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Windows下测量cpu利用率的类

2015-11-30 16:26 393 查看

方法参考网上的一段代码，把它改成了类以方便调用，很简单，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 init
int 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;
}

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