Perl Requires Chilkat v11.7.0+

Replace the Second (or Every) Occurrence of a Label in a PDF

See more PDF Text Replacement Examples

Demonstrates the "occurrence" member of a label entry. By default the first occurrence of a label, in reading order across the selected pages, is replaced; "occurrence" can be a number for the nth, or "all" for every occurrence. The invoice template has "Ref:" twice. 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_template.pdf

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

$json = chilkat::CkJsonObject->new();
$jsonOut = chilkat::CkJsonObject->new();

#  This template's {{placeholders}} are not being filled here: "keep" leaves them as they are
#  (the default, "error", would refuse to apply while a placeholder on the page has no value).
$json->UpdateString("unusedPlaceholders","keep");

#  "Ref:" appears twice on the page (A-1 near the top, A-2 below the totals).
#  The default replaces the first occurrence only.
$json->UpdateString("labels[0].label","Ref:");
$json->UpdateString("labels[0].value","B-7");
$success = $pdf->TextReplace("check",$json,$jsonOut);
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

print "default: " . $jsonOut->IntOf("replacements[0].count") . " occurrence replaced" . "\r\n";

#  The second occurrence only.
$json->UpdateString("labels[0].occurrence","2");
$success = $pdf->TextReplace("check",$json,$jsonOut);
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

print "occurrence 2: " . $jsonOut->IntOf("replacements[0].count") . " occurrence replaced" . "\r\n";

#  Every occurrence.
$json->UpdateString("labels[0].occurrence","all");
$success = $pdf->TextReplace("apply",$json,$jsonOut);
if ($success == 0) {
    print $pdf->lastErrorText() . "\r\n";
    exit;
}

print "occurrence all: " . $jsonOut->IntOf("replacements[0].count") . " occurrences replaced" . "\r\n";

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

#  Sample output:

#  default: 1 occurrence replaced
#  occurrence 2: 1 occurrence replaced
#  occurrence all: 2 occurrences replaced