Q152150 - PRB: IsDigit Returns Wrong Value when Called from DLL

PRB: IsDigit Returns Wrong Value when Called from DLL

Q152150

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) 3.1
Microsoft Visual C++, 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
Issue type : kbprb
Technology : kbVCsearch kbAudDeveloper kbWin3xSearch kbvc150 kbvc100 kbSDKSearch kbWinSDKSearch kbWinSDK310 kbVC151 kbVC152