(VBScript) Iterate MIME Parts of an Email

Demonstrates how to iterate over the MIME sub-parts of an email, and retrieve the content of each MIME sub-part body.

Note: This example requires some new features added to Chilkat v9.5.0.95.

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

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' See the following Chilkat post to Quickly Understand Email MIME

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Email")
set email = CreateObject("Chilkat.Email")

success = email.LoadEml("qa_data/eml/sample.eml")
If (success = 0) Then
    outFile.WriteLine("Failed to load .eml")
    WScript.Quit
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbContentType = CreateObject("Chilkat.StringBuilder")
caseSensitive = 0

' Get the total number of non-multipart MIME sub-parts.
' (This is a simple way of iterating over all the MIME leaf parts regardless of the MIME tree structure)
inlineOnly = 0
excludeAttachments = 0
searchSpec = "*/*"

numParts = email.GetNumPartsOfType(searchSpec,inlineOnly,excludeAttachments)
i = 0
Do While i < numParts
    ' What is the Content-Type of this MIME part?
    success = sbContentType.Append(email.GetNthContentType(i,searchSpec,inlineOnly,excludeAttachments))
    If (sbContentType.StartsWith("text/",caseSensitive) = 1) Then
        ' Get the text body of this MIME part.
        textBody = email.GetNthTextPartOfType(i,searchSpec,inlineOnly,excludeAttachments)
        outFile.WriteLine("Got text body for " & sbContentType.GetAsString())
    Else
        If (sbContentType.ContentsEqual("message/rfc822",caseSensitive) = 1) Then
            ' If the Content-Type is message/rfc822, then the MIME body for this part contains a full embedded MIME messages.
            ' Your application could load it into a Chilkat email object and recursively process...
            ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Email")
            set attachedEmail = CreateObject("Chilkat.Email")
            ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
            set bdMime = CreateObject("Chilkat.BinData")
            success = email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bdMime)
            success = attachedEmail.SetFromMimeBd(bdMime)
            ' Now your app can recursively process the attachedEmail...
        Else
            ' Get the bytes of this MIME body part.
            ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
            set bd = CreateObject("Chilkat.BinData")
            success = email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bd)
            outFile.WriteLine("Got binary body for " & sbContentType.GetAsString() & " numBytes = " & bd.NumBytes)
        End If

    End If

    sbContentType.Clear 
    i = i + 1
Loop

outFile.Close