Go语言使用CGO获取Windows的CPU使用率

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)
}
}