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   源码介绍

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解决某些Windows 7下不能拍照问题。

  public partial class frmCamera : Form, ISampleGrabberCB
    {
        #region 私有变量
        /// <summary>
        /// 保存抓拍的图片
        /// </summary>
        Image theImage = null;
        /// <summary>
        /// 需要重新抓拍的状态
        /// </summary>
        bool _reclap = false;
        /// <summary>
        /// 摄像头的状态
        /// </summary>
        bool _cameraIsStart = false;
        /// <summary>
        /// base filter of the actually used video devices. 
        /// </summary>
        private IBaseFilter capFilter;

        /// <summary> 
        /// graph builder interface. 
        /// </summary>
        private IGraphBuilder graphBuilder;

        /// <summary> 
        /// capture graph builder interface.
        /// </summary>
        private ICaptureGraphBuilder2 capGraph;
        private ISampleGrabber sampGrabber;

        /// <summary>
        /// control interface. 
        /// </summary>
        private IMediaControl mediaCtrl;

        /// <summary> event interface. </summary>
        private IMediaEventEx mediaEvt;

        /// <summary> video window interface. </summary>
        private IVideoWindow videoWin;

        /// <summary> grabber filter interface. </summary>
        private IBaseFilter baseGrabFlt;

        /// <summary> structure describing the bitmap to grab. </summary>
        private VideoInfoHeader videoInfoHeader;
        private bool captured = true;
        private int bufferedSize;

        /// <summary> 
        /// buffer for bitmap data.
        /// </summary>
        private byte[] savedArray;

        /// <summary> 
        /// list of installed video devices. 
        /// </summary>
        private ArrayList capDevices;

        private const int WM_GRAPHNOTIFY = 0x00008001;	// message from graph

        private const int WS_CHILD = 0x40000000;	// attributes for video window
        private const int WS_CLIPCHILDREN = 0x02000000;
        private const int WS_CLIPSIBLINGS = 0x04000000;

        /// <summary> 
        /// event when callback has finished (ISampleGrabberCB.BufferCB). 
        /// </summary>
        private delegate void CaptureDone();

#if DEBUG
        private int rotCookie = 0;
#endif
        #endregion

        #region 私有函数
        /// <summary>
        /// capture event, triggered by buffer callback.
        /// </summary>
        void OnCaptureDone()
        {
            Trace.WriteLine("!!DLG: OnCaptureDone");
            try
            {
                int hr;
                if (sampGrabber == null)
                    return;
                hr = sampGrabber.SetCallback(null, 0);

                int w = videoInfoHeader.BmiHeader.Width;
                int h = videoInfoHeader.BmiHeader.Height;
                if (((w & 0x03) != 0) || (w < 32) || (w > 4096) || (h < 32) || (h > 4096))
                    return;
                int stride = w * 3;

                GCHandle handle = GCHandle.Alloc(savedArray, GCHandleType.Pinned);
                int scan0 = (int)handle.AddrOfPinnedObject();
                scan0  = (h - 1) * stride;
                Bitmap b = new Bitmap(w, h, -stride, System.Drawing.Imaging.PixelFormat.Format24bppRgb, (IntPtr)scan0);
                handle.Free();
                savedArray = null;
                Image old = pbPicture.Image;
                pbPicture.Image = b;
                if (old != null)
                    old.Dispose();
            }
            catch (Exception ee)
            {
                MessageBox.Show(this, "Could not grab picture\r\n"   ee.Message, "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
            }
        }

        /// <summary> 
        /// start all the interfaces, graphs and preview window. 
        /// </summary>
        bool StartupVideo(UCOMIMoniker mon)
        {
            int hr;
            try
            {
                if (!CreateCaptureDevice(mon))
                    return false;

                if (!GetInterfaces())
                    return false;

                if (!SetupGraph())
                    return false;

                if (!SetupVideoWindow())
                    return false;

