小记：针对目前功能越来越强大的智能手机来说，在PC端支持对手机中的用户数据作同步、备份以及恢复等保护措施的应用已经急需完善。不仅要对数据作保护，而且用户更希望自己的手机跟PC能够一体化，以及和远程服务器的一体化。用户希望在手机端的操作能够转移到PC端，对于PC端大屏幕的电脑来说，完成同样的操作可以大量的节省用户的时间。对于功能强大的手机来说，有近1/2的应用可以在PC端同步。所以对PC端应用的规划要以系统的角度来对待。同时要保证手机端和PC端的主流交互模式应保持一致。个人观点:数据的一体化和管理的多元化是以后发展的一个趋势。下面进行今天的学习，今天的实验室移动端和PC端的数据交互及解析。

1，如何实现移动端和PC端的数据交互？

　　答：1，蓝牙   2，NFC技术　3，红外　4，Socket.

NFC和蓝牙的异同点:

　　相同点:都是近距离传输。

　　不同点: NFC优于红外和蓝牙传输方式。作为一种面向消费者的交易机制，NFC比红外更快、更可靠而且简单得多，不用向红外那样必须严格的对齐才能传输数据。与蓝牙相比，NFC面向近距离交易，适用于交换财务信息或敏感的个人信息等重要数据；蓝牙能够弥补NFC通信距离不足的缺点，适用于较长距离数据通信。因此，NFC和蓝牙互为补充，共同存在。事实上，快捷轻型的NFC 协议可以用于引导两台设备之间的蓝牙配对过程，促进了蓝牙的使用。但是要实现远距离的数据传输那就只能用Socket了，

下面进行代码的分析:

首先在PC上建立服务端Server.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace TcpServer
{
    class Program
    {
        public static Socket serverSocket;
        static Thread threadSend;
        static Thread sendDataToClient;
        static int count = 1;
        static void Main(string[] args)
        {
            //确定端口号
            int port = 121;

            //设定连接IP
            string host = "192.168.1.100";

            //将IP地址字符串转化为IP地址实例
            IPAddress ip = IPAddress.Parse(host);

            //将网络端点表示为 IP 地址和端口号
            IPEndPoint ipe = new IPEndPoint(ip, port);

            //建立Socket
            //addressFamily 参数指定 Socket 类使用的寻址方案
            //socketType 参数指定 Socket 类的类型
            //protocolType 参数指定 Socket 使用的协议。
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            //socket与本地终结点建立关联
            socket.Bind(ipe);
            while (true)
            {
                //开始监听端口
                socket.Listen(0);

                Console.WriteLine("服务已开启,请等待....." + DateTime.Now.ToString() + DateTime.Now.Millisecond.ToString());

                //为新建的连接建立新的Socket目的为客户端将要建立连接
                serverSocket = socket.Accept();
                Console.WriteLine("连接已建立......" + DateTime.Now.ToString() + DateTime.Now.Millisecond.ToString());
                Console.WriteLine("客户端IP:"+serverSocket.RemoteEndPoint);
                string recStr =string.Empty;
                //定义缓冲区用于接收客户端的数据
                byte[] recbyte = new byte[1024];

                ReceiveData();

                sendDataToClient = new Thread(sendData);
                sendDataToClient.Start();

            }
        }

        public static void sendData()
        {

            while (true)
            {
                Console.WriteLine("send to client\n");
                //服务端给客户端回送消息
                string strSend = "Hello Android Client!" + DateTime.Now.Second;
                //string strSend = "HelloClient1HelloClient2HelloClient3HelloClient4HelloClient5HelloClient6HelloClient7HelloClient8HelloClient9HelloClient10HelloClient11HelloClien12HelloClien13HelloClien14HelloClien15HelloClient16";
                byte[] sendByte = new byte[1024];
                //将发送的字符串转换为byte[]
                sendByte = UTF8Encoding.UTF8.GetBytes(strSend);
                //服务端发送数据

                serverSocket.Send(sendByte, sendByte.Length, 0);
                Thread.Sleep(1000);
            }
        }

        #region
        /// <summary>
        /// 异步连接
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="port"></param>
        /// <param name="clientSocket"></param>
        public static void Connect(IPAddress ip, int port)
        {
            serverSocket.BeginConnect(ip, port, new AsyncCallback(ConnectCallback), serverSocket);
        }

        private static void ConnectCallback(IAsyncResult ar)
        {
            try
            {
                Socket handler = (Socket)ar.AsyncState;
                handler.EndConnect(ar);
            }
            catch (SocketException ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// 发送数据
        /// </summary>
        /// <param name="data"></param>
        public static void Send(string data)
        {
            //Send(System.Text.Encoding.UTF8.GetBytes(data));
            Send(UTF8Encoding.UTF8.GetBytes(data));
        }
        /// <summary>
        /// 发送数据
        /// </summary>
        /// <param name="byteData"></param>
        private static void Send(byte[] byteData)
        {
            try
            {
                int length = byteData.Length;
                byte[] head = BitConverter.GetBytes(length);
                byte[] data = new byte[head.Length + byteData.Length];
                Array.Copy(head, data, head.Length);
                Array.Copy(byteData, 0, data, head.Length, byteData.Length);
                serverSocket.BeginSend(data, 0, data.Length, 0, new AsyncCallback(SendCallback), serverSocket);
            }
            catch (SocketException ex)
            { }
        }

        private static void SendCallback(IAsyncResult ar)
        {
            try
            {
                Socket handler = (Socket)ar.AsyncState;
                handler.EndSend(ar);
            }
            catch (SocketException ex)
            {
                throw ex;
            }
        }

        static byte[] MsgBuffer = new byte[128];

