP:100274.2607@compuserve.com]
Sent: Sunday, April 07, 1996 3:04 AM
To: MFC Mailing List
Subject: Reason of a DLL's InitInstance
Platform: Windows NT, VC++ 4.0
Hi,
When programming a DLL in Win32, one can obtain teh reason for
entering the DllEntryPoint main function of a DLL: because of
DLL+PROCESS_ATTACH,DLL_THREAD_ATTACh etc.
When I'm programming with MFC, one option to create a
DLL is to use CWinAPP and to compile as a DLL. First, is it a
good solution? And if so, assuming that InitInstance is the
entry point for the DLL, how can I get the reason for entring
this entry point?
Thanks a lot,
Lior Messinger, Fundtech.
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end
Lior Messinger -- lior@trendline.co.il
Sunday, April 07, 1996
Platform: Windows NT, VC++ 4.0
Hi,
When programming a DLL in Win32, one can obtain teh reason for
entering the DllEntryPoint main function of a DLL: because of
DLL+PROCESS_ATTACH,DLL_THREAD_ATTACh etc.
When I'm programming with MFC, one option to create a
DLL is to use CWinAPP and to compile as a DLL. First, is it a
good solution? And if so, assuming that InitInstance is the
entry point for the DLL, how can I get the reason for entring
this entry point?
Thanks a lot,
Lior Messinger, Fundtech.
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