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Tk_CreateClientMessageHandlerTk)Library ProcedTk_CreateClientMessageHandler(3)


       Tk_CreateClientMessageHandler,  Tk_DeleteClientMessageHandler  -	 asso‐
       ciate procedure callback with ClientMessage type X events

       #include <tk.h>



       Tk_ClientMessageProc	       *proc(in) Procedure to invoke  whenever
						 a   ClientMessage   X	 event
						 occurs on any display.

       Tk_CreateClientMessageHandler arranges for proc to be  invoked  in  the
       future  whenever	 a  ClientMessage X event occurs that isn't handled by
       WM_PROTOCOL.  Tk_CreateClientMessageHandler  is	intended  for  use  by
       applications  which  need to watch X ClientMessage events, such as drag
       and drop applications.

       The callback to proc will be made  by  Tk_HandleEvent;  this  mechanism
       only  works in programs that dispatch events through Tk_HandleEvent (or
       through	other  Tk  procedures  that  call  Tk_HandleEvent,   such   as
       Tk_DoOneEvent or Tk_MainLoop).

       Proc should have arguments and result that match the type Tk_ClientMes‐
	      typedef int Tk_ClientMessageProc(
		Tk_Window tkwin,
		XEvent *eventPtr);
       The tkwin parameter to proc is the Tk window which is  associated  with
       this event.  EventPtr is a pointer to the X event.

       Whenever	 an  X ClientMessage event is processed by Tk_HandleEvent, the
       proc is called if it wasn't handled as a WM_PROTOCOL.  The return value
       from  proc  is  normally 0.  A non-zero return value indicates that the
       event is not to be handled further; that is, proc has done all process‐
       ing that is to be allowed for the event.

       If  there are multiple ClientMessage event handlers, each one is called
       for each event, in the order in which they were established.

       Tk_DeleteClientMessageHandler may be called to delete a previously-cre‐
       ated ClientMessage event handler: it deletes each handler it finds that
       matches the proc argument.  If no such handler exists, then  Tk_Delete‐
       ClientMessageHandler  returns without doing anything.  Although Tk sup‐
       ports it, it's probably a bad idea to have more than one callback  with
       the same proc argument.

       bind, callback, event, handler

Tk				      8.4     Tk_CreateClientMessageHandler(3)
                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
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