Windows下測量cpu利用率的類

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方法參考網上的一段代碼，把它改成了類以方便調用，很簡單，但是可以一用，哈哈。

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) {}void CpuUsage::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 initint CpuUsage::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_;    int use_rate = (interval - (ul_sys_idle.QuadPart - cpu_idle_time_)) * 100 / interval;    cpu_time_ = ul_sys_kernel.QuadPart + ul_sys_user.QuadPart;    cpu_idle_time_ = ul_sys_idle.QuadPart;    return use_rate;}

 

Windows下測量cpu利用率的類