(VB.NET UWP/WinRT) Examine Yahoo Mail IMAP Session Log

See more Yahoo Mail Examples

To examine the IMAP session log, set the KeepSessionLog property = True, and then examine the contents of the SessionLog property.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' See Get Yahoo Mail OAuth2 Access Token for Desktop App 
' for sample code showing how to obtain a Yahoo Mail access token.

' In this example, our access token was previously saved to the following file which contains JSON like this:
' {
'   "access_token": "kCVQdnOdul...LHucA--",
'   "refresh_token": "AIenVXETSo0jklFBVkPS8vVm8E.Ej9ToRG.xDbDYmZ65WIs5t6CZhDrD",
'   "expires_in": 3600,
'   "token_type": "bearer",
'   "xoauth_yahoo_guid": "HGDQCVF5JB4YDOWHITQJFBHCWA"
' }

Dim json As New Chilkat.JsonObject
Dim success As Boolean = json.LoadFile("qa_data/tokens/yahooMail.json")
If (success <> True) Then
    Debug.WriteLine("Failed to load Yahoo Mail access token file.")
    Exit Sub
End If

Dim accessToken As String = json.StringOf("access_token")

' Do OAuth2 authentication by using the access token as the password in the Login method below...
Dim imap As New Chilkat.Imap

imap.Ssl = True
imap.Port = 993

' Tell Chilkat IMAP to keep a session log.
imap.KeepSessionLog = True

' Connect to the Yahoo IMAP server.
success = Await imap.ConnectAsync("imap.mail.yahoo.com")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Indicate that XOAUTH2 authentication is to be used:
imap.AuthMethod = "XOAUTH2"

' Login
' Use the email address of the Yahoo Mail account that granted authorization.
success = Await imap.LoginAsync("user@yahoo.com",accessToken)
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
Else
    Debug.WriteLine("Successfully authenticated with Yahoo IMAP using XOAUTH2!")
End If



' The ListMailboxes method returns a Mailboxes object
' that contains the collection of mailboxes.
' It accepts two arguments: a refName and a wildcardedMailbox.

Dim refName As String = ""
' refName is usually set to an empty string.
' A non-empty reference name argument is the name of a mailbox or a level of
' mailbox hierarchy, and indicates the context in which the mailbox
' name is interpreted.

' Select all mailboxes matching this pattern:
Dim wildcardedMailbox As String = "*"

Dim mboxes As Chilkat.Mailboxes = Await imap.ListMailboxesAsync(refName,wildcardedMailbox)
If (imap.LastMethodSuccess = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


Dim i As Integer = 0
While i < mboxes.Count
    Debug.WriteLine(mboxes.GetName(i))
    i = i + 1
End While

' Sample output looks like this:

' Archive
' Bulk Mail
' Draft
' Inbox
' Inbox/emailsWithAttach
' Inbox/test
' Sent
' Trash

' Examine the session log
Debug.WriteLine(imap.SessionLog)

' Sample session log

' ----INFO----
' Connecting to IMAP server at imap.mail.yahoo.com:993
' ----IMAP RESPONSE----
' * OK [CAPABILITY IMAP4rev1 SASL-IR AUTH=PLAIN AUTH=XOAUTH2 AUTH=OAUTHBEARER ID MOVE NAMESPACE XYMHIGHESTMODSEQ UIDPLUS LITERAL+ CHILDREN X-MSG-EXT OBJECTID] IMAP4rev1 Hello
' ----IMAP REQUEST----
' aaab AUTHENTICATE XOAUTH2 
' ----IMAP RESPONSE----
' aaab OK AUTHENTICATE completed
' ----IMAP REQUEST----
' aaac LIST "" "*"
' ----IMAP RESPONSE----
' * LIST (\Archive \HasNoChildren) "/" "Archive"
' * LIST (\Junk \HasNoChildren) "/" "Bulk Mail"
' * LIST (\Drafts \HasNoChildren) "/" "Draft"
' * LIST (\HasChildren) "/" "Inbox"
' * LIST (\HasNoChildren) "/" "Inbox/emailsWithAttach"
' * LIST (\HasNoChildren) "/" "Inbox/test"
' * LIST (\Sent \HasNoChildren) "/" "Sent"
' * LIST (\Trash \HasNoChildren) "/" "Trash"
' aaac OK LIST completed


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