(Visual FoxPro) Add, Remove, Update MIME Header Fields

Demonstrates how to add, remove, or update the content of MIME header fields.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loMime
LOCAL lnSuccess
LOCAL lnBAllOccurrences
LOCAL loMpRelated
LOCAL loPJpg

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

loMime = CreateObject('Chilkat_9_5_0.Mime')

* The contents of this MIME file are shown below, 
* and is also available at https://www.chilkatsoft.com/sampleMime.txt
lnSuccess = loMime.LoadMimeFile("qa_data/mime/sampleMime.txt")
IF (lnSuccess <> 1) THEN
    ? loMime.LastErrorText
    RELEASE loMime
    CANCEL
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.
loMime.AddHeaderField("hello-world","Hello World!")
* If a header field of the same name already exists, the AddHeaderField
* method adds a duplicate.
loMime.AddHeaderField("Subject","This is the 2nd Subject header.")
? loMime.GetEntireHead()
? "-"

* 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.
lnBAllOccurrences = 1
* Remove all occurrences of the Subject header;
loMime.RemoveHeaderField("Subject",lnBAllOccurrences)
? loMime.GetEntireHead()
? "-"

* 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.
loMime.SetHeaderField("hello-world","Goodbye World.")
? loMime.GetEntireHead()
? "-"

* 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..

loMpRelated = loMime.GetPart(1)
loPJpg = loMpRelated.GetPart(1)

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

RELEASE loPJpg
RELEASE loMpRelated

* View the entire MIME..
? loMime.GetMime()

* --------------------------------------------------------------
* --------------------------------------------------------------
* 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--
* 

RELEASE loMime