头文件:windows.h 函数原型:BOOL QueryPerformanceCounter(LARGE_INTEGER *ipPerformanceCount);//参数指向计数器的值,如果安装的硬件不支持高精度计时器,该参数将返回0 函数返回值:硬件不支持高精度计时器,函数返回0,否则返回非0 功能:得到高精度计时器的值(如果存在这样的计时器),精度可以达到微秒级别 辅助函数QueryP...
头文件:<windows.h> 高精度计数器 精度:1微秒,误差不超过0.5微妙(精度为1000 000/(cpu主频)微秒) #include <stdio.h> #include <windows.h> int main() { LARGE_INTEGER f; QueryPerformanceFrequency(&f);//获取内部高精度计数器的频率 double dFreq; dFreq = (double)f.QuadPart; //获取计数器的频率...
C语言中的LARGE_INTEGER 大家好,又见面了,我是你们的朋友全栈君。 LARGE_INTEGER是一个union:用于表示一个有符号整数值。结构定义如下 typedef union _LARGE_INTEGER{ struct{ DWORD LowPart, LONG HighPart }; LONGLONG QuadPart }LARGE_INTEGER; 含义是当编译器支持64位整数时使用QuadPart(64位)存取。否则分别...
QueryPerformanceCounter() 头文件: #include<windows.h> 用法举例: LARGE_INTEGER timeStartCount;LARGE_INTEGER timeEndCount;LARGE_INTEGER timeFreq;QueryPerformanceFrequency(&timeFreq);QueryPerformanceCounter(&timeStartCount);intnSleepCount=1234;Sleep(nSleepCount);QueryPerformanceCounter(&timeEndCount);doubleelaps...
头文件:<windows.h> 高精度计数器 精度:1微秒,误差不超过0.5微妙(精度为1000 000/(cpu主频)微秒) #include <stdio.h> #include <windows.h> int main() { LARGE_INTEGER f; QueryPerformanceFrequency(&f);//获取内部高精度计数器的频率 double dFreq; ...
LARGE_INTEGER是一个数据类型,用于表示一个64位的有符号整数。它通常用于处理大型整数值,例如文件大小、内存大小等。LARGE_INTEGER的作用是提供了一种在C语言中表示大整数的方式,可...
LARGE_INTEGER ft; ft.QuadPart = -(10 * usec); timer = CreateWaitableTimer(NULL, TRUE, NULL); SetWaitableTimer(timer, &ft, 0, NULL, NULL, 0); WaitForSingleObject(timer, INFINITE); CloseHandle(timer); } int main() { float A = 0, B = 0; ...
LARGE_INTEGER CreationTime; } OBJECT_BASIC_INFORMATION, *POBJECT_BASIC_INFORMATION; typedef struct _OBJECT_TYPE_INFORMATION { UNICODE_STRING TypeName; ULONG TotalNumberOfHandles; ULONG TotalNumberOfObjects; WCHAR Unused1[8]; ULONG HighWaterNumberOfHandles; ...
LARGE_INTEGER CreationTime; } OBJECT_BASIC_INFORMATION, *POBJECT_BASIC_INFORMATION; typedef struct _OBJECT_TYPE_INFORMATION { UNICODE_STRING TypeName; ULONG TotalNumberOfHandles; ULONG TotalNumberOfObjects; WCHAR Unused1[8]; ULONG HighWaterNumberOfHandles; ...
LARGE_INTEGER frequency, start, end; double elapsed_time; // 获取系统时钟频率(每秒计数次数) QueryPerformanceFrequency(&frequency); QueryPerformanceCounter(&start); // 获取起始时间 // 执行需要计时的代码 for (int i = 0; i < 1000000; i++) { ...