Suppressing the "Invalid Input" Error Message in FoxPro

• 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 : FxprgGeneral
Version : MACINTOSH:2.5b; MS-DOS:2.0,2.5,2.5a; WINDOWS:2.5,2.5a,3.0
Platform : MACINTOSH MS-DOS WINDOWS
Issue type :