Csharp: play media file using Microsoft.DirectX

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using Microsoft.DirectX.AudioVideoPlayback;//需到微軟官網下載SDK //MP4播放下載了DivX Plus 解碼器   namespace WindowsChineseCalender {     /// <summary>     /// 塗聚文 20121222     /// Geovin Du     /// </summary>     public partial class MediaPlayForm : Form     {         Video vdo;           public string mode = "play";         public string PlayingPosition, Duration;             /// <summary>         ///         /// </summary>         public MediaPlayForm()         {             InitializeComponent();             VolumeTrackBar.Value = 4;         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void MediaPlayForm_Load(object sender, EventArgs e)         {             MaximizeBox = false;         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void btnupload_Click(object sender, EventArgs e)         {             OpenFileDialog openFileDialog = new OpenFileDialog();             openFileDialog.ShowDialog();             openFileDialog1.Title = "Select video file..";             openFileDialog1.InitialDirectory = Application.StartupPath;             openFileDialog1.DefaultExt = ".avi";             openFileDialog.Filter = "Media Files|*.mpg;*.avi;*.wma;*.mov;*.wav;*.mp2;*.mp3|All Files|*.*";             vdo = new Video(openFileDialog.FileName);               vdo.Owner = panel1;             panel1.Width = 700;             panel1.Height = 390;             Duration = CalculateTime(vdo.Duration);             PlayingPosition = "0:00:00";             txtStatus.Text = PlayingPosition + "/" + Duration;               vdoTrackBar.Minimum = 0;             vdoTrackBar.Maximum = Convert.ToInt32(vdo.Duration);         }         /// <summary>         /// 播放         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void btnPlay_Click(object sender, EventArgs e)         {             if (vdo != null)             {                 if (vdo.Playing)                 {                     vdo.Pause();                     timer1.Stop();                     btnPlay.BackgroundImage = WindowsChineseCalender.Properties.Resources.btnplay;                 }                 else                 {                     vdo.Play();                     timer1.Start();                       btnPlay.BackgroundImage = WindowsChineseCalender.Properties.Resources.pause;                 }             }         }         /// <summary>         /// 停止         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void btnStop_Click(object sender, EventArgs e)         {             vdo.Stop();             btnPlay.BackgroundImage = WindowsChineseCalender.Properties.Resources.btnplay;             vdoTrackBar.Value = 0;         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void timer1_Tick(object sender, EventArgs e)         {             PlayingPosition = CalculateTime(vdo.CurrentPosition);             txtStatus.Text = PlayingPosition + "/" + Duration;               if (vdo.CurrentPosition == vdo.Duration)             {                 timer1.Stop();                 Duration = CalculateTime(vdo.Duration);                 PlayingPosition = "0:00:00";                 txtStatus.Text = PlayingPosition + "/" + Duration;                 vdo.Stop();                 btnPlay.BackgroundImage = WindowsChineseCalender.Properties.Resources.btnplay;                 vdoTrackBar.Value = 0;             }             else             {                 if (vdoTrackBar.Value >=2500)                 {                     vdoTrackBar.Value--;                 }                 else                 {                     vdoTrackBar.Value += 1;                 }                                      }         }         /// <summary>         /// 化為時，分，秒樣式         /// </summary>         /// <param name="Time"></param>         /// <returns></returns>         public string CalculateTime(double Time)         {             string mm, ss, CalculatedTime;             int h, m, s, T;               Time = Math.Round(Time);             T = Convert.ToInt32(Time);               h = (T / 3600);             T = T % 3600;             m = (T / 60);             s = T % 60;               if (m < 10)                 mm = string.Format("0{0}", m);             else                 mm = m.ToString();             if (s < 10)                 ss = string.Format("0{0}", s);             else                 ss = s.ToString();               CalculatedTime = string.Format("{0}:{1}:{2}", h, mm, ss);               return CalculatedTime;         }         /// <summary>         /// 播放時段         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void vdoTrackBar_Scroll(object sender, EventArgs e)         {             if (vdo != null)             {                 vdo.CurrentPosition = vdoTrackBar.Value;             }           }         /// <summary>         ///         /// </summary>         /// <returns></returns>         public int CalculateVolume()         {             switch (VolumeTrackBar.Value)             {                 case 1:                     return -1500;                 case 2:                     return -1000;                 case 3:                     return -700;                 case 4:                     return -600;                 case 5:                     return -500;                 case 6:                     return -400;                 case 7:                     return -300;                 case 8:                     return -200;                 case 9:                     return -100;                 case 10:                     return 0;                 default:                     return -10000;             }         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void openFileDialog1_FileOk(object sender, CancelEventArgs e)         {             Duration = CalculateTime(vdo.Duration);             PlayingPosition = "0:00:00";             txtStatus.Text = PlayingPosition + "/" + Duration;         }         /// <summary>         /// 音量調節         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void VolumeTrackBar_Scroll(object sender, EventArgs e)         {             //if (vdo != null)             //{             //    vdo.Audio.Volume = CalculateVolume();             //}               if (vdo != null)             {                 vdo.Audio.Volume = CalculateVolume();             }         }         /// <summary>         /// 全屏         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void buttonFull_Click(object sender, EventArgs e)         {             vdo.Fullscreen = true;                                     }     } }