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For the life of me I cannot understand why this simple error checking does not work.

Case $inCRM
       $temp=GUICtrlRead($inCRM)
       msgbox(0,"Test","CRM number is " & $temp )
       if IsNumber($temp) <> 1 Then
            msgbox(0,"Error","CRM Number must be a numeric string")
       Else....

No matter what I put into the $inCRM input field I get the error message indicating it non numeric. The msgbox confirms that what I am testing for displays as numeric, but IsNumber keeps coming back not 1.

What am I missing here?

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You're missing the point. IsNumber() simply checks the internal variant data type of the variable. As mentioned, GUICtrlRead of an Input or Edit control returns a string. In this case IsNumber() will always return false. You should use the StringIs* functions to test the content of the string. So to be fair, 68852 didn't totally miss the point :)

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Thanks for the help. The $ES_NUMBER style will definitely be useful

(From a user friendliness perspective I'm thinking it would be useful if the help on GUICtrlRead said it always returned a string, rather than just "data".)

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To add to what wraithdu said you can also use Number() to convert to a number.

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Updated: 22/04/2018

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