golang windows idle time (键盘鼠标的空闲时间)

最近使用golang开发windows服务，需要获取idle time，由于资料比较少，在此记录，代码如下：

package osapi

import (
	"syscall"
	"unsafe"

	"github.com/lxn/win"
)

// last input info
var lastInputInfo struct {
	cbSize uint32
	dwTime uint32
}

// get idle time
func GetIdleTime() int64 {
	lastInputInfo.cbSize = uint32(unsafe.Sizeof(lastInputInfo))

	// load user32.dll , Kernel32.dll only once
	user32 := win.MustLoadLibrary("user32.dll")
	kernal32 := win.MustLoadLibrary("Kernel32.dll")

	getLastInputInfo := win.MustGetProcAddress(user32, "GetLastInputInfo")
	getTickCount := win.MustGetProcAddress(kernal32, "GetTickCount")

	tickCount, _, _ := syscall.Syscall(getTickCount, 0, 0, 0, 0)
	res, _, _ := syscall.Syscall(getLastInputInfo, 1, uintptr(unsafe.Pointer(&lastInputInfo)), 0, 0)
	if res == 0 {
		panic("get idle time error")
	}
	result := int64((int64(tickCount) - int64(lastInputInfo.dwTime)) / 1000)
	var idleTime int64 = 0
	if result > 0 {
		idleTime = result
	}
	return idleTime
}