[c-prog] Mouse input

[glogic20]

Hey all
Just looking for some help to take in mouse input. Im making a simple 
game using opengl and c++(visual studio 2005). I have been using 
GetKeyboardState(keys) to take in input from keyboard but id like to 
use the mouse too. Ive looked up online and cant seem to get them to 
work.. i tried MOUSEEVENTF_LEFTDOWN but im not sure if im using it 
right. Can anyone show me a simple example of taking mouse input so it 
gets the x y cordinates of the cursor?
thanks in advance
g