Re: How to get a Drawing area image as a file (BMP).

[muppet <scott asofyet org>]

This list is for discussion of the development of the gtk+ toolkit  
itself.  Questions about using gtk+ should go to gtk-app-devel- 
list gnome org 

On May 2, 2006, at 3:34 AM, sadhees kumar wrote:
> pixbuf = gdk_pixbuf_get_from_drawable(NULL,GTK_DRAWABLE 
> (da_setting_ff)->window,
In gtk+ there is no such macro as GTK_DRAWABLE().  Are you sure this  
code was not GDK_DRAWABLE(da_setting_ff->window) ?  (If not, then  
that's probably your bug.)


>                              The above code was not working, I got  
> an error saying something like "src != NULL failed". I would like  
> to know whats wrong in that. Is there any other means to get the  
> drawing area in to the pixbuf?.If so please let me know.

The exact text of the assertion will tell you in which function the  
assertion failed.  This information is rather important, because it's  
impossible to tell from the code you posted which line is the one  
with the problem.  The most likely candidate is  
gdk_pixbuf_get_from_drawable() (a quick check of the source says that  
its drawable argument is called "src"), but you realize the drawing  
area immediately before the call so the source drawable should not be  
NULL.

You can also try running the program in the debugger, with the extra  
argument "--g-fatal-warnings".  This parameter, handled and stripped  
from argv by gtk_init(), tells GLib that it should abort the program  
on warning messages, such as the one one from the assertion.  By  
running in the debugger with this option on, you should be dropped  
into the abort() frame, from whcih  you can poke around and find how  
who passed a NULL "src" and, possibly why.


--
However, like all drugs, PANEXA can produce some notable side  
effects, all of which are probably really, really terrific and  
nothing that anyone should be concerned about, let alone notify any  
medical regulatory commission about.
  -- http://www.panexa.com