FIX: Unresolved Externals When Building MFC42 and MFCD42xDLast reviewed: December 1, 1997Article ID: Q174403 |
The information in this article applies to:
SYMPTOMSWhen rebuilding Mfc42.dll, Mfcd42d.dll, or Mfcd42ud.dll after installing Visual Studio 97 Service Pack 1 or Service Pack 2, the “LNK2001: unresolved external symbol” error message occurs for the following functions:
AfxThunkSQLDescribeColA AfxThunkSQLDriverConnectA AfxThunkSQLErrorA AfxThunkSQLExecDirectA AfxThunkSQLGetCursorNameA AfxThunkSQLGetInfoA AfxThunkSQLPrepareA AfxThunkSQLSetConnectOptionA CAUSEThe symbols generated for these functions when compiling the file Dbcore.cpp do not match the function definitions specified for export in Mfc42.def, Mfcd42d.def, or Mfcd42ud.def.
RESOLUTIONModify the function definitions in Mfc42.def, mfcd42d.def, or mfcd42ud.def to match the symbols for the function generated when compiling Dbcore.cpp.
STATUSMicrosoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Studio 97 Service Pack 3. For more information, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q170365 TITLE : INFO: Visual Studio 97 Service Packs - What, Where, and Why MORE INFORMATIONThe difference between the function definitions in Dbcore.cpp and Mfc42.def, Mfcd42d.def, or Mfcd42ud.def is that the function definitions have an "A" appended to the function names in Mfc42.def, Mfcd42d.def, or Mfcd42ud.def. These functions exist in Dbcore.cpp without the "A" appended to the function name. Remove the "A" from the function names in question for the .def file you specify when rebuilding Mfc42.dll, Mfcd42d.dll, or Mfcd42ud.dll. For example: Change the following
?AfxThunkSQLDescribeColA@@YGFPAXGPAEFPAF2PAK22@Z @ 1507 NONAMEto the following:
?AfxThunkSQLDescribeCol@@YGFPAXGPAEFPAF2PAK22@Z @ 1507 NONAME REFERENCESSee the section "Building the MFC DLL" in TN033 for information on how to rebuild the MFC DLL.
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Additional query words: AfxThunkSQL
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