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   源码介绍

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Threading;
using System.Net.Sockets;
using System.Net.PeerToPeer;
using System.Net;
using System.IO;
using System.Drawing.Imaging;
using P2PVideo.Properties;

namespace P2PVideo
{

    public partial class MainForm : Form
    {
        /************摄像机用****************/
        //摄像机对象
        WebCamera myCamera = new WebCamera();
        //摄像机编号
        int device_number = 0;

        //是否正在预览
        bool bLocalShow = false;
        //是否进行视频呼叫
        bool bCallRemote = false;

        IDataObject data;
        Image bmap;
        User user;
        /************对等通信用*************/
        //自定义对等点名称
        String strpeerName = "Myp2pVedio";
        TcpListener listener;
        List<ListViewItem> resolvedListViewItem = new List<ListViewItem>();

        TcpClient localclient;
        BinaryWriter localbw;
        BinaryReader localbr;
        NetworkStream localsr;
        String remotePort = "";
        String remoteIP = "";

        Thread thredRece;
        Thread thredListen;

        MemoryStream receiveMS;
        int receiveLength;

        UdpChat udpChat;
        bool isExit = false;

        static int listViewWidth = 225;
        public MainForm()
        {
            InitializeComponent();
            this.FormBorderStyle = FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;

            registerAndResolve();
            udpChat = new UdpChat(this);
        }

        private void registerAndResolve()
        {
            getPort();
            //将本应用使用的IP地址及端口号，注册到群中
            if (!MyPNRP.registerPeer(strpeerName))
                MessageBox.Show("未开启点对点服务");

            //定期解析对等点所在群的同名对等节点的信息
            Thread resolveThread = new Thread(Resolve);
            resolveThread.Start();
            resolveThread.IsBackground = true;
            Start_Receiving_Video_Conference();
        }

        /// <summary>
        /// 获取一个可用端口号，启动监听
        /// </summary>
        public void getPort()
        {
            while (true)
            {
                //设置本应用使用的端口号
                MyPNRP.port = new Random().Next(50000, 51000);
                try
                {
                    listener = new TcpListener(IPAddress.Any, MyPNRP.port);
                    listener.Start();
                }
                catch
                {
                    continue;
                }
                break;
            }
        }

        /// <summary>
        /// 解析名称
        /// </summary>
        private void Resolve()
        {
            while (!isExit)
            {
                PeerNameRecordCollection recColl = MyPNRP.ResolverPeer(strpeerName);
                resolvedListViewItem.Clear();

                foreach (PeerNameRecord record in recColl)
                {
                    foreach (IPEndPoint endP in record.EndPointCollection)
                    {
                        if (endP.AddressFamily.Equals(AddressFamily.InterNetwork))
                        {

                            ListViewItem item1 = new ListViewItem(endP.ToString());

                            resolvedListViewItem.Add(item1);
                        }
                    }
                }

                //检查是否有其他终端退出，如已经退出则从列表中删除该项
                if (resolvedListViewItem.Count == 0)
                    ClearItems();
                else
                    RemoveItem();

                foreach (PeerNameRecord record in recColl)
                {
                    foreach (IPEndPoint endP in record.EndPointCollection)
                    {
                        if (endP.AddressFamily.Equals(AddressFamily.InterNetwork))
                        {
                            ListViewItem item1 = new ListViewItem(endP.ToString());
                            AppendItem(item1);
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 界面控制
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void buttonShowUsers_Click(object sender, EventArgs e)
        {
            splitContainer1.Panel1Collapsed = !splitContainer1.Panel1Collapsed;
            //由展开变为折叠
            if (splitContainer1.Panel1Collapsed)
            {
                this.ClientSize = new Size(this.ClientSize.Width - 200, this.ClientSize.Height);
                splitContainer1.Width = buttonShowUsers.Width;
                buttonShowUsers.Image = Properties.Resources.MovePreviousHS;
            }
            //由折叠变为展开
            else
            {
                this.ClientSize = new Size(this.ClientSize.Width   200, this.ClientSize.Height);
                buttonShowUsers.Image = Properties.Resources.MoveNextHS;
                splitContainer1.SplitterDistance = this.listViewUsers.Width;
            }
        }

