Sending/receiving data to a TCP/IP port on localhost
lazarus / 38-Networking and Web Programming

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mikea105 · 2016-02-12 04:48

I'm a total noob at communications programming, and now I need to talk
to a server on a port on the local computer.

I've looked at the tools such as Synapse, Ararat Synapse and so
forth.  Unfortunately, even looking at the wiki for Synapse, I can't
figure out where to start.  I see sample code, but it's using SMTP or
HTTP.  What I need to do is send and receive binary data to a server
(it's an AGWPE server, if that helps) on a particular port on the same
computer.  The server is well documented, but I have absolutely no
idea how to actually get the data to/from the port.

Does anyone out there have any sample code or can point me at some
code where this sort of thing is done so I can at least get started? 
Also, if you have any suggestions as how to format the binary data,
that would be helpful. 

Thanks in advance to anyone who can help!

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Thaddy · 2016-02-12 06:58

Well the protocols you mention are actually on top of TCP/IP, so for
example this code should work:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i program
socksend;{$IFDEF FPC}{$MODE DELPHI}{$ENDIF}{$APPTYPE CONSOLE}uses 
SynaFpc,SynSock,BlckSock;var  Sock:TBlockSocket;begin  Sock :=
TBlockSocket.Create;  try    Sock.Connect('LOCALHOST','8080');   
Sock.SendString('Testme!');// You want to use SendStream or
SendStreamRaw for binary.  finally    Writeln(Sock.GetErrorDescEx);  
Sock.Free;  end;  Readln;end. 
The receive side is similar in that you would use BlockSocket directly
instead of one of the higher protocols.

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mikea105 · 2016-02-16 20:47

Thank you very much!  Your answer makes perfect sense.  Now I see what
I was doing wrong.  Now I can get that working!