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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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llSuccess = .F.

//  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.

loEmail = createobject("CkEmail")
loEmail.Subject = "Convert inline images"

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

? "NumRelatedItems before = " + str(loEmail.NumRelatedItems)

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

llSuccess = loEmail.ConvertInlineImages()
if (llSuccess = .F.) then
    ? loEmail.LastErrorText
    release loEmail
    return
endif

? "NumRelatedItems after = " + str(loEmail.NumRelatedItems)


release loEmail