Classic ASP

Enumerate MIME Header Field Names

Demonstrates the Chilkat Mime.GetHeaderFieldName method, which returns the name of the header-field occurrence at a zero-based index. The only argument is the index; use NumHeaderFields for the count. Original order and casing are preserved.

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: When you need to walk all the headers — to display them, copy them, or handle duplicates that GetHeaderField would hide — index-based access is the way. NumHeaderFields bounds the loop, and this returns each field's name in its original order and casing, which matters when the exact header sequence is significant.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

set mime = Server.CreateObject("Chilkat.Mime")
success = mime.LoadMimeFile("qa_data/message.eml")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

'  Iterate the header fields by index.  NumHeaderFields gives the count; GetHeaderFieldName and
'  GetHeaderFieldValue return the name and value at each zero-based index.  Original order and
'  casing are preserved.
n = mime.NumHeaderFields
Response.Write "<pre>" & Server.HTMLEncode( "Header fields: " & n) & "</pre>"

For i = 0 To n - 1
    fieldName = mime.GetHeaderFieldName(i)
    If (mime.LastMethodSuccess = 0) Then
        Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
        Response.End
    End If

    Response.Write "<pre>" & Server.HTMLEncode( fieldName) & "</pre>"
Next

%>
</body>
</html>