(PowerShell) Iterate MIME Parts of an Email

Demonstrates how to iterate over the MIME sub-parts of an email, and retrieve the content of each MIME sub-part body.

Note: This example requires some new features added to Chilkat v9.5.0.95.

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

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

# See the following Chilkat post to Quickly Understand Email MIME

$email = New-Object Chilkat.Email

$success = $email.LoadEml("qa_data/eml/sample.eml")
if ($success -eq $false) {
    $("Failed to load .eml")
    exit
}

$sbContentType = New-Object Chilkat.StringBuilder
$caseSensitive = $false

# Get the total number of non-multipart MIME sub-parts.
# (This is a simple way of iterating over all the MIME leaf parts regardless of the MIME tree structure)
$inlineOnly = $false
$excludeAttachments = $false
$searchSpec = "*/*"

$numParts = $email.GetNumPartsOfType($searchSpec,$inlineOnly,$excludeAttachments)
$i = 0
while ($i -lt $numParts) {
    # What is the Content-Type of this MIME part?
    $sbContentType.Append($email.GetNthContentType($i,$searchSpec,$inlineOnly,$excludeAttachments))
    if ($sbContentType.StartsWith("text/",$caseSensitive) -eq $true) {
        # Get the text body of this MIME part.
        $textBody = $email.GetNthTextPartOfType($i,$searchSpec,$inlineOnly,$excludeAttachments)
        $("Got text body for " + $sbContentType.GetAsString())
    }
    else {
        if ($sbContentType.ContentsEqual("message/rfc822",$caseSensitive) -eq $true) {
            # If the Content-Type is message/rfc822, then the MIME body for this part contains a full embedded MIME messages.
            # Your application could load it into a Chilkat email object and recursively process...
            $attachedEmail = New-Object Chilkat.Email
            $bdMime = New-Object Chilkat.BinData
            $email.GetNthBinaryPartOfTypeBd($i,$searchSpec,$inlineOnly,$excludeAttachments,$bdMime)
            $attachedEmail.SetFromMimeBd($bdMime)
            # Now your app can recursively process the attachedEmail...
        }
        else {
            # Get the bytes of this MIME body part.
            $bd = New-Object Chilkat.BinData
            $email.GetNthBinaryPartOfTypeBd($i,$searchSpec,$inlineOnly,$excludeAttachments,$bd)
            $("Got binary body for " + $sbContentType.GetAsString() + " numBytes = " + $bd.NumBytes)
        }

    }

    $sbContentType.Clear()
    $i = $i + 1
}