Microsoft KB Archive/106394

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The information in this article applies to:

  • Microsoft CodeView Debugger for Windows, versions 4.0, 4.01, and 4.1
  • Microsoft CodeView Debugger for MS-DOS, versions 4.0, 4.01, and 4.1
  • Microsoft CodeView Debugger for Win32s, version 4.25
  • The Visual Workbench Integrated Debugger,
    • Microsoft Visual C++, versions 1.0, 1.5
    • *EDITOR Please do not choose this product*Microsoft Visual C++ 32-bit Edition* use 241, 265, 225, versions 1.0, 2.0


Setting a watch on a data member of a structure whose tag name is the same as the struct variable name produces an incorrect result.

This problem occurs with C++ programs in the Visual Workbench Debugger for Windows, CodeView for Windows, and CodeView for MS-DOS.

This problem occurs with C programs in the Visual Workbench Debugger for Windows NT and CodeView for Win32s.


The best solution is to not use the same name for the struct tag and the struct variable. Another option is to use the Locals window to display the data member.


Microsoft has confirmed this to be a problem in the Microsoft products listed above. This problem was fixed in Microsoft Visual C++, 32-bit Edition, version 4.0.


To reproduce the problem in the Visual Workbench debugger, compile and link the following sample as a QuickWin program or place similar code in a Windows program. If you set a watch on test, it will expand correctly in the Watch window.

The incorrect expansion is:

      int a 

The correct expansion is:

   -test = {...}
      a = 1; 

Sample Code

/* Compiler Options needed: /Od /Zi

void main()

  struct test
    int a;
  } test;


Additional query words: 1.00 1.10 1.50 2.00 4.00 4.10 tagname

Keywords : kbCodeView kbDebug kbide kbVC
Issue type : kbbug
Technology :

Last Reviewed: July 30, 2001