在上篇裡介紹了Socket的基本編程,這次來看看.net封裝的基於TCP協議的發送和接收端
TCP協議的接收端
using System.Net.Sockets ; //使用到TcpListen類
using System.Threading ; //使用到線程
using System.IO ; //使用到StreamReader類
int port = 8000; //定義偵聽端口號
private Thread thThreadRead; //創建線程，用以偵聽端口號，接收信息
private TcpListener tlTcpListen; //偵聽端口號
private bool blistener = true; //設定標示位，判斷偵聽狀態
private NetworkStream nsStream; //創建接收的基本數據流
private StreamReader srRead;
private System.Windows.Forms.StatusBar statusBar1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.ListBox listBox1; //從網絡基礎數據流中讀取數據
private TcpClient tcClient ;
private void Listen ( )
{
try
{
tlTcpListen = new TcpListener ( port ) ; //以8000端口號來初始化TcpListener實例
tlTcpListen.Start ( ) ; //開始監聽
statusBar1.Text = "正在監聽..." ;
tcClient = tlTcpListen.AcceptTcpClient ( ) ; //通過TCP連接請求
nsStream = tcClient.GetStream ( ) ; //獲取用以發送、接收數據的網絡基礎數據流
srRead=new StreamReader(nsStream);//以得到的網絡基礎數據流來初始化StreamReader實例
statusBar1.Text = "已經連接！";
while( blistener ) //循環偵聽
{
string sMessage = srRead.ReadLine();//從網絡基礎數據流中讀取一行數據
if ( sMessage == "STOP" ) //判斷是否為斷開TCP連接控制碼
{
tlTcpListen.Stop(); //關閉偵聽
nsStream.Close(); //釋放資源
srRead.Close();
statusBar1.Text = "連接已經關閉！" ;
thThreadRead.Abort(); //中止線程
return;
}
string sTime = DateTime.Now.ToShortTimeString ( ) ; //獲取接收數據時的時間
listBox1.Items.Add ( sTime + " " + sMessage ) ;
}
}
catch ( System.Security.SecurityException )
{
MessageBox.Show ( "偵聽失敗！" , "錯誤" ) ;
}
}
//開始監聽
private void button1_Click(object sender, System.EventArgs e)
{
thThreadRead = new Thread ( new ThreadStart ( Listen ) );
thThreadRead.Start();//啟動線程
button1.Enabled=false;
}
// 清理所有正在使用的資源。
protected override void Dispose( bool disposing )
{
try
{
tlTcpListen.Stop(); //關閉偵聽
nsStream.Close();
srRead.Close();//釋放資源
thThreadRead.Abort();//中止線程
}
catch{}
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
TCP協議的發送端
using System.Net.Sockets; //使用到TcpListen類
using System.Threading; //使用到線程
using System.IO; //使用到StreamWriter類
using System.Net; //使用IPAddress類、IPHostEntry類等
private StreamWriter swWriter; //用以向網絡基礎數據流傳送數據
private NetworkStream nsStream; //創建發送數據的網絡基礎數據流
private TcpClient tcpClient;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.StatusBar statusBar1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2; //通過它實現向遠程主機提出TCP連接申請
private bool tcpConnect = false; //定義標識符，用以表示TCP連接是否建立
//連接
private void button1_Click(object sender, System.EventArgs e)
{
IPAddress ipRemote ;
try
{
ipRemote = IPAddress.Parse ( textBox1.Text ) ;
}
catch //判斷給定的IP地址的合法性
{
MessageBox.Show ( "輸入的IP地址不合法！" , "錯誤提示！" ) ;
return ;
}
IPHostEntry ipHost ;
try
{
ipHost = Dns.Resolve ( textBox1.Text ) ;
}
catch //判斷IP地址對應主機是否在線
{
MessageBox.Show ("遠程主機不在線！" , "錯誤提示！" ) ;
return ;
}
string sHostName = ipHost.HostName ;
try
{
TcpClient tcpClient = new TcpClient(sHostName,8000);//對遠程主機的8000端口提出TCP連接申請
nsStream = tcpClient.GetStream();//通過申請，並獲取傳送數據的網絡基礎數據流
swWriter = new StreamWriter(nsStream);//使用獲取的網絡基礎數據流來初始化StreamWriter實例
button1.Enabled = false ;
button2.Enabled = true ;
tcpConnect = true ;
statusBar1.Text = "已經連接！" ;
}
catch
{
MessageBox.Show ( "無法和遠程主機8000端口建立連接！" , "錯誤提示！" ) ;
return ;
}
}
//發送
private void button2_Click(object sender, System.EventArgs e)
{
if (textBox2.Text !="")
{
swWriter.WriteLine(textBox2.Text);//刷新當前數據流中的數據
swWriter.Flush();
}
else
{
MessageBox.Show("發送信息不能為空！","錯誤提示！");
}
}
// 清理所有正在使用的資源。
protected override void Dispose( bool disposing )
{
if ( tcpConnect )
{
swWriter.WriteLine ( "STOP" ) ; //發送控制碼
swWriter.Flush (); //刷新當前數據流中的數據
nsStream.Close (); //清除資源
swWriter.Close ();
}
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
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