Visual Basic, Need help writing FTP client in VB

Brian Smi
#1 / 8

Need help writing FTP client in VB

Hi all,
I'm writing (or rather, trying to write) a simple ftp client using the Dolphin
Systems socket control. Firstly, is this the right tool to be using ?

I've managed to connect to the remote host ok, but synchronizing the dialogue
between my client and the ftp server is proving troublesome. What messages
should I be waiting for FROM the server to tell the client that its OK to send
the next message ? After the connection is made I send "USER <name>" and I'm
waiting for a "331 Password required" message, but it never comes.

I've got one control on the form...should I be using two, perhaps ? One for
sending, one for receiving ?

All advice gratefully accepted - e-mail preferred :)

"Lost in C-Space"

Tue, 19 May 1998 03:00:00 GMT

Tiboldi Kalma
#2 / 8

Need help writing FTP client in VB

Quote:

>Hi all,
>I'm writing (or rather, trying to write) a simple ftp client using the Dolphin
>Systems socket control. Firstly, is this the right tool to be using ?

I have been using a shareware DLL ftp4w.dll and it works well.
I found this DLL in ftp4w12.zip . I have included it in my application.
If you don't have it, let me know and I will send You.
Tibi.

* Tiboldi Kalman * TVH Forklift Parts * Tel: +3256434295 *

* URL : www.tvh.be * 8560 Gullegem , Belgium *

Tue, 19 May 1998 03:00:00 GMT

Tiboldi Kalma
#3 / 8

Need help writing FTP client in VB

Quote:

>Hi all,
>I'm writing (or rather, trying to write) a simple ftp client using the Dolphin
>Systems socket control. Firstly, is this the right tool to be using ?

I have been using a shareware DLL ftp4w.dll and it works well.
I found this DLL in ftp4w12.zip . I have included it in my application.
If you don't have it, let me know and I will send You.
Tibi.

* Tiboldi Kalman * TVH Forklift Parts * Tel: +3256434295 *

* URL : www.tvh.be * 8560 Gullegem , Belgium *

Tue, 19 May 1998 03:00:00 GMT

Tim Pearso
#4 / 8

Need help writing FTP client in VB

Your sorta reinventing the wheel, there are several ftp controls already available from Distinct,
defSoft, etc.

--
Tim Pearson

http://www.starwave.com

Tue, 19 May 1998 03:00:00 GMT

Peter Wrigh
#5 / 8

Need help writing FTP client in VB

Quote:

> I'm writing (or rather, trying to write) a simple ftp client using the Dolphin
> Systems socket control. Firstly, is this the right tool to be using ?

What you are trying to achieve can be got at much easier using Netscape. Netscape
has OLE automation facilities built in which you can use very easily to create
a simple FTP client. Check out their home page for links which lead to their
developer resources, in particular the piece on OLE automation and Netscape.

You need to find out about the Network.1 object and the methods and properties
it provides.

If you get nowhere let me know and I will forward some source code for you
to check out.

Peter

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Tue, 19 May 1998 03:00:00 GMT

Stephen Cra
#6 / 8

Need help writing FTP client in VB

Quote:

>Hi all,
>I'm writing (or rather, trying to write) a simple ftp client using the Dolphin
>Systems socket control. Firstly, is this the right tool to be using ?
>I've managed to connect to the remote host ok, but synchronizing the dialogue
>between my client and the ftp server is proving troublesome. What messages
>should I be waiting for FROM the server to tell the client that its OK to send
>the next message ? After the connection is made I send "USER <name>" and I'm
>waiting for a "331 Password required" message, but it never comes.
>I've got one control on the form...should I be using two, perhaps ? One for
>sending, one for receiving ?
>All advice gratefully accepted - e-mail preferred :)
>"Lost in C-Space"

The licensed release of dsSocket includes sample VB source for an FTP
client. You need to have one control to handle the coomand channel on
port 21, one to listen for the return connection and one to handle the
actual data transfer.

Make sure that you are adding the CRLF to the end of the command you
send the server.

Steve

--------------------------------------------------
Stephen Cramp Developers of dsSocket
Dolphin Systems Inc. TCP/IP custom control

Demo on www.dolphinsys.com
--------------------------------------------------

Tue, 19 May 1998 03:00:00 GMT

Paul Brig
#7 / 8

Need help writing FTP client in VB

Quote:

>Hi all,
>I'm writing (or rather, trying to write) a simple ftp client using the Dolphin
>Systems socket control. Firstly, is this the right tool to be using ?
>I've managed to connect to the remote host ok, but synchronizing the dialogue
>between my client and the ftp server is proving troublesome. What messages
>should I be waiting for FROM the server to tell the client that its OK to send
>the next message ? After the connection is made I send "USER <name>" and I'm
>waiting for a "331 Password required" message, but it never comes.
>I've got one control on the form...should I be using two, perhaps ? One for
>sending, one for receiving ?
>All advice gratefully accepted - e-mail preferred :)
>"Lost in C-Space"

I have done this using Dolphin's dsSocket and it is used in a
production application on campus. It is a little complicated but
certainly not impossible. You will need a second control if you want
to do a LIST, RETR, or SEND command. You probably will since you are
trying to do FTP. And you will need the PORT command and if your
application won't be aware of the local ip address you will need the
PASV command. There are lots of little quirky things to work through.
Contact me offline if you want to pursue this.

Paul Briggs
University of Guelph
Guelph, Ontario, Canada

Fri, 22 May 1998 03:00:00 GMT

Mark Dixo
#8 / 8

Need help writing FTP client in VB

The book "Internet Programming" by Kris Jamsa and Ken Cope,
available from Jamsa Press (ISBN 1-884133-12-6) contains among
other things sample VB code for an FTP client under Winsock.
The book also gives a lot of excellent background material for
anyone wanting to do Internet programming with Visual Basic.

I have tested the FTP client program presented in the book and
it does work, I think you would find the book helpful.

El Marco

Sun, 24 May 1998 03:00:00 GMT