(PowerShell) Build a multipart/related MIME Message

Demonstrates how to construct a multipart/related MIME message containing HTML and a related JPG image.

Chilkat .NET Downloads

Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# Start with an empty MIME object...
$mime = New-Object Chilkat.Mime

# Initialize it as multipart/related.
$mime.NewMultipartRelated()

# Set a top-level MIME header field.
$mime.SetHeaderField("Subject","Test HTML email with JPG image.")

# Generate a Content-ID.  This will contain random data that will allow
# the HTML's "img" tag to reference the image part in the MIME.
$crypt = New-Object Chilkat.Crypt2
$crypt.EncodingMode = "hex"

$sbContentId = New-Object Chilkat.StringBuilder
$sbContentId.Append("part1.")
$sbContentId.Append($crypt.GenRandomBytesENC(4))
$sbContentId.Append(".")
$sbContentId.Append($crypt.GenRandomBytesENC(4))
$sbContentId.Append("@chilkatsoft.com")

# Create the HTML body.
$sbHtml = New-Object Chilkat.StringBuilder
$sbHtml.Append("<html><head>`r`n")
$sbHtml.Append("<meta http-equiv=`"Content-Type`" content=`"text/html; charset=utf-8`">`r`n")
$sbHtml.Append("  </head>`r`n")
$sbHtml.Append("  <body bgcolor=`"#FFFFFF`" text=`"#000000`">`r`n")
$sbHtml.Append("    <p>This is a test.&nbsp; <img src=`"cid:CONTENT_ID`" height=`"20`" width=`"20`"></p>`r`n")
$sbHtml.Append("  </body>`r`n")
$sbHtml.Append("</html>`r`n")
$numReplacements = $sbHtml.Replace("CONTENT_ID",$sbContentId.GetAsString())

# Create the HTML MIME part.
$htmlMime = New-Object Chilkat.Mime
$htmlMime.SetBodyFromHtml($sbHtml.GetAsString())
$htmlMime.Encoding = "8bit"
$htmlMime.Charset = "utf-8"

# Load our JPG image from a file.
$fac = New-Object Chilkat.FileAccess

$jpgBytes = $fac.ReadEntireFile("qa_data/jpg/starfish20.jpg")

# Create an image/jpeg MIME part.
$jpgMime = New-Object Chilkat.Mime
$jpgMime.SetBodyFromBinary($jpgBytes)
# Setting the following properties has the effect of adding
# the Content-Type, Content-Transfer-Encoding, and Content-Disposition header fields.
# These header fields could also be set via the SetHeaderField method, in which case
# the values of the affected properties would be updated.
$jpgMime.ContentType = "image/jpeg"
$jpgMime.Name = "starfish20.jpg"
$jpgMime.Encoding = "base64"
$jpgMime.Disposition = "inline"
$jpgMime.Filename = "starfish20.jpg"

$sbContentIdHdr = New-Object Chilkat.StringBuilder
$sbContentIdHdr.Append("<CONTENT_ID>")
$numReplacements = $sbContentIdHdr.Replace("CONTENT_ID",$sbContentId.GetAsString())
$jpgMime.SetHeaderField("Content-ID",$sbContentIdHdr.GetAsString())

# Add both parts as children of the multipart/related
$mime.AppendPart($htmlMime)
$mime.AppendPart($jpgMime)
$($mime.GetMime())

# --------------------------------------------------------------
# --------------------------------------------------------------
# This example builds the following MIME message.  The boundary
# and Content-ID strings contain random data and will be different.  

# Content-Type: multipart/related; boundary="------------A940F1230E6F0105F03DB2CB"
# Subject: Test HTML email with JPG image.
# 
# --------------A940F1230E6F0105F03DB2CB
# Content-Type: text/html; charset="utf-8"
# Content-Transfer-Encoding: 8bit
# 
# <html><head>
# <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
#   </head>
#   <body bgcolor="#FFFFFF" text="#000000">
#     <p>This is a test.&nbsp; <img src="cid:part1.E16AE3B4.1505C436@chilkatsoft.com" height="20" width="20"></p>
#   </body>
# </html>
# 
# --------------A940F1230E6F0105F03DB2CB
# Content-Transfer-Encoding: base64
# Content-Type: image/jpeg; name="starfish20.jpg"
# Content-Disposition: inline; filename="starfish20.jpg"
# Content-ID: <part1.E16AE3B4.1505C436@chilkatsoft.com>
# 
# /9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
# NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
# YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
# Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
# AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
# NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
# pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
# Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
# enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
# xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
# DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
# AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
# QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
# EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==
# 
# --------------A940F1230E6F0105F03DB2CB--
#