        /// <summary>
        /// 接收消息
        /// </summary>
        public static void ReceiveData()
        {
            if (serverSocket.ReceiveBufferSize > 0)
            {
                serverSocket.BeginReceive(MsgBuffer, 0, MsgBuffer.Length, 0, new AsyncCallback(ReceiveCallback), null);
            }
        }

        private static void ReceiveCallback(IAsyncResult ar)
        {
            try
            {
                int REnd = serverSocket.EndReceive(ar);
                Console.WriteLine("长度:" + REnd);
                if (REnd > 0)
                {
                    byte[] data = new byte[REnd];
                    Array.Copy(MsgBuffer, 0, data, 0, REnd);

                    int Msglen = data.Length;
                    //在此次可以对data进行按需处理

                    serverSocket.BeginReceive(MsgBuffer, 0, MsgBuffer.Length, 0, new AsyncCallback(ReceiveCallback), null);
                    //Console.WriteLine("接收服务端的信息:{0}", Encoding.ASCII.GetString(MsgBuffer, 0, Msglen));

                    Console.WriteLine("接收服务端的信息:{0}", UTF8Encoding.UTF8.GetString(data, 0, Msglen));
                }
                else
                {
                    dispose();
                }
            }
            catch (SocketException ex)
            { }
        }

        private static void dispose()
        {
            try
            {
                serverSocket.Shutdown(SocketShutdown.Both);
                serverSocket.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion
    }
}

移动端使用Unity3D写的脚本挂在mainCamera上，代码如下:

using UnityEngine;
using System.Collections;
using System.Net.Sockets;
using System.Net;
using System;
using System.Text;
using System.IO;

public class client : MonoBehaviour
{
    public GUIText text;
    public GUIText path;

    public static Socket clientSocket;
    // Use this for initialization
    void Start ()
    {
　　　　 //服务器IP
        string LocalIP = "192.168.1.100";　　　　 //端口号
        int port = 121;
        IPAddress ip =IPAddress.Parse(LocalIP);
        IPEndPoint ipe = new IPEndPoint(ip,port);
        clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//建立客户端Socket
        clientSocket.Connect(ipe);
        StartCoroutine("sendData"); //启动协同程序
        StartCoroutine("getInfo");  

    }

    // Update is called once per frame
    void Update ()
    {
        if(Input.GetKey(KeyCode.Escape)||Input.GetKey(KeyCode.Home))
        {
            Application.Quit();
        }
    }
    void OnGUI()
    {
        if(GUI.Button(new Rect(Screen.width/2-40,30,100,60),"截图"))
        {
            StartCoroutine("GetCapture");
        }
    }

    IEnumerator GetCapture ()
    {
        yield return new WaitForEndOfFrame();
        int width = Screen.width;
        int height = Screen.height;
        Texture2D tex = new Texture2D (width, height, TextureFormat.RGB24, false);
        tex.ReadPixels (new Rect (0, 0, width, height), 0, 0, true);
        byte[] imagebytes = tex.EncodeToPNG ();//转化为png图
        tex.Compress (false);//对屏幕缓存进行压缩
        //image.mainTexture = tex;//对屏幕缓存进行显示（缩略图）
        string PicPath="storage";
        File.WriteAllBytes (Application.persistentDataPath+"/"+Time.time+ ".png", imagebytes);//存储png图
        path.text = Application.persistentDataPath+"/";
    }

    /// <summary>
    /// 向服务器发送消息
    /// </summary>
    /// <returns>The data.</returns>
    public IEnumerator sendData()
    {
        int i=0;
        while(true)
        {
            string sendStr = i.ToString()+"你好 server,I am Android";
            byte[] sendBytes = UTF8Encoding.UTF8.GetBytes(sendStr);
            clientSocket.Send(sendBytes);
            i++;
            yield return new WaitForSeconds(1f);
        }
    }
    /// <summary>
    /// 得到服务器回应
    /// </summary>
    /// <returns>The info.</returns>
    public IEnumerator getInfo()
    {
        while(true)
        {
            byte[] revBytes = new byte[1024];
            int bytes = clientSocket.Receive(revBytes, revBytes.Length, 0);
            string revStr ="";
            //revStr += Encoding.ASCII.GetString(revBytes, 0, bytes);
            revStr += UTF8Encoding.UTF8.GetString(revBytes,0,bytes);
            Debug.Log ("接收到服务器消息:"+revStr);
            text.text = "From Server:"+revStr;
            yield return null;
        }
　　}
}

服务器端运行结果:

服务器回送消息代码:string strSend = "Hello Android Client!" + DateTime.Now.Second;

局域网下测试没有什么问题，以后无论是做应用还是网络游戏肯定少不了的是Socket网络数据传输，多了解点网络知识还是很有必要的尤其是TCP协议，如有错误，欢迎指正。