C++获得进程CPU使用率

来源：互联网发布：安阳师范学院软件类编辑：程序博客网时间：2024/05/18 02:56

主要使用的API为 GetProcessTimes，经测试，发现和任务管理器中还是比较接近的

#include <stdio.h>  #include <Windows.h>typedef long long           int64_t;typedef unsigned long long  uint64_t;/// 时间转换static uint64_t file_time_2_utc(const FILETIME* ftime){LARGE_INTEGER li;li.LowPart = ftime->dwLowDateTime;li.HighPart = ftime->dwHighDateTime;return li.QuadPart;}/// 获得CPU的核数static int get_processor_number(){SYSTEM_INFO info;GetSystemInfo(&info);return (int)info.dwNumberOfProcessors;}int get_cpu_usage(int pid){  //cpu数量static int processor_count_ = -1;//上一次的时间static int64_t last_time_ = 0;static int64_t last_system_time_ = 0;FILETIME now;FILETIME creation_time;FILETIME exit_time;FILETIME kernel_time;FILETIME user_time;int64_t system_time;int64_t time;int64_t system_time_delta;int64_t time_delta;int cpu = -1;if(processor_count_ == -1){processor_count_ = get_processor_number();}GetSystemTimeAsFileTime(&now);HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, false, pid);if (!GetProcessTimes(hProcess, &creation_time, &exit_time, &kernel_time, &user_time)){return -1;}system_time = (file_time_2_utc(&kernel_time) + file_time_2_utc(&user_time)) / processor_count_;  time = file_time_2_utc(&now);if ((last_system_time_ == 0) || (last_time_ == 0)){last_system_time_ = system_time;last_time_ = time;return -1;}system_time_delta = system_time - last_system_time_;time_delta = time - last_time_;if (time_delta == 0)return -1;cpu = (int)((system_time_delta * 100 + time_delta / 2) / time_delta);last_system_time_ = system_time;last_time_ = time;return cpu;}int main()   {   while(1)   {  int cpu;// 参数为进程idcpu = get_cpu_usage(1120);printf("CPU使用率: %d%%\n",cpu);Sleep(500);}   return 0;}

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