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Q141485: FIX: LNK1152 & LNK1141 When Linking OLE Control to Mapi32.lib

Article: Q141485
Product(s): Microsoft C Compiler
Version(s): 4.0
Operating System(s): 
Keyword(s): kbole kbCtrl kbDLL kbMFC kbVC400bug kbVC410fix kbGrpDSMFCATL kbNoUpdate
Last Modified: 14-NOV-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Visual C++, 32-bit Editions, version 4.0 
-------------------------------------------------------------------------------

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

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.

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.

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.

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:

  Q131313 How to Create 32-bit Import Libraries Without .OBJs or Source

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

Additional query words: kbVC400bug LNK1152 LNK1141 LNK4022 LNK4002 4.00 Win32 sdk ocx ole control cdk 4.10

======================================================================
Keywords          : kbole kbCtrl kbDLL kbMFC kbVC400bug kbVC410fix kbGrpDSMFCATL kbNoUpdate 
Technology        : kbVCsearch kbVC400 kbAudDeveloper kbVC32bitSearch
Version           : :4.0
Issue type        : kbbug
Solution Type     : kbfix

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