How do I programatically create Indy components

Posted on 2009-04-08
Last Modified: 2012-05-06
Hi experts, I am trying to create a service and creating the indy components (tcpserver, udpserver) from code rather than dropping a component on a form.  I'm looking for some code sample that shows how to do this.

Question by:viziopoint
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LVL 13

Assisted Solution

ThievingSix earned 25 total points
ID: 24104193

procedure Button1Click(Sender: TObject);
  IRC : TidIRC;
  IRC := TidIRC.Create(...);
  blah blah

Remember to include the correct units associated with the component in your uses for it to work.
LVL 37

Accepted Solution

Geert Gruwez earned 100 total points
ID: 24104567
GExperts has a very nice feature for this
after installing it into the Delphi IDE, do this:
put a component on your form as you normally do
then right click on the component
(gexperts will have added extra menu options)
Components to Code

This creates a variable, the component creation with the constructor and the properties

I got this, from 3 clicks and a Ctrl-V to paste:

  IdTCPClient1: TIdTCPClient;

  IdTCPClient1 := TIdTCPClient.Create(Self);
  with IdTCPClient1 do
    Name := 'IdTCPClient1';
    MaxLineAction := maException;
    ReadTimeout := 0;
    Port := 0;

LVL 13

Expert Comment

ID: 24104986
Hey, that's really useful!

Thanks Geert_Gruwez =D
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Author Comment

ID: 24113562
The GeExpert tip is indeed a very really useful tip! - Thanks!

I'm getting some odd results though like:

Bindings := <>;
It tried to replace the <> with nil - compiles but does not work (crashes) so I just commented them out and it seems to work.

I also had problems with assigning event handlers since I don't have a form.  I was able to fix this with a little trick that I think is fine:

   TEventHandlers = class // create a dummy class
       procedure UDPServerUDPRead(Sender: TObject; AData: TStream; ABinding: TIdSocketHandle);
   EvHandlers : TEventHandlers;
IdUDPSever1.OnUDPRead := EvHandlers.UDPServerUDPRead

to the component created with the GeExpert code and it seems to work.

I'll continue to test and report back.

Thanks again for the help.
LVL 37

Expert Comment

by:Geert Gruwez
ID: 24113885
you don't have a form and you want to use an event handler ?

the way you do it with the dummy class is actually the solution!

why you may ask ... well because how the event handler is defined
a event handler is a method, and a method is a procedure of a object

TNotifyEvent = procedure (Sender: TObject) of object;

the *of object* at the end means it must be defined inside a class.

you will have to create a instance of EvHandlers at runtime too...

LVL 13

Expert Comment

ID: 24113977
Actually you should have the indy component in the event handler dummy class.

Author Comment

ID: 24154860
Just wanted to confirm that following the tips above, everything worked fine.  Thanks Again!

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