if you are satisfied with windowed mode, you can set the fps
as the caption. Other methods are more complicated. You should
try some NEHE tutorials about fonts.

char s[50];
sprintf(s,"FPS %f",fps); // fps is float
SetWindowText(hwnd,s); // hwnd is your window handle

thx its seems to work!
is there an easy way to control if the fps is correct?

i don''t think. You just have to compare it with other results,
which you believe are correct ;-)

I found this solution which I added to the end of my render() function.



frames++;
timeThisFrame=(int)time.GetTime()/1000;

if(timeThisFrame-timeLastFrame)
{
fps=frames;
frames=0;
}
timeLastFrame=(int)time.GetTime()/1000;

it is fairly simple and seems to work very well... then you just print the value of fps to the screen. it´ll show how many frames you had during the last second