PowerShell

Check if a MIME Part is an Attachment

Demonstrates the Chilkat Mime.IsAttachment method, which returns whether the current part's Content-Disposition is attachment (matched case-insensitively). It takes no arguments.

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

Background: Whether a part is an attachment is about disposition, not content type — an image can be inline (Content-Disposition: inline) or an attachment. This predicate keys off that header, which is the right basis for deciding what to list as a downloadable attachment versus what to render within the message body.

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

$success = $false

#  Demonstrates the Mime.IsAttachment method, which returns whether the part's Content-Disposition is attachment.  It takes no arguments and applies to the current
#  part.  This example iterates the parts of a multipart message and reports which ones match.

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

$n = $mime.NumParts
$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
    }

    if ($part.IsAttachment()) {
        $("Part " + $i + " (" + $part.ContentType + ") is an attachment.")
    }

}