DOCUMENT:Q150076  10-FEB-2002  [visualc]
TITLE   :BUG: C4003: Not Enough Parameters for SubclassWindow Macro
PRODUCT :Microsoft C Compiler
PROD/VER::1.0,1.5,1.51,1.52,1.52a,2.0,2.1,2.2,4.0,4.1,4.2,5.0,6.0
OPER/SYS:
KEYWORDS:kberrmsg kbCompiler kbCPPonly kbMFC kbVC100bug kbVC150bug kbVC151bug kbVC152bug kbVC200

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The information in this article applies to:

 - Microsoft Visual C++, versions 1.0, 1.5, 1.51, 1.52, 1.52a, 2.0, 2.1, 2.2, 4.0, 4.1, 4.2 
 - Microsoft Visual C++, 32-bit Enterprise Edition, versions 5.0, 6.0 
 - Microsoft Visual C++, 32-bit Professional Edition, versions 5.0, 6.0 
 - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
 - Microsoft Visual C++.NET (2002) 
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SYMPTOMS
========

When compiling a Microsoft Foundation Class (MFC) application that uses the
Windowsx.h header file and calls CWnd::SubclassWindow(), you may get the
following error:

   warning C4003: not enough actual parameters for macro 'SubclassWindow' error
   C2059: syntax error : ')'

CAUSE
=====

The Windowsx.h file is a header that includes message cracker macros to help
programmers write more portable Windows-based applications. The header file
contains a preprocessor macro named SubclassWindow. The macro bears the same
name as the CWnd::SubclassWindow() member function. The macro has two
parameters; the member function has only one parameter. The preprocessor tries
to expand the symbol SubclassWindow when it is found.

RESOLUTION
==========

You can un-define the macro as follows:

      #undef SubclassWindow


STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.

REFERENCES
==========

Win32 SDK Books Online.
MFC Class Library Reference.

Additional query words: 1.00 1.50 1.51 1.52 2.00 2.10 2.20 4.00 4.10

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Keywords          : kberrmsg kbCompiler kbCPPonly kbMFC kbVC100bug kbVC150bug kbVC151bug kbVC152bug kbVC200bug kbVC210bug kbVC220bug kbVC400bug kbVC410bug kbVC420bug kbVC500bug kbVC600bug kbGrpDSMFCATL 
Technology        : kbVCsearch kbVC400 kbAudDeveloper kbvc150 kbvc100 kbVC220 kbVC410 kbVC420 kbVC500 kbVC600 kbVC151 kbVC200 kbVC210 kbVC32bitSearch kbVC152 kbVC152a kbVCNET kbVC500Search
Version           : :1.0,1.5,1.51,1.52,1.52a,2.0,2.1,2.2,4.0,4.1,4.2,5.0,6.0
Issue type        : kbbug

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