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FIX: LNK1152 & LNK1141 When Linking OLE Control to Mapi32.lib

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Article ID:141485
Last Review:October 24, 2002
Revision:1.0
This article was previously published under Q141485
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SYMPTOMS

Attempting to link an OLE Control project with Mapi32.lib results in the following warnings and errors:

warning LNK4022: cannot find unique match for symbol "DllCanUnloadNow"
warning LNK4002: _DllCanUnloadNow defined in C:\MSDEV\LIB\MAPI32.LIB
warning LNK4002: _DllCanUnloadNow@0 defined in C:\MSDEV\MFC\lib\mfcs40d.lib
warning LNK4002: _DllCanUnloadNow@0 defined in C:\MSDEV\LIB\oleaut32.lib
warning LNK4022: cannot find unique match for symbol "DllGetClassObject"
warning LNK4002: _DllGetClassObject defined in C:\MSDEV\LIB\MAPI32.LIB
warning LNK4002: _DllGetClassObject@12 defined in C:\MSDEV\MFC\lib\mfcs40d.lib
warning LNK4002: _DllGetClassObject@12 defined in C:\MSDEV\LIB\oleaut32.lib
fatal error LNK1152: cannot resolve one or more undecorated symbols
fatal error LNK1141: failure during build of exports file

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CAUSE

The import library for the Mapi32.dll (Mapi32.lib) incorrectly exports the DllCanUnloadNow and DllGetClassObject functions. These functions should be exported privately and not included in the import library.

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RESOLUTION

To work around this problem, build the Mapi32.lib import library from scratch by using the Lib.exe utility included with Visual C++ 4.0.

Copy the sample code listed below into a text file, and save it as Mapi32.def. From the command prompt, enter the following command line to execute the Lib.exe utility and build a new Mapi32.lib import library:
LIB /DEF:MAPI32.DEF
Replace the incorrect Mapi32.lib file located in the ~\Msdev\Lib directory with this newly created Mapi32.lib file, and rebuild the OLE Control project.

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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++ 4.1.

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MORE INFORMATION

For additional information on how to build import libraries without access to source files, please refer to the following article in the Microsoft Knowledge Base:
131313 (http://support.microsoft.com/kb/131313/EN-US/) How to Create 32-bit Import Libraries Without .OBJs or Source

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Sample Code

; Mapi32.def : Used DUMPBIN /EXPORTS to determine the functions and
; ordinal values listed in the EXPORTS section below. Note
; DllCanUnloadNow, DllGetClassObject, and WEP are NOT listed below.

LIBRARY      "MAPI32.DLL"

EXPORTS
      BMAPIAddress      @35
      BMAPIDetails      @37
      BMAPIFindNext     @34
      BMAPIGetAddress   @36
      BMAPIGetReadMail  @33
      BMAPIReadMail     @32
      BMAPIResolveName  @38
      BMAPISaveMail     @31
      BMAPISendMail     @30
      MAPIAddress       @19
      MAPIDeleteMail    @17
      MAPIDetails       @20
      MAPIFindNext      @16
      MAPIFreeBuffer    @18
      MAPILogoff        @12
      MAPILogon         @11
      MAPIReadMail      @15
      MAPIResolveName   @21
      MAPISaveMail      @14
      MAPISendDocuments @10
      MAPISendMail      @13

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APPLIES TO
•Microsoft Visual C++ 4.0 Standard Edition

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Keywords: 
kbbug kbctrl kbdll kbfix kbnoupdate kbvc410fix KB141485

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