(PowerBuilder) 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

integer li_rc
oleobject loo_Mime
integer li_Success
oleobject loo_Part2
string ls_Filename
string ls_Name

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

loo_Mime = create oleobject
// Use "Chilkat_9_5_0.Mime" for versions of Chilkat < 10.0.0
li_rc = loo_Mime.ConnectToNewObject("Chilkat.Mime")
if li_rc < 0 then
    destroy loo_Mime
    MessageBox("Error","Connecting to COM object failed")
    return
end if

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

li_Success = loo_Mime.LoadMimeFile("sampleMime2.txt")
if li_Success = 0 then
    Write-Debug loo_Mime.LastErrorText
    destroy loo_Mime
    return
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.

loo_Part2 = loo_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.
ls_Filename = loo_Part2.GetHeaderFieldAttribute("Content-Disposition","filename")
Write-Debug "Filename: " + ls_Filename

// Because the "filename" is so often accessed, it is also available
// by accessing the "Filename" property:
Write-Debug "Filename: " + loo_Part2.Filename

// The disposition (without attributes) which in this case 
// is the string "attachment" is accessed via the Disposition property:
Write-Debug "Disposition: " + loo_Part2.Disposition

// To get the full value of the Content-Disposition header field,
// call GetHeaderField.
Write-Debug "Content-Disposition: " + loo_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
ls_Name = loo_Part2.GetHeaderFieldAttribute("Content-Type","name")
Write-Debug "Content-Type name: " + ls_Name

// Because the "name" is so often accessed, it is also available
// by accessing the "Name" property:
Write-Debug "Content-Type name: " + loo_Part2.Name

// The content-type without attributes is available in the
// ContentType property:
Write-Debug "Content-Type: " + loo_Part2.ContentType

// To get the full value of the Content-Type header field,
// call GetHeaderField.
Write-Debug "Content-Type: " + loo_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:
Write-Debug "Content-Transfer-Encoding: " + loo_Part2.Encoding
Write-Debug "Content-Transfer-Encoding: " + loo_Part2.GetHeaderField("Content-Transfer-Encoding")

destroy loo_Part2

Write-Debug "Finished."


destroy loo_Mime