Fetch a Text IMAP Attachment into a StringBuilder

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Demonstrates the Chilkat Imap.FetchAttachmentSb method, which decodes one text attachment into a StringBuilder. The first argument is the Email, the second is the zero-based attachment index, the third is the charset used to decode the bytes, and the fourth is the StringBuilder, which is cleared first. This example decodes the first attachment as UTF-8.

Dim success As Long
success = 0

'  Demonstrates the Imap.FetchAttachmentSb method, which downloads one text attachment and
'  decodes it into a StringBuilder.  The 1st argument is the Email, the 2nd is the zero-based
'  attachment index, the 3rd is the charset used to decode, and the 4th is the StringBuilder
'  (cleared first).
'  
'  The message is fetched headers-only, then the attachment is downloaded on demand.

Dim imap As New ChilkatImap

imap.Ssl = 1
imap.Port = 993

success = imap.Connect("imap.example.com")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

success = imap.Login("user@example.com","myPassword")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

success = imap.SelectMailbox("Inbox")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

'  Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
'  metadata describing the attachments is present, so the attachment info methods still work.
Dim headersOnly As Long
headersOnly = 1
Dim useUid As Long
useUid = 0
Dim seqNum As Long
seqNum = 1
Dim email As New ChilkatEmail
success = imap.FetchEmail(headersOnly,seqNum,useUid,email)
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

Dim numAttach As Long
numAttach = imap.GetMailNumAttach(email)
If (numAttach > 0) Then
    '  Download the first (text) attachment and decode it as UTF-8.  Use this only for text.
    Dim sb As New ChilkatStringBuilder
    success = imap.FetchAttachmentSb(email,0,"utf-8",sb)
    If (success = 0) Then
        Debug.Print imap.LastErrorText
        Exit Sub
    End If

    Dim attachText As String
    attachText = sb.GetAsString()
    Debug.Print attachText
End If

success = imap.Disconnect()
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If