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Create a multipart/alternative MIME Entity

Demonstrates the Chilkat Mime.NewMultipartAlternative method, which initializes the object as an empty multipart/alternative entity. It takes no arguments; the alternative representations are then appended.

Background: multipart/alternative holds several renderings of the same content and lets the client pick the best one it can display — the standard way to send an email as both plain text and HTML. Order matters: parts go from least to most preferred, so the plain-text version comes first and the HTML last, and a client shows the last one it understands.

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

$success = $false

#  Demonstrates the Mime.NewMultipartAlternative method, which initializes the object as an empty
#  multipart/alternative entity, clearing any existing content.  It takes no arguments.

$mime = New-Object Chilkat.Mime

$success = $mime.NewMultipartAlternative()
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

#  multipart/alternative holds two representations of the SAME content; the client displays the
#  last one it can render.  Add a plain-text part, then an HTML part.
$textPart = New-Object Chilkat.Mime
$success = $textPart.SetBodyFromPlainText("Hello (plain text version).")
if ($success -eq $false) {
    $($textPart.LastErrorText)
    exit
}

$success = $mime.AppendPart($textPart)
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

$htmlPart = New-Object Chilkat.Mime
$success = $htmlPart.SetBodyFromHtml("<html><body><b>Hello</b> (HTML version).</body></html>")
if ($success -eq $false) {
    $($htmlPart.LastErrorText)
    exit
}

$success = $mime.AppendPart($htmlPart)
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

$("Number of alternatives: " + $mime.NumParts)