The IXMLParser::Runmethod returns E_PENDING if it is not finished or S_OK when it reaches the end of the input. An amount of -1 means parse as much as it can get from the input stream. If the IXMLParser::PushDatamethod is being used, the IXMLParser::Runmethod returns E_PENDING until the last buffer is pushed; after that, it will return S_OK. The number given to IXMLParser::Runis just a hint. IXMLParser::Runwill still succeed even if the specified number of characters are not left in the input buffer.

If an asynchronous download was started, IXMLParser::Run(-1) will return E_PENDING; as long as the application has a message loop, the download and parsing will occur in the background as data becomes available from URLMON. IXMLParser::GetParserStatecan be checked periodically; at some point the parser will no longer return XMLPARSER_BUSY. To monitor the progress, use the IXMLParser::Loadmethod, register a new instance of IBindStatusCallback, and watch the IBindStatusCallback::OnProgresscalls.