You already know about
GetPrivateProfileString
and
WritePrivateProfileString
from the answer of
gtest_vs.
You can find examples on this functions in
MSDN.
Also consider using a helper library or class instead of raw APIs. This can simplify things a lot.
For example you can use
this INI Reader\Writer class[
^] from
CodeProject.
It comes in different versions for different platforms.
With a simple search you can find more classes and libraries like this.