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 DS接口代码：

using System;
using System.Runtime.InteropServices;

namespace ImenuPDA
{
    [ComVisible(false)]
    public enum PinDirection  // PIN_DIRECTION
    {
        Input,  // PINDIR_INPUT
        Output  // PINDIR_OUTPUT
    }

    public enum DsEvCode
    {
        None,
        Complete = 0x01,  // EC_COMPLETE
        UserAbort = 0x02,  // EC_USERABORT
        ErrorAbort = 0x03,  // EC_ERRORABORT
        Time = 0x04,  // EC_TIME
        Repaint = 0x05,  // EC_REPAINT
        StErrStopped = 0x06,  // EC_STREAM_ERROR_STOPPED
        StErrStPlaying = 0x07,  // EC_STREAM_ERROR_STILLPLAYING
        ErrorStPlaying = 0x08,  // EC_ERROR_STILLPLAYING
        PaletteChanged = 0x09,  // EC_PALETTE_CHANGED
        VideoSizeChanged = 0x0a,  // EC_VIDEO_SIZE_CHANGED
        QualityChange = 0x0b,  // EC_QUALITY_CHANGE
        ShuttingDown = 0x0c,  // EC_SHUTTING_DOWN
        ClockChanged = 0x0d,  // EC_CLOCK_CHANGED
        Paused = 0x0e,  // EC_PAUSED
        OpeningFile = 0x10,  // EC_OPENING_FILE
        BufferingData = 0x11,  // EC_BUFFERING_DATA
        FullScreenLost = 0x12,  // EC_FULLSCREEN_LOST
        Activate = 0x13,  // EC_ACTIVATE
        NeedRestart = 0x14,  // EC_NEED_RESTART
        WindowDestroyed = 0x15,  // EC_WINDOW_DESTROYED
        DisplayChanged = 0x16,  // EC_DISPLAY_CHANGED
        Starvation = 0x17,  // EC_STARVATION
        OleEvent = 0x18,  // EC_OLE_EVENT
        NotifyWindow = 0x19,  // EC_NOTIFY_WINDOW
        // EC_ ....

        // DVDevCod.h
        DvdDomChange = 0x101, // EC_DVD_DOMAIN_CHANGE
        DvdTitleChange = 0x102, // EC_DVD_TITLE_CHANGE
        DvdChaptStart = 0x103, // EC_DVD_CHAPTER_START
        DvdAudioStChange = 0x104, // EC_DVD_AUDIO_STREAM_CHANGE

        DvdSubPicStChange = 0x105, // EC_DVD_SUBPICTURE_STREAM_CHANGE
        DvdAngleChange = 0x106, // EC_DVD_ANGLE_CHANGE
        DvdButtonChange = 0x107, // EC_DVD_BUTTON_CHANGE
        DvdValidUopsChange = 0x108, // EC_DVD_VALID_UOPS_CHANGE
        DvdStillOn = 0x109, // EC_DVD_STILL_ON
        DvdStillOff = 0x10a, // EC_DVD_STILL_OFF
        DvdCurrentTime = 0x10b, // EC_DVD_CURRENT_TIME
        DvdError = 0x10c, // EC_DVD_ERROR
        DvdWarning = 0x10d, // EC_DVD_WARNING
        DvdChaptAutoStop = 0x10e, // EC_DVD_CHAPTER_AUTOSTOP
        DvdNoFpPgc = 0x10f, // EC_DVD_NO_FP_PGC
        DvdPlaybRateChange = 0x110, // EC_DVD_PLAYBACK_RATE_CHANGE
        DvdParentalLChange = 0x111, // EC_DVD_PARENTAL_LEVEL_CHANGE
        DvdPlaybStopped = 0x112, // EC_DVD_PLAYBACK_STOPPED
        DvdAnglesAvail = 0x113, // EC_DVD_ANGLES_AVAILABLE
        DvdPeriodAStop = 0x114, // EC_DVD_PLAYPERIOD_AUTOSTOP
        DvdButtonAActivated = 0x115, // EC_DVD_BUTTON_AUTO_ACTIVATED
        DvdCmdStart = 0x116, // EC_DVD_CMD_START
        DvdCmdEnd = 0x117, // EC_DVD_CMD_END
        DvdDiscEjected = 0x118, // EC_DVD_DISC_EJECTED
        DvdDiscInserted = 0x119, // EC_DVD_DISC_INSERTED
        DvdCurrentHmsfTime = 0x11a, // EC_DVD_CURRENT_HMSF_TIME
        DvdKaraokeMode = 0x11b  // EC_DVD_KARAOKE_MODE
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode), ComVisible(false)]
    public class FilterInfo  //  FILTER_INFO
    {
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
        public string achName;
        [MarshalAs(UnmanagedType.IUnknown)]
        public object pUnk;
    }

