Re: [gnomemm] Writing the contentes of Gnome::Canvas to a file

[ERDI Gergo <cactus cactus rulez org>]

On Thu, 20 Feb 2003, Sergio Pascual wrote:

> I'm tryng to write the contentes of a Gnome::Canvas::Canvas to a image 
> file.

You can get a pixbuf from a drawable by using the appropriate
Gdk::Pixbuf::create() overload. To get the drawable of the canvas, use
get_window() which returns a Gdk::Window.

Of course, this involves a roundtrip to the X server so there may be a
better solution, but I don't know if you can get the backing buffer of a
GTK+ widget (since GTK+ already does double buffering, there has to be a
place on the client where widgets are rendered).

You could also try to send a synthesized expose event, but that too draws
into a GdkWindow.

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