golang windows 判断锁屏

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golang windows 判断是否锁屏：

package osapi

import (
    "syscall"
    "unsafe"

    "github.com/lxn/win"
)

const (
    DESKTOP_SWITCHDESKTOP = 0x0100 // The access to the desktop
)

// get desktop locked status
func ScreenIsLocked() bool {

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

    openDesktop := win.MustGetProcAddress(user32, "OpenDesktopW")
    closeDesktop := win.MustGetProcAddress(user32, "CloseDesktop")
    switchDesktop := win.MustGetProcAddress(user32, "SwitchDesktop")

    var lpdzDesktopPtr uintptr = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("Default"))) //string
    var dwFloatsPtr uintptr = 0                                                               //uint32
    var fInheritPtr uintptr = 0                                                               //boolean
    var dwDesiredAccessPtr uintptr = uintptr(DESKTOP_SWITCHDESKTOP)                           //uint32

    r1, _, _ := syscall.Syscall6(openDesktop, 4, lpdzDesktopPtr, dwFloatsPtr, fInheritPtr, dwDesiredAccessPtr, 0, 0)
    if r1 == 0 {
        panic("get desktop locked status error")
    }

    res, _, _ := syscall.Syscall(switchDesktop, 1, r1, 0, 0)
    // clean up
    syscall.Syscall(closeDesktop, 1, r1, 0, 0)

    return res != 1
}

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