Simple idtcp Indy 10 example in Delphi 2009

Posted on 2008-10-27
Last Modified: 2013-11-23
Hi experts,

I´m trying to learn the idtcp indy components, i searched a little but all examples that i found i could´t run in my system, that is delphi 2009 with indy 10.

I want a simple example to transmit and read a simple string, no commands,no files, no nothing, i want just a start. The example must be like drop an edit and a idtcp then do this, then do that, step by step will be much apreciated.

Thank you very much.

Question by:arreegua
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Expert Comment

ID: 22812855

Author Comment

ID: 22813110
"I want a simple example to transmit and read a simple string, no commands,no files, no nothing, i want just a start. The example must be like drop an edit and a idtcp then do this, then do that, step by step will be much apreciated."

Sorry i need a simple example, don´t want anything with ssl.
LVL 28

Assisted Solution

2266180 earned 100 total points
ID: 22816007
[Live Webinar] The Cloud Skills Gap

As Cloud technologies come of age, business leaders grapple with the impact it has on their team's skills and the gap associated with the use of a cloud platform.

Join experts from 451 Research and Concerto Cloud Services on July 27th where we will examine fact and fiction.


Accepted Solution

dprochownik earned 400 total points
ID: 22817160
If you want to run samples you have found before I advice you an article about upgreading from Indy9 to 10:
In fact, in most cases there are only few simple steps to make this code working.

If you want direct sample, here you have one.
Create two Delphi projects, one for server and one for client.


On server main form put only TidTCPServer component and change its properties:
  • DefaultPort = 3080 (for example)
  • Active = true (Server will be active since application start)
For TidTCPServer handle event OnExecute as:

  vClientMessage: String;
    //Getting message from client
    vClientMessage := AContext.Connection.IOHandler.WaitFor(#13);

    self.Caption := vClientMessage; //Or do with that string whatever you want to

    //Sending response
    AContext.Connection.IOHandler.WriteLn('Server response');
    //Closing connection
    if AContext.Connection.Connected then


On client main form put TidTCPClient and TBitBtn components.
For TidTCPClient component change properties
  • Port = 3080 (it have to be the same port as in server application)
  • Host = '' (it is computer you want connect to. is equal localhost, and means your own computer)
handle TBitBtn.OnClick event as:

    IdTCPClient1.IOHandler.WriteLn('Client message');
    Self.Caption := IdTCPClient1.IOHandler.ReadLn;

Now when you run both of them, and click on Client App on the button, then Client will send to server message 'Client message'. Server will show it in its form caption, and response to client string 'Server response' which Client will show in its form caption.

I hope it's clear enough.


Author Comment

ID: 22824339
Thank you Very Much Ciuly and dprochownik.

The example that ciuly send me was exactly what i want but with a few errors to run with  delphi 2009 and indy 10(something with maxlines and lack of iohandler.writeLn) but it was ok, and i did the minor fixes to run following the dprochownik link to update from indy 9 to indy 10. Thank you very much Ciuly.

I ll Split points to reward the Ciuly efort but dprochownik answer was very complete, if i could i would give 500 point to every body.

Thank you very much both of you, when i grow up i want to be like u two , kakakak

cya guys thankyou again

Author Closing Comment

ID: 31510298
Thankyou guys, exactly what i want

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Here is a helpful source code for C++ Builder programmers that allows you to manage and manipulate HTML content from C++ code, while also handling HTML events like onclick, onmouseover, ... Some objects defined and used in this source include: …
How to install Selenium IDE and loops for quick automated testing. Get Selenium IDE from Go to that link and select download selenium in the right hand column That will then direct you to their download page. From that p…
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
The viewer will learn how to use NetBeans IDE 8.0 for Windows to connect to a MySQL database. Open Services Panel: Create a new connection using New Connection Wizard: Create a test database called eetutorial: Create a new test tabel called ee…
Suggested Courses
Course of the Month8 days, 5 hours left to enroll

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question