S_OK

Returned if parsing is successful.

E_INVALIDARG

Returned if varInputis not a recognized input source.

Other

Parser error code or the code returned by the custom error handler.

The application can use this method to instruct the reader to begin parsing a document from a variety of sources. Supported VARIANT types are VT_BSTR, SafeArray of bytes ( VT_ARRAYVT_UI1), VT_UNK(IStream), and VT_UNK(ISequentialStream). One-level referencing is also permitted.

	Copy Code
VT_BYREF | VT_VARIANT d VT_BYREF | VT_VARIANT -> VT_BSTR VT_BYREF | VT_VARIANT -> IStream VT_BYREF | VT_VARIANT -> VT_ARRAY|VT_UI1

An application cannot invoke this method while parsing is in progress. Instead, it should create a new instance of the reader for each nested XML document. After parsing is complete, an application can reuse the same reader object, possibly with a different input source.

While parsing, the reader provides information about the XML document through the registered event handlers. If an error occurs during parsing, the reader calls the appropriate method of the ISAXErrorHandlerinterface. If the error handler returns anything but S_OK, parsing is aborted and the parsemethod returns the internal error that stopped the parser. Note that the error handler always returns the internal error code, even if the error handler returns a user-defined HRESULT to the parsemethod. The reader can return a number of return codes, including, but not limited to E_ACCESSDENIED, INET_E_OBJECT_NOT_FOUND, INET_E_DOWNLOAD_FAILURE, MSG_E_BADSTARTNAMECHAR, or MSG_E_MISSINGSEMICOLON.