Thanks a lot :-) You saved my day!
I don't know why I did not think of the nsIDOMHTML* classes. All my
attention was on the nsIDOM* classes.
Anyway if others need this, simply do something like the following:
#include <nsIDOMHTMLFrameElement.h>
....
nsCOMPtr<nsIDOMHTMLFrameElement> piFrame;
piFrame = do_QueryInterface( pPointerToDomNodeThatCouldBeAFrame );
if ( piFrame ) {
nsCOMPtr<nsIDOMDocument> pIDOMDocument;
piFrame->GetContentDocument( getter_AddRefs(pIDOMDocument) );
}
// Now pIDOMDocument should be the root document/node of the frame.
-Martin
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