(Ruby) Iterate MIME Parts of an Email

Demonstrates how to iterate over the MIME sub-parts of an email, and retrieve the content of each MIME sub-part body.

Note: This example requires some new features added to Chilkat v9.5.0.95.

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.

# See the following Chilkat post to Quickly Understand Email MIME

email = Chilkat::CkEmail.new()

success = email.LoadEml("qa_data/eml/sample.eml")
if (success == false)
    print "Failed to load .eml" + "\n";
    exit
end

sbContentType = Chilkat::CkStringBuilder.new()
caseSensitive = false

# Get the total number of non-multipart MIME sub-parts.
# (This is a simple way of iterating over all the MIME leaf parts regardless of the MIME tree structure)
inlineOnly = false
excludeAttachments = false
searchSpec = "*/*"

numParts = email.GetNumPartsOfType(searchSpec,inlineOnly,excludeAttachments)
i = 0
while i < numParts
    # What is the Content-Type of this MIME part?
    sbContentType.Append(email.getNthContentType(i,searchSpec,inlineOnly,excludeAttachments))
    if (sbContentType.StartsWith("text/",caseSensitive) == true)
        # Get the text body of this MIME part.
        textBody = email.getNthTextPartOfType(i,searchSpec,inlineOnly,excludeAttachments)
        print "Got text body for " + sbContentType.getAsString() + "\n";
    else
        if (sbContentType.ContentsEqual("message/rfc822",caseSensitive) == true)
            # If the Content-Type is message/rfc822, then the MIME body for this part contains a full embedded MIME messages.
            # Your application could load it into a Chilkat email object and recursively process...
            attachedEmail = Chilkat::CkEmail.new()
            bdMime = Chilkat::CkBinData.new()
            email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bdMime)
            attachedEmail.SetFromMimeBd(bdMime)
            # Now your app can recursively process the attachedEmail...
        else
            # Get the bytes of this MIME body part.
            bd = Chilkat::CkBinData.new()
            email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bd)
            print "Got binary body for " + sbContentType.getAsString() + " numBytes = " + bd.get_NumBytes().to_s() + "\n";
        end

    end

    sbContentType.Clear()
    i = i + 1
end