socket program get hangs C#

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my c# program get hang when it run . Can any one please tell me why

C#

private void button1_Click(object sender, EventArgs e)
        {
           
            sck = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse("192.168.0.177"), 80);
            textBox2.Text = localEndPoint.ToString();
            try
            {
                sck.Connect(localEndPoint);
                byte[] bytes = new byte[25];
                 sck.Receive(bytes);//got hang here

               string myString = System.Text.Encoding.UTF8.GetString(bytes);

                
               textBox1.Text = myString+" a";
                sck.Close();
            }
            catch
            {
                Console.Write("Unable to Connect \r\n");
                textBox1.Text = "error";
            }
            
           
        }

Posted 23-Nov-15 20:42pm

Savad.k.s

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2 solutions

Solution 2

You have to set the TimeOut properties for the socket connection because if you don't set a timeout the sockect keep waiting until data arrives and hangs your program execution.

The possible solution is using Async method.
Asynchronous Client Socket Connection[^]
GitHub Demo Project using Asynchronous Socket Client[^]

Posted 23-Nov-15 21:06pm

PANKAJMAURYA

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CPallini · Accepted Answer · 2015-11-23T20:51:00

Solution 1

It hangs because receive is a blocking call: if there is no data to receive then it waits. This is the reason why it is usually invoked in a separate thread.

[update]
Have a look at "Asynchronous Client Socket Example" at MSDN[^].
[/update]

Posted 23-Nov-15 20:51pm

CPallini

Updated 23-Nov-15 21:33pm

v2

Comments

Savad.k.s 24-Nov-15 3:02am

but i have a console application for this. its working fine and the out put is "ffffffff30" somthing like that
=======
console application sourcecode
======

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

//client

namespace ConsoleApplication9
{
class Program
{
static Socket sck;
static void Main(string[] args)
{
sck = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse(&quot;192.168.0.177&quot;), 80);

try
{
sck.Connect(localEndPoint);
}
catch
{
Console.Write(&quot;Unable to Connect \r\n&quot;);
Main(args);
}
Console.Write(&quot;Enter Text: &quot;);
string text=Console.ReadLine();
byte[] data = Encoding.ASCII.GetBytes(text);

sck.Send(data);
Console.Write(&quot;Data Sent!\r\n&quot;);
Console.Write(&quot;Press any key to Continue...&quot;);
string l;

Console.Read();

byte[] bytes = new byte[15];

sck.Receive(bytes);
Console.WriteLine(Encoding.UTF8.GetString(bytes));

sck.Close();
Console.Read();

}

}
}