PowerBuilder

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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integer li_rc
integer li_Success
oleobject loo_Email

li_Success = 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.

loo_Email = create oleobject
li_rc = loo_Email.ConnectToNewObject("Chilkat.Email")
if li_rc < 0 then
    destroy loo_Email
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Email.Subject = "Convert inline images"

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

Write-Debug "NumRelatedItems before = " + string(loo_Email.NumRelatedItems)

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

li_Success = loo_Email.ConvertInlineImages()
if li_Success = 0 then
    Write-Debug loo_Email.LastErrorText
    destroy loo_Email
    return
end if

Write-Debug "NumRelatedItems after = " + string(loo_Email.NumRelatedItems)


destroy loo_Email