Re: Nice odd tcpip socket question.
- From: Marco van de Voort <marcov@xxxxxxxx>
- Date: Tue, 31 May 2005 13:45:39 +0000 (UTC)
On 2005-05-31, Dodgy <Dodgy@xxxxxxxxxxxxxxxxxxxxx> wrote:
> I'm trying to work with client sockets, done this loads of time
> before, and happily use the Indy 9 components in D5 Ent.
>
> Today I hit a snag... The spec I have to conform to has fixed length
> data packets, with no terminating character.
>
> I tried to use idtcpclient.readln, but I can't give it a termination
> character, and it appears not to return anything until it finds the
> termination character, even after the timeout has exceeded and it's
> returned control to the app.
>
> I really need to be able to say "read x bytes, but give up waiting
> after y seconds", something I though readln would do admirably. Alas
> no. None of the other read methods allow a timeout to be set, and I
> really need to keep this side under control as the eventual deployment
> will be in a thread, and I don't want threads left laying about hung
> because they have a tcpip connection, but for some reason the server
> hasn't sent them the required number of bytes (i.e. the server process
> has gone wrong).
>
> Any ideas?
(untested) Readbuffer is
procedure TIdTCPConnection.ReadBuffer(var ABuffer; const AByteCount: Integer);
begin
if (AByteCount > 0) and (@ABuffer <> nil) then begin
// Read from stack until we have enough data
while (InputBuffer.Size < AByteCount) do begin
ReadFromStack;
CheckForDisconnect(True, True);
end;
// Copy it to the callers buffer
Move(InputBuffer.Memory^, ABuffer, AByteCount);
// Remove used data from buffer
InputBuffer.Remove(AByteCount);
end;
end;
The readfromstack is the one that blocks, but it has default parameters that can adjust this behaviour.
Iow derive from tidtcpconnection, add a "myreadbuffer" with the above code, but WITH timeout parameters for readfromstack.
.
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