Microsoft KB Archive/169484

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FIX: CString::MakeUpper and MakeLower Don't Work with Extended Characters

Article ID: 169484

Article Last Modified on 11/21/2006


  • Microsoft Foundation Class Library 4.2, when used with:
    • Microsoft Visual C++ 5.0 Enterprise Edition
    • Microsoft Visual C++ 5.0 Professional Edition
    • Microsoft Visual Studio 97 Service Pack 3

This article was previously published under Q169484


MakeUpper() and MakeLower() in Visual C++ 5.0 do not convert the extended characters, such as ,,.


MakeUpper() and MakeLower() were working correctly with the extended characters in Visual C++ 4.0, but not in Visual C++ 5.0. In Visual C++ 4.0, CString::MakeUpper() and MakeLower() functions are wrappers for the SDK functions CharUpper() and CharLower(). They work correctly for the extended characters, such as [ASCII 197],[ASCII 196],[ASCII 214]. In Visual C++ 5.0, the MakeUpper() and MakeLower() functions use the C Runtime _tcslwr and _tcsupr to convert the characters, instead of CharUpper and CharLower. As a result, the extended characters are not being converted anymore.


This problem can be avoided by using the SDK APIs CharUpper() and CharLower() instead of the CString functions.


This problem has been corrected in Visual Studio 97 Service Pack 1.

For additional information about the Visual Studio 97 Service Pack 1, please see the following article in the Microsoft Knowledge Base:

170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

Keywords: kbbug kbfix kbnoupdate kbvc500sp1fix KB169484