When I investigated this single socket connection some years ago I just used
a standard Delphi client socket with the standard FTP commands. It is now
easier to use the multiple FTP clients to solve my problem. I am currently
at a convention and spoke to the server vendor and he agreed this idea was a
good solution.
The first attempt seems to have a problem (problem something stupid I'm
doing). I have 2 FTP clients and created 2 memory streams. If both FTP
clients connect and then disconnect, when I free the second memory stream I
get an error. If only one FTP client connects and disconnects, I can free
both memory streams.
Obviously doing something dim.
Graham
-Original Message-
From: twsocket-boun...@elists.org [mailto:twsocket-boun...@elists.org] On
Behalf Of Angus Robertson - Magenta Systems Ltd
Sent: 14 April 2010 07:32
To: twsocket@elists.org
Subject: Re: [twsocket] Multiple FTP Clients
I am attempting to transfer and process a lot of files via a memory
stream. Conventional FTP seems to take about 200mS per transfer.
Possibly due to the opening and closing of the data socket for each
transfer.
This speed is as expected, the port for each data socket has to be
negotiated, then the TCP stream opened.
The same speed issue occurs listing files in multiple directories, it can
take several minutes to parse a complex directory structure one at a time.
It's why the ICS FTP client and server have new FTP directory commands,
XCMLSD which lists directories using the control channel, and XDMLSD
which combines multiple directory listings into a single download.
Do you have a specification for this UNIX server that sends data files on
the control connection, or a command log?
Angus
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