C# 建立Socket连接 持续发送屏幕截图

写的一个demo,建立Socket连接之后，循环发送电脑屏幕截图 

服务器端开启之后监听端口号2000，为新建连接创建新的Socket。之后从客户端接收截图，判断一张图片接收结束之后。将图片显示于pictureBox控件上。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace server
{
public partial class Form1 : Form
{
public Thread mythread;
public int shu = 0;
public Form1()
{
InitializeComponent();
//  CheckForIllegalCrossThreadCalls = false; 不需要
}

public Socket nect(int port, string host)
{
IPAddress ip = IPAddress.Parse(host);
IPEndPoint ipe = new IPEndPoint(ip, port);
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket类    
s.Bind(ipe);//绑定2000端口     
s.Listen(0);//开始监听 
Socket temp = s.Accept();//为新建连接创建新的Socket。 
return temp;
}
public void look(object s)
{
Socket temp = (Socket)s;
byte[] buffer = new byte[1024];
while (true)
{
try
{
MemoryStream ms = new MemoryStream();
// Thread.Sleep(1000);
int end = 1;
while (end != 0)
{
shu = temp.Receive(buffer, buffer.Length, 0);//从客户端接受信息
if (shu == 5)
end = 0;
else
ms.Write(buffer, 0, 1024);
}
pictureBox1.Image = Bitmap.FromStream(ms);
ms.Dispose();
}
catch(System.ArgumentException  e)
{

}
}
}
//开启
private void button1_Click(object sender, EventArgs e)
{
int port = 2000;
string host = "127.0.0.1";
Socket temp = nect(port, host);

mythread = new Thread(new ParameterizedThreadStart(look));
mythread.Start(temp);

}

}
}

客户端连接到服务器后，获取屏幕截图之后，设置图片的大小和清晰度，并循环发送截图。

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Drawing;
using System.Windows.Forms;
using System.CodeDom;
using System.Drawing.Imaging;
using System.Drawing.Design;
using System.Text;
using System.Threading;

namespace client
{
class Program
{
static void Main(string[] args)
{
int port = 2000; 
            string host = "127.0.0.1";
Socket c=connect(port, host);

Bitmap bt = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Graphics g= Graphics.FromImage(bt);
while(true)//循环发送截图
{

MemoryStream ms = new MemoryStream();
g.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.PrimaryScreen.Bounds.Size);//获取屏幕截图
Image mm = SaveJpg(bt,10);//设置图片清晰度
mm = GetWebImage(mm,360,240);//改变截屏图片大小
mm.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

byte[] buffer = new byte[1024];
ms.Position = 0;

int end = 1;
while (end != 0)
{
end= ms.Read(buffer, 0, 1024);//end为零表示读取完毕
c.Send(buffer, buffer.Length, 0);//每次发送1024个字节
}
string sendStr = "over!";//结束信息
byte[] bs = Encoding.ASCII.GetBytes(sendStr);
c.Send(bs, bs.Length, 0);//发送测试信息
ms.Dispose();
}
c.Close();  
Console.ReadLine();
}
public static Socket connect(int port, string host)
{
IPAddress ip = IPAddress.Parse(host);
IPEndPoint ipe = new IPEndPoint(ip, port);//把ip和端口转化为IPEndPoint实例 
Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket    
Console.WriteLine("Conneting...");
try
{

c.Connect(ipe);//连接到服务器 
return c;
}
catch
{
Thread.Sleep(1000);
connect(port, host);
return c;

}

}
public static Image SaveJpg(Image image, long value)//设置图像质量1—100
{
ImageCodecInfo icInfo = null;
ImageCodecInfo[] infos = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo info in infos)
{
if (info.MimeType == "image/jpeg")
{
icInfo = info;
break;
}
}
EncoderParameters ep = new EncoderParameters(2);
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, value);//质量，定义图片的清晰度
ep.Param[1] = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionLZW);//压缩，似乎无效果
return image;
}
public static Image GetWebImage(Image img, int p_Width, int p_Height)//改变图片大小
{
Bitmap _Bitmap = new Bitmap(p_Width, p_Height);
Graphics _Graphcis = Graphics.FromImage(_Bitmap);
_Graphcis.DrawImage(img, 0, 0, p_Width, p_Height);
_Graphcis.Dispose();
return _Bitmap;
}

}
}