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Add, Remove, Update MIME Header Fields

Demonstrates how to add, remove, or update the content of MIME header fields.
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Local $bSuccess = False

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

$oMime = ObjCreate("Chilkat.Mime")

;  The contents of this MIME file are shown below, 
;  and is also available at https://www.chilkatsoft.com/sampleMime.txt
$bSuccess = $oMime.LoadMimeFile("qa_data/mime/sampleMime.txt")
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

;  The MIME used in this example has the following nested structure
;  
;  multipart/alternative
;      text/plain
;      multipart/related
;          text/html
;          image/jpeg
;  

;  Adding a top-level MIME header is easy.
$oMime.AddHeaderField("hello-world","Hello World!")
;  If a header field of the same name already exists, the AddHeaderField
;  method adds a duplicate.
$oMime.AddHeaderField("Subject","This is the 2nd Subject header.")
ConsoleWrite($oMime.GetEntireHead() & @CRLF)
ConsoleWrite("-" & @CRLF)

;  The top-level header now looks like this:
;  
;  	Subject: Test email.
;  	Content-Type: multipart/alternative; boundary="------------DB171738719FB06D67DEBAA0"
;  	MIME-Version: 1.0
;  	hello-world: Hello World!
;  	Subject: This is the 2nd Subject header.
;  

;  The RemoveHeaderField method can remove the 1st occurrance, or all occurrences.
Local $bAllOccurrences = True
;  Remove all occurrences of the Subject header;
$oMime.RemoveHeaderField "Subject",$bAllOccurrences
ConsoleWrite($oMime.GetEntireHead() & @CRLF)
ConsoleWrite("-" & @CRLF)

;  After removing all Subject header fields, the top-level header now looks like this:
;  
;  Content-Type: multipart/alternative; boundary="------------DB171738719FB06D67DEBAA0"
;  MIME-Version: 1.0
;  hello-world: Hello World!
;  

;  The content of a header field can be updated by calling SetHeaderField.
;  If the header field does not already exist, it is added.  Otherwise it is updated.
;  Note: The order of header fields SHOULD never matter.
$oMime.SetHeaderField("hello-world","Goodbye World.")
ConsoleWrite($oMime.GetEntireHead() & @CRLF)
ConsoleWrite("-" & @CRLF)

;  Now we have:
;  
;  	Content-Type: multipart/alternative; boundary="------------DB171738719FB06D67DEBAA0"
;  	MIME-Version: 1.0
;  	hello-world: Goodbye World.
;  

;  To add/update/delete header fields in sub-parts, navigate to
;  the sub-part and do the same..

$oMpRelated = ObjCreate("Chilkat.Mime")
$oMime.PartAt(1,$oMpRelated)

$oPJpg = ObjCreate("Chilkat.Mime")
$oMpRelated.PartAt(1,$oPJpg)

;  Add a header to the image/jpeg sub-header.
$oPJpg.SetHeaderField("CustomHeader","This is the custom header value.")

;  View the entire MIME..
ConsoleWrite($oMime.GetMime() & @CRLF)

;  --------------------------------------------------------------
;  --------------------------------------------------------------
;  The MIME sample file loaded at the beginning of this example
;  contains the following MIME:

;  Subject: Test email.
;  Content-Type: multipart/alternative;
;  	boundary="------------DB171738719FB06D67DEBAA0"
;  MIME-Version: 1.0
;  
;  --------------DB171738719FB06D67DEBAA0
;  Content-Type: text/plain; charset="utf-8"; format=flowed
;  Content-Transfer-Encoding: 7bit
;  
;  This is a test.
;  
;  --------------DB171738719FB06D67DEBAA0
;  Content-Type: multipart/related;
;  	boundary="------------A940F1230E6F0105F03DB2CB"
;  
;  --------------A940F1230E6F0105F03DB2CB
;  Content-Type: text/html; charset="utf-8"
;  Content-Transfer-Encoding: 8bit
;  
;  <html><head>
;  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
;    </head>
;    <body bgcolor="#FFFFFF" text="#000000">
;      <p>This is a test.&nbsp; <img src="cid:part1.E16AE3B4.1505C436@chilkatsoft.com" height="20" width="20"></p>
;    </body>
;  </html>
;  
;  --------------A940F1230E6F0105F03DB2CB
;  Content-Type: image/jpeg; name="starfish20.jpg"
;  Content-Transfer-Encoding: base64
;  Content-ID: <part1.E16AE3B4.1505C436@chilkatsoft.com>
;  Content-Disposition: inline; filename="starfish20.jpg"
;  
;  /9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
;  NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
;  YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
;  Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
;  AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
;  NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
;  pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
;  Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
;  enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
;  xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
;  DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
;  AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
;  QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
;  EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==
;  
;  --------------A940F1230E6F0105F03DB2CB--
;  
;  --------------DB171738719FB06D67DEBAA0--
;