C#局域视频，资源源捕获源固定

因为我的电脑有一个类似于电视的资源源，还有2个摄像头。每次测试我这个局域视频功能的时候，总会出现一个对话框“资源源->捕获源”，然后让我选择这3个资源的哪一个。

有没有什么办法让我直接固定到我的一个摄像头上，以后直接使用呢？

新手，一下是Video类和开启视频功能的代码





using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Runtime.InteropServices;

using System.Drawing.Imaging;

using System.Drawing;



namespace video

{

    public class Video

    {

        //5个传入参数

        private IntPtr myHand;

        private int myWidth;

        private short myHeight;

        private int myLeft;

        private int myTop;

        //调用avicap32.dll 

        public struct videohdr_tag

        {

            public byte[] lpData;

            public int dwBufferLength;

            public int dwBytesUsed;

            public int dwTimeCaptured;

            public int dwUser;

            public int dwFlags;

            public int[] dwReserved;



        }

        [DllImport("avicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]

        public static extern int capCreateCaptureWindowA([MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);

        [DllImport("avicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]

        public static extern bool capGetDriverDescriptionA(short wDriver, [MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszName, int cbName, [MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszVer, int cbVer);

        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]

        public static extern bool DestroyWindow(int hndw);

        [DllImport("user32", EntryPoint = "SendMessageA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]

        public static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)]   object lParam);

        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]

        public static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);

        [DllImport("vfw32.dll")]

        public static extern string capVideoStreamCallback(int hwnd, videohdr_tag videohdr_tag);

        [DllImport("vicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]

        public static extern bool capSetCallbackOnFrame(int hwnd, string s);

        //自定义参数：

        private int hHwnd;

        //构造函数

        public Video(IntPtr myPtr, int left, int top, int width, short height)

        {

            myHand = myPtr;

            myLeft = left;

            myTop = top;

            myWidth = width;

            myHeight = height;

            //

            // TODO: 在此处添加构造函数逻辑

            //

        }



        //打开视频：

        public void opVideo()

        {

            int intDevice = 0;

            string refDevice = intDevice.ToString();

            //MessageBox.Show("1");

            hHwnd = capCreateCaptureWindowA(ref refDevice, 1342177280, 0, 0, 1024, 768, myHand.ToInt32(), 0);

            //MessageBox.Show("2");

            if (SendMessage(hHwnd, 0x40a, intDevice, 0) > 0)

            {

                //MessageBox.Show("9");

                SendMessage(this.hHwnd, 0x435, -1, 0);//设置预览规模

                //MessageBox.Show("3");

                SendMessage(this.hHwnd, 0x434, 100, 0);//设置以毫秒计算预览率

                //MessageBox.Show("4");

                SendMessage(this.hHwnd, 0x432, -1, 0);//设置预览,开始预览从相机的图像/capCreateCaptureWindowAppppppppppppppppppppl

                //MessageBox.Show("5");

                SetWindowPos(this.hHwnd, 1, 0, 0, myWidth, Convert.ToInt32(myHeight), 6);



                //MessageBox.Show("6");

            }

            else

            {

                DestroyWindow(this.hHwnd);

            }

        }



        //停止视频

        public void CloVideo()

        {

            SendMessage(this.hHwnd, 0x40b, 0, 0);

            DestroyWindow(this.hHwnd);

        }



        //捕获视频

        public Image CatchVideo()

        {

            SendMessage(this.hHwnd, 0x41e, 0, 0);

            IDataObject obj1 = Clipboard.GetDataObject();

            //MessageBox.Show(this.hHwnd.ToString());

            Image getIma = null;

            if (obj1.GetDataPresent(typeof(Bitmap)))

            {

                Image image1 = (Image)obj1.GetData(typeof(Bitmap));

                getIma = image1;

            }



            return getIma;

        }

        public void GrabImage(string path)

        {

            try

            {

                IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);

                SendMessage(hHwnd, 0x400 + 25, 0, hBmp.ToInt64());

            }

            catch

            {

            }

        }



    }

}



 public Form1(String IP)

