PowerShell

Get the Decoded MIME Body Bytes (BinData)

Demonstrates the Chilkat Mime.GetBodyBd method, which replaces the contents of a BinData with the decoded body bytes of the current part. The only argument is the BinData. Base64 and quoted-printable are decoded; headers and boundaries are not included.

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 extract a part's actual content as bytes — the decoded payload of an attachment or an image, ready to hash, re-save, or hand to another API. Because it works in raw bytes it is the correct choice for binary parts, where a text decode would be wrong. Note it replaces the BinData contents rather than appending.

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

$success = $false

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

#  Replace the contents of a BinData with the decoded body bytes of the current part.  Base64 and
#  quoted-printable are decoded; MIME headers and multipart boundaries are not included.
$bd = New-Object Chilkat.BinData
$success = $mime.GetBodyBd($bd)
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

$("Decoded body: " + $bd.NumBytes + " bytes.")