Xbase++

Parse MIME Header Fields

See more MIME Examples

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
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
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--------------080707010302060306060800--

Xbase++

LOCAL nSuccess
LOCAL oMime
LOCAL oPart2
LOCAL cFilename
LOCAL cName

nSuccess := 0

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

oMime := CreateObject("Chilkat.Mime")

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

nSuccess := oMime:LoadMimeFile("sampleMime2.txt")
IF (nSuccess == 0)
    ? oMime:LastErrorText
    oMime:destroy()
    RETURN
ENDIF

//  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.
oPart2 := CreateObject("Chilkat.Mime")
nSuccess := oMime:PartAt(1, oPart2)
IF (nSuccess == 0)
    ? oMime:LastErrorText
    oMime:destroy()
    oPart2:destroy()
    RETURN
ENDIF

//  -------------------------------
//  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.
cFilename := oPart2:GetHeaderFieldAttribute("Content-Disposition", "filename")
? "Filename: " + cFilename

//  Because the "filename" is so often accessed, it is also available
//  by accessing the "Filename" property:
? "Filename: " + oPart2:Filename

//  The disposition (without attributes) which in this case 
//  is the string "attachment" is accessed via the Disposition property:
? "Disposition: " + oPart2:Disposition

//  To get the full value of the Content-Disposition header field,
//  call GetHeaderField.
? "Content-Disposition: " + oPart2: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
cName := oPart2:GetHeaderFieldAttribute("Content-Type", "name")
? "Content-Type name: " + cName

//  Because the "name" is so often accessed, it is also available
//  by accessing the "Name" property:
? "Content-Type name: " + oPart2:Name

//  The content-type without attributes is available in the
//  ContentType property:
? "Content-Type: " + oPart2:ContentType

//  To get the full value of the Content-Type header field,
//  call GetHeaderField.
? "Content-Type: " + oPart2: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:
? "Content-Transfer-Encoding: " + oPart2:Encoding
? "Content-Transfer-Encoding: " + oPart2:GetHeaderField("Content-Transfer-Encoding")

? "Finished."

oMime:destroy()
oPart2:destroy()