获取进程CPU占用率

获取进程CPU占用率

 

// 时间转换
static __int64 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;
}
// 获取进程CPU占用
int get_cpu_usage(int pid)
{  //cpu数量static int processor_count_ = -1;//上一次的时间static __int64 last_time_ = 0;static __int64 last_system_time_ = 0;FILETIME now;FILETIME creation_time;FILETIME exit_time;FILETIME kernel_time;FILETIME user_time;__int64 system_time;__int64 time;__int64 system_time_delta;__int64 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;
}