Knowledge Base

BUG: C4003: Not Enough Parameters for SubclassWindow Macro

Article ID: 150076

Article Last Modified on 9/18/2003

APPLIES TO

This article was previously published under Q150076

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

Keywords: kberrmsg kbbug kbcpponly kbcompiler KB150076


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