How can I save the pixel of a GdkWindow/GdkWidget to a file?

[yinglcs aim com]

Hi,

Can someone please tell me can I save the pixel of a 
GdkWindow/GdkWidget to a file?


The only think I find is saving from a GdkDrawable (the 2 functions 
below). But how can I get a GdkDrawable from a GdkWidget/GdkWindow?

GdkPixbuf* pixBuf = gdk_pixbuf_get_from_drawable (NULL,
gd, NULL, 0, 0, 0, 0, w, h);

gdk_pixbuf_save (pixBuf, "snapshot.png", "png", &err, NULL);

Thank you.
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