[fpc-pascal] cross platform version of IsCharAlpha()

Florian Klaempfl florian at freepascal.org
Mon Jan 12 11:49:29 CET 2009

Graeme Geldenhuys schrieb:
> Hi,
> IsCharAlpha() is a Win32 API call.  I'm trying to convert code that
> uses that call, to be Windows and Linux compatible. Does FPC have a
> cross-platform version of that API call?  I did a text search through
> the RTL of v2.2.3 and it only seems to have the Windows API version.
> I can add a Linux specific function like this in my code, but as the
> comment says, it is very primitive and clearly not ideal!
> function IsCharAlpha(AChar: Char): Boolean;
> begin
>   // This is very primitive and doesn't take special chars or unicode into
>   // consideration.
>   if AChar in ['a'..'z', 'A'..'Z'] then
>     Result := True
>   else
>     Result := False;
> end;
> Anybody got a better Object Pascal version of IsCharAlpha() I can use
> and that we can add into Free Pascal?

Add a new entry to the widestring manager, add a implementation to
sysutils using the widestring manager. Implement it in the cwstrings for
unix and sysutils directly for windows, for unix you can use iswalpha:


Create a test and submit a patch :)

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