an absolute filename specified in the GLib file name encoding, which is the on-disk file name bytes on Unix, and UTF-8 on Windows
A UTF-8 encoded hostname, or %NULL for none.
Return: a newly-allocated string holding the resulting URI, or %NULL on an error.
GException on failure.
Converts an absolute filename to an escaped ASCII-encoded URI, with the path component following Section 3.3. of RFC 2396.