一个很简化的C#加密方式

        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }

        private void menuItemOpen_Click(object sender, System.EventArgs e)
        {
            openFileDialog1.Filter = "视频文件(*.avi;*.wmv;*.dat;*.mpg;*.mpeg;*.mov;*.wm;*.wma)|*.avi;*.wmv;*.dat;*.mpg;*.mpeg;*.mov;*.wm;*.wma|音频文件(*.wav;*.mp3;*.snd;*.au;*.midi;*.mid)|*.wav;*.mp3;*.snd;*.au;*.midi;*.mid|所有文件(*.*)|*.*";
            //打开的文件类型
            if(openFileDialog1.ShowDialog()==DialogResult.OK)
            {
                axWindowsMediaPlayer1.FileName = openFileDialog1.FileName;
                //如果打开的是音频文件，则禁止【视频】菜单组
                if(openFileDialog1.FilterIndex == 2)
                    menuItemVideo.Enabled = false;
                else
                    menuItemVideo.Enabled = true;
            }

        }

        private void menuItemClose_Click(object sender, System.EventArgs e)
        {
            axWindowsMediaPlayer1.FileName = null;
            menuItemVideo.Enabled = false;
        }

        private void menuItemInitSize_Click(object sender, System.EventArgs e)
        {
            axWindowsMediaPlayer1.DisplaySize = MPDisplaySizeConstants.mpDefaultSize;
        }

        private void menuItemFullScreen_Click(object sender, System.EventArgs e)
        {
            axWindowsMediaPlayer1.DisplaySize = MPDisplaySizeConstants.mpFullScreen;
        }

        private void menuItemShowAudioCtrl_Click(object sender, System.EventArgs e)
        {
            menuItemShowAudioCtrl.Checked = !menuItemShowAudioCtrl.Checked;
            axWindowsMediaPlayer1.ShowTracker = false;
            axWindowsMediaPlayer1.ShowTracker = menuItemShowTrackbarCtrl.Checked;
            axWindowsMediaPlayer1.ShowAudioControls = menuItemShowAudioCtrl.Checked;
        }

        private void menuItemShowPositionCtrl_Click(object sender, System.EventArgs e)
        {
            menuItemShowPositionCtrl.Checked = !menuItemShowPositionCtrl.Checked;
            axWindowsMediaPlayer1.ShowPositionControls = menuItemShowPositionCtrl.Checked;
        }

        private void menuItemShowTrackbarCtrl_Click(object sender, System.EventArgs e)
        {
            menuItemShowTrackbarCtrl.Checked = !menuItemShowTrackbarCtrl.Checked;
            axWindowsMediaPlayer1.ShowAudioControls = false;
            axWindowsMediaPlayer1.ShowTracker = menuItemShowTrackbarCtrl.Checked;
            axWindowsMediaPlayer1.ShowAudioControls = menuItemShowAudioCtrl.Checked;
        }

        private void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
        {

            openFileDialog1.OpenFile();
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {

          }
        }
    }

  
     如图2中选中的AxMediaPlayer和MediaPlayer既需自己生成的dll，2003系统默认中无迹可寻！他们所起的作用便是实现对ActiceX中播放器相关的函数的调用！
          所以，对于多媒体应用程序的编写，关键在于了解对ActiveX相关控件的调用过程！

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【责编:Ken】