(VBScript) Parse MIME Header Fields

Demonstrates how to parse MIME header fields, including Content-Type, Content-Disposition, and Content-Transfer-Encoding.

This example uses a MIME test file located at http://www.chilkatsoft.com/testData/sampleMime2.txt. It contains the following MIME:

Content-Type: multipart/mixed;
 boundary="------------080707010302060306060800";

This is a multi-part message in MIME format.

--------------080707010302060306060800
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body.
--------------080707010302060306060800
Content-Disposition: attachment; filename="starfish.gif";
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif";

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
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--------------080707010302060306060800--

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

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

' Load the sampleMime2.txt file into the MIME object.
' (This file is available at http://www.chilkatsoft.com/testData/sampleMime2.txt )

success = mime.LoadMimeFile("sampleMime2.txt")
If (success = 0) Then
    outFile.WriteLine(mime.LastErrorText)
    WScript.Quit
End If

' The GIF image is the 2nd sub-part located directly under the
' top-level MIME node.  Indexing begins at 0, therefore the 2nd
' sub-part is at index 1.

' part2 is a Chilkat.Mime
Set part2 = mime.GetPart(1)

' -------------------------------
' Content-Disposition
' -------------------------------
' In this example, the Content-Disposition header field
' contains this value:
' attachment; filename="starfish.gif"

' To get the "filename", call GetHeaderFieldAttribute
' Header field names and attribute names are case insensitive.
filename = part2.GetHeaderFieldAttribute("Content-Disposition","filename")
outFile.WriteLine("Filename: " & filename)

' Because the "filename" is so often accessed, it is also available
' by accessing the "Filename" property:
outFile.WriteLine("Filename: " & part2.Filename)

' The disposition (without attributes) which in this case 
' is the string "attachment" is accessed via the Disposition property:
outFile.WriteLine("Disposition: " & part2.Disposition)

' To get the full value of the Content-Disposition header field,
' call GetHeaderField.
outFile.WriteLine("Content-Disposition: " & part2.GetHeaderField("Content-Disposition"))

' -------------------------------
' Content-Type
' -------------------------------
' In this example, the Content-Type header field
' contains this value:
' image/gif; name="starfish.gif"

' To get the "name", call GetHeaderFieldAttribute
name = part2.GetHeaderFieldAttribute("Content-Type","name")
outFile.WriteLine("Content-Type name: " & name)

' Because the "name" is so often accessed, it is also available
' by accessing the "Name" property:
outFile.WriteLine("Content-Type name: " & part2.Name)

' The content-type without attributes is available in the
' ContentType property:
outFile.WriteLine("Content-Type: " & part2.ContentType)

' To get the full value of the Content-Type header field,
' call GetHeaderField.
outFile.WriteLine("Content-Type: " & part2.GetHeaderField("Content-Type"))

' -------------------------------
' Content-Transfer-Encoding
' -------------------------------

' The Encoding property contains the value of the
' Content-Transfer-Encoding property. 
' Calling GetHeaderField("Content-Transfer-Encoding") is
' equivalent to accessing the Encoding property:
outFile.WriteLine("Content-Transfer-Encoding: " & part2.Encoding)
outFile.WriteLine("Content-Transfer-Encoding: " & part2.GetHeaderField("Content-Transfer-Encoding"))

outFile.WriteLine("Finished.")

outFile.Close