求助，为何用QueryPerformanceCounter得到的结果却不对呢

haoxchen

求助，为何用QueryPerformanceCounter得到的结果却不对呢 [复制链接]

代码如下：
LARGE_INTEGER litmp;
LONGLONG QPart1,QPart2;
double dfMinus, dfFreq, dfTim;
int nReturn = QueryPerformanceFrequency(&litmp);
dfFreq = (double)litmp.QuadPart;
nReturn = QueryPerformanceCounter(&litmp);
QPart1 = litmp.QuadPart;

QueryPerformanceCounter(&litmp);
QPart2=litmp.QuadPart;
dfMinus=(double)(QPart2-QPart1);
dfTim=dfMinus/dfFreq;

两个QueryPerformanceCounter之间几乎没做什么，可是得到的dfMinus却很大很大，为什么，难道2440的板子不支持