How close socket ???

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hi ,
there is problem :
im writing this code in form close event

C#

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    client.Shutdown(SocketShutdown.Both);//error :Object reference not sent to an instance of an object 
    client.Close();
}

when both programs (send and recieve program )are connected , there is no problem
but when i open server program and , close it before connect it to client program , this error shown , what i most to do to remove it ?
ok client program :

C#

private void Form1_Load(object sender, EventArgs e)
{
    IPAddress host = IPAddress.Parse("192.168.0.100");
    hostep = new IPEndPoint(host, 8001);
    sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    try
    {
        sock.Connect(hostep);
        timer1.Enabled = true;
    }
    catch (Exception a)
    {
        label1.Text = a.Message;
    }
}

this is block that accept socket from server .

Posted 30-Mar-10 4:38am

bany39

Updated 30-Mar-10 5:19am

Kristian Sixhøj

v3

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3 solutions

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Luc Pattyn · Accepted Answer · 2010-03-30T18:31:00

Solution 3

Unless there are related errors in code not shown, you could easily solve it like this:

C#

private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
    if (client!=null) {
        client.Shutdown(SocketShutdown.Both);// no NullRefExc
        client.Close();
    }
}

:)

Posted 30-Mar-10 18:31pm

Luc Pattyn

OriginalGriff · Accepted Answer · 2010-03-30T04:48:00

Solution 1

Since the error is "Object reference not set to an instance of an object" the most likely culprit is that "client" is null. Since we can't see where you load this, I would check that.

Posted 30-Mar-10 4:48am

OriginalGriff

Nicholas Butler · Accepted Answer · 2010-03-30T05:40:00

Solution 2

You are using a variable called sock in your Load handler, but one called client in your FormClosing handler. Are these two code snippets from the same program?

If you don't set client to a Socket instance, then it will be null and cause the exception you are seeing.

Nick

Posted 30-Mar-10 5:40am

Nicholas Butler