Q90415: Suppressing the "Invalid Input" Error Message in FoxPro

Article: Q90415
Product(s): Microsoft FoxPro
Version(s): MACINTOSH:2.5b; MS-DOS:2.0,2.5,2.5a; WINDOWS:2.5,2.5a,3.0
Operating System(s): 
Keyword(s): 
Last Modified: 02-FEB-2000

-------------------------------------------------------------------------------
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, 2.5a 
- Microsoft FoxPro for Windows, versions 2.5, 2.5a 
- Microsoft FoxPro for Macintosh, version 2.5b 
-------------------------------------------------------------------------------

SUMMARY
=======

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 query words: VFoxWin FoxMac FoxDos FoxWin prompt

======================================================================
Keywords          :  
Technology        : kbHWMAC kbOSMAC kbVFPsearch kbAudDeveloper kbFoxproSearch kbZNotKeyword3 kbFoxPro250bMac kbFoxPro200DOS kbFoxPro250DOS kbFoxPro250aDOS kbFoxPro250 kbFoxPro250a kbVFP300
Version           : MACINTOSH:2.5b; MS-DOS:2.0,2.5,2.5a; WINDOWS:2.5,2.5a,3.0

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1986-2002.