    [StructLayout(LayoutKind.Sequential), ComVisible(false)]
    public class AMMediaType  //  AM_MEDIA_TYPE
    {
        public Guid majorType;
        public Guid subType;
        [MarshalAs(UnmanagedType.Bool)]
        public bool fixedSizeSamples;
        [MarshalAs(UnmanagedType.Bool)]
        public bool temporalCompression;
        public int sampleSize;
        public Guid formatType;
        public IntPtr unkPtr;
        public uint cbFormat;
        public IntPtr formatPtr;
    }

    [ComVisible(true), ComImport,
   Guid("56a86891-0ad4-11ce-b03a-0020af0ba770"),
   InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IPin
    {
        [PreserveSig]
        int Connect(
            [In]           IPin pReceivePin,
            [In, MarshalAs(UnmanagedType.LPStruct)]   AMMediaType pmt);

        [PreserveSig]
        int ReceiveConnection(
            [In]           IPin pReceivePin,
            [In, MarshalAs(UnmanagedType.LPStruct)]   AMMediaType pmt);

        [PreserveSig]
        int Disconnect();

        [PreserveSig]
        int ConnectedTo([Out] out IPin ppPin);

        [PreserveSig]
        int ConnectionMediaType(
            [Out, MarshalAs(UnmanagedType.LPStruct)]  AMMediaType pmt);

        [PreserveSig]
        int QueryPinInfo(IntPtr pInfo);

        [PreserveSig]
        int QueryDirection(out PinDirection pPinDir);

        [PreserveSig]
        int QueryId(
            [Out, MarshalAs(UnmanagedType.LPWStr)]  out string Id);

        [PreserveSig]
        int QueryAccept(
            [In, MarshalAs(UnmanagedType.LPStruct)]   AMMediaType pmt);

        [PreserveSig]
        int EnumMediaTypes(IntPtr ppEnum);

        [PreserveSig]
        int QueryInternalConnections(IntPtr apPin, [In, Out] ref int nPin);

        [PreserveSig]
        int EndOfStream();

        [PreserveSig]
        int BeginFlush();

        [PreserveSig]
        int EndFlush();

        [PreserveSig]
        int NewSegment(long tStart, long tStop, double dRate);
    }

    [ComVisible(true), ComImport,
    Guid("56a86897-0ad4-11ce-b03a-0020af0ba770"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IReferenceClock
    {
        [PreserveSig]
        int GetTime(out long pTime);

        [PreserveSig]
        int AdviseTime(long baseTime, long streamTime, IntPtr hEvent, out int pdwAdviseCookie);

        [PreserveSig]
        int AdvisePeriodic(long startTime, long periodTime, IntPtr hSemaphore, out int pdwAdviseCookie);

        [PreserveSig]
        int Unadvise(int dwAdviseCookie);
    }

    [ComVisible(true), ComImport,
    Guid("56a8689f-0ad4-11ce-b03a-0020af0ba770"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IFilterGraph
    {
        [PreserveSig]
        int AddFilter(
            [In] IBaseFilter pFilter,
            [In, MarshalAs(UnmanagedType.LPWStr)]   string pName);

        [PreserveSig]
        int RemoveFilter([In] IBaseFilter pFilter);

        [PreserveSig]
        int EnumFilters([Out] out IEnumFilters ppEnum);

        [PreserveSig]
        int FindFilterByName(
            [In, MarshalAs(UnmanagedType.LPWStr)]   string pName,
            [Out]          out IBaseFilter ppFilter);

        [PreserveSig]
        int ConnectDirect([In] IPin ppinOut, [In] IPin ppinIn,
           [In, MarshalAs(UnmanagedType.LPStruct)]   AMMediaType pmt);

        [PreserveSig]
        int Reconnect([In] IPin ppin);

