FIX: Alpha MFC Regular DLL Fails After Porting from Intel (166817)
The information in this article applies to:
- Microsoft Visual C++ 4.0, when used with:
- Microsoft Visual C++ 4.0a, when used with:
This article was previously published under Q166817 SYMPTOMS
When moving a Visual C++ 4.x MFC regular DLL (_USRDLL) project from the
Intel platform to the Alpha RISC platform you may run into one or more of a
set of related problems. Some symptoms are: - CWinApp::InitInstance() is not called.
- Resources stored in the DLL fail to load because AfxGetResourceHandle
or AfxFindResourceHandle returns NULL or an incorrect resource handle.
- AfxGetInstanceHandle() returns NULL.
- Standard MFC database, sockets, or OLE resources fail to load. For
example, AfxLoadString(AFX_IDP_SQL_CONNECT_FAIL) returns an
empty string, even when the Regular DLL is properly using the MFC
Database classes.
CAUSE
When you create the Alpha configuration from an existing Intel based
configuration, the Visual C++ development environment does not copy the /D
_USRDLL compiler flag. This problem does not cause compiler or linker
errors.
Without this symbol defined, the default non-MFC DllMain is used and MFC is
not initialized.
RESOLUTION
Make sure that /D "_USRDLL" is in the compiler options for regular MFC
DLLs. If not, add _USRDLL to the list of preprocessor definitions.
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed
at the beginning of this article. This bug was corrected in Visual C++
version 5.0.
REFERENCES
For more information covering MFC initialization in your Regular DLL, and
other relevant topics, please see the following articles in the Microsoft
Knowledge Base:
140850 HOWTO: Properly Export Functions Using the MFC Shared Library
154126 PRB: Using Extension DLL, Database/OLE/Sockets in Regular DLL
(c) Microsoft Corporation 1997, All Rights Reserved.
Contributions by Kelly Marie Ward, Microsoft Corporation
| Modification Type: | Major | Last Reviewed: | 11/18/2003 |
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| Keywords: | kbBug kbDLL kbfix kbide kbNoUpdate kbVC500fix KB166817 |
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