WM_QUERYENDSESSION

[Scott Turchin]

I know we've covered this for evasive action before but lets say I have an option in my app to save settings prior to closing.
If someone closes the app via the X on the top right, or Windodws is shutting down, do I use WM_QUERYENDSESSION or WM_CLOSE to detect this and save my settings first?

I'm getting weird results...

Thanks,


Scott

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Scott
mailto:[email protected][email protected]</A>

[Peter Lameijn]

I,m using %WM_SYSCOMMAND, work fine for me on close or ALT-F4....

Case %WM_SYSCOMMAND
  If CbWparam = %SC_CLOSE Then                                                              'Alt-F4 not allowed!
    ' Do whatever you want to do........
  End If                                                                                    'dialog.

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Peter.
mailto[email protected][email protected]</A>

[Cecil Williams]

Scott,

When the X is clicked, or the program icon is clicked and you
select close or just alt+F4, windows sends the WM_SYSCOMMAND to
to the top level window. Just let the default procedure handle
this and a WM_CLOSE is issued back to the window.

When Windows is shutting down, the WM_QUERYENDSESSION is sent
to all top level windows that are running. Just make a procedure
that you call from the window procedure at these two messages
to do your program saves.

Cheers,
Cecil

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[Eric Pearson]

It's a very good idea to "respond" to a WM_QUERYENDSESSION as quickly as possible, and then begin your shutdown process. By returning 1 your application is telling Windows "I promise to shut down". If you don't return 1 within the Windows timeout, Windows will terminate your application "without mercy".

In other words, you should do something like this:

ELSEIF wMsg = %WM_QUERYENDSESSION THEN
 
    PostQuitMessage 0
    FUNCTION = 1

Then when your app processes the WM_QUIT that is posted by PostQuitMessage, it should shut down as quickly as possible.

(You don't have to use WM_QUIT... You could use SendMessage %WM_USER, for example.)

-- Eric

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Perfect Sync: Perfect Sync Development Tools
Email: mailto:[email protected][email protected]</A>

[This message has been edited by Eric Pearson (edited February 15, 2001).]

[Scott Turchin]

I See two issues here.
I don't want to repeat my %IDM_EXIT menu function in the event of SC_CLOSE Or WM_CLOSE (Whats' the difference?)..

So if I send a Control send cbhndl,%IDM_EXIT,%BM_CLICK,0,0 it occurs twice upon a N ORMAL ueage of %IDM_EXIT.


How do I avoid that now?


[This message has been edited by Scott Turchin (edited February 15, 2001).]

[Scott Turchin]

Think I got it, thank god for the Win32api bible

WM_CLOSE is alt-f4, SC_CLOSE is the SYSTEM COMMAND Of CLOSE, and QUERYENDSESSION is ONLY when a user is logging off the machine.

Scott

[This message has been edited by Scott Turchin (edited February 15, 2001).]

[Scott Turchin]

Yup got it! This works flawlessly and I just did a reboot to test it!
%IDM_EXIT does the file saving, user will get prompted (UNless he turned that option of hehe)

Select case CbMsg
    Case %WM_QUERYENDSESSION',%WM_CLOSE
         Control Send CbHndl, %IDM_EXIT,%BM_CLICK,0,0
         PostQuitMessage 0
         Function = %TRUE

    Case %WM_SYSCOMMAND
         Select Case CbWparam
                Case %SC_CLOSE 'SYSTSEM CLOSE
                    Control Send CbHndl, %IDM_EXIT,%BM_CLICK,0,0

         End Select

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Scott
mailto:[email protected][email protected]</A>