PRB: IsDigit Returns Wrong Value when Called from DLL

ID: Q152150

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) 3.1
Microsoft Visual C++ for Windows, 16-bit edition, versions 1.0, 1.5, 1.51, 1.52

SYMPTOMS

Under Windows 3.1 or Windows 95, when IsDigit() is called in a DLL, it returns TRUE if the characters are 240 and 248. IsDigit should return FALSE for these characters.

RESOLUTION

You can use SDK APIs instead of the C Run-time calls to avoid this problem.

Instead of calling:


   if (IsDigit(a))

you can call the following line to get the correct result:


   if (IsCharAlphaNumeric(a) && (!IsCharAlpha(a)))

Additional query words: MSVC


Keywords          : kb16bitonly kbIntlDev 
Version           : 1.0 1.5 1.51 1.52 3.1
Platform          : WINDOWS 
Issue type        : kbprb

Last Reviewed: August 3, 1999