Visual FoxPro

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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LOCAL lnSuccess
LOCAL loEmail

lnSuccess = 0

*  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('Chilkat.Email')
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.

lnSuccess = loEmail.ConvertInlineImages()
IF (lnSuccess = 0) THEN
    ? loEmail.LastErrorText
    RELEASE loEmail
    CANCEL
ENDIF

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

RELEASE loEmail