what are gtk-critical errors?

[Peter Jay Salzman <p dirac org>]

hola,

i often see errors that look like:

   Gtk-CRITICAL **: file gtkpixmap.c: line 97 (gtk_pixmap_new): assertion
   `val != NULL' failed.

at this point, i realize they're harmless.  but i'm still curious about
what causes them.  what's the usual cause for errors like this?

are they mostly caused by not properly casting an object when passed as
a function argument, like:

   gtk_signal_connect(
      button,
      "clicked",
      callback_function,
      allback_data
   );

instead of:

   gtk_signal_connect(
      GTK_OBJECT(button),
      "clicked",
      GTK_SIGNAL_FUNC(callback_function),
      callback_data
   );


pete

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