GetTickCount()只能到ms,要到ns級的話等用QueryPerformance系列
如:
LARGE_INTEGER fre,begin,end;
QueryPerformanceFrequency(&fre);
QueryPerformanceCounter(&begin);
QueryPerformanceCounter(&end);
cout<<"Spend "<<(end.QuadPart-begin.QuadPart)*1000000/fre.QuadPart<<"ns"<<endl;