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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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Local $bSuccess = False

$oMime = ObjCreate("Chilkat.Mime")
$bSuccess = $oMime.LoadMimeFile("qa_data/multipart_message.eml")
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

;  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.
Local $iN = $oMime.NumParts
ConsoleWrite("Number of parts: " & $iN & @CRLF)

$oPart = ObjCreate("Chilkat.Mime")
Local $i
For $i = 0 To $iN - 1
    $bSuccess = $oMime.PartAt($i,$oPart)
    If ($bSuccess = False) Then
        ConsoleWrite($oMime.LastErrorText & @CRLF)
        Exit
    EndIf

    ConsoleWrite("Part " & $i & " Content-Type: " & $oPart.ContentType & @CRLF)
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