Re: GdkPixmap and GtkDrawingarea

[Olexiy Avramchenko <ath beast stu cn ua>]

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,
>                   (area->proc_name)->allocation.width,
>                   (area->proc_name)->allocation.height);
>
>  
>
> 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);
>
>  
Hello,

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).

Olexiy