KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q131837: How to Return from an Event or Method

Article: Q131837
Product(s): Microsoft FoxPro
Version(s): WINDOWS:3.0
Operating System(s): 
Keyword(s): 
Last Modified: 15-FEB-2000

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Visual FoxPro for Windows, version 3.0 
-------------------------------------------------------------------------------

SUMMARY
=======

Sometimes, it may be necessary to exit or return from an event or method. This
article documents how to do this.

MORE INFORMATION
================

For this article, assume you have created a form that requires at least one
parameter. When the form is run without being passed a parameter, you'd like to
cancel the form and issue an error message.

In version 2.x, you could do this with the RETURN command. In Visual FoxPro, the
process is similar but somewhat different because you must return a value of
false from the INIT method. The following code shows how to handle this type of
a situation in the INIT code of a form.

    PARAMETER tnMyParm
    IF PARAMETERS() < 1 OR EMPTY(tnMyParm)
         * Display a message
         * Release the form
         RETURN .F.
    ENDIF
    More init code ...

Returning a value of false (.F.) prevents the creation the object (a form in this
case).

Additional query words: VFoxWin cancel event

======================================================================
Keywords          :  
Technology        : kbVFPsearch kbAudDeveloper kbVFP300
Version           : WINDOWS: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.