Creating line break in CCLabelBmFont with text file

Hi,
I have a simple code

bmlabeltext->setCString("aaaa \n ccc");

But when I try to get this text(“aaaa ccc”) from a plist file, it not works

I use the following code
arquivo->objectForKey("achieve_dialog2_off"))->getCString()

The text are showed, but line break don’t occur.

What I can do to correct that

I solved the problem

In my example I use the string “teste ”

This way is not working, but when I use the string “teste abc”, the line break works