Perl Requires Chilkat v11.7.0+

Replace the Value After a Label in a PDF (Re-issue an Invoice)

See more PDF Text Replacement Examples

Demonstrates replacing the values that follow labels such as "Invoice Number:" on a PDF that has no placeholders -- an ordinary invoice. Each entry of the "labels" array names a label as it appears on the page and the new value; the value replaces the rest of the label's line. Label matching ignores case, extra spaces and a trailing colon. The replaced text is read back with ExtractText to confirm it. Perl

use chilkat();

$success = 0;

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  The PDF used in this example is available at invoice_labels.pdf

$pdf = chilkat::CkPdf->new();
$success = $pdf->LoadFile("qa_data/pdf/invoice_labels.pdf");
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

#  The invoice has lines such as "Invoice Number:   INV-2026-0412" and "Total Due:  $1,234.53".
#  Each label's new value replaces whatever follows the label on its line.
$json = chilkat::CkJsonObject->new();
$json->UpdateString("labels[0].label","Invoice Number:");
$json->UpdateString("labels[0].value","INV-2026-0500");
$json->UpdateString("labels[1].label","Invoice Date:");
$json->UpdateString("labels[1].value","April 2, 2026");
$json->UpdateString("labels[2].label","customer");
$json->UpdateString("labels[2].value","Contoso Ltd");
$json->UpdateString("labels[3].label","Total Due:");
$json->UpdateString("labels[3].value","$1,999.99");

$jsonOut = chilkat::CkJsonObject->new();
$success = $pdf->TextReplace("apply",$json,$jsonOut);
if ($success == 0) {
    print "Not applied: " . $jsonOut->emit() . "\r\n";
    if ($success == 0) {
        print $pdf->lastErrorText() . "\r\n";
        exit;
    }

}

$i = 0;
$count_i = $jsonOut->SizeOfArray("replacements");
while ($i < $count_i) {
    $jsonOut->put_I($i);
    print "Replaced the value of \"" . $jsonOut->stringOf("replacements[i].label") . "\" on page " . $jsonOut->stringOf("replacements[i].pages") . "\r\n";
    $i = $i + 1;
}

$success = $pdf->WriteFile("qa_output/invoice_reissued.pdf");
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

#  Read the new values back with ExtractText's label option.
$jsonRead = chilkat::CkJsonObject->new();
$jsonText = chilkat::CkJsonObject->new();
$jsonRead->UpdateString("label","Total Due");
$jsonRead->UpdateString("labelValue","right");
$success = $pdf->ExtractText("text",$jsonRead,$jsonText);
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

print "Total Due is now: " . $jsonText->stringOf("text") . "\r\n";

#  Sample output:

#  Replaced the value of "Invoice Number:" on page 1
#  Replaced the value of "Invoice Date:" on page 1
#  Replaced the value of "customer" on page 1
#  Replaced the value of "Total Due:" on page 1
#  Total Due is now: $1,999.99