Question

My code creates several TidTCPClients and then adds references to them in a TThreadList.

I was hoping to send commands to all of them by then using

for I := 0 to (NumClients - 1) do
begin
  ClientList[I].IOHandler.WriteLn('Whatever');
end;

(that’s obviously only a small part of the code).

However I’m getting two errors:
[DCC Error] Client.pas(261): E2149 Class does not have a default property
[DCC Error] Client.pas(262): E2233 Property ‘IOHandler’ inaccessible here

and after a brief read of This I’m none the wiser about how to do this, but definitely beginning to think that I’m on the wrong track entirely.

Can anyone point me in the right direction?

Answer 1

See doc how to operate TThreadList. You also need to type cast the TidTCPClient objects in the list since it only contains untyped pointers.

var
  list: TList;
...
list := ClientList.LockList;
try
  for I := 0 to list.Count - 1 do
  begin
    TidTCPClient(list[I]).IOHandler.WriteLn('Whatever');
  end;
finally
  ClientList.UnlockList;
end;