Microsoft KB Archive/116303

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FIX: Registered Message in a USRDLL May Cause a GPF

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Q116303

1.00 WINDOWS kbprg kbfixlist kbbuglist -- The information in this article applies to: - The Microsoft Foundation Classes (MFC), included with: Microsoft Visual C++ for Windows, version 1.0 -- SYMPTOMS ======== Using a registered message in a USRDLL may cause a general protection fault (GPF). CAUSE ===== The CWnd::WindowProc function does not calculate the address of the registered message correctly. RESOLUTION ========== To avoid the problem, do one of the following: - Upgrade to Visual C++ for Windows, version 1.5, since this problem was fixed in the MFC library, version 2.5. -or- - Modify the CWnd::WindowProc function in the MFC library source code and rebuild the USRDLL version of the library. To do this, change line 908 of the file WINCORE.CPP from #ifndef _WINDLL to #ifndef _AFXDLL After making this change, rebuild the USRDLL version of the MFC library by following the procedure outlined on page 303 of Appendix B in the "Class Library User's Guide." STATUS ====== Microsoft has confirmed this to be a problem in Visual C++ for Windows, version 1.0. This problem was corrected in Visual C++ for Windows, version 1.5. This is not a problem in Visual C++ 32-bit Edition. Additional reference words: 1.00 2.00 KBCategory: kbprg kbfixlist kbbuglist KBSubcategory: MfcDLL

Keywords : kb16bitonly kbDLL kbMFC kbVC

Issue type :

Technology : kbAudDeveloper kbMFC