Suppressing the "Invalid Input" Error Message in FoxPro

Last reviewed: April 29, 1996
Article ID: Q90415

The information in this article applies to:

Microsoft Visual FoxPro for Windows, version 3.0
Microsoft FoxPro for MS-DOS, versions 2.0, 2.5, and 2.5a
Microsoft FoxPro for Windows, versions 2.5 and 2.5a
Microsoft FoxPro for Macintosh, version 2.5b

When Microsoft FoxPro evaluates a user-defined function (UDF) that returns the Boolean value .F., FoxPro displays the message "Invalid Input (press space)" and halts execution until you press the SPACEBAR. To suppress this error message, return the value 0 when the condition is not met.

The code example below accepts input for a screen variable called "mystate". The code calls a UDF to evaluate mystate, and displays a customized error message when the state is not equal to "WA".

   mystate=SPACE(2)
   @ 2,2 GET mystate VALID checkit()
   READ

   PROCEDURE checkit
   IF UPPER(mystate)<>"WA"
      WAIT WINDOW "MYSTATE must be equal to WA" NOWAIT
      RETURN 0
   ENDIF
   RETURN

Additional reference words: VFoxWin 3.00 FoxMac FoxDos FoxWin 2.00 2.50
2.50a prompt
KBCategory: kbprg
KBSubcategory: FxprgGeneral

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Last reviewed: April 29, 1996
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