Hi,
I'm writing an XPCOM component that, as a part of it's job, is supposed
to load an XML document and traverse the DOM. The component is supposed
to be used in a XULRunner application. I'm using the
document.implementation.createDocument to create an object implementing
the nsIDOMXMLDocument interface, and then call it's load method. The
problem is that I can not get documentElement in C++. I have a feeling
I'm doing something completely wrong here. :)
1. I tried passing the XUL document's nsIDOMDocument from JavaScript to
the component and then doing the following:
// error checking stripped
nsCOMPtr<nsIDOMDOMImplementation> docImpl;
xulDocument->GetImplementation ( getter_AddRefs(docImpl) );
nsCOMPtr<nsIDOMDocument> domDoc;
docImpl->CreateDocument ( NS_LITERAL_STRING(""),
NS_LITERAL_STRING("xmlDoc"), nsnull, getter_AddRefs(domDoc) );
nsCOMPtr<nsIDOMXMLDocument> domXmlDoc ( do_QueryInterface ( domDoc ) );
PRBool boolRes;
domXmlDoc->Load ( url, &boolRes );
nsCOMPtr<nsIDOMElement> documentElement;
domDoc->GetDocumentElement ( getter_AddRefs(documentElement) );
In this case, xmlDoc->Load returns NS_OK and boolRes has PR_TRUE, but
when I'm calling domDoc->GetDocumentElement, it returns null. However,
if I return domDoc to the calling JavaScript, I can access the
documentElement and traverse the DOM.
2. I tried loading the document in JavaScript and then passing the
loaded document's nsIDOMDocument to the component, but still
GetDocumentElement returns null. Even if I get the loaded document's
documentElement and pass it's nsIDOMElement to the component, the
component receives null even though it was non-null on JavaScript side.
What am I missing here?
Thank you,
-- Vitaly
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