Re: test if a string is a valid 'number'?

From:
"Tom Serface" <tom.nospam@camaswood.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 30 May 2007 15:43:15 -0700
Message-ID:
<28AB8092-B39A-4374-BB5B-DB049580EA7E@microsoft.com>
Yikes, that's a lot of work. I thought my example was too much :o)

Tom

"Ashot Geodakov" <a_geodakov@nospam.hotmail.com> wrote in message
news:O0LiOkvoHHA.5032@TK2MSFTNGP02.phx.gbl...

#include <windows.h>

typedef long ( *ISNUMERIC )( VARIANT* );

BOOL IsNumeric( LPTSTR szString )
{
   HINSTANCE hinstLib;
   ISNUMERIC ProcAdd;

   hinstLib = LoadLibrary( TEXT( "C:\\Program Files\\Common
Files\\Microsoft Shared\\VBA\\VBA6\\vbe6.dll" ) );

   if( hinstLib != NULL )
   {
       long lNumeric = 0;
       ProcAdd = (ISNUMERIC)GetProcAddress( hinstLib, "rtcIsNumeric" );

       if( NULL != ProcAdd )
       {
           VARIANT vtExpression;
           vtExpression.vt = VT_BSTR;
           vtExpression.bstrVal = SysAllocString( szString );
           __asm
           {
               lea eax, [vtExpression]
               push eax
               call (ProcAdd)
               mov lNumeric, eax
           }
           SysFreeString( vtExpression.bstrVal );
       }

       FreeLibrary( hinstLib );
       return ( lNumeric != 0 );
   }
   else return FALSE;
}

void main( void )
{
   BOOL bNumeric = IsNumeric( TEXT( "1245789.00" ) );
   bNumeric = IsNumeric( TEXT( "sdf1245789.00" ) );
   bNumeric = IsNumeric( TEXT( "+234.43E-24" ) );
   bNumeric = IsNumeric( TEXT( "12,234,345.00" ) );
   bNumeric = IsNumeric( TEXT( "sdf1245789.00" ) );
}

"WJ" <WJ@discussions.microsoft.com> wrote in message
news:B191F239-907C-4468-B8D6-B794460DF3C5@microsoft.com...

Hi,
I have a string that I want convert to a number. Before doing that, I
need
to test if the string represents a valid 'number'.

I remember there is a function to do that, but I can't find it.
(I am NOT using .net, I am using MFC)

Thanks.

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