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Q169484: FIX: CString::MakeUpper and MakeLower Don’t Work with Some Char

Article: Q169484
Product(s): Microsoft C Compiler
Version(s): winnt:5.0
Operating System(s): 
Keyword(s): kbVC500bug kbVC500SP1fix kbGrpDSMFCATL kbNoUpdate
Last Modified: 17-JUL-2001

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0 
   - Microsoft Visual C++, 32-bit Professional Edition, version 5.0 
   - Microsoft Visual Studio 97 
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SYMPTOMS
========

MakeUpper() and MakeLower() in Visual C++ 5.0 do not convert the extended
characters, such as A (with circle accent), A or O (with umlauts). 

CAUSE
=====

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.

RESOLUTION
==========

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

STATUS
======

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:

  Q170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

Additional query words:

======================================================================
Keywords          : kbVC500bug kbVC500SP1fix kbGrpDSMFCATL kbNoUpdate 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:5.0
Issue type        : kbbug
Solution Type     : kbfix

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