B4X

Get IMAP Attachment Sizes

Demonstrates the Chilkat Imap.GetMailAttachSize method, which returns the size in bytes of an attachment. The first argument is the Email and the second is the zero-based attachment index. This example fetches headers only and prints each attachment's name and size.

Background: Like the attachment filename, the size comes from ckx-imap-* metadata and is available from a header-only fetch without downloading the body. A client can therefore show attachment sizes in a message preview, and decide whether to auto-download or prompt before pulling a large file.

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Dim success As Boolean = False

'  Demonstrates the Imap.GetMailAttachSize method, which returns the size in bytes of an
'  attachment.  The 1st argument is the Email and the 2nd is the zero-based attachment index.

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


'  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 Boolean = True
Dim useUid As Boolean = False
Dim seqNum As Int = 1
Dim email As ChilkatEmail
email.Initialize
success = imap.FetchEmail(headersOnly, seqNum, useUid, email)
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


Dim numAttach As Int = imap.GetMailNumAttach(email)
Dim i As Int
For i = 0 To numAttach - 1
    Dim fname As String = imap.GetMailAttachFilename(email, i)
    If imap.LastMethodSuccess = False Then
        Log(imap.LastErrorText)
        Return
    End If

    Dim sz As Int = imap.GetMailAttachSize(email, i)
    Log(fname & ": " & sz & " bytes")
Next

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