(DataFlex) 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
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
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--------------080707010302060306060800--

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

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoMime
    Boolean iSuccess
    Variant vPart2
    Handle hoPart2
    String sFilename
    String sName
    String sTemp1

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

    Get Create (RefClass(cComChilkatMime)) To hoMime
    If (Not(IsComObjectCreated(hoMime))) Begin
        Send CreateComObject of hoMime
    End

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

    Get ComLoadMimeFile Of hoMime "sampleMime2.txt" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMime To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // 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.

    Get ComGetPart Of hoMime 1 To vPart2
    If (IsComObject(vPart2)) Begin
        Get Create (RefClass(cComChilkatMime)) To hoPart2
        Set pvComObject Of hoPart2 To vPart2
    End

    // -------------------------------
    // 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.
    Get ComGetHeaderFieldAttribute Of hoPart2 "Content-Disposition" "filename" To sFilename
    Showln "Filename: " sFilename

    // Because the "filename" is so often accessed, it is also available
    // by accessing the "Filename" property:
    Get ComFilename Of hoPart2 To sTemp1
    Showln "Filename: " sTemp1

    // The disposition (without attributes) which in this case 
    // is the string "attachment" is accessed via the Disposition property:
    Get ComDisposition Of hoPart2 To sTemp1
    Showln "Disposition: " sTemp1

    // To get the full value of the Content-Disposition header field,
    // call GetHeaderField.
    Get ComGetHeaderField Of hoPart2 "Content-Disposition" To sTemp1
    Showln "Content-Disposition: " sTemp1

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

    // To get the "name", call GetHeaderFieldAttribute
    Get ComGetHeaderFieldAttribute Of hoPart2 "Content-Type" "name" To sName
    Showln "Content-Type name: " sName

    // Because the "name" is so often accessed, it is also available
    // by accessing the "Name" property:
    Get ComName Of hoPart2 To sTemp1
    Showln "Content-Type name: " sTemp1

    // The content-type without attributes is available in the
    // ContentType property:
    Get ComContentType Of hoPart2 To sTemp1
    Showln "Content-Type: " sTemp1

    // To get the full value of the Content-Type header field,
    // call GetHeaderField.
    Get ComGetHeaderField Of hoPart2 "Content-Type" To sTemp1
    Showln "Content-Type: " sTemp1

    // -------------------------------
    // 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:
    Get ComEncoding Of hoPart2 To sTemp1
    Showln "Content-Transfer-Encoding: " sTemp1
    Get ComGetHeaderField Of hoPart2 "Content-Transfer-Encoding" To sTemp1
    Showln "Content-Transfer-Encoding: " sTemp1

    Send Destroy of hoPart2

    Showln "Finished."


End_Procedure