VB.NET

Fetch a Single Message's MIME into a StringBuilder

Demonstrates the Chilkat Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a StringBuilder. The first argument is the message id, the second (bUid) selects UID vs sequence number, and the third is the StringBuilder, which is cleared first. This example downloads a message by UID and prints the MIME length.

Background: Chilkat interprets the received MIME as UTF-8. Messages using Base64 or quoted-printable transfer encoding are safe because their encoded bytes are ASCII. Raw 8bit or binary content, or unencoded text in a charset such as ISO-8859-1 or Shift_JIS, can be misinterpreted — in those cases use FetchSingleBd to get the exact bytes.

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VB.NET

Dim success As Boolean = False

'  Demonstrates the Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a
'  StringBuilder.  The 1st argument is the message id, the 2nd (bUid) selects UID vs sequence
'  number, and the 3rd is the StringBuilder (cleared first).

Dim imap As New Chilkat.Imap

imap.Ssl = True
imap.Port = 993

success = imap.Connect("imap.example.com")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If

success = imap.Login("user@example.com","myPassword")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


success = imap.SelectMailbox("Inbox")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Search for the message ids to download, returning UIDs.
Dim wantUids As Boolean = True
Dim msgSet As New Chilkat.MessageSet
success = imap.QueryMbx("ALL",wantUids,msgSet)
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


If (msgSet.Count > 0) Then
    Dim uid As UInt32 = msgSet.GetId(0)

    '  Download the message's MIME into a StringBuilder.  The id is a UID.
    Dim useUid As Boolean = True
    Dim sbMime As New Chilkat.StringBuilder
    success = imap.FetchSingleAsMimeSb(uid,useUid,sbMime)
    If (success = False) Then
        Debug.WriteLine(imap.LastErrorText)
        Exit Sub
    End If

    Debug.WriteLine("MIME length: " & sbMime.Length & " chars")
End If


success = imap.Disconnect()
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If