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From: mouse@LARRY.MCRCIM.MCGILL.EDU
Newsgroups: comp.windows.x
Subject: Re:  Crash in XGrabpoiter X11R4
Message-ID: <9010040611.AA07661@Larry.McRCIM.McGill.EDU>
Date: 4 Oct 90 06:11:57 GMT
Sender: root@athena.mit.edu (Wizard A. Root)
Organization: The Internet
Lines: 45

> I am runnign X11R4 under SunOs 4.1.  When I make a call to
> XGrabPoiter I get the following X error message:

> X windows Protocol error: BadValue (integer parameter out of range for operation)
>      Major opcode of failed request:  26
>      Minor opcode of failed request: 0
>      Resource id in failed request: 0x8038
>      Serial number of failed request: 553

> Here's the actual call:
>  XGrabPointer(dpy, menu->menuWindow, FALSE,
>       ButtonReleaseMask | EnterWindowMask | LeaveWindowMask | ExposureMas k,
>       GrabModeAsync, GrabModeAsync, None, None, CurrentTime);

What is ExposureMask doing there?  From the Xlib document, the
description of the event_mask argument is

	          Specifies which pointer events are reported to the
	          client.  The mask is the bitwise inclusive OR of
	          the valid pointer event mask bits.

From later on, in chapter 8,

	event type.  The following table lists the event category
	and its associated event type or types. The processing asso-
	ciated with these events is discussed in section 8.4.
	
	____________________________________________________________
	Event Category           Event Type
	____________________________________________________________
	Keyboard events          KeyPress, KeyRelease
	Pointer events           ButtonPress, ButtonRelease, Motion-
	                         Notify
....
	____________________________________________________________

I sure don't see Expose events (to which ExposureMask corresponds) in
the list of pointer events, so ExposureMask is an invalid bit to set in
the event_mask argument, and the server is entirely correct to
complain.

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu