B4X

Get a MIME Header Field Attribute

Demonstrates the Chilkat Mime.GetHeaderFieldAttribute method, which returns an attribute value parsed from a header field. The first argument is the header field name and the second is the attribute name. Surrounding quotes are removed.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Many MIME headers pack extra parameters after the main value — Content-Type: multipart/mixed; boundary="xyz" or Content-Disposition: attachment; filename="report.pdf". This method extracts one of those named attributes directly, saving you from parsing the header string yourself and correctly stripping quotes and handling encoded values.

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Dim success As Boolean = False

Dim mime As ChilkatMime
mime.Initialize
success = mime.LoadMimeFile("qa_data/message.eml")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


'  Return an attribute value parsed from a header field.  The 1st argument is the header field
'  name and the 2nd is the attribute name.  For example, the "boundary" attribute of the
'  Content-Type header, or the "filename" attribute of Content-Disposition.
Dim boundary As String = mime.GetHeaderFieldAttribute("Content-Type", "boundary")
If mime.LastMethodSuccess = False Then
    Log(mime.LastErrorText)
    Return
End If

Log("Content-Type boundary: " & boundary)