Tk_CreateClientMessageHandler(3)			       Tk Library Procedures				  Tk_CreateClientMessageHandler(3)

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NAME

       Tk_CreateClientMessageHandler, Tk_DeleteClientMessageHandler - associate procedure callback with ClientMessage type X events

SYNOPSIS

       #include <tk.h>

       Tk_CreateClientMessageHandler(proc)

       Tk_DeleteClientMessageHandler(proc)

ARGUMENTS

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

       Tk_CreateClientMessageHandler  arranges for proc to be invoked in the future whenever a ClientMessage X event occurs that is not 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_ClientMessageProc:
	      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 was not 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
       processing 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-created ClientMessage event handler: it deletes each	handler  it  finds
       that matches the proc argument.	If no such handler exists, then Tk_DeleteClientMessageHandler returns without doing anything.  Although Tk
       supports it, it's probably a bad idea to have more than one callback with the same proc argument.

KEYWORDS

       bind, callback, event, handler

Tk									8.4					  Tk_CreateClientMessageHandler(3)