getSystemId Method (C-C++)
Returns the system identifier for the current document event. A system identifier represents a file located on the local file system or network.
HRESULT getSystemId( [out, retval] const wchar_t ** ppwchSystemId);
The system identifier or Null (if none is available).
ppwchSystemId should not be modified or deleted because this can cause undefined behavior in the SAX parser. If you want to preserve the value that was returned in
ppwchSystemId, you should make a deep copy.
The value returned if the system identifier is returned successfully; Null if no system identifier is available.
Implemented in: MSXML 3.0 and later