> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Slavin, Andrew
> Sent: Wednesday, November 28, 2007 1:40 PM
> To: [email protected]
> Subject: [iText-questions] PdfReader and PdfStamper
>
> hi,
>
> i have two questions about the PdfReader and PdfStamper objects:
>
> 1. why does instantiation of the PdfReader object
> significantly increase
> memory consumption?
>
> e.g. the following two lines of code increase application's memory
> footprint from 10kb to 200kb when <file_path> is the path to
> a 90mb pdf
> file:
>
> FileStream is = new FileStream(<file_path>, FileMode.Open);
> PdfReader reader = new PdfReader(is);
>
byte[] b = new byte[100000000];
Look! With a single line my memory foot print inclease 100M. There's a
lot of thing to keep in PdfStamper and that doesn't come for free.
> 2. when i create a new pdf file from existing one, using PdfStamper
> object, the new file differs from the original one in size:
>
> FileStream is = new FileStream(<original_file_path>,
> FileMode.Open);
> FileStream os = new FileStream(<new_file_path>,
> FileMode.Create);
> PdfReader reader = new PdfReader(is);
> PdfStamper stamper = new PdfStamper(reader, os);
>
> e.g. i have a 45mb pdf file, and if i use it as an original file, the
> new file is only 19mb. visually i cannot see any difference
> between the
> two, but is it safe to say that PdfStamper does not remove
> anything from
> the original file (e.g. attachments)?
For such a reduction I suspect that you have multiple revisions in the
same PDF. iText will only use the latest revision and will keep
everything except tagged data.
Paulo
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