CkPython

Convert Inline Data-URL Images to Related Parts

Demonstrates the Chilkat Email.ConvertInlineImages method, which converts images embedded inline within HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by cid:. This example sets an HTML body containing a data-URL image and converts it.

Background: HTML can embed an image two ways: as a data: URL (the base64 bytes sit right in the src attribute) or as a related part referenced by cid:. Many email clients don't render data: URLs for security reasons, so converting them to proper multipart/related parts — the traditional email way to embed images — greatly improves how reliably the images display.

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CkPython

import sys
import chilkat

success = False

#  Demonstrates the ConvertInlineImages method, which converts images embedded inline within
#  HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by
#  CID.

email = chilkat.CkEmail()
email.put_Subject("Convert inline images")

#  An HTML body with a base64 data-URL image (a 1x1 PNG).
email.SetHtmlBody("<html><body><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==\"/></body></html>")

print("NumRelatedItems before = " + str(email.get_NumRelatedItems()))

#  Convert the inline data-URL image(s) to multipart/related parts referenced by CID.

success = email.ConvertInlineImages()
if (success == False):
    print(email.lastErrorText())
    sys.exit()

print("NumRelatedItems after = " + str(email.get_NumRelatedItems()))