B4X
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.
Chilkat B4X Downloads

Download Chilkat for B4X
B4X
Dim success As Boolean = False

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

Dim mime As ChilkatMime
mime.Initialize

'  The contents of this MIME file are shown below, 
'  and is also available at https://www.chilkatsoft.com/sampleMime.txt
success = mime.LoadMimeFile("qa_data/mime/sampleMime.txt")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


'  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.
Log("Subject = " & mime.GetHeaderField("subject"))
Log("MIME-Version = " & mime.GetHeaderField("mime-version"))

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

Dim mpRelated As ChilkatMime
mpRelated.Initialize
success = mime.PartAt(1, mpRelated)
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


Dim pJpg As ChilkatMime
pJpg.Initialize
success = mpRelated.PartAt(1, pJpg)
If success = False Then
    Log(mpRelated.LastErrorText)
    Return
End If


Log("JPG Content-ID = " & pJpg.GetHeaderField("content-id"))
Log("JPG Content-Type = " & pJpg.GetHeaderField("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--
'