windows系统中得到精确到微妙的时间

#include <windows.h>
#include <iostream>

  LARGE_INTEGER t1,t2,feq; 
  QueryPerformanceFrequency(&feq);//每秒跳动次数
  QueryPerformanceCounter(&t1);//测前跳动次数 
  for(int i = 0;i<10000;i++);
  QueryPerformanceCounter(&t2);//测后跳动次数
  double d=((double)t2.QuadPart-(double)t1.QuadPart)/((double)feq.QuadPart);//时间差秒
  std::cout<<d<<std::endl;