Perl

Convert a MIME Entity to multipart/mixed

Demonstrates the Chilkat Mime.ConvertToMultipartMixed method, which wraps the current entity in a new outer multipart/mixed, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you turn an existing single-part message into one that can hold attachments — rather than rebuilding it, you wrap it, and its content becomes the first child of a new multipart/mixed. Message-level and custom headers are carried onto the new outer entity so the message identity is preserved. Afterward, AppendPartFromFile adds attachments beside the original body.

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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

my $mime = Chilkat2::Mime->new;
my $success = $mime->LoadMimeFile('qa_data/message.eml');
if (!$success) {
    print $mime->LastErrorText, "\n";
    exit;
}

# Wrap the current entity in a new outer multipart/mixed entity.  The original entity becomes the
# first child, which is what you do to add attachments to an existing single-part message.
$success = $mime->ConvertToMultipartMixed();
if (!$success) {
    print $mime->LastErrorText, "\n";
    exit;
}

# Now attachments can be appended alongside the original content.
$success = $mime->AppendPartFromFile('qa_data/report.pdf');
if (!$success) {
    print $mime->LastErrorText, "\n";
    exit;
}

print 'Number of parts: ', $mime->NumParts, "\n";