        [PreserveSig]
        int Disconnect([In] IPin ppin);

        [PreserveSig]
        int SetDefaultSyncSource();

    }

    [ComVisible(true), ComImport,
    Guid("56a86892-0ad4-11ce-b03a-0020af0ba770"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IEnumPins
    {
        [PreserveSig]
        int Next(
            [In]               int cPins,
            [Out, MarshalAs(UnmanagedType.LPArray)] out IPin[] ppPins,
            [Out]              out int pcFetched);

        [PreserveSig]
        int Skip([In] int cPins);
        void Reset();
        void Clone([Out] out IEnumPins ppEnum);
    }

    [ComVisible(true), ComImport,
   Guid("56a86895-0ad4-11ce-b03a-0020af0ba770"),
   InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IBaseFilter
    {
        #region "IPersist Methods"
        [PreserveSig]
        int GetClassID(
            [Out]         out Guid pClassID);
        #endregion

        #region "IMediaFilter Methods"
        [PreserveSig]
        int Stop();

        [PreserveSig]
        int Pause();

        [PreserveSig]
        int Run(long tStart);

        [PreserveSig]
        int GetState(int dwMilliSecsTimeout, [Out] out int filtState);

        [PreserveSig]
        int SetSyncSource([In] IReferenceClock pClock);

        [PreserveSig]
        int GetSyncSource([Out] out IReferenceClock pClock);
        #endregion

        [PreserveSig]
        int EnumPins(
            [Out]          out IEnumPins ppEnum);

        [PreserveSig]
        int FindPin(
            [In, MarshalAs(UnmanagedType.LPWStr)]   string Id,
            [Out]          out IPin ppPin);

        [PreserveSig]
        int QueryFilterInfo(
            [Out]           FilterInfo pInfo);

        [PreserveSig]
        int JoinFilterGraph(
            [In]           IFilterGraph pGraph,
            [In, MarshalAs(UnmanagedType.LPWStr)]   string pName);

        [PreserveSig]
        int QueryVendorInfo(
            [Out, MarshalAs(UnmanagedType.LPWStr)]  out string pVendorInfo);
    }

    [ComVisible(true), ComImport,
    Guid("56a868a9-0ad4-11ce-b03a-0020af0ba770"),//56a868a9-0ad4-11ce-b03a-0020af0ba770
            InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IGraphBuilder
    {
        #region "IFilterGraph Methods"
        [PreserveSig]
        int AddFilter(
            [In] IBaseFilter pFilter,
            [In, MarshalAs(UnmanagedType.LPWStr)]   string pName);

        [PreserveSig]
        int RemoveFilter([In] IBaseFilter pFilter);

        [PreserveSig]
        int EnumFilters([Out] out IEnumFilters ppEnum);

        [PreserveSig]
        int FindFilterByName(
            [In, MarshalAs(UnmanagedType.LPWStr)]   string pName,
            [Out]          out IBaseFilter ppFilter);

        /// <summary>
        /// This method connects the two pins directly (without intervening filters).
        /// </summary>
        /// <param name="ppinOut"></param>
        /// <param name="ppinIn"></param>
        /// <param name="pmt">[in] Media type to use for the connection (optional; that is, can be NULL). </param>
        /// <returns></returns>
        [PreserveSig]
        int ConnectDirect([In] IPin ppinOut, [In] IPin ppinIn,
           [In, MarshalAs(UnmanagedType.LPStruct)]   AMMediaType pmt);

        [PreserveSig]
        int Reconnect([In] IPin ppin);

        [PreserveSig]
        int Disconnect([In] IPin ppin);

        [PreserveSig]
        int SetDefaultSyncSource();
        #endregion

        [PreserveSig]
        int Connect([In] IPin ppinOut, [In] IPin ppinIn);

        [PreserveSig]
        int Render([In] IPin ppinOut);

        [PreserveSig]
        int RenderFile(
            [In, MarshalAs(UnmanagedType.LPWStr)]   string lpcwstrFile,
            [In, MarshalAs(UnmanagedType.LPWStr)]   string lpcwstrPlayList);

        [PreserveSig]
        int AddSourceFilter(
            [In, MarshalAs(UnmanagedType.LPWStr)]   string lpcwstrFileName,
            [In, MarshalAs(UnmanagedType.LPWStr)]   string lpcwstrFilterName,
            [Out]          out IBaseFilter ppFilter);

