PRB: Form Not Released from Menu Pad or ON KEY LABEL

ID: Q156238

The information in this article applies to:

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

SYMPTOMS

A form released from a procedure or command called from a menu or an ON KEY LABEL command is not actually released until the command or procedure has completed.

WORKAROUND

Set the Visible property of the form to .F. - False to hide the form until the procedure that releases it has finished executing.

STATUS

This behavior is by design.

MORE INFORMATION

The Keypress event of the form intercepts the keystroke, and the form cannot be released until the procedure or command called by the keystroke has completed.

Steps to Reproduce Behavior

Run the following code from a .prg:


   ON KEY LABEL F3 DO Release_It
   oForm = CREATEOBJECT('form')
   oForm.Caption = "Press F3 to release form, then F3 to Clear Events"
   oForm.SHOW()
   READ EVENTS
   ON KEY LABEL F3

   PROCEDURE Release_It
       oForm.RELEASE
       =MESSAGEBOX("Though form has been released, _SCREEN.Formcount = " ;
         + ALLTR(STR(_SCREEN.FORMCOUNT,1)) + ". Press F3 after OK to " ;
         + "return to Command Window." ,0)
       ON KEY LABEL F3 CLEAR EVENTS
   ENDPROC

Press the F3 key. The message box indicates the form still exists since the FormCount property of the _SCREEN system variable still returns 1.

Click OK then press F3 to return to the Command window.

Modify the Release_It procedure in the above example as follows to demonstrate the workaround. (The form is still not immediately released from memory but setting the Visible property to .F. - False makes it appear released.)


   PROCEDURE Release_It
      oForm.Visible = .F.
      oForm.RELEASE
      =MESSAGEBOX("Though form has been released, _SCREEN.Formcount = " ;
        + ALLTR(STR(_SCREEN.FORMCOUNT,1)) + ". Press F3 after OK to " ;
        + "return to Command Window." ,0)
      ON KEY LABEL F3 CLEAR EVENTS
   ENDPROC

Additional query words: kbdse VFoxWin

Keywords : FxtoolFormdes
Version : WINDOWS:3.0,3.0b,5.0,6.0
Platform : WINDOWS
Issue type :