(VB.NET) List Yahoo Mail IMAP Mailboxes

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' 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

' Connect to the Yahoo IMAP server.
success = imap.Connect("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 = imap.Login("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 = imap.ListMailboxes(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

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