使用FPDM填充PDF遇“Object streams are not supported”错误求助

Why You're Seeing This Error #

The FPDM library you’re using is a lightweight option for PDF form filling, but it has a key limitation: it doesn’t support PDF object streams—a compression feature introduced in PDF 1.5 that’s widely used in modern PDFs to reduce file size. If your template.pdf was saved with this compression enabled, FPDM can’t parse the file correctly, which triggers the error messages you’re encountering.

Quick Fix to Keep Using FPDM #

You can convert your template PDF to a version that doesn’t use object streams, and FPDM should work with it smoothly:

• Using Adobe Acrobat: Open your template PDF, go to File > Save As, select "PDF" as the format, and choose "PDF 1.4" from the compatibility dropdown. Save the new file and use it as your template in the FPDM code.
• Using Ghostscript (command line): Run this command to convert the PDF to version 1.4 (which doesn’t support object streams):

  gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -o converted_template.pdf template.pdf
  

  Replace template.pdf in your FPDM code with the newly generated converted_template.pdf.

Robust Alternatives for Modern PDFs #

If you want to avoid workarounds and work seamlessly with modern PDFs, here are more reliable PHP libraries to consider:

• TCPDF: A widely adopted PDF generation library that also supports form filling. It handles UTF-8 well and is compatible with most PDF versions.
• mPDF: Similar to TCPDF, with strong support for non-Latin languages and modern PDF features like object streams, making form manipulation straightforward.
• PDFtk Server + PHP Wrapper: PDFtk is a dedicated tool for PDF tasks like form filling, merging, and splitting. Using a PHP wrapper to interact with it lets you handle all types of PDFs, including those with object streams.

Here’s a quick example using TCPDF to fill your form:

require_once('tcpdf/tcpdf.php');

// Initialize TCPDF and load the template PDF
$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
$pdf->setSourceFile('template.pdf');
$templatePage = $pdf->importPage(1);
$pdf->AddPage();
$pdf->useTemplate($templatePage, 0, 0, 0, 0, true);

// Populate form fields
$fieldProps = array('lineWidth'=>1, 'borderStyle'=>'solid', 'fillColor'=>[255,255,255]);
$pdf->TextField('name', 50, 10, array('v'=>'My name'), true, $fieldProps);
$pdf->TextField('address', 80, 10, array('v'=>'My address'), true, $fieldProps);
$pdf->TextField('city', 30, 10, array('v'=>'My city'), true, $fieldProps);
$pdf->TextField('phone', 30, 10, array('v'=>'My phone number'), true, $fieldProps);

// Output the filled PDF to the browser
$pdf->Output('filled_form.pdf', 'I');

内容的提问来源于stack exchange，提问作者user12097954