GdkPixmap and GdkPixbuf


after following the scribble example on the Gtk tutorial I try to save
the image produced. Looking on the documentation of GdkPixbuf I found
I could use the following which however gives me a segmentation fault
in my program.

static GdkPixmap *pixmap = NULL;
gdk_pixbuf_save(GDK_PIXBUF(pixmap), "temp.bmp", "bmp", NULL);

I know that pixmap is of type of GdkPixmap and that arg 1 of the
function must be a GDK_PIXBUF and hence the cast. But as I said I am
getting a segmentation fault. Any clues why? Or what I should do to
save the image?


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