Create a server socket from an existing client socket
Hi. I'm using a TTcpClient component to connect to a server (i know the component is deprecated...) The delphi (windows 32 vcl) application is a client socket (connected to an as400 server socket) I need to create a second socket in the delphi application that is a server socket (to implement the drawback design pattern) So i need to create a new connection between the same job on the as400 and the same process in the delphi application, but reversed. (the windows application is this time the server) I can't use the ip adress of the windows desktop to initiate the connection from the as400, because the application on the windows desktop can run on a tse architecture. Is it possible to use the first connection to create the new one ?
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duval
12/31/2013 2:03:02 PM
embarcadero.delphi.win32
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duval wrote: > So i need to create a new connection between the same job on the as400 > and the same process in the delphi application, but reversed. (the > windows application is this time the server) The as400 needs to create a new client socket and connect it to your new server socket. > Is it possible to use the first connection to create the new one ? No, it is not. That is not how TCP/IP or sockets are designed to work. Each connection is unique and independant from other connections. Are you SURE you actually need a server socket? What is the actual requirement that the "drawback design pattern" needs? -- Remy Lebeau (TeamB)
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Remy
12/31/2013 4:55:05 PM
hi. Sorry i meant "callback design pattern"
I want to make a "push server" instead of a "pull client".
Sometimes i want the server to be able to trigger an event on the client.(when a long thread is done for example)
Another solution than a socket could suit me but i thought i could reuse the first one .
I know i will have to create a new socket from the as400, and i know the ip adress of the client that is gonna become a server, but what if the client runs on a tse ? Don't they all seen from the same ip adress ?
> {quote:title=Remy Lebeau (TeamB) wrote:}{quote}
> duval wrote:
>
> > So i need to create a new connection between the same job on the as400
> > and the same process in the delphi application, but reversed. (the
> > windows application is this time the server)
>
> The as400 needs to create a new client socket and connect it to your new
> server socket.
>
> > Is it possible to use the first connection to create the new one ?
>
> No, it is not. That is not how TCP/IP or sockets are designed to work.
> Each connection is unique and independant from other connections. Are you
> SURE you actually need a server socket? What is the actual requirement that
> the "drawback design pattern" needs?
>
> --
> Remy Lebeau (TeamB)
Edited by: duval arnaud on Dec 31, 2013 2:07 PM
Edited by: duval arnaud on Dec 31, 2013 2:09 PM
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duval
12/31/2013 10:11:42 PM
duval wrote: > I want to make a "push server" instead of a "pull client". TCP is bidirectional. Once a socket connection has been established, data can flow in both directions at any time. You do not need to open a server socket in order to receive pushed data. A client socket can connect to a server socket and then the server app can push data to the client app. -- Remy Lebeau (TeamB)
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Remy
1/1/2014 5:32:58 PM
ok thanks.
> {quote:title=Remy Lebeau (TeamB) wrote:}{quote}
> duval wrote:
>
> > I want to make a "push server" instead of a "pull client".
>
> TCP is bidirectional. Once a socket connection has been established, data
> can flow in both directions at any time. You do not need to open a server
> socket in order to receive pushed data. A client socket can connect to a
> server socket and then the server app can push data to the client app.
>
> --
> Remy Lebeau (TeamB)
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duval
1/3/2014 9:53:50 AM
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