[RESOLVED] Getting 'Address In Use' Run-time Error, Now!!

[ThEiMp]

When I try to run my code through "Command10", on the Form. I get a run-time error and the code is: '10048' and the description of it, is 'Address In Use'. That is crashing the program as well.

Can someone help me.

[jmsrickland]

The error is caused because you are trying to address a socket that is currently in use either by your application or some other application.

Example of another application

A program is running with a socket connected to some URL on let's say port 555 and you start up another program that tries to connect to even a different URL but the port number is also 555.

Ummm, wonder why it isn't called 'Port Number In Use'

Also, even if you close your application but you did not close your socket and you try to use that same socket address again you will get this error

[Siddharth Rout]

Straight from MSDN: Typically, only one usage of each socket address (protocol/IP address/port) is permitted. This error occurs if an application attempts to bind a socket to an IP address/port that has already been used for an existing socket, or a socket that was not closed properly, or one that is still in the process of closing. For server applications that need to bind multiple sockets to the same port number, consider using setsockopt (SO_REUSEADDR). Client applications usually need not call bind at all—connect chooses an unused port automatically. When bind is called with a wildcard address (involving ADDR_ANY), a WSAEADDRINUSE error could be delayed until the specific address is committed. This could happen with a call to another function later, including connect, listen, WSAConnect, or WSAJoinLeaf.

[ThEiMp]

So how do I close a socket, that was being used by my project?

[jmsrickland]

Winsock1.Close

You should close your socket in your Winsock1_Close event and/or when you Exit out of your application

Basiclly you should have

1) Command button for manualy closing of socket
2) Winsock_Close event in case other side disconnects from you
3) Form_Unload event when you shut down your application

To avoid run-time error use an If...Then clause

If Winsock1.State = sckConnect(ed) Then Winsock1.Close