Paging question

[jambalaya]

Hi. Could someone please tell me at which stage is the total number of pages known?

I configured a PDF exporter to export only page 1 (the second one), and to my surprise the "page 1 of X" field worked correctly. So, how is the page count known, how does this work?

1. the number of pages is somehow known before the actual PDF document generation is done, but I fail to see how this can be

or

2. the whole document is created (3 pages in this case), and then only the bytes for page 1 are written to the stream I supplied, plues all necessary PDF headers and trailers

or

3. some other ingenious way I cannot see now

Which one is the case?

 

Best regards.

[Teodor Danciu]

Hi,

 

JR works like in #2.

When you fill a report template with data, you get a JasperPrint object, which is a complete document in JR's proprietary format. Then this document can be exporter to PDF or other formats. Or, you can export pieces of it. Like the second page.

 

I hope this helps.
Teodor

 

[jambalaya]

Thank you for the explanation.

Cheers.