        /// <summary>
        /// 界面控制
        /// </summary>
        private void buttonShowVideo_Click(object sender, EventArgs e)
        {
            splitContainer2.Panel2Collapsed = !splitContainer2.Panel2Collapsed;
            ////由展开变为折叠
            if (splitContainer2.Panel2Collapsed)
            {
                this.ClientSize = new Size(this.ClientSize.Width - 220, this.ClientSize.Height);
                buttonShowVideo.Image = Properties.Resources.MoveNextHS;
                splitContainer1.SplitterDistance = listViewWidth;
            }
            ////由折叠变为展开
            else
            {
                this.ClientSize = new Size(this.ClientSize.Width   220, this.ClientSize.Height);
                buttonShowVideo.Image = Properties.Resources.MovePreviousHS;
                splitContainer1.SplitterDistance = listViewWidth;
            }
        }

        private void buttonSend_Click(object sender, EventArgs e)
        {
            try
            {
                remoteIP = listViewUsers.SelectedItems[0].ToString().Split(':')[1];
                remoteIP = remoteIP.Substring(2, remoteIP.Length - 2);
                udpChat.sendData(remoteIP, remotePort, this.richTextBoxSend.Text);
            }
            catch
            {
                MessageBox.Show("选择正确接收方！");
            }
        }

        /// <summary>
        /// 清空按钮
        /// </summary>
        private void buttonClose_Click(object sender, EventArgs e)
        {
            this.richTextBoxSend.Text = "";
        }

        /// <summary>
        /// 视频呼叫/取消呼叫
        /// </summary>
        private void buttonVedioCall_Click(object sender, EventArgs e)
        {
            if (!bCallRemote)
            {
                //询问远程主机是否接受呼叫请求
                try
                {
                    remotePort = this.listViewUsers.SelectedItems[0].ToString().Split(':')[2].Substring(0, 5);
                    remoteIP = listViewUsers.SelectedItems[0].ToString().Split(':')[1];
                    remoteIP = remoteIP.Substring(2, remoteIP.Length - 2);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                    MessageBox.Show("未选择远程主机");
                    return;
                }
                
                //尝试打开本地摄像头进行预览
                if (bLocalShow == false && Start_Sending_Video_Conference())
                {
                    if (LocalVedioShow())
                    {
                        bLocalShow = true;
                        this.buttonLocalShow.Text = "取消预览";
                    }
                }
            }
            else
            {
                labelTips.Text = "视频中断";
                if (localclient != null)
                {
                    try
                    {
                        timerSend.Stop();
                        buttonLocalShow_Click(null, null);
                        localbw.Write("Stop:false");
                        localclient.Close();
                        localbw.Close();
                        localsr.Close();
                        localbr.Close();
                    }
                    catch (Exception ex)
                    {
                        //发生异常意味着远程连接已经关闭，无需视频中断
                        Console.WriteLine(ex.ToString());
                    }
                }
                this.buttonVedioCall.Text = "视频呼叫";
                bCallRemote = false;
            }
        }

        /// <summary>
        /// 开始发送数据
        /// </summary>
        private bool Start_Sending_Video_Conference()
        {
            try
            {
                localclient = new TcpClient(remoteIP, int.Parse(remotePort));//Connecting with server
                localsr = localclient.GetStream();
                localbw = new BinaryWriter(localsr);
                localbr = new BinaryReader(localsr);
                localbw.Write("Query:false");
                if (localbr.ReadString() == "OK:false")
                {
                    timerSend.Enabled = true;
                    timerSend.Start();
                    labelTips.Text = "开始视频发送";
                    this.buttonVedioCall.Text = "中断视频";
                    bCallRemote = true;
                    return true;
                }
                else
                {
                    this.buttonVedioCall.Text = "视频呼叫";
                    labelTips.Text = "远程主机未对视频请求做出响应";
                    localbw.Close();
                    localbr.Close();
                    return false;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                this.buttonVedioCall.Text = "视频呼叫";
                labelTips.Text = "远程主机未对视频请求做出响应";
                return false;
            }
        }

        /// <summary>
        /// 准备接收视频
        /// </summary>
        private void Start_Receiving_Video_Conference()
        {
            thredListen = new Thread(ReceiveConnect); // Start Thread Session
            thredListen.Start();
            thredListen.IsBackground = true;
        }

        /// <summary>
        /// 接收连接请求
        /// </summary>
        private void ReceiveConnect()
        {
            while (!isExit)
            {
                TcpClient remoteClient = listener.AcceptTcpClient();
                isExit = false;
                user = new User(remoteClient);
                thredRece = new Thread(ReceiveMessage);
                thredRece.IsBackground = true;
                thredRece.Start(user);
            }
        }

