Go语言使用CGO获取Windows的CPU使用率

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package main

/*
#include <windows.h>
#include <stdio.h>
#include <conio.h>

double FileTimeToDouble(FILETIME* pFiletime)
{
	return (double)((*pFiletime).dwHighDateTime * 4.294967296E9) + (double)(*pFiletime).dwLowDateTime;
}

double m_fOldCPUIdleTime;
double m_fOldCPUKernelTime;
double m_fOldCPUUserTime;


BOOL Initialize()
{
	FILETIME ftIdle, ftKernel, ftUser;
	BOOL flag = FALSE;
	if (flag = GetSystemTimes(&ftIdle, &ftKernel, &ftUser))
	{
		m_fOldCPUIdleTime = FileTimeToDouble(&ftIdle);
		m_fOldCPUKernelTime = FileTimeToDouble(&ftKernel);
		m_fOldCPUUserTime = FileTimeToDouble(&ftUser);

	}
	return flag;
}

int GetCPUUseRate()
{
	int nCPUUseRate = -1;
	FILETIME ftIdle, ftKernel, ftUser;
	if (GetSystemTimes(&ftIdle, &ftKernel, &ftUser))
	{
		double fCPUIdleTime = FileTimeToDouble(&ftIdle);
		double fCPUKernelTime = FileTimeToDouble(&ftKernel);
		double fCPUUserTime = FileTimeToDouble(&ftUser);
		nCPUUseRate= (int)(100.0 - (fCPUIdleTime - m_fOldCPUIdleTime) / (fCPUKernelTime - m_fOldCPUKernelTime + fCPUUserTime - m_fOldCPUUserTime)*100.0);
		m_fOldCPUIdleTime = fCPUIdleTime;
		m_fOldCPUKernelTime = fCPUKernelTime;
		m_fOldCPUUserTime = fCPUUserTime;
	}
	return nCPUUseRate;
}
int cpu()
{
	if (!Initialize())
	{
		getch();
		return -1;
	}
	else
	{
		Sleep(1000);
		return GetCPUUseRate();
	}
	return -1;
}

*/
import "C"

import (
	"fmt"
)

func main() {
	for {
		cpu := C.cpu()
		fmt.Printf("\r%d%%", cpu)
	}
}

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