[Vala] GIO get_contens

[Arley Consuegra Rosello <aconsuegra uci cu>]

Hello, I was looking the basic gio sample there a file is read line by
line.
Exist some way to read the without using a while loop?
php have a funtion get_contens that is what I need.
In gio reference manual I found g_data_input_stream_read_upto_finish
that look like what I need, but don't found it in valadoc.org

pd: Spanish user, sorry.