newFile
Open a file @filename as a #GIOChannel using mode @mode. This channel will be closed when the last reference to it is dropped, so there is no need to call g_io_channel_close() (though doing so will not cause problems, as long as no attempt is made to access the channel after it is closed).
Return
A #GIOChannel on success, null on failure.
Parameters
filename
A string containing the name of a file
mode
One of "r", "w", "a", "r+", "w+", "a+". These have the same meaning as in fopen()