unresponsive modeless dialogs

This is a discussion on unresponsive modeless dialogs within the Windows Programming forums, part of the Platform Specific Boards category; hi all, I have a modeless dialog that isn't responding to the mouse. Presumably, i've not tied it into the ...

  1. #1
    Registered User
    Join Date
    Oct 2003
    Posts
    50

    unresponsive modeless dialogs

    hi all,

    I have a modeless dialog that isn't responding to the mouse. Presumably, i've not tied it into the messaging loop properly somewhere, but I can't work out where.

    I have created the modeless dialog with CreateDialog(...)

    The dialog has its own message handler, which handles WM_INIT and one app message defined as WM_USER+1 and otherwise returns (INT_PTR)false.

    I have modified my message loop:
    Code:
    GetMessage(&msg, NULL, 0, 0);
    if(!IsDialogMessage(hStatusDlg, &msg))
    {
    	TranslateMessage(&msg);
    	DispatchMessage(&msg);
    }
    hStatusDlg is a valid handle to the modeless dialog.


    If i send the app defined message to it, it makes some updates its members as expected.

    Does anyone have any ideas what i've missed?

    thanks,

  2. #2
    erstwhile
    Join Date
    Jan 2002
    Posts
    2,227
    From what you've posted, it seems you've omitted the looping feature of the 'message loop':
    Code:
    while (GetMessage(&msg, 0, 0, 0)>0)
    {
      if(!IsDialogMessage(hStatusDlg, &msg))
      {
    	TranslateMessage(&msg);
    	DispatchMessage(&msg);
      }
    }
    Last edited by Ken Fitlike; 05-04-2006 at 01:10 PM. Reason: typos
    CProgramming FAQ
    Caution: this person may be a carrier of the misinformation virus.

  3. #3
    Registered User
    Join Date
    Oct 2003
    Posts
    50
    oops, sorry. bad post.

    i'm actually using a idle time message loop

    Code:
    while(!done)
    	{	
    		if(PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE))
    		{
    			if ( msg.message == WM_QUIT )
                     done = TRUE;
    			else
    			{
    				GetMessage(&msg, NULL, 0, 0);
    				if(!IsDialogMessage(hStatusDlg, &msg))
    				{
    					TranslateMessage(&msg);
    					DispatchMessage(&msg);
    				}
    			}
    		}
    		else
    		{
    			//wait until the worker thread pauses itself, then upload the star positions to the graphics card
    			if(threadLink == PAUSE)
    			{
    				//note the the directX visualiser is cpu efficient - this memcpy and the buffer filling above is almost
    				//the only load put on the cpu by the vis
    
    				//give the data to the visualiser
    				visualiser.Update(visBuffer);
    				//have the visualiser render
    				visualiser.Render();
    
    				threadLink = ITERATE;	//tell the worker thread to resume
    			}
    
    			SendMessage(hStatusDlg, UM_UPDATE, 0, 0);
    
    			Sleep(0);	//surrender the rest of the timeslice after one iteration, so that the app (and rest of the system)
    						//still respond to the user
    		}
    	}
    (its an n-body spiral galaxy evolution simulation, hence the references to stars and directX visualisations)

  4. #4
    Registered User
    Join Date
    Oct 2003
    Posts
    50
    As expected, I was being a donut. I had set the dialog as disabled in the resource editor by mistake which of course meant it quite rightly didn't respond to user input and locked out the app.

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