C#.NET2005实现一个流媒体播放器

用C#.NET2005实现一个流媒体播放器，感觉还是不错的，就是调用了Windows中的一个动态连接库——Quarz.dll。我写的是一个DirectShow多媒体播放器。支持目前为止的大部分格式。代码共享一下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using QuartzTypeLib;//这个就是Quarz.dll转换后的Dll文件

namespace myMedia
{
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
           // private System.ComponentModel.IContainer components;
            private const int WM_APP = 0x8000;
            private const int WM_GRAPHNOTIEY = WM_APP + 1;
            private const int EC_COMPLETE = 0x01;
            private const int WS_CHILD = 0x40000000;
            private const int WS_CLIPCHILDREN = 0x2000000;
            private FilgraphManager m_objFilterGraph = null;
            private IBasicAudio m_objBasicAudio = null;
            private IVideoWindow m_objVideoWindow = null;
            private IMediaEvent m_objMediaEvent = null;
            private IMediaEventEx m_objMediaEventEx = null;
            private IMediaPosition m_objMediaPosition = null;
            private IMediaControl m_objMediaControl = null;
            enum MadiaStatus { None, Stopped, Paused, Running };
            private MadiaStatus m_CurrentStatus = MadiaStatus.None;

            private void CleanUp()
            {
                if (m_objMediaControl != null)
                {
                    m_objMediaControl.Stop();
                }
                m_CurrentStatus = MadiaStatus.Stopped;
                if (m_objMediaEventEx != null)
                    m_objMediaEventEx.SetNotifyWindow(0, 0, 0);
                if (m_objVideoWindow != null)
                {
                    m_objVideoWindow.Visible = 0;
                    m_objVideoWindow.Owner = 0;
                }
                if (m_objMediaControl != null) m_objMediaControl = null;
                if (m_objMediaPosition != null) m_objMediaPosition = null;
                if (m_objMediaEventEx != null) m_objMediaEventEx = null;
                if (m_objMediaEvent != null) m_objMediaEvent = null;
                if (m_objBasicAudio != null) m_objBasicAudio = null;
                if (m_objFilterGraph != null) m_objFilterGraph = null;
            }
            private void Open_Dialog(object sender, System.EventArgs e)
            {
                OpenFileDialog openFileDialog = new OpenFileDialog();
                openFileDialog.Filter = "Media Files|*.mpg;*.avi;*.wma;*.mov;*.mav;*.mp2;*.mp3;*.rm;*.rmvb|All Files|*.*";
                if (DialogResult.OK == openFileDialog.ShowDialog())
                {
                    CleanUp();
                    m_objFilterGraph = new FilgraphManager();
                    m_objFilterGraph.RenderFile(openFileDialog.FileName);
                    try
                    {
                        m_objBasicAudio = m_objFilterGraph as IBasicAudio;
                        m_objVideoWindow = m_objFilterGraph as IVideoWindow;
                        m_objVideoWindow.Owner = (int)panel1.Handle;
                        m_objVideoWindow.WindowStyle = WS_CHILD | WS_CLIPCHILDREN;
                        m_objVideoWindow.SetWindowPosition(panel1.ClientRectangle.Left, panel1.ClientRectangle.Top, panel1.ClientRectangle.Width, panel1.ClientRectangle.Height);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("该文件没有图象信息！");
                        m_objVideoWindow = null;
                    }
                    m_objMediaEvent = m_objFilterGraph as IMediaEvent;
                    m_objMediaEventEx = m_objFilterGraph as IMediaEventEx;
                    m_objMediaPosition = m_objFilterGraph as IMediaPosition;
                    m_objMediaControl = m_objFilterGraph as IMediaControl;
                    this.Text = "DirectShow - [" + openFileDialog.FileName + "]";
                    m_objMediaControl.Run();
                    m_CurrentStatus = MadiaStatus.Running;
                }
            }

            private void UpdateToolBar()//用了一个toolStrip
            {
                switch (m_CurrentStatus)
                {
                    case MadiaStatus.None:
                        toolStripButton1.Enabled = true;
                        toolStripButton2.Enabled = false;
                        toolStripButton3.Enabled = false;
                        toolStripButton4.Enabled = false;
                        toolStripButton5.Enabled = true;
                        break;
                    case MadiaStatus.Paused:
                        toolStripButton1.Enabled = false;
                        toolStripButton2.Enabled = true;
                        toolStripButton3.Enabled = false;
                        toolStripButton4.Enabled = true;
                        toolStripButton5.Enabled = true;
                        break;
                    case MadiaStatus.Running:
                        toolStripButton1.Enabled = false;
                        toolStripButton2.Enabled = false;
                        toolStripButton3.Enabled = true;
                        toolStripButton4.Enabled = true;
                        toolStripButton5.Enabled = true;
                        break;
                    case MadiaStatus.Stopped:
                        toolStripButton1.Enabled = true;
                        toolStripButton2.Enabled = false;
                        toolStripButton3.Enabled = false;
                        toolStripButton4.Enabled = false;
                        toolStripButton5.Enabled = true;
                        break;
                }
            }

            private void ExitWin(object sender, System.EventArgs e)
            {
                this.Close();
            }
            private void toolStripButton1_Click(object sender, EventArgs e)
            {
                Open_Dialog(sender, e);
                UpdateToolBar();
            }

            private void toolStripButton2_Click(object sender, EventArgs e)
            {
                m_objMediaControl.Run();
                m_CurrentStatus = MadiaStatus.Running;
                UpdateToolBar();
            }

            private void toolStripButton3_Click(object sender, EventArgs e)
            {
                m_objMediaControl.Pause();
                m_CurrentStatus = MadiaStatus.Paused;
                UpdateToolBar();
            }

            private void toolStripButton4_Click(object sender, EventArgs e)
            {
                m_objMediaPosition.CurrentPosition = 0;
                m_CurrentStatus = MadiaStatus.Stopped;
                CleanUp();
                UpdateToolBar();
            }

            private void toolStripButton5_Click(object sender, EventArgs e)
            {
                ExitWin(sender, e);
            }

            private void Form1_SizeChanged(object sender, EventArgs e)
            {
                panel1.Size = Form1.ActiveForm.Size;
                if (m_objVideoWindow != null)
                {
                    m_objVideoWindow.SetWindowPosition(panel1.ClientRectangle.Left, panel1.ClientRectangle.Top, panel1.ClientRectangle.Width, panel1.ClientRectangle.Height);
                }
            }

            private void Form1_Load(object sender, EventArgs e)
            {
                this.Text = "我的制作——流媒体播放器";
                UpdateToolBar();
            }

        }
}