        /// <summary>
        /// 接收信息
        /// </summary>
        private void ReceiveMessage(Object myUser)
        {
            User user = (User)myUser;
            while (!isExit)
            {
                //保存接收的命令字符串
                string receiveString = null;
                //解析命令用
                //每条命令均带有一个参数，值为true或者false，表示是否有紧跟的字节数组
                string[] splitString = null;
                byte[] receiveBytes = null;
                try
                {
                    //从网络流中读出命令字符串
                    //此方法会自动判断字符串长度前缀，并根据长度前缀读出字符串
                    receiveString = user.br.ReadString();
                    splitString = receiveString.Split(':');
                    if (splitString[1] == "true")
                    {
                        //先从网络流中读出32位的长度前缀
                        receiveLength = user.br.ReadInt32();
                        //然后读出指定长度的内容保存到字节数组中
                        receiveBytes = user.br.ReadBytes(receiveLength);
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                    this.pictureBoxFriend.Image = (System.Drawing.Image)Resources.ResourceManager.GetObject("vedio");
                    break;
                    //底层套接字不存在时会出现异常
                    SetlabelTips("接收数据失败");
                }
                if (receiveString == null)
                {
                    if (isExit == false)
                    {
                        this.pictureBoxFriend.Image = (System.Drawing.Image)Resources.ResourceManager.GetObject("vedio");
                        SetlabelTips("接收数据失败");
                    }
                    break;
                }
                SetlabelTips("收到："   receiveString);
                switch (splitString[0])
                {
                    case "Query":
                        //询问是否接受视频请求
                        if (MessageBox.Show(String.Format("接收{0}视频请求", user.remoteClient.Client.RemoteEndPoint), "消息", MessageBoxButtons.YesNo) == DialogResult.Yes)
                        {
                            user.bw.Write("OK:false");
                        }
                        else
                            user.bw.Write("NO:false");
                        break;

                    case "Image":
                        //传递图片
                        try
                        {
                            //利用接收到得字节数组创建内存流
                            receiveMS = new MemoryStream(receiveBytes);
                            //从流中获取图片
                            this.pictureBoxFriend.Image = Image.FromStream(receiveMS);
                            //关闭内存流
                            receiveMS.Close();
                            //清空内存流
                            receiveMS.Flush();
                            //重置内存流
                            receiveMS = null;
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show("接收图片错误");
                            Console.WriteLine(ex.ToString());
                            break;
                        }
                        break;
                    case "Stop":
                        //停止接收视频
                        this.pictureBoxFriend.Image = (System.Drawing.Image)Resources.ResourceManager.GetObject("vedio");
                        isExit = true;
                        break;
                    default:
                        break;
                }
            }
        }
        /// <summary>
        /// 视频预览事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void buttonLocalShow_Click(object sender, EventArgs e)
        {
            //开始预览
            if (bLocalShow == false)
            {
                if (LocalVedioShow())
                {
                    bLocalShow = true;
                    this.buttonLocalShow.Text = "取消预览";
                }

            }
            //停止视频预览
            else
            {
                myCamera.ClosePreviewWindow();
                bLocalShow = false;
                this.buttonLocalShow.Text = "本地预览";
            }
        }

        /// <summary>
        /// 显示本地视频
        /// </summary>
        /// <returns>摄像头是否运行正常</returns>
        private bool LocalVedioShow()
        {
            //设定设备信息
            myCamera.IDevice = device_number;
            //开始在本地预览显示
            if (!myCamera.OpenPreviewWindow(this.picCaptureMine))
            {
                MessageBox.Show("视频预览失败！请检查摄像头设备是否连接正常，驱动是否安装！");
                return false;
            }
            return true;
        }

        /// <summary>
        /// 窗体关闭
        /// </summary>
        private void FormP2P_FormClosing(object sender, FormClosingEventArgs e)
        {
            isExit = true;
            if (timerSend.Enabled)
            {
                timerSend.Stop();
                timerSend.Enabled = false;
            }
            if (localclient != null)
            {
                if (localclient.Connected)
                    localclient.Close();
            }
            if (user != null)
            {
                user.remoteClient.Close();
                user.br.Close();
                user.bw.Close();
            }
            myCamera.ClosePreviewWindow();
        }


