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(Xojo Plugin) Reading Unread POP3 EmailThe POP3 protocol does not provide the ability to ask the server which emails are "unread". Furthermore, a pure POP3 server does not even keep this information. Some servers, such as Exchange Server, expose both POP3 and IMAP interfaces. In these cases, information about read/unread status exists on the server, but it is only available via the IMAP protocol. Email clients such as Outlook and Thunderbird keep read/unread information on the client computer. This example demonstrates how UIDLs can be saved to track and read "unread" email.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The mailman object is used for receiving (POP3) // and sending (SMTP) email. Dim mailman As New Chilkat.MailMan // Set the POP3 server's hostname mailman.MailHost = "pop.someMailServer.com" // Set the POP3 login/password. mailman.PopUsername = "***" mailman.PopPassword = "***" // You may keep a list of already-seen UIDLs in a text file: // If this is the first time you're running this example, // create an empty text file named "seenUidls.txt" Dim saSeenUidls As New Chilkat.StringArray Dim success As Boolean success = saSeenUidls.LoadFromFile("seenUidls.txt") If (success <> True) Then System.DebugLog("failed to load seenUidls.txt") Return End If // Get the complete list of UIDLs on the mail server. Dim saUidls As Chilkat.StringArray saUidls = mailman.GetUidls() If (mailman.LastMethodSuccess = False) Then System.DebugLog(mailman.LastErrorText) Return End If // Create a new string array object (it's an object, not an actual array) // and add the UIDLs from saUidls that aren't already seen. Dim saUnseenUidls As New Chilkat.StringArray Dim i As Int32 i = 0 Dim n As Int32 n = saUidls.Count While i < n If (saSeenUidls.Contains(saUidls.GetString(i)) <> True) Then success = saUnseenUidls.Append(saUidls.GetString(i)) End If i = i + 1 Wend If (saUnseenUidls.Count = 0) Then System.DebugLog("No unseen emails!") Return End If // Download in full the unseen emails: Dim bundle As Chilkat.EmailBundle bundle = mailman.FetchMultiple(saUnseenUidls) If (mailman.LastMethodSuccess = False) Then System.DebugLog(mailman.LastErrorText) Return End If Dim email As Chilkat.Email i = 0 While i < bundle.MessageCount email = bundle.GetEmail(i) System.DebugLog(email.From) System.DebugLog(email.Subject) System.DebugLog("----") i = i + 1 Wend // Save saUidls to "seenUidls.txt" success = saUidls.SaveToFile("seenUidls.txt") |
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