C#判断U盘插拔，获取盘符

C#判断U盘插拔，获取盘符

标题相关变量

        public const int WM_DEVICECHANGE = 0x219;

        public const int DBT_DEVICEARRIVAL = 0x8000;

        public const int DBT_CONFIGCHANGECANCELED = 0x0019;

        public const int DBT_CONFIGCHANGED = 0x0018;

        public const int DBT_CUSTOMEVENT = 0x8006;

        public const int DBT_DEVICEQUERYREMOVE = 0x8001;

        public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002;

        public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;

        public const int DBT_DEVICEREMOVEPENDING = 0x8003;

        public const int DBT_DEVICETYPESPECIFIC = 0x8005;

        public const int DBT_DEVNODES_CHANGED = 0x0007;

        public const int DBT_QUERYCHANGECONFIG = 0x0017;

        public const int DBT_USERDEFINED = 0xFFFF;

处理方法

protected override void WndProc(ref Message m)
        {
            try
            {
                if (m.Msg == WM_DEVICECHANGE)
                {
                    switch (m.WParam.ToInt32())
                    {
                        case WM_DEVICECHANGE:
                            break;

                        case DBT_DEVICEARRIVAL:   //U盘插入,定位在第一个插入的U盘
                            DriveInfo[] s = DriveInfo.GetDrives();
                            foreach (DriveInfo drive in s)
                            {
                                if (drive.DriveType == DriveType.Removable)
                                {
                                    USBFlashDiskPath = drive.Name.ToString();
                                    OpenFilebtn.Enabled = true;
                                    break;
                                }
                            }
                            break;

                        case DBT_DEVICEREMOVECOMPLETE:   //U盘卸载,判断是否还有U盘
                            USBFlashDiskPath = "";
                            DriveInfo[] a = DriveInfo.GetDrives();
                            foreach (DriveInfo drive in a)
                            {
                                if (drive.DriveType == DriveType.Removable)
                                {
                                    USBFlashDiskPath = drive.Name.ToString();
                                    break;
                                }
                              
                            }
                            if (USBFlashDiskPath == "")
                            {
                                OpenFilebtn.Enabled = false;
                            }
                            break;

                        default:
                            break;

                    }

                }

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message);

            }

            base.WndProc(ref m);

        }