                #if DEBUG
                DsROT.AddGraphToRot(graphBuilder, out rotCookie);		// graphBuilder capGraph
                #endif

                hr = mediaCtrl.Run();
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                bool hasTuner = DsUtils.ShowTunerPinDialog(capGraph, capFilter, this.Handle);

                return true;
            }
            catch (Exception ee)
            {
                MessageBox.Show(this, "Could not start video stream\r\n"   ee.Message, "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                return false;
            }
        }

        /// <summary>
        /// make the video preview window to show in videoPanel.
        /// </summary>
        bool SetupVideoWindow()
        {
            int hr;
            try
            {
                // Set the video window to be a child of the main window
                hr = videoWin.put_Owner(pbCamera.Handle);
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                // Set video window style
                hr = videoWin.put_WindowStyle(WS_CHILD | WS_CLIPCHILDREN);
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                // Use helper function to position video window in client rect of owner window
                ResizeVideoWindow();

                // Make the video window visible, now that it is properly positioned
                hr = videoWin.put_Visible(DsHlp.OATRUE);
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                hr = mediaEvt.SetNotifyWindow(this.Handle, WM_GRAPHNOTIFY, IntPtr.Zero);
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);
                return true;
            }
            catch (Exception ee)
            {
                MessageBox.Show(this, "Could not setup video window\r\n"   ee.Message, "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                return false;
            }
        }

        /// <summary> 
        /// build the capture graph for grabber. 
        /// </summary>
        bool SetupGraph()
        {
            int hr;
            try
            {
                hr = capGraph.SetFiltergraph(graphBuilder);
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                hr = graphBuilder.AddFilter(capFilter, "Ds.NET Video Capture Device");
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                DsUtils.ShowCapPinDialog(capGraph, capFilter, this.Handle);

                AMMediaType media = new AMMediaType();
                media.majorType = MediaType.Video;
                media.subType = MediaSubType.RGB24;
                media.formatType = FormatType.VideoInfo;		// ???
                hr = sampGrabber.SetMediaType(media);
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                hr = graphBuilder.AddFilter(baseGrabFlt, "Ds.NET Grabber");
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                Guid cat = PinCategory.Preview;
                Guid med = MediaType.Video;
                hr = capGraph.RenderStream(ref cat, ref med, capFilter, null, null); // baseGrabFlt 
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                cat = PinCategory.Capture;
                med = MediaType.Video;
                hr = capGraph.RenderStream(ref cat, ref med, capFilter, null, baseGrabFlt); // baseGrabFlt 
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                media = new AMMediaType();
                hr = sampGrabber.GetConnectedMediaType(media);
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);
                if ((media.formatType != FormatType.VideoInfo) || (media.formatPtr == IntPtr.Zero))
                    throw new NotSupportedException("Unknown Grabber Media Format");

                videoInfoHeader = (VideoInfoHeader)Marshal.PtrToStructure(media.formatPtr, typeof(VideoInfoHeader));
                Marshal.FreeCoTaskMem(media.formatPtr); media.formatPtr = IntPtr.Zero;

                hr = sampGrabber.SetBufferSamples(false);
                if (hr == 0)
                    hr = sampGrabber.SetOneShot(false);
                if (hr == 0)
                    hr = sampGrabber.SetCallback(null, 0);
                if (hr < 0)
                    Marshal.ThrowExceptionForHR(hr);

                return true;
            }
            catch (Exception ee)
            {
                MessageBox.Show(this, "Could not setup graph\r\n"   ee.Message, "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                return false;
            }
        }

        /// <summary> 
        /// create the used COM components and get the interfaces. 
        /// </summary>
        bool GetInterfaces()
        {
            Type comType = null;
            object comObj = null;
            try
            {
                comType = Type.GetTypeFromCLSID(Clsid.FilterGraph);
                if (comType == null)
                    throw new NotImplementedException(@"DirectShow FilterGraph not installed/registered!");
                comObj = Activator.CreateInstance(comType);
                graphBuilder = (IGraphBuilder)comObj; comObj = null;

