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Thanks Tomasz,
all good now. Yeah from the performance of CTRL+C it's not too difficult to tell it's not using LVM_GETITEMTEXT. :) Your copy routine is blisteringly quick.
All I do now is send the following key messages:
1. CTRL+C - to Time and Sales List control.
2. CTRL+A, CTRL+V, CTRL+S - to timeandsales.log document open in TextPad.
Then I just read the timeandsales.log file back in through the plugin for access in AB. Roundabout way but is plenty fast enough for realtime access.
Regards,
Julian.
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> Ctrl+C from Time&Sales does not use LVM_GETITEMTEXT at all.
> This list is owner data and has its own direct buffer that is 2 orders of magnitude faster than windows messages.
> That is internal AB structure not exposed by any API.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "Julian" <juliangoodsell@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Friday, July 17, 2009 4:54 PM
> Subject: [amibroker] ADK SendMessage
>
>
> > I'm working on my first AFL plugin using Dev-C++. I'm a programmer by trade, but not a Windows programmer.
> >
> > Anyway, after three days of brutal toil, I've managed to access the Time & Sales window. However to read the contents, I'm using
> > the SendMessage LVM_GETITEMTEXT function which is really slow. I don't fully understand the windows messaging system yet, so don't
> > get where the performance issue is. Something to do with them being queued?
> >
> > 40,000 SendMessage requests takes around 1.6 seconds which is way slow and that's only for 1 column of data. I can read and
> > process 4 columns of the same data from a text file in around 50ms.
> >
> > For realtime, where you'd only be reading maybe 500 records at a time, there's 4000 SendMessage calls and even that takes 100ms.
> > As I don't understand Windows very well, is there a faster way of doing this? Can I get a reference to the actual class itself?
> >
> > When I copy (CTRL+C) from the Time & Sales window, it's so quick it's barely noticeable on the cpu graph. It'd be quicker for me
> > to send a CTRL+C key message to the window and then process the data from the clipboard, which is a viable option if there's
> > nothing else.
> >
> > Hopefully there's some Windows programmers around here.
> >
> > Thanks,
> > Julian.
> >
> >
> >
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