VBScript

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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VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

set mime = CreateObject("Chilkat.Mime")
success = mime.LoadMimeFile("qa_data/multipart_message.eml")
If (success = 0) Then
    outFile.WriteLine(mime.LastErrorText)
    WScript.Quit
End If

'  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
outFile.WriteLine("Number of parts: " & n)

set part = CreateObject("Chilkat.Mime")

For i = 0 To n - 1
    success = mime.PartAt(i,part)
    If (success = 0) Then
        outFile.WriteLine(mime.LastErrorText)
        WScript.Quit
    End If

    outFile.WriteLine("Part " & i & " Content-Type: " & part.ContentType)
Next

outFile.Close