                Guid clsid = Clsid.CaptureGraphBuilder2;
                Guid riid = typeof(ICaptureGraphBuilder2).GUID;
                comObj = DsBugWO.CreateDsInstance(ref clsid, ref riid);
                capGraph = (ICaptureGraphBuilder2)comObj; comObj = null;

                comType = Type.GetTypeFromCLSID(Clsid.SampleGrabber);
                if (comType == null)
                    throw new NotImplementedException(@"DirectShow SampleGrabber not installed/registered!");
                comObj = Activator.CreateInstance(comType);
                sampGrabber = (ISampleGrabber)comObj; comObj = null;

                mediaCtrl = (IMediaControl)graphBuilder;
                videoWin = (IVideoWindow)graphBuilder;
                mediaEvt = (IMediaEventEx)graphBuilder;
                baseGrabFlt = (IBaseFilter)sampGrabber;
                return true;
            }
            catch (Exception ee)
            {
                MessageBox.Show(this, "Could not get interfaces\r\n"   ee.Message, "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                return false;
            }
            finally
            {
                if (comObj != null)
                    Marshal.ReleaseComObject(comObj); comObj = null;
            }
        }

        /// <summary> 
        /// create the user selected capture device. 
        /// </summary>
        bool CreateCaptureDevice(UCOMIMoniker mon)
        {
            object capObj = null;
            try
            {
                Guid gbf = typeof(IBaseFilter).GUID;
                mon.BindToObject(null, null, ref gbf, out capObj);
                capFilter = (IBaseFilter)capObj; capObj = null;
                return true;
            }
            catch (Exception ee)
            {
                MessageBox.Show(this, "Could not create capture device\r\n"   ee.Message, "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                return false;
            }
            finally
            {
                if (capObj != null)
                    Marshal.ReleaseComObject(capObj); capObj = null;
            }

        }

        /// <summary>
        /// 关闭摄像头 释放资源
        /// </summary>
        void stopCamera()
        {
            int hr;
            try
            {
                #if DEBUG
                if (rotCookie != 0)
                    DsROT.RemoveGraphFromRot(ref rotCookie);
                #endif

                if (mediaCtrl != null)
                {
                    hr = mediaCtrl.Stop();
                    mediaCtrl = null;
                }

                if (mediaEvt != null)
                {
                    hr = mediaEvt.SetNotifyWindow(IntPtr.Zero, WM_GRAPHNOTIFY, IntPtr.Zero);
                    mediaEvt = null;
                }

                if (videoWin != null)
                {
                    hr = videoWin.put_Visible(DsHlp.OAFALSE);
                    hr = videoWin.put_Owner(IntPtr.Zero);
                    videoWin = null;
                }

                baseGrabFlt = null;
                if (sampGrabber != null)
                    Marshal.ReleaseComObject(sampGrabber); sampGrabber = null;

                if (capGraph != null)
                    Marshal.ReleaseComObject(capGraph); capGraph = null;

                if (graphBuilder != null)
                    Marshal.ReleaseComObject(graphBuilder); graphBuilder = null;

                if (capFilter != null)
                    Marshal.ReleaseComObject(capFilter); capFilter = null;

                if (capDevices != null)
                {
                    foreach (DsDevice d in capDevices)
                        d.Dispose();
                    capDevices = null;
                }
            }
            catch (Exception)
            { }
        }

        /// <summary> 
        /// resize preview video window to fill client area. 
        /// </summary>
        void ResizeVideoWindow()
        {
            if (videoWin != null)
            {
                Rectangle rc = pbCamera.ClientRectangle;
                videoWin.SetWindowPosition(0, 0, rc.Right, rc.Bottom);
            }
        }

        /// <summary> 
        /// graph event (WM_GRAPHNOTIFY) handler. 
        /// </summary>
        void OnGraphNotify()
        {
            DsEvCode code;
            int p1, p2, hr = 0;
            do
            {
                hr = mediaEvt.GetEvent(out code, out p1, out p2, 0);
                if (hr < 0)
                    break;
                hr = mediaEvt.FreeEventParams(code, p1, p2);
            }
            while (hr == 0);
        }

