Q85496: PRB: Assertion Failed: WINAPP.CPP, APPCORE.CPP, or WINMAIN.CPP

Article: Q85496
Product(s): Microsoft C Compiler
Version(s): winnt:1.0,2.0,2.1,4.0
Operating System(s): 
Keyword(s): kbnokeyword kbMFC kbVC kbGrpDSMFCATL
Last Modified: 22-JUL-2001

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

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft C/C++ compiler for MS-DOS 
   - Microsoft Visual C++ for Windows, 16-bit edition, versions 1.0, 1.5 
   - Microsoft Visual C++, 32-bit Editions, versions 1.0, 2.0, 2.1, 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

Running a Microsoft Foundation Classes (MFC) application developed with
Microsoft C/C++ version 7.0 or Visual C++ for Windows may cause one of the
following error messages to be displayed:

  Assertion failed - <unknown application>:File winapp.cpp, Line 258

-or-

  Assertion failed - <unknown application>:File appcore.cpp, Line 602


Running a MFC application developed with Visual C++, 32-bit Edition, version 1.0
may cause the following error message to be displayed:

  Assertion failed - <unknown application>:File appcore.cpp, Line 559

Running a MFC application developed with Visual C++, 32-bit Edition, version 2.x,
may cause the following error message to be displayed:

  Assertion failed - <unknown application>:File winmain.cpp, Line 40

Running a MFC application developed with Visual C++, 32-bit Edition, version 4.0,
may cause the following error message to be displayed:

  Debug Assertion Failed!

  Program: <program_name>
  File: winmain.cpp
  Line: 34

NOTE: In Visual C++, 32-bit Edition, versions 2.0 and above, the assertion will
be followed by an Application Error.

CAUSE
=====

The assertion that fails is the check to see whether an application object
exists. Without the application object, the program cannot run.

RESOLUTION
==========

Define an object of a class derived from the CWinApp class.

MORE INFORMATION
================

An example of this error may be seen by commenting out the file scoped statement
of any MFC application that defines the CWinApp-derived object. This statement
will look similar to the following:

     CMyWinApp  MyWinApp;

where CMyWinApp is defined as follows:

     class CMyWinApp : public CWinApp
     {
        //...
     };

For an example MFC application, see the HELLOAPP sample program included with any
of the Microsoft products listed above.


Chapter 3 of the "Microsoft C Class Libraries User's Guide," provided with
Microsoft C/C++ version 7.0, and chapter 1 of the "Programming with MFC:
Overview," included in the Visual C++ Books Online, contain additional
information on CWinApp and on the fundamentals of using the Microsoft Foundation
Classes to build an application for Windows.

Additional query words: 7.00 1.00 1.50 2.00 2.10 2.50 3.00 4.00

======================================================================
Keywords          : kbnokeyword kbMFC kbVC kbGrpDSMFCATL 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:1.0,2.0,2.1,4.0
Issue type        : kbprb

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1986-2002.