[Vala] Need help with string

[Nicolas <c r n a wanadoo fr>]

Hi,

I try to make a little program who read in a file and take only some 
informations (like an .ini file).
My text file is like this:

[INFO]
blah
blah blah
blah blah blah

Could someone tell me how to create this kind of function ?

Thank you so much in advance,
Nicolas.