        /// <summary>
        /// 启动摄像头
        /// </summary>
        private void startCamera()
        {
            if (!DsUtils.IsCorrectDirectXVersion())//检查DirectX版本
            {
                MessageBox.Show(this, "DirectX 8.1 NOT installed!", "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                this.Close(); return;
            }
            //检查摄像头设备
            if (!DsDev.GetDevicesOfCat(FilterCategory.VideoInputDevice, out capDevices))
            {
                MessageBox.Show(this, "No video capture devices found!", "DirectShow.NET", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                this.Close(); return;
            }

            //如果只有一个摄像头设备，则直接指定设备；若不止一个，则弹出设备列表，选择一个
            DsDevice dev = null;
            if (capDevices.Count == 1)
                dev = capDevices[0] as DsDevice;
            else
            {
                frmCameraSelector selector = new frmCameraSelector(capDevices);
                selector.ShowDialog(this);
                dev = selector.SelectedDevice;
            }

            if (dev == null)
            {
                this.Close(); return;

            }
            //开始视频
            if (!StartupVideo(dev.Mon))
                this.Close();
        }
        #endregion

        #region 接口实现
        /// <summary> sample callback, NOT USED. </summary>
        int ISampleGrabberCB.SampleCB(double SampleTime, IMediaSample pSample)
        {
            Trace.WriteLine("!!CB: ISampleGrabberCB.SampleCB");
            return 0;
        }

        /// <summary> buffer callback, COULD BE FROM FOREIGN THREAD. </summary>
        int ISampleGrabberCB.BufferCB(double SampleTime, IntPtr pBuffer, int BufferLen)
        {
            if (captured || (savedArray == null))
            {
                Trace.WriteLine("!!CB: ISampleGrabberCB.BufferCB");
                return 0;
            }

            captured = true;
            bufferedSize = BufferLen;
            Trace.WriteLine("!!CB: ISampleGrabberCB.BufferCB  !GRAB! size = "   BufferLen.ToString());
            if ((pBuffer != IntPtr.Zero) && (BufferLen > 1000) && (BufferLen <= savedArray.Length))
                Marshal.Copy(pBuffer, savedArray, 0, BufferLen);
            else
                Trace.WriteLine("    !!!GRAB! failed ");
            this.BeginInvoke(new CaptureDone(this.OnCaptureDone));
            return 0;
        }
        #endregion

        #region 构造
        public frmCamera()
        {
            InitializeComponent();
        }
        #endregion

        #region 事件
        /// <summary> 
        /// 重些 处理图像事件 
        /// </summary>
        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_GRAPHNOTIFY)
            {
                if (mediaEvt != null)
                    OnGraphNotify();
                return;
            }
            base.WndProc(ref m);
        }

        /// <summary>
        /// 启动或关闭摄像头
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnStart_Click(object sender, EventArgs e)
        {
            if (!_cameraIsStart)
            {
                pbPicture.SendToBack();
                startCamera();
                _cameraIsStart = true;
                btnStart.Text = "关闭摄像头";
                btnClap.Text = "拍照";
            }
            else
            {
                stopCamera();
                btnStart.Text = "启动摄像头";
                btnClap.Text = "拍照";
                _cameraIsStart = false;
                _reclap = false;
            }
        }

        /// <summary>
        /// 拍照
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnClap_Click(object sender, EventArgs e)
        {
            if (_cameraIsStart == true)
            {
                if (_reclap == false)
                {
                    Trace.WriteLine("!!BTN: toolBarBtnGrab");

                    if (savedArray == null)
                    {
                        int size = videoInfoHeader.BmiHeader.ImageSize;
                        if ((size < 1000) || (size > 16000000))
                            return;
                        savedArray = new byte[size   64000];
                    }

                    Image old = pbPicture.Image;
                    pbPicture.Image = null;
                    if (old != null)
                        old.Dispose();

                    captured = false;
                    int hr = sampGrabber.SetCallback(this, 1);

                    pbPicture.Image = theImage;
                    pbCamera.SendToBack();
                    _reclap = true;
                    btnClap.Text = "重拍";
                }
                else
                {
                    pbPicture.SendToBack();
                    btnClap.Text = "拍照";
                    _reclap = false;
                }
            }
        }
        #endregion

        [STAThread]
        static void Main()
        {
            Application.Run(new frmCamera());
        }
    }