How to write to a file in a DirectX11 Windows 8 Game

[Nekusta]

So basically I need to write a few variables from here and there to a text file and save it for a DirectX Win8 game. Can someone explain a little how to write a save function? There are the WriteDataAsync() and WriteData() function in the BasicReaderWriter.cpp file that I'm using but I'm having trouble actually using these functions to write to a file. Any help? A tutorial or something where they actually explain how to write to a file using this class.