        {

            InitializeComponent();

            Video = new Video(Image_small.Handle, this.Image_small.Left, this.Image_small.Top, this.Image_small.Width, (short)this.Image_small.Height);

            IP_udp = IP;

        }



        private void Form1_Load(object sender, EventArgs e)

        {

            threadVideo = new Thread(new ThreadStart(this.StartListenVideo));

            threadVideo.IsBackground = true;

            threadVideo.Start();



            Video.opVideo();

            timer.Enabled = true;

        }



        public void VideoInvoke()

        {

            this.Image_big.Image = this.ReceivedImage;

        }



        public void StartListenVideo()

        {

            udpclient = new UdpClient(12000);

            IPEndPoint ipendpoint = new IPEndPoint(ip, 12000);

            while (true)

            {



                try

                {

                    byte[] bytes = udpclient.Receive(ref ipendpoint);

                    MemoryStream ms = new MemoryStream(bytes);

                    ReceivedImage = Image.FromStream(ms);

                    this.Image_big.Invoke(new MyDelegate(this.VideoInvoke));

                }

                catch (Exception ex)

                {

                }

            }

        }



        private void timer_Tick(object sender, EventArgs e)

        {

            VideoImage = Video.CatchVideo();

            imgSender.SendImage(IP_udp, 13000, VideoImage);

        }



        private void Form1_FormClosing(object sender, FormClosingEventArgs e)

        {

            udpclient.Close();

            threadVideo.Abort();

        }

--------------------编程问答-------------------- 如果你的系统里装有多个捕获设备, 你可以在发送WM_CAP_DRIVER_CONNECT消息时用wParam参数指定使用哪一个, 此参数是登记在SYSTEM.INI文件的[drivers]一节里的列表中的某一项, 0为第一个.
SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, 0, 0); --------------------编程问答--------------------

引用 1 楼 zdbb 的回复:

如果你的系统里装有多个捕获设备, 你可以在发送WM_CAP_DRIVER_CONNECT消息时用wParam参数指定使用哪一个, 此参数是登记在SYSTEM.INI文件的[drivers]一节里的列表中的某一项, 0为第一个.
SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, 0, 0);

还是不懂，没能成功，
跟capGetDriverDescriptionA ， capCreateCaptureWindowA没有关系吗？ --------------------编程问答-------------------- 你本地是不是有多个摄像头设备！ --------------------编程问答--------------------

本地2个摄像头,默认打开第1个摄像头,如何选第2个?求教大大!
SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, intDevice , 0);
使用第一个摄像头时,intDevice=0;使用第2个时,intDevice=1不行;
另:system.ini里未找到drivers节
     /// <summary>
    ///开始载入视频
    /// </summary>
    public bool OpenCapture(Panel pnlVideo, int intDevice)   //开始载入视频
    {

        bool videostart = false;
        int intWidth = pnlVideo.Width;
        int intHeight = pnlVideo.Height;
        //第1个摄像头================
        string refDevice = intDevice.ToString();

        //创建视频窗口并得到句柄
        hHwnd = Camera.capCreateCaptureWindowA(ref refDevice, 1342177280, 0, 0, 640, 480, pnlVideo.Handle.ToInt32(), 0);
        SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, intDevice, 0);

        SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, intDevice , 0);
        SendMessage(hHwnd, WM_CAP_SET_PREVIEW,true , 0);
        if (SendMessage(hHwnd, 0x40a, intDevice, 0) > 0)
        {
            SendMessage(hHwnd, 0x435, -1, 0);
            SendMessage(hHwnd, 0x434, 0x01, 0);
            SendMessage(hHwnd, 0x432, -1, 0);
            SetWindowPos(hHwnd, 1, 0, 0, intWidth, intHeight, 6);
            videostart = true;
        }
        else
        {
            Camera.DestroyWindow(hHwnd);
            videostart = false;
            MessageBox.Show("加载视频失败,请检查是否有安装设备！", "拍照");
        }
        return videostart;
    }

补充：.NET技术 ,  C#