Classes for measuring CPU utilization under windows

Method refer to a piece of code on the Web, change it to a class to facilitate the call, very simple, but can be used, haha.

Cpu_usage.h

#include <windows.h>class  cpuusage {public:    cpuusage ();     void init ();     // Get CPU Usage rate from the last invoke of the function or init    int Get (); Private :     BOOL Inited_;    ULONGLONG Cpu_time_;    Ulonglong cpu_idle_time_;};

Cpu_usage.cpp

#include"cpu_usage.h"cpuusage::cpuusage (): Inited_ (false) {}voidCpuusage::init () {FILETIME ft_sys_idle;    FILETIME Ft_sys_kernel;    FILETIME Ft_sys_user;    Ularge_integer Ul_sys_idle;    Ularge_integer Ul_sys_kernel;    Ularge_integer Ul_sys_user; Getsystemtimes (&ft_sys_idle,/*System Idle time*/&ft_sys_kernel,/*System Kernel time*/&ft_sys_user);/*System User time*/CopyMemory (&ul_sys_idle, &ft_sys_idle,sizeof(FILETIME)); CopyMemory (&ul_sys_kernel, &ft_sys_kernel,sizeof(FILETIME)); CopyMemory (&ul_sys_user, &ft_sys_user,sizeof(FILETIME)); Cpu_time_= Ul_sys_kernel. QuadPart +Ul_sys_user.    QuadPart; Cpu_idle_time_=Ul_sys_idle.    QuadPart; Inited_=true;}//Get CPU Usage rate from the last invoke of the function or initintCPUUsage::Get() {    if(!inited_)return-1;    FILETIME Ft_sys_idle;    FILETIME Ft_sys_kernel;    FILETIME Ft_sys_user;    Ularge_integer Ul_sys_idle;    Ularge_integer Ul_sys_kernel;    Ularge_integer Ul_sys_user; Getsystemtimes (&ft_sys_idle,/*System Idle time*/&ft_sys_kernel,/*System Kernel time*/&ft_sys_user);/*System User time*/CopyMemory (&ul_sys_idle, &ft_sys_idle,sizeof(FILETIME)); CopyMemory (&ul_sys_kernel, &ft_sys_kernel,sizeof(FILETIME)); CopyMemory (&ul_sys_user, &ft_sys_user,sizeof(FILETIME)); Ulonglong interval= Ul_sys_kernel. QuadPart + Ul_sys_user. QuadPart-cpu_time_; intUse_rate = (Interval-(ul_sys_idle. QUADPART-CPU_IDLE_TIME_)) * -/interval; Cpu_time_= Ul_sys_kernel. QuadPart +Ul_sys_user.    QuadPart; Cpu_idle_time_=Ul_sys_idle.    QuadPart; returnuse_rate;}

Classes for measuring CPU utilization under windows