StackOverflow2013

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POCasting ClutterActor* to ClutterStage*
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copied!<p>I am exploring the possibility of creating a Clutter binding for the D language ( <a href="http://d-programming-language.org/" rel="nofollow">http://d-programming-language.org/</a>) and have started by trying some simple tests using dynamic loading of libclutter. I've run into a problem that might derive from the GObject inheritance system, and I'd appreciate any help getting it figured out. Here's the rundown: using clutter_stage_get_default returns a ClutterActor* which I can use with the clutter_actor_* methods. But I always get errors or segfaults when I use the clutter_stage_* or clutter_container_* methods. Here's my test code: <a href="http://pastebin.com/nVrQ69dU" rel="nofollow">http://pastebin.com/nVrQ69dU</a></p> <p>At the clutter_container_add_actor call on line 56, I get the following error: <code>(<unknown>:11976): Clutter-CRITICAL **: clutter_container_add_actor: assertion 'CLUTTER_IS_CONTAINER (container)' failed</code></p> <p>In example code, I have noticed the CLUTTER_STAGE and CLUTTER_CONTAINER macros for casting (these obviously are not available to me), but as far as I could tell, they simply performed some checks, then did a plain C cast. If this is incorrect, and some Gobject type magic needs to be done on the stage pointer before casting, please let me know. Binding and using the clutter_stage_set_title or clutter_stage_set_color with <code>cast(ClutterStage*)stage</code> resulted in segmentation faults, presumably the same issue.</p> <p>EDIT: Here's a <a href="http://pastebin.com/E4LANPNF" rel="nofollow" title="stripped down example">stripped down example</a> with no external dependencies (if you're not on Linux, you'll need to replace the dl calls with your OS's equivalents). This code fails with a segfault, which according to GDB and Valgrind, is in <code>clutter_stage_set_title (in /usr/lib/libclutter-glx-1.0.so.0.600.14)</code></p>

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