Chilkat2-Python

Get the Content-Location of a Related Item

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Demonstrates the Chilkat Email.GetRelatedContentLocation method, which returns the Content-Location of a related item (typically an image or style sheet embedded within an HTML email). The index is zero-based. This example loads an image from a file into a BinData object and adds it as a related item addressed by Content-Location using AddRelatedBd2, then reads it back.

Background: Content-Location is the alternative to Content-ID for linking HTML to its embedded resources. Instead of a cid: reference, the HTML keeps an ordinary-looking src="logo.png", and the matching part carries a Content-Location of logo.png. Since the image is binary, it is loaded into a BinData object and added with AddRelatedBd2. This approach is common when an existing web page is turned into an email, since the original relative URLs can stay unchanged.

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import sys
import chilkat2

success = False

# Demonstrates the GetRelatedContentLocation method, which returns the Content-Location of
# a related item.  Related items are typically images and style sheets embedded within
# HTML emails.  The index is zero-based.

email = chilkat2.Email()
email.Subject = "GetRelatedContentLocation example"

# The HTML references the image by the same name used as the Content-Location.
email.SetHtmlBody("<html><body><img src=\"logo.png\"/></body></html>")

# Load the image data from a file into a BinData object.
bdImage = chilkat2.BinData()
success = bdImage.LoadFile("qa_data/images/logo.png")
if (success == False):
    print(bdImage.LastErrorText)
    sys.exit()

# Add the image as a related item addressed by Content-Location "logo.png".
success = email.AddRelatedBd2(bdImage,"logo.png")
if (success == False):
    print(email.LastErrorText)
    sys.exit()

# Read the Content-Location of the first related item (index 0).
loc = email.GetRelatedContentLocation(0)
print("Related item 0 Content-Location: " + loc)

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