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(Excel) 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";
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--------------080707010302060306060800--

Download Excel Class Modules

Chilkat Excel Class Modules

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

Dim mime As Chilkat.Mime
Set mime = Chilkat.NewMime

' 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 = False) Then
    Debug.Print mime.LastErrorText
    Exit Sub
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.

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")
Debug.Print "Filename: "; filename

' Because the "filename" is so often accessed, it is also available
' by accessing the "Filename" property:
Debug.Print "Filename: "; part2.Filename

' The disposition (without attributes) which in this case 
' is the string "attachment" is accessed via the Disposition property:
Debug.Print "Disposition: "; part2.Disposition

' To get the full value of the Content-Disposition header field,
' call GetHeaderField.
Debug.Print "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")
Debug.Print "Content-Type name: "; name

' Because the "name" is so often accessed, it is also available
' by accessing the "Name" property:
Debug.Print "Content-Type name: "; part2.Name

' The content-type without attributes is available in the
' ContentType property:
Debug.Print "Content-Type: "; part2.ContentType

' To get the full value of the Content-Type header field,
' call GetHeaderField.
Debug.Print "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:
Debug.Print "Content-Transfer-Encoding: "; part2.Encoding
Debug.Print "Content-Transfer-Encoding: "; part2.GetHeaderField("Content-Transfer-Encoding")

Debug.Print "Finished."

 

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