AutoIt

Set a MIME Header Field

Demonstrates the Chilkat Mime.SetHeaderField method, which sets a single header field. The first argument is the field name and the second is the value. All existing occurrences are removed and one replacement is inserted, or a new field is added if none exists.

Background: For headers that should appear exactly once — Subject, From, Content-Type — this is the method to use, because it guarantees a single occurrence no matter how many times you call it. That idempotence is the key difference from AddHeaderField, which would leave duplicates behind. Setting an empty value removes the field.

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Local $bSuccess = False

;  Demonstrates the Mime.SetHeaderField method, which sets a single header field.  The 1st argument
;  is the field name and the 2nd is the value.  All existing occurrences are removed and one
;  replacement is inserted (or a new field is added if none exists).

$oMime = ObjCreate("Chilkat.Mime")

$bSuccess = $oMime.SetBodyFromPlainText("Hello.")
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

;  Unlike AddHeaderField, SetHeaderField ensures exactly one field with this name.
$bSuccess = $oMime.SetHeaderField("Subject","Weekly Report")
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

;  Setting it again replaces the previous value rather than adding a duplicate.
$bSuccess = $oMime.SetHeaderField("Subject","Weekly Report (revised)")
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

Local $subject = $oMime.GetHeaderField("Subject")
If ($oMime.LastMethodSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Subject: " & $subject & @CRLF)