Perl

Get the Nth Binary Part of a Content-Type into BinData

Demonstrates the Chilkat Email.GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth MIME sub-part matching a content-type pattern into a BinData object. The arguments are the zero-based index among the matching parts, the content-type pattern, an inlineOnly flag, an excludeAttachments flag, and the BinData that receives the bytes. This example extracts the first image/png part.

Background: This is the binary, type-targeted way to pull a specific part out of a message — ideal for extracting, say, every image/png or the one application/pdf from a complex MIME tree without caring whether it is an attachment, an inline image, or a body part. Reading into a BinData keeps the raw bytes exact, ready to save, hash, or re-transmit.

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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates the GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth
# MIME sub-part matching a Content-Type pattern into a BinData object.  The arguments are
# the zero-based index among matching parts, the Content-Type pattern, inlineOnly,
# excludeAttachments, and the BinData that receives the bytes.

my $email = Chilkat2::Email->new;
$email->Subject('GetNthBinaryPartOfTypeBd example');
$email->Body('See the attached image.');

# Load the image from a file into a BinData object and attach it (binary data belongs
# in a BinData, never in a string).
my $bdImage = Chilkat2::BinData->new;
my $success = $bdImage->LoadFile('qa_data/images/photo.png');
if (!$success) {
    print $bdImage->LastErrorText, "\n";
    exit;
}

$success = $email->AddAttachmentBd('photo.png', $bdImage, 'image/png');
if (!$success) {
    print $email->LastErrorText, "\n";
    exit;
}

# Load the bytes of the first (index 0) image/png part into a BinData object.
my $bd = Chilkat2::BinData->new;
$success = $email->GetNthBinaryPartOfTypeBd(0, 'image/png', 0, 0, $bd);
if (!$success) {
    print $email->LastErrorText, "\n";
    exit;
}

print 'image/png part size (bytes) = ', $bd->NumBytes, "\n";

# Note: The path "qa_data/images/photo.png" is a relative local filesystem path,
# relative to the current working directory of the running application.