XPost: alt.windows7.general, comp.os.ms-windows.programmer.win32   
   From: jj4public@outlook.com   
      
   On Thu, 14 Nov 2024 08:54:14 +0100, R.Wieser wrote:   
   > Hello all,   
   >   
   > Maybe a bit of an esoteric problem, but one I would want to have solved   
   > nonetheless:   
   >   
   > I've got a program which puts up a settings dialog (using CreateDialog).   
   > From this settings dialog I would like to send notifications (WM_NOTIFY) to   
   > its parent.   
   >   
   > The problem is, the NMHDR structure expects the "idFrom" field (the control   
   > ID) to be filled in, and I can't find it (IDD_SETTINGS, as provided to the   
   > CreateDialog call) stored anywhere. :-|   
   >   
   > Question:   
   >   
   > Is it stored anywhere in the dialog, and if so, where ?   
      
   It's stored within each window itself. Window ID is not a dialog-specific   
   property. It's a property which exist in all windows. But window ID is   
   mainly used for controls. It's rarely used for non-parented windows.   
      
   > Secondary question:   
   >   
   > Will using SetWindowLong with the GWL_ID argument on a Dialog window create   
   > any problems (does anything else use that field) ?   
   >   
   > Regards,   
   > Rudy Wieser   
      
   Dialogs use a set of predefined window IDs; at least for OK and Cancel   
   buttons. Common dialogs use more of them, including controls which are not   
   buttons. So it's best to avoid using their IDs to avoid disrupting or   
   unexpectedly triggering the dialog's default behaviour.   
      
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