PowerShell

Save All MIME Attachments to Files

Demonstrates the Chilkat Mime.PartsToFiles method, which recursively traverses the MIME tree and saves each part having a nonempty filename parameter to a directory. The first argument is the destination directory and the second is a StringTable that receives the saved filenames.

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 extracts every named attachment from a message in one call, walking the whole tree so it finds attachments nested inside multipart containers. It saves only parts that declare a filename — inline body parts without one are skipped — and reports what it wrote via the StringTable, which is handy for logging or follow-up processing. The destination directory must already exist.

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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
}

#  Recursively traverse the MIME tree and save each part that has a nonempty "filename" parameter
#  to a directory.  The 1st argument is the destination directory and the 2nd is a StringTable
#  that receives the saved filenames.
$savedFiles = New-Object Chilkat.StringTable
$success = $mime.PartsToFiles("qa_output/attachments",$savedFiles)
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

$n = $savedFiles.Count
$("Saved " + $n + " files:")

for ($i = 0; $i -le $n - 1; $i++) {
    $name = $savedFiles.StringAt($i)
    if ($savedFiles.LastMethodSuccess -eq $false) {
        $($savedFiles.LastErrorText)
        exit
    }

    $($name)
}