        /// <summary>
        /// 发送视频数据
        /// </summary>
        private void Send_One_Capture(BinaryWriter bw)
        {
            //将字节数组存放到内存流中
            MemoryStream ms = new MemoryStream();
            try
            {
                //将摄像头的一帧数据存放到剪贴板中
                myCamera.CaptureWindow();
                //从剪贴板中获取图片
                data = Clipboard.GetDataObject();
                //将截图存放到内存流中
                if (data.GetDataPresent(typeof(System.Drawing.Bitmap)))
                {
                    bmap = ((Image)(data.GetData(typeof(System.Drawing.Bitmap))));
                    bmap.Save(ms, ImageFormat.Bmp);
                }
                //将截图以JPEG形式保存到内存流中
                this.picCaptureMine.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                //从流中获取字节数组
                byte[] arrImage = ms.GetBuffer();
                bw.Write("Image:true");
                //写入数据长度
                bw.Write(arrImage.Length);
                //发送图片
                bw.Write(arrImage);
                ms.Flush();
                bw.Flush();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                buttonVedioCall_Click(null, null);
                bw.Close();
            }
            ms.Close();
        }

        private void timerSend_Tick(object sender, EventArgs e)
        {
            Send_One_Capture(localbw);
        }

        /// <summary>
        /// 多线程访问控件
        /// </summary>
        /// <param name="item"></param>
        delegate void AppendItemDelegate(ListViewItem item);
        public void AppendItem(ListViewItem item)
        {
            if (listViewUsers.InvokeRequired)
            {
                AppendItemDelegate d = AppendItem;
                listViewUsers.Invoke(d, item);
            }
            else
            {
                Boolean exist = false;
                foreach (ListViewItem myitem in listViewUsers.Items)
                {
                    if (myitem.Text.Equals(item.Text))
                    {
                        exist = true;
                    }
                }
                if (!exist)
                    listViewUsers.Items.Add(item);
            }
        }

        /// <summary>
        /// 删除已经推出对等点的ListItem项
        /// </summary>
        delegate void RemoveItemDelegate();
        public void RemoveItem()
        {
            if (listViewUsers.InvokeRequired)
            {
                RemoveItemDelegate d = RemoveItem;
                listViewUsers.Invoke(d);
            }
            else
            {
                bool exist;
                foreach (ListViewItem itemUser in listViewUsers.Items)
                {
                    exist = false;
                    foreach (ListViewItem itemResolveNew in resolvedListViewItem)
                    {
                        if (itemUser.Text.Equals(itemResolveNew.Text))
                        {
                            exist = true;
                            break;

                        }
                    }
                    if (!exist)
                        listViewUsers.Items.Remove(itemUser);
                }
            }
        }

        /// <summary>
        /// 清空所有ListItem项
        /// </summary>
        delegate void ClearItemDelegate();
        public void ClearItems()
        {
            if (listViewUsers.InvokeRequired)
            {
                ClearItemDelegate d = ClearItems;
                listViewUsers.Invoke(d);
            }
            else
            {
                listViewUsers.Items.Clear();
            }
        }

        /// <summary>
        /// 清空发送框
        /// </summary>
        delegate void ClearRichTextBoxSendDelegate();
        public void ClearRichTextBox()
        {
            if (this.richTextBoxSend.InvokeRequired)
            {
                ClearRichTextBoxSendDelegate d = ClearRichTextBox;
                richTextBoxSend.Invoke(d);
            }
            else
            {
                richTextBoxSend.Clear();
                richTextBoxSend.Focus();
            }
        }

        delegate void SetRichTextBoxReceiveDelegate(String text);
        public void SetRichTextBoxReceive(String text)
        {
            if (this.richTextBoxSend.InvokeRequired)
            {
                SetRichTextBoxReceiveDelegate d = SetRichTextBoxReceive;
                this.richTextBoxReceive.Invoke(d, text);
            }
            else
            {
                richTextBoxReceive.AppendText(text);
                richTextBoxReceive.AppendText(Environment.NewLine);
            }
        }

        delegate void SetlabelTipsDelegate(String text);
        public void SetlabelTips(String text)
        {
            if (this.labelTips.InvokeRequired)
            {
                SetlabelTipsDelegate d = SetlabelTips;
                this.labelTips.Invoke(d, text);
            }
            else
            {
                labelTips.Text  = text;
            }
        }
    }
}