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PrintDocument() gives blank pages
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einar View Drop Down
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Joined: 18 Mar 10
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Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote einar Quote  Post ReplyReply Direct Link To This Post Topic: PrintDocument() gives blank pages
    Posted: 15 Jul 11 at 9:02AM
I have a laboratorysystem creating PDF files. In addition to sending the PDF's with e-mails, the system prints a hardcopy. After adding NeeviaPDF to sign visually, the printing using LoadFromFile() and PrintDocument() gives blank pages. If I open the PDF with Acrobat, printing is OK.
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Ingo View Drop Down
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Points: 3530 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 11 at 11:02PM
Hi!

A relevant code-snippet would be good ;-)

Cheers, Ingo
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AndrewC View Drop Down
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Points: 841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndrewC Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jul 11 at 9:10AM
What is the return values from the LoadFromFile call ?  1 or 2.  If it is 2 then the PDF could be malformed or password protected.
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tfrost View Drop Down
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Points: 437 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tfrost Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jul 11 at 12:57PM
What version of QuickPDF?  I have seen PDFs rendered with blank pages in 7.24 which are OK using 7.26.
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AndrewC View Drop Down
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Points: 841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndrewC Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jul 11 at 1:20PM
If a document is malfored and returns 2 from LoadFromFile() it will then print a blank page as there is actually no document loaded to even be printed.

We are trying to include fixes for these malformed documents when we find them but this is not always easy.   There are PDF's out there that contain spelling errors, invalid xref tables, missing keys etc.   Unfortunately, Adode Acrobat opens these files so everyone expects every other PDF library should be able to open the same files.  Adobe have hundreds of programmers and sell their tools for many thousands of dollars.
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