PowerShell

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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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$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 = New-Object Chilkat.Email
$email.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>")

$("NumRelatedItems before = " + $email.NumRelatedItems)

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

$success = $email.ConvertInlineImages()
if ($success -eq $false) {
    $($email.LastErrorText)
    exit
}

$("NumRelatedItems after = " + $email.NumRelatedItems)