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Ah, ok. Thanks Tomasz.
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> Hello,
>
> Sorry, but file positions are 64 bit integers therefore can't be held in regular nor static variables (floating point).
> Instead you may create new file name after storing given number of records (say 20000).
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "Julian" <juliangoodsell@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Friday, July 10, 2009 11:12 AM
> Subject: [amibroker] fseek
>
>
> > Tomasz, is there any chance of implementing this for read only mode?
> >
> > I found a post from two years ago discussing it with the "r+" file mode but you mentioned there were various problems to overcome
> > in actually using it in "r+" mode.
> >
> > This has to do with my previous request for logging time and sales. These files could reach 100k+ records and at the moment in AB,
> > you can't skip lines. I.e. If you want to process from line 90,000, you have to fgets() 90k times just to get there which takes
> > around 300ms on my 3.2ghz.
> >
> > An fseek function would allow progressive reading of large files. E.g.
> >
> > lastPosition = StaticVarGet("LastPosition");
> > fh = fopen("log.txt");
> > fseek(fh, lastPosition);
> > while (!feof(fh)){
> > ..// fgets();
> > }
> > StaticVarSet("LastPosition", fgetpos());
> >
> > This would make the difference between hundreds of milliseconds and a couple of milliseconds.
> >
> > Regards,
> > Julian.
> >
> >
> >
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------------------------------------
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