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Refreshing the dialog's appearance

Posted on 2002-07-19
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Last Modified: 2013-11-20
I have a very standard dialog box.  The InitDialog posts a WM_USER +1 message before returning, the WM_USER +1 message is handled bya function that goes around in a loop, at the end of which CDialog::OnCancel is called to dispose the dialog box altogether.

During each cycle of the loop I want the dialog box to refresh its look (i.e. process WM_PAINT properly), I can't get this to happen, though.

Any suggestions?

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Question by:trabar
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3 Comments
 
LVL 8

Expert Comment

by:fl0yd
ID: 7166111
Think about what's happening here:
* the dialog is created and initialized
* WM_USER + 1 -msg is posted
* WM_USER + 1 -msg is handled in function fxn
* fxn runs in a loop before
* destroying the dialog
Even if you called InvalidateRect( NULL, FALSE ); and thus posted WM_PAINT-messages to the dialog message queue you are unable to handle them until fxn has returned. When it does, though, the dialog has already been destroyed.

You have two solutions: Either use multithreading which I would discourage in this case or redesign this awkward approach. Whenever something seems too complex it is probably wrong. Without knowing too much about this specific situation I would assume that your approach isn't exactly what I'd call feasable.
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LVL 4

Accepted Solution

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mblat earned 300 total points
ID: 7166126
Or as an alternative you can try to force-process messages inside you loop.

put something like this here

while(bMyBeryLongLoop)
{
     MSG rMsg;
     while (::PeekMessage(&rMsg,0,0,0,PM_NOREMOVE)){
        AfxGetApp()->PumpMessage();
   
     // and do you stuff here....
  }
}

I don't really like this type of coding, but it works...
Hope it helps...
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LVL 4

Expert Comment

by:mblat
ID: 7167192
Just wondering why did you grade this B?
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