问题
I am trying to add an existing PDF (created otherwise) to a PDF created with FPDF using FPDI. It seems to work find for most PDFs, but I get the following error:
FPDF error: Unable to find xref table.
After some testing, I figured out that if I use a PDF version of 1.4 or lower (Acrobat v5 or lower) it seems to work. Looking at the file it seems to be because of a different PDF format.
Is there a work around or solution to this? I have probably 10 000+ PDFs uploaded by users, some of the new working, some of them not. It's also annoying that FPDI just dies instead of causing some kind of error or even returning false
The only solution I can think of right now is to parse the first line of the PDF file to determine the version and only add the ones that over versions that will work.
Edit:
I also tried this in Zend_Pdf and it had the following result, using the demo file that comes with the Zend Framework:
Fatal error: Uncaught exception 'Zend_Pdf_Exception' with message 'Cross-reference streams are not supported yet.' in /Volumes/Documents/temp/ZendFramework-1.7.7/library/Zend/Pdf/Parser.php:331
Stack trace:
#0 /Volumes/Documents/temp/ZendFramework-1.7.7/library/Zend/Pdf/Parser.php(455): Zend_Pdf_Parser->_loadXRefTable('116')
#1 /Volumes/Documents/temp/ZendFramework-1.7.7/library/Zend/Pdf.php(297): Zend_Pdf_Parser->__construct('/Volumes/Docume...', Object(Zend_Pdf_ElementFactory_Proxy), true)
#2 /Volumes/Documents/temp/ZendFramework-1.7.7/library/Zend/Pdf.php(250): Zend_Pdf->__construct('/Volumes/Docume...', NULL, true)
#3 /Volumes/Documents/temp/ZendFramework-1.7.7/demos/Zend/Pdf/demo.php(37): Zend_Pdf::load('/Volumes/Docume...')
#4 {main}
thrown in /Volumes/Documents/temp/ZendFramework-1.7.7/library/Zend/Pdf/Parser.php on line 331
Is it impossible to parse PDFs greater than 1.4?
回答1:
You can use FPDI with TCPDF, it will generate and read (with FPDI) version 1.7 PDFs.
See TCPDF - PHP class for PDF.
EDIT
I have recently been challenged with the issue of using various versions and formats of PDF with FPDI and TCPDF, and I can confirm that PDF versions above 1.4 are hit and miss, the interesting thing is that I have a lot of working 1.7 PDFs, and works about 50/50 on 1.5 and 1.6.
I worked around the issue by converting all non-workable PDF files to v1.4 using GhostScript which you can exec from the command line. Use ps2pdf14 from the GhostScript lib folder.
回答2:
I've just released a pair of projects (TCPDI / tcpdi_parser, based on FPDI and tcpdf_parser, respectively) which work with TCPDF 6 (and FPDF_TPL) to import PDFs above v1.4 (tested up to 1.6 so far, but I'll make sure it works with 1.7 once I find a 1.7 PFD to test it with!) without requiring any commercial addons. Basic installation and usage instructions can be found in the TCPDI README; please feel free to try it out and report any issues via the Github tracker.
回答3:
Setasign is offering a PDF parser as a commercial addon to FPDI. We had no troubles parsing PDF files up to version 1.7 so far using the new parser.
回答4:
I found that using commerical version of FPDI PDF-Parser solved my problem. I've been using it for a year now and haven't had any PDFs it couln't parse (unless the PDF was corrupt or had something else weird going on).
回答5:
for symfony, I used this lib to convert >1.4 https://packagist.org/packages/xthiago/pdf-version-converter
回答6:
If you have Acrobat PDF writer, you can manipulate the job settings to make the PDF you are printing/savingAs to be compatible to PDF 1.4. For the tiny reason I need this product, it doesn't seem worth the 100 euros to get the commercial version that is compatible to versions greater than 1.4.
回答7:
my team had removed some part of the code. we stopped the code from adding watermark to the pdf. this solved the problem for us. PDF >= 1.5
来源：https://stackoverflow.com/questions/660425/is-there-a-way-to-make-fpdf-fpdi-or-zend-pdf-support-the-parsing-of-pdfs-greater