        [PreserveSig]
        int SetLogFile(IntPtr hFile);

        [PreserveSig]
        int Abort();

        [PreserveSig]
        int ShouldOperationContinue();
    }

    // ---------------------------------------------------------------------------------------
    /// <summary>
    /// The IFilterGraph::EnumFilters method returns the enumerator interface. It is based on the COM IEnum style of enumerators.
    /// </summary>
    [ComVisible(true), ComImport,
    Guid("56a86893-0ad4-11ce-b03a-0020af0ba770"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IEnumFilters
    {
        [PreserveSig]
        int Next(
            [In]               int cFilters,
            [Out, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] out IBaseFilter[] ppFilter,
            [Out]              out int pcFetched);

        [PreserveSig]
        int Skip([In] int cFilters);
        void Reset();
        void Clone([Out] out IEnumFilters ppEnum);
    }

    [ComVisible(true), ComImport,
    Guid("56a868c0-0ad4-11ce-b03a-0020af0ba770"),
    InterfaceType(ComInterfaceType.InterfaceIsDual)]
    public interface IMediaEventEx
    {
        #region "IMediaEvent Methods"
        [PreserveSig]
        int GetEventHandle(out IntPtr hEvent);

        [PreserveSig]
        int GetEvent(out DsEvCode lEventCode, out int lParam1, out int lParam2, uint msTimeout);

        [PreserveSig]
        int WaitForCompletion(int msTimeout, [Out] out int pEvCode);

        [PreserveSig]
        int CancelDefaultHandling(int lEvCode);

        [PreserveSig]
        int RestoreDefaultHandling(int lEvCode);

        [PreserveSig]
        int FreeEventParams(DsEvCode lEvCode, int lParam1, int lParam2);
        #endregion

        [PreserveSig]
        int SetNotifyWindow(IntPtr hwnd, int lMsg, IntPtr lInstanceData);

        [PreserveSig]
        int SetNotifyFlags(int lNoNotifyFlags);

        [PreserveSig]
        int GetNotifyFlags(out int lplNoNotifyFlags);
    }

    [ComVisible(true), ComImport,
  Guid("56a868b5-0ad4-11ce-b03a-0020af0ba770"),
   InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    public interface IBasicVideo
    {
        [PreserveSig]
        int get_AvgTimePerFrame(out double pAvgTimePerFrame);

        [PreserveSig]
        int get_BitRate(out int pBitRate);

        [PreserveSig]
        int get_BitErrorRate(out int pBitRate);

        [PreserveSig]
        int get_VideoWidth(out int pVideoWidth);

        [PreserveSig]
        int get_VideoHeight(out int pVideoHeight);

        [PreserveSig]
        int put_SourceLeft(int SourceLeft);
        [PreserveSig]
        int get_SourceLeft(out int pSourceLeft);

        [PreserveSig]
        int put_SourceWidth(int SourceWidth);
        [PreserveSig]
        int get_SourceWidth(out int pSourceWidth);

        [PreserveSig]
        int put_SourceTop(int SourceTop);
        [PreserveSig]
        int get_SourceTop(out int pSourceTop);

        [PreserveSig]
        int put_SourceHeight(int SourceHeight);
        [PreserveSig]
        int get_SourceHeight(out int pSourceHeight);

 

        [PreserveSig]
        int put_DestinationLeft(int DestinationLeft);
        [PreserveSig]
        int get_DestinationLeft(out int pDestinationLeft);

        [PreserveSig]
        int put_DestinationWidth(int DestinationWidth);
        [PreserveSig]
        int get_DestinationWidth(out int pDestinationWidth);

        [PreserveSig]
        int put_DestinationTop(int DestinationTop);
        [PreserveSig]
        int get_DestinationTop(out int pDestinationTop);

        [PreserveSig]
        int put_DestinationHeight(int DestinationHeight);
        [PreserveSig]
        int get_DestinationHeight(out int pDestinationHeight);

        [PreserveSig]
        int SetSourcePosition(int left, int top, int width, int height);
        [PreserveSig]
        int GetSourcePosition(out int left, out int top, out int width, out int height);
        [PreserveSig]
        int SetDefaultSourcePosition();

