(Ruby) Parse MIME to get Binary Data (such as GIF, JPG, or any binary file)

Demonstrates how to parse a MIME to get binary data. This example extracts the image data for a GIF image to an in-memory byte array, and also to a file.

This example uses a MIME test file located at http://www.chilkatsoft.com/testData/sampleMime2.txt. It contains the following MIME:

Content-Type: multipart/mixed;
 boundary="------------080707010302060306060800";

This is a multi-part message in MIME format.

--------------080707010302060306060800
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body.
--------------080707010302060306060800
Content-Disposition: attachment; filename="starfish.gif";
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif";

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
zu/Oxta1rb17a6UhAK0hAPe9rb2Ec7V7a71rUpwpCL0xCJwhAOfOxta9tcatpdallM6cjMaUhK1C
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--------------080707010302060306060800--

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

mime = Chilkat::CkMime.new()

# Load the sampleMime2.txt file into the MIME object.
# (This file is available at https://www.chilkatsoft.com/testData/sampleMime2.txt )

success = mime.LoadMimeFile("sampleMime2.txt")
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

# The GIF image is the 2nd sub-part located directly under the
# top-level MIME node.  Indexing begins at 0, therefore the 2nd
# sub-part is at index 1.
# part2 is a CkMime
part2 = mime.GetPart(1)

binaryData = Chilkat::CkByteData.new()

# The GetBodyBinary method returns the binary bytes
# of the part's body, automatically decoded from whatever
# content-transfer-encoding might be used (such as base64).
success = part2.GetBodyBinary(binaryData)

# We now have the binary bytes of the GIF image in binaryData.
# Save it to a file.
fac = Chilkat::CkFileAccess.new()
success = fac.WriteEntireFile("out1.gif",binaryData)
if (success != true)
    print fac.lastErrorText() + "\n";
    exit
end

# An easier way to save the body content to a file,
# assuming your application does not need to access
# the binary data in-memory, is to call SaveBody
success = part2.SaveBody("out2.gif")
if (success == false)
    print part2.lastErrorText() + "\n";
    exit
end

print "Finished." + "\n";