>             nsCString charset;
>             nsCOMPtr<nsIDocument> doc = do_QueryInterface(aDocument);
>             NS_ASSERTION(doc, "Need a document");
>             nsCString charset= doc->GetDocumentCharacterSet();

Is there a reason you're not using the DOM API here instead of the
more-or-less internal nsIDocument interface? If you were, you'd be
getting back an nsAString and shouldn't have any problems, right?

-Boris
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