https://www.cnblogs.com/yangfengwu/p/11130428.html
Gradually look at the past,,, a lot of knots...
This section is a C# TCP client
I won’t write detailed screenshots of the new project, and read the previous to understand it myself (as long as my article has a serial number, I must look at the front, because the tutorial I wrote is both basic and comprehensive)
Make this page first, connect and disconnect first
Link TCP uses this variable
Actually connect to TCP in just a few sentences
I defined a function because, in fact, it is blocked when connecting, so we need to open a task
The task of C# is to use it like this
OK test now
Since I am using a desktop computer, there is no wireless network card, so I can't connect to the WiFi module...
I use the debugging assistant of this machine to test
start up
Okay now let's use buttons to control connection and disconnection
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;
namespace TCPClient
{
public partial class Form1 : Form
{
private TcpClient myTcpClient = null;// TcpClient
Thread ConnectThread;//连接线程
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void ConnectMethod()
{
myTcpClient = new TcpClient(); //Instantiate myTcpClient
try
{
myTcpClient.Connect("192.168.1.2", 60000);//Connect to the server
//After connecting, execute
Invoke((new Action) (() =>
{
button1.Text = "Disconnect";
})));
}
catch (Exception)
{
//Exception handling function
Invoke((new Action(() =>
{
button1.Text = "Connect";
})));
try {myTcpClient.Close(); }catch {} //Close the connection
}
}
//Connect and disconnect button
private void button1_Click(object sender, EventArgs e)
{
if (button1.Text == "Connect")
{
ConnectThread = new Thread(ConnectMethod);//Create task
ConnectThread.Start();//Start task
}
else
{
try {myTcpClient.Close();} catch {} //Close the connection
Invoke((new Action(()) =>
{
button1.Text = "Connect";
})));
}
}
}
}
test
Then use
First, make a function. At the beginning, the drop-down box of IP displays the IP of the computer. When it is pulled down, the display is refreshed.
/// <Get the local IP address>
///
/// </summary>
/// <returns></returns>
private void getIPAddress()
{
IPAddress[] hostipspool = Dns.GetHostAddresses("");/ /Get this machine so IP
comboBox1.Items.Clear();//Clear the content in the drop-down box
foreach (IPAddress ipa in hostipspool)
{
if (ipa.AddressFamily == AddressFamily.InterNetwork)
{
comboBox1.Items.Add(ipa. ToString());//Add IP data to the drop-down box
comboBox1.SelectedIndex = comboBox1.Items.Count> 0? 0: -1;//Display the first one
}
}
}
Then there is the drop-down event
namespace TCPClient
{
public partial class Form1: Form
{
private TcpClient myTcpClient = null;// TcpClient
Thread ConnectThread;//Connect thread
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
getIPAddress() ;//The function just written. Get the computer IP and display it in the drop-down box
}
/// <Get the local IP address>
///
/// </summary>
/// <returns></returns>
private void getIPAddress()
{
IPAddress[] hostipspool = Dns.GetHostAddresses("");//Get the IP of this machine
comboBox1.Items.Clear();//Clear the contents of the drop-down box
foreach (IPAddress ipa in hostipspool)
{
if (ipa.AddressFamily == AddressFamily.InterNetwork)
{
comboBox1.Items.Add(ipa.ToString());/ /Add the IP data to the drop-down box
comboBox1.SelectedIndex = comboBox1.Items.Count> 0? 0: -1;//Display the first one
}
}
}
private void ConnectMethod()
{
myTcpClient = new TcpClient(); //Instantiate myTcpClient
try
{
myTcpClient.Connect("192.168.1.2", 60000);//Connect to the server
//After connecting, execute
Invoke((new Action() () =>
{
button1.Text = "Disconnect";
})));
}
catch (Exception)
{
//Exception handling function
Invoke((new Action(() =>
{
button1.Text = "Connect";
})));
try {myTcpClient.Close(); }catch {} //Close the connection
}
}
//Connect and disconnect button
private void button1_Click(object sender, EventArgs e)
{
if (button1.Text == "Connect")
{
ConnectThread = new Thread(ConnectMethod);//Create task
ConnectThread.Start ();//Start task
}
else
{
try {myTcpClient.Close();} catch {} //Close the connection
Invoke((new Action(() =>
{
button1.Text = "Connect";
})));
}
}
private void comboBox1_DropDown(object sender, EventArgs e)
{
getIPAddress();//The function just written
}
}
}
test
Okay, make it completely dynamic
test
