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
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


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: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

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

Suggested Solutions

Title # Comments Views Activity
FMX and jaudiotracker playing memory stream 29 108
PHP preg_replace code convert to Delphi 14 98
Multi-layered image in FireMonkey 9 93
Twebbrowser add css to the header 3 53
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
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 perform CRUD operations on a MySql database.

751 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