//利用win32 API QueryPerformanceFrequency与QueryPerformanceCounter,可以更精确精确的计算,例如拿来测试,网络抓包的精确分析
#include
#include
#include
using namespace std;
int main() {
LARGE_INTEGER lv,lv_b;
// 获取每秒多少CPU Performance Tick
QueryPerformanceFrequency( &lv );
// 转换为每个Tick多少秒
double secondsPerTick = 1.0 / lv.QuadPart;
QueryPerformanceCounter( &lv_b );
for ( size_t i = 0; i < 100; ++i ) {
// 获取CPU运行到现在的Tick数
QueryPerformanceCounter( &lv );
cout.precision( 6 );
// 计算CPU运行到现在的时间
// 比GetTickCount和timeGetTime更加精确
LONGLONG duration = lv.QuadPart-lv_b.QuadPart;
double timeElapsedTotal = secondsPerTick * duration;
cout << fixed << showpoint << timeElapsedTotal << endl;
//printf( "%lf \n", timeElapsedTotal ) ;
}
return 0;
}
更精确的获取时间的方法
最新推荐文章于 2020-03-04 18:26:37 发布