the #GAsyncResult that was provided to the callback.
a #gsize to get the length of the data read in.
a string with the data that was read before encountering any of the stop characters. Set length to a #gsize to get the length of the string. This function will return null on an error.
Deprecated: Use gio.data_input_stream.DataInputStream.readUptoFinish instead, which has more consistent behaviour regarding the stop character.
Finish an asynchronous call started by gio.data_input_stream.DataInputStream.readUntilAsync.