        [PreserveSig]
        int SetDestinationPosition(int left, int top, int width, int height);
        [PreserveSig]
        int GetDestinationPosition(out int left, out int top, out int width, out int height);
        [PreserveSig]
        int SetDefaultDestinationPosition();

        [PreserveSig]
        int GetVideoSize(out int pWidth, out int pHeight);

        [PreserveSig]
        int GetVideoPaletteEntries(int StartIndex, int Entries, out int pRetrieved, IntPtr pPalette);

        [PreserveSig]
        int GetCurrentImage(ref int pBufferSize, IntPtr pDIBImage);

        [PreserveSig]
        int IsUsingDefaultSource();
        [PreserveSig]
        int IsUsingDefaultDestination();
        /* The following will supported in IBasicVideo2
        [PreserveSig]
        int GetPreferredAspectRatio(out int plAspectX, out int plAspectY);
         */
    }

    [ComVisible(true), ComImport,
   Guid("56a868b4-0ad4-11ce-b03a-0020af0ba770"),
   InterfaceType(ComInterfaceType.InterfaceIsDual)]
    public interface IVideoWindow
    {
        [PreserveSig]
        int put_Caption(string caption);
        [PreserveSig]
        int get_Caption([Out] out string caption);

        [PreserveSig]
        int put_WindowStyle(int windowStyle);
        [PreserveSig]
        int get_WindowStyle(out int windowStyle);

        [PreserveSig]
        int put_WindowStyleEx(int windowStyleEx);
        [PreserveSig]
        int get_WindowStyleEx(out int windowStyleEx);

        [PreserveSig]
        int put_AutoShow(int autoShow);
        [PreserveSig]
        int get_AutoShow(out int autoShow);

        [PreserveSig]
        int put_WindowState(int windowState);
        [PreserveSig]
        int get_WindowState(out int windowState);

        [PreserveSig]
        int put_BackgroundPalette(int backgroundPalette);
        [PreserveSig]
        int get_BackgroundPalette(out int backgroundPalette);

        [PreserveSig]
        int put_Visible(int visible);
        [PreserveSig]
        int get_Visible(out int visible);

        [PreserveSig]
        int put_Left(int left);
        [PreserveSig]
        int get_Left(out int left);

        [PreserveSig]
        int put_Width(int width);
        [PreserveSig]
        int get_Width(out int width);

        [PreserveSig]
        int put_Top(int top);
        [PreserveSig]
        int get_Top(out int top);

        [PreserveSig]
        int put_Height(int height);
        [PreserveSig]
        int get_Height(out int height);

        [PreserveSig]
        int put_Owner(IntPtr owner);
        [PreserveSig]
        int get_Owner(out IntPtr owner);

        [PreserveSig]
        int put_MessageDrain(IntPtr drain);
        [PreserveSig]
        int get_MessageDrain(out IntPtr drain);

        [PreserveSig]
        int get_BorderColor(out int color);
        [PreserveSig]
        int put_BorderColor(int color);

        [PreserveSig]
        int get_FullScreenMode(out int fullScreenMode);
        [PreserveSig]
        int put_FullScreenMode(int fullScreenMode);

        [PreserveSig]
        int SetWindowForeground(int focus);

        [PreserveSig]
        int NotifyOwnerMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam);

        [PreserveSig]
        int SetWindowPosition(int left, int top, int width, int height);

        [PreserveSig]
        int GetWindowPosition(out int left, out int top, out int width, out int height);

        [PreserveSig]
        int GetMinIdealImageSize(out int width, out int height);

        [PreserveSig]
        int GetMaxIdealImageSize(out int width, out int height);

        [PreserveSig]
        int GetRestorePosition(out int left, out int top, out int width, out int height);

        [PreserveSig]
        int HideCursor(int hideCursor);

        [PreserveSig]
        int IsCursorHidden(out int hideCursor);
    }

    [ComVisible(true), ComImport,
    Guid("56a868b3-0ad4-11ce-b03a-0020af0ba770"),
    InterfaceType(ComInterfaceType.InterfaceIsDual)]
    public interface IBasicAudio
    {
        [PreserveSig]
        int put_Volume(int lVolume);
        [PreserveSig]
        int get_Volume(out int plVolume);

        [PreserveSig]
        int put_Balance(int lBalance);
        [PreserveSig]
        int get_Balance(out int plBalance);
    }

