问在Win CE上关闭WLAN -怎么做？

EN

  [DllImport("coredll.dll", SetLastError = true)]
        private static extern int SetDevicePower(string pvDevice, int dwDeviceFlags, DevicePowerState DeviceState);

        private enum DevicePowerState : int
        {
            Unspecified = -1,
            D0 = 0, // Full On: full power, full functionality 
            D1, // Low Power On: fully functional at low power/performance 
            D2, // Standby: partially powered with automatic wake 
            D3, // Sleep: partially powered with device initiated wake 
            D4, // Off: unpowered 
        }

        private const int POWER_NAME = 0x00000001;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string driver = FindDriverKey();
            SetDevicePower(driver, POWER_NAME, DevicePowerState.D0);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string driver = FindDriverKey();
            SetDevicePower(driver, POWER_NAME, DevicePowerState.D4);
        }

        private static string FindDriverKey()
        {
            string ret = string.Empty;
            string WiFiDriverClass = "{98C5250D-C29A-4985-AE5F-AFE5367E5006}";
            foreach (string tmp in Registry.LocalMachine.OpenSubKey("\\System\\CurrentControlSet\\Control\\Power\\State", false).GetValueNames())
            {
                if (tmp.Contains(WiFiDriverClass))
                {
                    ret = tmp;
                    break;
                }
            }
            return ret;
        }
    }