c# 检测设备改变

    //检测硬件改变
        protected override void WndProc(ref Message m)
        {
            const int WM_DEVICECHANGE = 0x219;
            if (m.Msg == WM_DEVICECHANGE)
            {
                if(UsbDev.FindUsbDev(0x000b, 0x8888))
                {
                    //尝试打开USB
                    if (UsbConnect == true) return;//说明是其他设备活动
                    UsbConnect = UsbDev.OpenDev(0x000b, 0x8888);
                    if (UsbConnect) labelUsb.Text = "USB连接成功";
                    else labelUsb.Text = "USB连接失败";
                }
                else
                {
                    labelUsb.Text = "USB连接失败";
                    UsbConnect = false;
                }
            }  

            base.WndProc(ref m);
        }