B4X

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.

Chilkat B4X Downloads

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B4X

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 ChilkatImap
imap.Initialize("imap")

imap.Ssl = True
imap.Port = 993

success = imap.Connect("imap.example.com")
If success = False Then
    Log(imap.LastErrorText)
    Return
End If

success = imap.Login("user@example.com", "myPassword")
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


success = imap.SelectMailbox("Inbox")
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


'  Search for the message ids to download, returning UIDs.
Dim wantUids As Boolean = True
Dim msgSet As ChilkatMessageSet
msgSet.Initialize
success = imap.QueryMbx("ALL", wantUids, msgSet)
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


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

    '  Download the message's MIME into a StringBuilder.  The id is a UID.
    Dim useUid As Boolean = True
    Dim sbMime As ChilkatStringBuilder
    sbMime.Initialize
    success = imap.FetchSingleAsMimeSb(uid, useUid, sbMime)
    If success = False Then
        Log(imap.LastErrorText)
        Return
    End If

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


success = imap.Disconnect
If success = False Then
    Log(imap.LastErrorText)
    Return
End If