PRB: IsDigit Returns Wrong Value when Called from DLL

 Last reviewed: January 15, 1998
Article ID: Q152150
The information in this article applies to:
  • Microsoft Windows Software Development Kit (SDK), version 3.1
  • Microsoft Visual C++, 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

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Last reviewed: January 15, 1998
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