PowerShell

Access a Part in a Multipart MIME Entity

Demonstrates the Chilkat Mime.PartAt method, which provides live access to the direct child at a zero-based index. The first argument is the index and the second is a Mime object that will reference the child. Modifying it modifies the child stored in the parent tree.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you reach into a multipart message to inspect or edit an individual part — read a part's Content-Type, extract an attachment's body, or change a part in place. The key point is that the returned Mime is a live reference, not a copy, so edits to it flow back into the parent tree. Loop from 0 to NumParts - 1 to visit every direct child.

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

$success = $false

$mime = New-Object Chilkat.Mime
$success = $mime.LoadMimeFile("qa_data/multipart_message.eml")
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

#  PartAt provides LIVE access to a direct child part.  The 1st argument is the zero-based index
#  and the 2nd is a Mime object that will reference the child.  Modifying it modifies the child in
#  the parent tree.
$n = $mime.NumParts
$("Number of parts: " + $n)

$part = New-Object Chilkat.Mime

for ($i = 0; $i -le $n - 1; $i++) {
    $success = $mime.PartAt($i,$part)
    if ($success -eq $false) {
        $($mime.LastErrorText)
        exit
    }

    $("Part " + $i + " Content-Type: " + $part.ContentType)
}