C++ 调用Windows 计时函数

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double Millesecond()
{
  LARGE_INTEGER frequency;
  LARGE_INTEGER timeStart;
  QueryPerformanceFrequency(&frequency); // 返回每秒，cpu 所使用的时钟数   
  QueryPerformanceCounter(&timeStart);
  double dfrequency = (double)frequency.QuadPart;
  double dtimeStart = (double)timeStart.QuadPart;
  return dtimeStart * 1000.0f / dfrequency;
}