Sorry about lack of information...
Making some tests, I identified there's no problem with bandwidth limitation
code for normal connections, only with SSL connections.
This is a exemple source code made in Delphi, coded at a button's click
event. You can use the e-mail information unmodified, because it's valid and
I send a large mail to it for test purposes. Please do not modify pop3.Top
to pop3.Retr, because this will make the first message to be unavailable
after a sucessful retrieve (gmail implements this as default and cannot be
changed). And TOP command, even if it drop all message data, do not turn the
message unavailable for download in the next pop3 session you start.
I already tested with pop3.retr, but results are the same.
procedure TForm1.Button1Click(Sender: TObject);
var pop3:TPOP3Send;
begin
pop3:=TPOP3Send.Create;
pop3.Sock.MaxBandwidth:=4096;
pop3.TargetHost:='pop.gmail.com';
pop3.TargetPort:='995';
pop3.Username:='synapsetest';
pop3.Password:='456789a';
pop3.FullSSL:=true;
pop3.AuthType:=POP3AuthAll;
if pop3.Login then begin
pop3.Top(1,26214400);
end;
pop3.Logout;
pop3.Free;
end;
I use ssl_openssl.pas unit and the respective dlls. Only when I use a SSL
connection (pop3.FullSSL = true) the bandwidth limit isn't working. I tested
in a server with normal connections and bandwidth limit works well (but I
note what Lukas mentioned about read all packet data without limitation, and
then limit bandwidth between packets, giving to the download history peaks
when a packet is readed). Anyway, for non-SSL connections bandwidth limit
works fine, only SSL-based pop3 connections are ignoring bandwidth limit.
If you need a program to monitor download/upload history, I suggest to use
NetMeter, a free software which can be downloaded at
http://readerror.gmxhome.de/
I investigate OnStatus hook and no HR_Wait signal is sended at all to this
event in a SSL connection, only when using normal connections. I'm sure the
download speed is above 4 KB/s (as I defined in the example as bandwidth
limit), looking on download history provided by NetMeter (the average speed
was about 70 KB/s).
So, you can confirm that what I said about SSL is true and, in that case,
what is my options to implement bandwidth limit when using SSL connections?
Maykon
----- Original Message -----
From: "Lukas Gebauer" <[EMAIL PROTECTED]>
To: "Ararat Synapse" <[email protected]>
Sent: Tuesday, February 13, 2007 4:11 PM
Subject: Re: [Synalist] Fw: Bandwidth Limit in TPOP3Send class
>> My knowledge in low-level TCP/IP isn't very good, but I don't think all
>> data are sended in one packet in my case. I use the TOP command because a
>> RETRIEVE, in some servers, mark e-mails as read and not list it anymore
>> after a successful retrieve. To avoid this, I send a TOP command with a
>> high line count, so all data are dropped with TOP command. I tested
>> bandwidth limit using a 12 MB message, which I don't think can be send in
>> a single TCP packet, and the bandwidth limit doesn't work at all. So,
>> presuming that my TOP request isn't a single TCP packet operation, how I
>> can implement bandwidth limit (or can be implemented in Synapse classes)?
>
> If you want to see how data is realy readed by socket, use OnStatus hook.
>
> Anyway, I really cannot know where you have a problem. Bandwidth
> limitation code is implemented on very low-level inside synapse, and can
> be used by all sockets inside Synapse. POP3send is not exception.
>
> I can only speculate what is wrong, because you not provide any detailed
> informations. Are you sure if you are setting bandwidth limit correctly?
>
> Use OnStatus hook, see for HR_read and HR_wait events. It is best start
> for debugging.
>
> --
> Lukas Gebauer.
>
> E-mail: [EMAIL PROTECTED]
> WEB: http://www.ararat.cz/synapse - Synapse Delphi and Kylix TCP/IP
> Library
>
>
>
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