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VB.NET UWP/WinRT Examples


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(VB.NET UWP/WinRT) Fetch Full Email Given Email Header

When email headers are fetched using UIDs (not sequence numbers), then the resultant email object (containing only the header) will include auto-generated ckx-imap-* header fields to record information about the uid, attachments, etc. The IMAP UID of the email will be available in the "ckx-imap-uid" header. There will also be a "ckx-imap-isUid" header field having the value "YES" or "NO". If the email header was downloaded by UID, then "ckx-imap-isUID" will contain the value "YES" and the value of the "ckx-imap-uid" header field is the IMAP UID. If the "ckx-imap-isUID" header has a value of "NO", then the "ckx-imap-uid" header field represents the sequence number. (Sequence numbers of emails on the server can change over time, depending on whether emails are deleted. UIDs must be used to ensure that the correct full email is downloaded.)

The Chilkat Email object provides a GetImapUid method to return the UID from the ckx-imap-uid header. This can then be used to download the full email using the FetchSingle method. Assuming the UID is known, download a single email by UID from an IMAP mail server.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

Dim imap As New Chilkat.Imap

Dim success As Boolean

'  Anything unlocks the component and begins a fully-functional 30-day trial.
success = imap.UnlockComponent("Anything for 30-day trial")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Connect to an IMAP server.
'  Use TLS
imap.Ssl = True
imap.Port = 993
success = Await imap.ConnectAsync("imap.someMailServer.com")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Login
success = Await imap.LoginAsync("***","***")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Select an IMAP mailbox
success = Await imap.SelectMailboxAsync("Inbox")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


Dim emailHeader As Chilkat.Email
Dim emailFull As Chilkat.Email

Dim uid As Integer = 2014
Dim isUid As Boolean = True

'  Fetch only the email header
emailHeader = Await imap.FetchSingleHeaderAsync(uid,isUid)
If (Not (emailHeader Is Nothing )) Then

    '  Now fetch the full email
    Dim uidFromCkxHeader As Integer = emailHeader.GetImapUid()
    If (uidFromCkxHeader < 0) Then
        '  Failed.

        Debug.WriteLine("No ckx-imap-uid header was found.")
        Exit Sub
    End If

    emailFull = Await imap.FetchSingleAsync(uidFromCkxHeader,True)
    If (Not (emailFull Is Nothing )) Then

        '  OK, we have the full email, do whatever we want...


    End If



End If


'  Disconnect from the IMAP server.
success = Await imap.DisconnectAsync()

 

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