// 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;}