Challenge...

[Alex Tweedly]

Ton Kuypers wrote:

> Hi gang... I need some help...
>
> A user selects a PDF file, I need to know what colors are in this PDF  
> file.
> So far no good, I can read the data and filter out the unwanted lines.
>
> But this becomes a problem when the PDF file is 50 Mb or bigger...
>
> At this point I use:
>
>         put "file:" & vPDFpath into vURL
>         put url vURL into vColors1
>         put url vURL into vColors2
>         filter vColors1 with "*/Separation*"
>         replace "#20" with space in vColors1
>         filter vColors2 with "*/DeviceN*"
>         replace "#20" with space in vColors2
>         replace "]" with "" in vColors2
>         put vColors1 & vColors2 into vColors
>
> This way I get the lines containing the PDF colors, which I filter  
> and use.
> On normal PDF's this happens on the fly, no delay at all...
>
> But one of my clients now sent me a 200 Mb PDF... And you can guess  
> the problem: The file is loaded into memory twice, taking up more  
> then 400 Mb of memory, just to get 3 or 4 lines of data... It's  
> ssssllloooooowwwwwwwwww....
>
> Any ideas on how to do this faster?

Maybe I'm missing something - but would it help to do

        put "file:" & vPDFpath into vURL
        put url vURL into vColors1
        filter vColors1 with "*/Separation*"
        replace "#20" with space in vColors1
        put url vURL into vColors2
        filter vColors2 with "*/DeviceN*"
        replace "#20" with space in vColors2
        replace "]" with "" in vColors2
        put vColors1 & vColors2 into vColors

i.e. all I did was move the         put url vURL into vColors2    down 
until after the filter had been done on vColors1
Reduces the space needed to merely one * 200 Mb.


If that isn't enough - then it depends on whether you need to have a 
full copy of the data in memory for any other purpose or not.



-- 
Alex Tweedly       http://www.tweedly.net



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