FF_CloseForm does not send a WM_CLOSE message

[Eddy Van Esch]

I have a form and if it is closed, I do some cleaning up.
I have that 'cleaning up' function stored under the forms WM_CLOSE message handler.
It worked fine when the form was/is closed using the standard "X" in the upper right hand corner of the window.

Now I added an extra 'Close' button on the form to close it and put the FF_CloseForm function under the button, since this is the recommended FF way to close a form.
To my surprise, when pressing the 'Close' button, the cleaning up function is not executed.
Apparantly, FF_CloseForm does not generate a WM_CLOSE message.
No big deal, I generate it myself (see code below), but you just have to know it ... 

Code Select Expand


Function TBSTOCKS_CMDCLOSE_BN_CLICKED ( _
                                      ControlIndex     As Long,  _  ' index in Control Array
                                      hWndForm         As Dword, _  ' handle of Form
                                      hWndControl      As Dword, _  ' handle of Control
                                      idButtonControl  As Long   _  ' identifier of button
                                      ) As Long
        'FF_CloseForm does not send a wm_close message to the form, so I send it myself
SendMessage hWndForm, %WM_CLOSE, 0, 0       
FF_CloseForm hWndForm, %TRUE
End Function


[Eddy Van Esch]

On the other hand. Only sending the WM_CLOSE (without using FF_CloseForm) also works.
Would that be safe..?

[José Roca]

FF_CloseForm uses DestroyWindow, which sends the WM_DESTROY message. Therefore, if you use it, move the cleaning code to the WM_DESTROY message processing instead of WM_CLOSE.

[Paul Squires]

Thanks Jose

:-)

[Eddy Van Esch]

Thanks, Jose, but I need to fetch the window position and size to restore it later.
WM_DESTROY message is generated when the window is already removed, so I cannot fetch pos. and size anymore.

Maybe I should put

Code Select Expand

My_Cleanup_function
FF_CloseForm
under my 'Close' button.
And put

Code Select Expand

My_Cleanup_function
under the WM_CLOSE message.

That said, when a child form is closed by clicking the standard "X" button (or by ALT-F4), is the FF_CloseForm function then executed?

[José Roca]

> WM_DESTROY message is generated when the window is already removed, so I cannot fetch pos. and size anymore.

Wrong assumption. The window and the child controls still exist, otherwise you could not receive the message. In my editor, I save the size and placement during WM_DESTROY.

[Eddy Van Esch]

Jose, you are right.
I did this:

Code Select Expand

Function TBSTOCKS_CUSTOM ( _
                         hWndForm      As Dword, _  ' handle of Form
                         wMsg          As Long,  _  ' type of message
                         wParam        As Dword, _  ' first message parameter
                         lParam        As Long   _  ' second message parameter
                         ) As Long
Local iX, iY, iW, iH As Long

   Select Case wMsg
        Case %WM_DESTROY
            FF_Control_GetLoc( hWndForm, iX, iY )
            FF_Control_GetSize( hWndForm, iW, iH )
            MsgBox Str$(iX) + Str$(iY) + Str$(iW) + Str$(iH)
   End Select
End Function
and the coordinates are displayed when the window is closed.
I was misled by this description in the Win32 Programmer's Reference help file:

The WM_DESTROY message is sent when a window is being destroyed. It is sent to the window procedure of the window being destroyed after the window is removed from the screen.