Generate & Export PDF/CSV on the fly without holding entire contents in mem

Hello Everyone,
We are using Crystal Reports JRC (in our server side application. In a typical use-case the generated report is exported into the pdf/csv format and streamed to the client/browser.
My question is with regards to the current interface/implementation of the JRC export api(s), which returns an InputStream which is basically a ByteArrayInputStream?, Why ByteArrayInputStream ? why not a custom InputStream imeplementation which really benefits from the streaming approach, and give you the option to stream the contents as they are generated on the fly, instead of it holding the entire report contents in a byte-array, as is the case with using ByteArrayInputStream. Since, this often seems to choke our system with regards to memory footprint, when the generated report contains huge dataset.
Please comment? Is that not possible ? Is there any reason why ByteArrayInputStream is the only way to retrieve the report contents ?
Thanks,
Farhan.
Edited by: mfarhans on Feb 26, 2010 12:40 AM

We have new place called Idea Place, look up on the right hand side. Great place to add enhancement requests.
Or the link: http://www.sdn.sap.com/irj/scn/idea-place

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Generate & Export PDF on the fly without holding entire pdf contents memory

Hello Everyone,
We are using Crystal Reports JRC (in our server side application. In a typical use-case the generated report is exported into the pdf format and streamed to the client/browser.
My question is with regards to the current interface/implementation of the JRC export api(s), which returns an InputStream which is basically a ByteArrayInputStream?, Why ByteArrayInputStream ? why not a custom InputStream imeplementation which really benefits from the streaming approach, and give you the option to stream the contents as they are generated on the fly, instead of it holding the entire report contents in a byte-array, as is the case with using ByteArrayInputStream. Since, this often seems to choke our system with regards to memory footprint, when the generated report contains huge dataset.
Please comment? Is that not possible ? Is there any reason why ByteArrayInputStream is the only way to retrieve the report contents ?
Thanks,
Farhan.

We have new place called Idea Place, look up on the right hand side. Great place to add enhancement requests.
Or the link: http://www.sdn.sap.com/irj/scn/idea-place

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Thanks Daniel for pointing that out. Though you answer is helpful but I am not sure if that is what I would want to do.
The link you provide for csv says "For each report there's an _report.xdo file that contains the XML structure of the report... " It suggests I modify the .xdo file for each report. I currently have 16 reports.
Does it mean I modify the .xdo file for all 16 and what happens if someone creates a 17th report ?
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Finally, the link you provide says after doing what it suggest "Now log back into BI publisher and select the report. You should now be able to see that CSV is now an option."
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Please VOTE as HELPFUL if the post helps you and remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
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Hi all;
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Please VOTE as HELPFUL if the post helps you and remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
the thread.

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ColdFusion 8: Working with PDFs (Part 3) (July 13, 2007)
ColdFusion 8: Working with PDFs (Part 4) (July 13, 2007)
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Generate & Export PDF/CSV on the fly without holding entire contents in mem

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