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Mixing X and GNUstep


From: Raffael Herzog
Subject: Mixing X and GNUstep
Date: Fri, 11 Jul 2003 19:15:56 +0200

Hi,

I'm learning GNUstep programming and thought a GNUstep frontend to Xine would be a relatively easy task for a first application - except one thing, which is very special about that: Embedding Xine into a GNUstep window.

I do the following to get the information I need for Xine:

 // use XGServer dynamically -> no need to link against gnustep-back
 Class xgServer = objc_get_class("XGServer");
 IMP imp = [xgServer methodForSelector: @selector(_windowWithTag:)];
 gswindow_device_t *dev = (gswindow_device_t *)imp(xgServer,
                                                   @selector(_windowWithTag:),
                                                   [window windowNumber]);
 xineVisual.display = dev->display;
 xineVisual.screen = dev->screen;
 xineVisual.d = dev->ident;

-> is there a cleaner way? I mean, this is now really hacking in the middle of the internals of the backend... :-/

When I run the program and make Xine display its logo, it appears for a short time, but then the program segfaults:

 2003-07-11 18:41:14.598 GSXine[2915] Class: 409ded00
 2003-07-11 18:41:14.603 GSXine[2915] imp: 409b0bbc
 2003-07-11 18:41:14.606 GSXine[2915] Display: 8194890
 2003-07-11 18:41:14.609 GSXine[2915] Screen: 0
 2003-07-11 18:41:14.612 GSXine[2915] Window ID: 5800025
 Benchmarking memcpy methods (smaller is better):
         glibc memcpy() : 716135828
         linux kernel memcpy() : 682846012
         MMX optimized memcpy() : 687281104
         MMXEXT optimized memcpy() : 444966988
         SSE optimized memcpy() : 422982120
 2003-07-11 18:41:17.185 GSXine[2915] Received an untrapped event
 Speicherzugriffsfehler (core dumped)

Any ideas what's going on there? Is my idea realisable at all?


TIA,
  Raffi

--
 The difference between theory and practice is that in theory, there is
                no difference, but in practice, there is.

Raffael Herzog - address@hidden - http://www.raffael.ch - ICQ #67961355





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