KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q190313: PRB: Form QueryUnload Fires Before the Activate Event

Article: Q190313
Product(s): Microsoft FoxPro
Version(s): WINDOWS:3.0,3.0b,5.0,5.0a,6.0
Operating System(s): 
Keyword(s): 
Last Modified: 11-DEC-1999

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

- Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a, 6.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

Under certain conditions, the QueryUnload event of a form fires before the
Activate event. If code in the Activate event of a form takes some time to
execute, the QueryUnload event fires before the code in the Activate event.

STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products listed at
the beginning of this article. We are researching this problem and will post new
information here in the Microsoft Knowledge Base as it becomes available.

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

Steps to Reproduce Behavior
---------------------------

1. Create a form and add the following code to the Activate event of the form:

        ? "Inside the Activate event."
        *DEBUGOUT PROGRAM()
        FOR i = 1 TO 5000
              SET MESSAGE TO ALLTRIM(STR(i))
        NEXT i

2. Add the following code to the QueryUnload event of the form:

        ? "Inside the QueryUnload event."
        *DEBUGOUT PROGRAM()
        WAIT WINDOW "Inside the QueryUnload Event."

3. Run the form and click the Command window to remove focus from the form. Now,
  click the Close control to close the form. Notice that the Activate event
  fires, then the QueryUnload event fires.

4. Unremark the two DEBUGOUT commands and remark the WAIT WINDOW command. Open
  the Debugger and note that in the Output window of the Debugger the
  QueryUnload event fires after the Activate event.

Additional query words: FxprgClassoop FxtoolFormdes kbvfp600

======================================================================
Keywords          :  
Technology        : kbVFPsearch kbAudDeveloper kbVFP300 kbVFP300b kbVFP500 kbVFP600 kbVFP500a
Version           : WINDOWS:3.0,3.0b,5.0,5.0a,6.0
Issue type        : kbprb

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

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.