U盘监测

 #region U盘监测
        public const int WM_DEVICECHANGE = 0x219;
        public const int DBT_DEVICEARRIVAL = 0x8000;
        public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
        string drivestr; //驱动器名称
        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_DEVICECHANGE)
            {
                switch (m.WParam.ToInt32())
                {
                    case WM_DEVICECHANGE:
                        break;
                    case DBT_DEVICEARRIVAL: //U盘插入
                        {
                            DriveInfo[] s = DriveInfo.GetDrives();
                            foreach (DriveInfo drive in s)
                            {
                                if (drive.DriveType == DriveType.Removable)
                                {
                                    drivestr = drive.Name;
                                    NetConnect();
                                }
                            }
                            break;
                        }
                    case DBT_DEVICEREMOVECOMPLETE: //U盘拔出
                        {
                            NetConnect();
                            break;
                        }
                }
            }
            base.WndProc(ref m);
        } 
        #endregion

  #region 获取图片或者视频列表
        public string getVideoFileList()
        {
            string fileList = "";
            DriveInfo[] drives = DriveInfo.GetDrives();
            foreach (DriveInfo drive in drives)
            {
                //if (drive.DriveType == DriveType.Removable)
                //{
                string drivestr = drive.Name;
                if (Directory.Exists(drivestr))
                {
                    foreach (string d in Directory.GetFileSystemEntries(drivestr))
                    {
                        if (d.Equals(drivestr + "weixinmp4"))
                        {
                            foreach (string m_file in Directory.GetFileSystemEntries(d))
                            {
                                if (m_file.EndsWith(".mp4") || m_file.EndsWith(".flv"))
                                {
                                    fileList += "file:///" + m_file + "|";
                                }
                            }

                        }
                        else
                        {

                        }
                    }
                    if (fileList.Length > 0)
                    {
                        fileList = fileList.Substring(0, fileList.Length - 1);
                    }
                }
                //}
            }
            return fileList;
        } 
        #endregion