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

• The Microsoft Foundation Classes (MFC) included with: - Microsoft Visual C++, 32-bit Editions, version 5.0 - Microsoft Visual Studio 97

SYMPTOMS

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

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 Å,Ä,Ö. 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:

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