Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!ames!ucsd!sdcsvax!trantor.harris-atd.com!mac
From: mac@trantor.harris-atd.com (Mike McDonald)
Newsgroups: comp.windows.x
Subject: XGrabPointer and ButtonPress
Keywords: X
Message-ID: <1481@trantor.harris-atd.com>
Date: 9 Feb 89 22:49:24 GMT
Organization: Advanced Technology Dept., Harris Corp., Melbourne, Fl.
Lines: 58


  I'm trying to write a menu using Xlib but I'm having problems 
with the XGrabPointer stuff. Here's the basic of my code:

main()
{
  ...
  XSelectInput(display, root, ButtonPressMask);
  while (!done)
    { XNextEvent(display, &event);
      switch (event.type) {
        case ButtonPress: show_menu(menu, &event);
                          break;
        ...
      }
    }
}

show_menu(menu, event)
{
  XChangeActivePointerGrab(display, ButtonPressMask | ButtonReleaseMask | PointerMotionMask, None, CurrentTime);
  map_menu(menu);
  while (!done) {
    { XNextEvent(display, &menu_event);
      switch (menu_event.type) {
        /* process menu events */
      }
    }
}

  The XChangeActivePointerGrab gets the following XError:

X Protocol error:  BadAccess, attempt to access private resource denied
  Major opcode of failed request:  30 (X_ChangeActivePointerGrab)
  Minor opcode of failed request:  0
  Resource id in failed request:  0x600006
  Serial number of failed request:  87
  Current serial number in output stream:  88

  I've tried to do an XUngrabPointer and then a XGrabPointer but that tells me the
pointer is already grabbed. I've also tried using event->time instead of 
CurrentTime with no luck. I'm running Xr11.3 on a Sun3/50 under SunOS3.5. I haven't 
gotten the patches from Expo yet if that matters.

  Can anybody tell me what stupid thing I'm doing wrong.

  Mike McDonald

  mac@trantor.harris-atd.com
  postmaster@trantor.harris-atd.com
  (407) 727-5060

  Advanced Technology Dept.
  Harris Corp.
  M.S. 3A-1912
  P.O. Box 37
  Melbourne, Florida
             32902