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Get the Content-ID of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentID method, which returns the Content-ID 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, adds it as a related item with AddRelatedBd (capturing the generated Content-ID and referencing it from the HTML), then reads that Content-ID back.

Background: The Content-ID is the anchor that ties an inline resource to the HTML that displays it: the body references cid: plus the ID, and the matching related part carries that same Content-ID. Because an image is binary, it is loaded into a BinData object (here from a file) and added with AddRelatedBd. Reading the Content-ID back lets a program verify or rewrite those links — for example when relocating embedded images or converting a message for display outside a mail client.

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

$success = $false

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

$email = New-Object Chilkat.Email
$email.Subject = "GetRelatedContentID example"

#  Load the image data from a file into a BinData object.
$bdImage = New-Object Chilkat.BinData
$success = $bdImage.LoadFile("qa_data/images/logo.png")
if ($success -eq $false) {
    $($bdImage.LastErrorText)
    exit
}

#  Add the image as a related item from the BinData; capture its generated Content-ID.
$cid = $email.AddRelatedBd("logo.png",$bdImage)
if ($email.LastMethodSuccess -eq $false) {
    $($email.LastErrorText)
    exit
}

#  Reference the related item in the HTML body by its Content-ID.
$sbHtml = New-Object Chilkat.StringBuilder
$sbHtml.Append("<html><body><img src=`"cid:PLACEHOLDER_CID`"/></body></html>")
$numReplaced = $sbHtml.Replace("PLACEHOLDER_CID",$cid)
$email.SetHtmlBody($sbHtml.GetAsString())

#  Read the Content-ID of the first related item (index 0).
$cid0 = $email.GetRelatedContentID(0)
$("Related item 0 Content-ID: " + $cid0)

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