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Q192535: PRB: Regsvr32.exe Fails in Mfco42d.dll Registering MFC Server

Article: Q192535
Product(s): Microsoft C Compiler
Version(s): winnt:5.0,6.0
Operating System(s): 
Keyword(s): kbole kbDebug kbMFC kbVC500 kbVC600 kbGrpDSMFCATLkbfaq
Last Modified: 21-JUL-2001

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0 
   - Microsoft Visual C++, 32-bit Professional Edition, version 5.0 
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 6.0 
   - Microsoft Visual C++, 32-bit Professional Edition, version 6.0 
   - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
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SYMPTOMS
========

Regsvr32 may fail when registering a debug build of an MFC Server. The error
message box may contain the following message:

  The ordinal 3300 could not be located in the dynamic link library
  MFCO42D.DLL.

The ordinal number may vary.

If you click OK, another error message may appear stating:

  RegSvr32: LoadLibrary("<server name>") failed.
  GetLastError returns 0x000000b6.

CAUSE
=====

The error occurs because the Debug MFC DLL's are not binary-compatible between
Visual C++ 5.0 and Visual C++ 6.0. If the user has written a debug build DLL in
Visual C++ 5.0 and attempts to register it on a machine that has Visual C++ 6.0,
then the error will appear.

RESOLUTION
==========

The following are three possible workarounds:

- Build a release version of the server in Visual C++ 5.0 and run it on the
  target Visual C++ 6.0 machine.

- Rebuild the Server using Visual C++ 6.0.

- Copy the MFC debug DLLs from VC++ 5.0 to the same directory on the target
  machine as the MFC ActiveX server (for diagnostic purposes only because
  redistribution violates the Visual C++ license agreement).

STATUS
======

This behavior is by design.

REFERENCES
==========

For additional information, please see the following article(s) in the Microsoft
Knowledge Base:

  Q190487 PRB: MFC Debug DLLs Are Not Compatible Between Versions

Additional query words: 3304

======================================================================
Keywords          : kbole kbDebug kbMFC kbVC500 kbVC600 kbGrpDSMFCATL kbfaq
Technology        : kbAudDeveloper kbMFC
Version           : winnt:5.0,6.0
Issue type        : kbprb

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