PureBasic
Get the Value of a MIME Header Field

Demonstrates how to get the value of a MIME header field. If the header field is not in the top-level MIME header, we must first navigate to the correct MIME part.
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PureBasic
IncludeFile "CkMime.pb"

Procedure ChilkatExample()

    success.i = 0

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

    mime.i = CkMime::ckCreate()
    If mime.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; The contents of this MIME file are shown below, 
    ; and is also available at https://www.chilkatsoft.com/sampleMime.txt
    success = CkMime::ckLoadMimeFile(mime,"qa_data/mime/sampleMime.txt")
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        ProcedureReturn
    EndIf

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

    ; Getting the content of a top-level MIME header is easy.
    ; MIME header fields are case insensitive.
    Debug "Subject = " + CkMime::ckGetHeaderField(mime,"subject")
    Debug "MIME-Version = " + CkMime::ckGetHeaderField(mime,"mime-version")

    ; To get a MIME header in a sub-part, first navigate to it..

    mpRelated.i = CkMime::ckCreate()
    If mpRelated.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkMime::ckPartAt(mime,1,mpRelated)
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        CkMime::ckDispose(mpRelated)
        ProcedureReturn
    EndIf

    pJpg.i = CkMime::ckCreate()
    If pJpg.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkMime::ckPartAt(mpRelated,1,pJpg)
    If success = 0
        Debug CkMime::ckLastErrorText(mpRelated)
        CkMime::ckDispose(mime)
        CkMime::ckDispose(mpRelated)
        CkMime::ckDispose(pJpg)
        ProcedureReturn
    EndIf

    Debug "JPG Content-ID = " + CkMime::ckGetHeaderField(pJpg,"content-id")
    Debug "JPG Content-Type = " + CkMime::ckGetHeaderField(pJpg,"content-type")

    ; --------------------------------------------------------------
    ; --------------------------------------------------------------
    ; 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--
    ; 


    CkMime::ckDispose(mime)
    CkMime::ckDispose(mpRelated)
    CkMime::ckDispose(pJpg)


    ProcedureReturn
EndProcedure