Re: GdkPixmap and GtkDrawingarea

beer wrote:

I try to draw something by use Pixmap and Drawing area but I get some problem.
What is cause of problem?
How can I fix it?
Please tell me, thank you very much.

Poblem is

1) Gdk-CRITICAL **: file gdkdraw.c: line 90 (gdk_draw_rectangle): assertion `gc != NULL' failed.

   error 1) occur when I call this function

gdk_draw_rectangle (attr->proc_name, window1->yle->white_gc, TRUE, 0, 0,

2) Gdk-CRITICAL **: file gdkgc.c: line 51 (gdk_gc_new_with_values): assertion `window != NULL' failed.

3) Gdk-CRITICAL **: file gdkgc.c: line 456 (gdk_gc_set_foreground): assertion `gc != NULL' failed.

   error 2) 3) occur when I call this functions

   gc = gdk_gc_new (window1->window);
   gdk_gc_set_foreground (gc, c);

4) Gdk-ERROR **: BadMatch (invalid parameter attributes)
  serial 194 error_code 8 request_code 62 minor_code 0

 error 4) occur when I call this function

 gdk_draw_pixmap (area->proc_name->window, window1->style->black_gc,
                     attr->proc_name, 0, value_v, 0, 0, proc_w, proc_h);


You have to be sure that your widget (GtkDrawingArea) was realized.
If not - all gdk stuff inside it is not allocated.
The simpliest way is to call gtk_widget_show(area) after area creation
(before all your drawlings).


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