    [ComVisible(true), ComImport,
    Guid("56a868b1-0ad4-11ce-b03a-0020af0ba770"),
    InterfaceType(ComInterfaceType.InterfaceIsDual)]
    public interface IMediaControl
    {
        [PreserveSig]
        int Run();

        [PreserveSig]
        int Pause();

        [PreserveSig]
        int Stop();

        [PreserveSig]
        int GetState(int msTimeout, out int pfs);

        [PreserveSig]
        int RenderFile(string strFilename);

        [PreserveSig]
        int AddSourceFilter(
            [In]           string strFilename,
            [Out, MarshalAs(UnmanagedType.IDispatch)] out object ppUnk);

        [PreserveSig]
        int get_FilterCollection(
            [Out, MarshalAs(UnmanagedType.IDispatch)] out object ppUnk);

        [PreserveSig]
        int get_RegFilterCollection(
            [Out, MarshalAs(UnmanagedType.IDispatch)] out object ppUnk);

        [PreserveSig]
        int StopWhenReady();
    }

 

}

 

调用示例：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace ImenuPDA
{
    public partial class Form2 : Form
    {

        Guid FilterGraph = new Guid("e436ebb3-524f-11ce-9f53-0020af0ba770");
        object comObject = null;
        //要播放的文件路径
        //string clipFile = @"/clock.avi";
        string clipFile = @"/ResidentFlash/Diablo3-CinematicTrailer_US (1).wmv";
        IGraphBuilder graphBuilder;
        private IVideoWindow videoWin;
        private IBasicVideo basicVideo;
        private IBasicAudio basicAudio;
        private IMediaControl mediaCtl;
        private IMediaEventEx mediaEvt;

        private const int WM_GRAPHNOTIFY = 0x00008001;
        private const int WS_CHILD = 0x40000000;
        private const int WS_CLIPCHILDREN = 0x02000000;
        private const int WS_CLIPSIBLINGS = 0x04000000;

        public Form2()
        {
            InitializeComponent();
        }

        private void menuItem1_Click(object sender, EventArgs e)
        {
            try
            {
                //获得DirectShow的接口
                GetInterface();

                //使用GraphBuilder 的智能链接来自动播放音视频文件。
                int hr = graphBuilder.RenderFile(clipFile, null);
                //每一次调用Com方法要检查返回的int类型的数据，如果小于0，一般意味着有错误发生
                //并通过放回值可以知道何种错误。
                CHK(hr);

                hr = mediaEvt.SetNotifyWindow(this.Handle, WM_GRAPHNOTIFY, IntPtr.Zero);
                CHK(hr);

                hr = videoWin.put_Owner(this.Handle);
                CHK(hr);
                //设置视频播放窗口类型
                hr = videoWin.put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN);
                CHK(hr);
                Rectangle rc = this.ClientRectangle;
                //设置视频播放窗口大小位置
                hr = videoWin.SetWindowPosition(0, 0, rc.Right, rc.Bottom);
                CHK(hr);

                //通过IMediaControl接口的Run方法来使得整个Filter Graph运行从而播放文件
                hr = mediaCtl.Run();
                CHK(hr);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void CHK(int hr)
        {
            if (hr < 0)
            {
                Marshal.ThrowExceptionForHR(hr);
            }
        }

        private void GetInterface()
        {
            try
            {
                comObject = CreateComObj(FilterGraph);
                graphBuilder = (IGraphBuilder)comObject;
                comObject = null;
                //通过获得的IGraphBuilder接口来获得其他接口
                mediaCtl = (IMediaControl)graphBuilder;
                mediaEvt = (IMediaEventEx)graphBuilder;
                videoWin = graphBuilder as IVideoWindow;
                basicVideo = graphBuilder as IBasicVideo;
                basicAudio = graphBuilder as IBasicAudio;
            }
            finally
            {
                if (comObject != null)
                    Marshal.ReleaseComObject(comObject);
                comObject = null;
            }
        }

        private object CreateComObj(Guid ClsID)
        {
            object com = null;
            try
            {
                //通过Com对象的Guid来生成Com对象
                Type clsType = Type.GetTypeFromCLSID(ClsID);
                com = Activator.CreateInstance(clsType);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            return com;
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }
    }
}