Need help fixing my game timer FPS function

This is my code, the result says 0.0f for fps and i am not sure why
BTW i know about
QuerryPerformaceCounter
GetTickCount
i just wanted to try to calculate the FPS with this function

Code:

---

MSG msg;

        static float lastTime = (float)timeGetTime();

    while(msg.message != WM_QUIT)
    {
        if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
                else
                {
        //if(msg.message == WM_QUIT)
        //    break;

       
                float currTime  = (float)timeGetTime();
        float timeDelta = (currTime - lastTime)*0.001f;
       
                render_frame(timeDelta);
     
                lastTime = currTime;

        if(KEY_DOWN(VK_ESCAPE))
            PostMessage(hWnd, WM_DESTROY, 0, 0);
                }
    }

---

Code:

---

void CalcFPS(float timeDelta)
{
 
  float FrameCount;
  float FPS;
  static float TimeElapsed;
  char outBuffer[64];

  FrameCount++;

 
 
  TimeElapsed += timeDelta;

  if (TimeElapsed>=1.0f)
  {
    FPS=(float)FrameCount/TimeElapsed;
    TimeElapsed=0.0f;
    FrameCount=0;
  }

  SetRect(&TextBox, 0, 80, 640, 480);
  sprintf(outBuffer,"FPS = %f",FPS);
  dxfont->DrawTextA(NULL,
                      outBuffer,
                      strlen(outBuffer),
                      &TextBox,
                      NULL,//DT_CENTER | DT_VCENTER,
                      D3DCOLOR_ARGB(255, 255,0, 0));

}

---

That counter will only change every second. Instant frame rate is 1.0f / frameDelta. I do not recommend you use timeGetTime(). It has a default period of about 5ms and if you do not call timeBeginPeriod() timeEndPeriod() you will be way off in your calculations.

Code:

---

LARGE_INTEGER perfFreq;
LARGE_INTEGER curTime;
LARGE_INTERGER prevTime;

QueryPerformanceCounter(&perfFreq);
float freqRatio = 1.0f / perfFreq.QuadPart;
QueryPerformanceCounter(&prevTime);

while (gameActive)
{
  QueryPerformanceCounter(&curTime);

  while (PeekMessage(&msg,0,0,0,PM_REMOVE))
  {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
  }

  float frameDelta = (curTime.QuadPart - prevTime.QuadPart) * freqRatio;

  float FPS = 1.0f / frameDelta;
  Engine.Update(frameDelta);
  Engine.Render();

  prevTime = curTime
}

---

how do i do this so it outputs correctly
sprintf(outBuffer,"FPS = %f",Delta);

am i suppose todo maths stuff with FPS or frameDelta now
like vTurn += vTurn * Speed * frameDelta or FPS?

frameDelta is used for calculations since it represent the time between frame X and X + 1. FPS is a measure of how many frames you draw in one frame and is primarily used for statistics and performance measurement...although there are far more measurements that are more helpful. FPS is the result and is only one side of the story.

If you do not know how to use sprintf I would recommend sidelining the game for a bit and concentrate on learning the language.