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