【Windows API】使用QueryPerformanceFrequency获取高精度时间差

LARGE_INTEGER	SystemFrequency, StartTime, StopTime;
double          dbDuration;

QueryPerformanceFrequency(&SystemFrequency);
QueryPerformanceCounter(&StartTime);

//需要计算时间差的代码

QueryPerformanceCounter(&StopTime );
dbDuration = (double)(StopTime.QuadPart - StartTime.QuadPart) / (double)SystemFrequency.QuadPart;