function SignPDF()
{
$infile = '../../TestFiles/doc_to_sign.pdf';
$outfile = '../../TestFiles/Output/signed_doc.pdf';
$certfile = '../../TestFiles/pdftron.pfx';
$imagefile = '../../TestFiles/signature.jpg';
$result = true;
try {
echo nl2br('Signing PDF document: "' . $infile . '".' . PHP_EOL);
// Open an existing PDF
$doc = new PDFDoc($infile);
// Add an StdSignatureHandler instance to PDFDoc, making sure to keep track of it using the ID returned.
$sigHandlerId = $doc->AddStdSignatureHandler($certfile, "password");
// Obtain the signature form field from the PDFDoc via Annotation.
$sigField = $doc->GetField('Signature1');
$widgetAnnot = new Widget($sigField->GetSDFObj());
# Tell PDFNetC to use the SignatureHandler created to sign the new signature form field.
$sigDict = $sigField->UseSignatureHandler($sigHandlerId);
// Add more information to the signature dictionary.
$sigDict->PutName('SubFilter', 'adbe.pkcs7.detached');
$sigDict->PutString('Name', 'PDFTron');
$sigDict->PutString('Location', 'Vancouver, BC');
$sigDict->PutString('Reason', 'Document verification.');
// Create a signature appearance
$apWriter = new ElementWriter();
$apBuilder = new ElementBuilder();
$apWriter->Begin($doc->GetSDFDoc());
$sigImg = Image::Create($doc->GetSDFDoc(), $imagefile);
$w = floatval($sigImg->GetImageWidth());
$h = floatval($sigImg->GetImageHeight());
$apElement = $apBuilder->CreateImage($sigImg, 0.0, 0.0, $w, $h);
$apWriter->WritePlacedElement($apElement);
$apObj = $apWriter->End();
$apObj->PutRect('BBox', 0.0, 0.0, $w, $h);
$apObj->PutName('Subtype', 'Form');
$apObj->PutName('Type', 'XObject');
$apWriter->Begin($doc->GetSDFDoc());
$apElement = $apBuilder->CreateForm($apObj);
$apWriter->WritePlacedElement($apElement);
$apObj = $apWriter->End();
$apObj->PutRect('BBox', 0.0, 0.0, $w, $h);
$apObj->PutName('Subtype', 'Form');
$apObj->PutName('Type', 'XObject');
$widgetAnnot->SetAppearance($apObj);
$widgetAnnot->RefreshAppearance();
// Save the PDFDoc. Once the method below is called, PDFNetC will also sign the document using the information
// provided.
$doc->Save($outfile, 0);
echo nl2br('Finished signing PDF document' . PHP_EOL);
$doc->Close();
} catch (Exception $e) {
echo nl2br($e->getMessage() . PHP_EOL);
echo nl2br($e->getTraceAsString() . PHP_EOL);
$result = false;
}
return $result;
}
case Field::e_text:
echo nl2br("Text\n");
// Edit all variable text in the document
$itr->Current()->SetValue("This is a new value. The old one was: " . $str_val);
break;
case Field::e_choice:
echo nl2br("Choice\n");
break;
case Field::e_signature:
echo nl2br("Signature\n");
break;
}
echo "------------------------------\n";
}
// Search for a specific field
$f = $doc->GetField("employee.name.first");
if ($f) {
echo nl2br("Field search for " . $f->GetName() . " was successful\n");
} else {
echo nl2br("Field search failed\n");
}
// Regenerate field appearances.
$doc->RefreshFieldAppearances();
$doc->Save($output_path . "forms_test_edit.pdf", 0);
echo nl2br("Done.\n");
//----------------------------------------------------------------------------------
// Sample: Form templating
// Replicate pages and form data within a document. Then rename field names to make
// them unique.
//----------------------------------------------------------------------------------
// Sample: Copying the page with forms within the same document
