I know, I'm asking a lot of questions...but as a new delphi developer I keep falling over all these questions :)

This one deals with TCP communication using indy 10. To make communication efficient, I code a client operation request as a single byte (in most scenarios followed by other data bytes of course, but in this case only one single byte). Problem is that

var Bytes : TBytes;
...
SetLength (Bytes, 1);
Bytes [0] := OpCode;
FConnection.IOHandler.Write (Bytes, 1);
ErrorCode := Connection.IOHandler.ReadByte;

does not send that byte immediately (at least the servers execute handler is not invoked). If I change the '1' to a '9' for example everything works fine. I assumed that Indy buffers the outgoing bytes and tried to disable write buffering with

FConnection.IOHandler.WriteBufferClose;

but it did not help. How can I send a single byte and make sure that it is immediatly sent? And - I add another little question here - what is the best way to send an integer using indy? Unfortunately I can't find function like WriteInteger in the IOHandler of TIdTCPServer...and

WriteLn (IntToStr (SomeIntVal))

seems not very efficient to me. Does it make a difference whether I use multiple write commands in a row or pack things together in a byte array and send that once?

Thanks for any answers!

EDIT: I added a hint that I'm using Indy 10 since there seem to be major changes concerning the read and write procedures.