[Gambas-user] Strings and Network input ...

[Gareth Bult]

Mmm,

This however does increase the complexity of the application and the amount of work being done in Gambas.
(which I'm guessing *will* slow it down, although to what extent I don't know)

The main aim of the application is to provide a graphical IMAP sync tool .. which will typically load the machine in question right up to the hilt .. so performance will be an issue.

Point is, assuming what you say is right, "LINE INPUT" is unsafe, unless there's an undocumented method of seeing whether the returned string was actually terminated by an and of line sequence .. you can never use LINE INPUT and be sure you actually have a line (!)
..
Gareth.

----- Original Message -----
From: "nando" <nando_f at ...951...>
To: "mailing list for gambas users" <gambas-user at lists.sourceforge.net>
Sent: Wednesday, May 9, 2007 4:54:19 PM (GMT) Europe/London
Subject: Re: [Gambas-user] Strings and Network input ...

I experienced a similar problem where I expected it to read up to a delimiter,
but it turns out that LINE INPUT could read up to the end of the complete buffer
because the whole line wasn't received yet, so it was a partial read...sometimes
requiring two or even three reads.  The data sent through the socket from another
machine may take quite some time, so multiple read attempts will be required.
I used _read for the socket and I appended what was received to a global receive
string.  Then I can find the delimiter at anytime independent of the read process.
I added a 'time-out' timer to expect a delimiter within a certain period of
time..so then the whole thing won't get hung-up because the imap server is too
slow or went off-line(etc).  This gives a huge amount of control.


---------- Original Message -----------
From: Gareth Bult <gareth at ...1689...>
To: Gambas User Mailing List <gambas-user at lists.sourceforge.net>
Sent: Wed, 9 May 2007 14:22:55 +0100 (BST)
Subject: [Gambas-user] Strings and Network input ...

> Hi,
> 
> I'm currently developing an IMAP4 client component and I seem to have run into a 
> problem.
> 
> I'm using _Read on a Socket object when data comes in, then I'm doing;
> 
> $socket.EndOfLine = "\r\n" 
> LINE INPUT #$socket,buffer 
> Process(buffer)
> 
> Now I understand this to mean that Process() will only get called with 
> "complete" lines. 
> i.e. lines that were terminated by a CRLF.
> 
> If I issue a SEARCH command against my IMAP server, I get a variable length 
> string, and for a large folder I'm expecting a string of length 41140 to come 
> through. However (!) Process is being called TWICE, the first time with a string 
> of length 41116 and the second of 24.
> 
> So it "looks like" LINE INPUT is running out of buffer space and silently 
> splitting the string in two ... (????)
> 
> I'd rather not have to code CRLF detection for READ .. is this a bug, something 
> fixable, or am I missing something ?
> 
> tia 
> Gareth.
> 
> -- 
> Gareth Bult, Encryptec Limited 
> Tel: 0845 25 77033, FWD: 753977, Mob: 07891 389657 
> Email: gareth at ...1689...
> 
> Statements made are at all times subject to Encryptec's Terms and Conditions of 
> Business, which are available upon request. 
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Gareth Bult, Encryptec Limited
Tel: 0845 25 77033, FWD: 753977, Mob: 07891 389657
Email: gareth at ...1689...

Statements made are at all times subject to Encryptec's Terms and Conditions of Business, which are available upon request.