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(Xojo Plugin) Reading Unread POP3 EmailThe POP3 protocol cannot determine which emails are "unread," and pure POP3 servers do not store this information. Servers like Exchange Server, offering both POP3 and IMAP interfaces, do contain read/unread data, but it's only accessible through IMAP. Email clients like Outlook and Thunderbird store read/unread statuses on the client side. The example demonstrates using UIDLs to track and manage "unread" emails. Note: This example requires Chilkat v11.0.0 or greater.
Dim success As Boolean success = False // 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.example.com" // Set the POP3 login/password. mailman.PopUsername = "***" mailman.PopPassword = "***" // Keep a records of already-seen UIDLs in hash table serialized to an XML file. Dim seenUidlsPath As String seenUidlsPath = "c:/temp/seenUidls.xml" Dim sbXml As New Chilkat.StringBuilder Dim htSeenUidls As New Chilkat.Hashtable Dim fac As New Chilkat.FileAccess If (fac.FileExists(seenUidlsPath) = True) Then success = sbXml.LoadFile(seenUidlsPath,"utf-8") If (success = False) Then System.DebugLog(sbXml.LastErrorText) Return End If success = htSeenUidls.AddFromXmlSb(sbXml) End If // Get the complete list of UIDLs on the mail server. Dim stUidls As New Chilkat.StringTable success = mailman.FetchUidls(stUidls) If (success = False) Then System.DebugLog(mailman.LastErrorText) Return End If // Build a list of unseen UIDLs Dim stUnseenUidls As New Chilkat.StringTable Dim uidl As String Dim i As Int32 i = 0 Dim count As Int32 count = stUidls.Count While i < count uidl = stUidls.StringAt(i) If (htSeenUidls.Contains(uidl) <> True) Then success = stUnseenUidls.Append(uidl) End If i = i + 1 Wend If (stUnseenUidls.Count = 0) Then System.DebugLog("No unseen emails!") Return End If // Download the unseen emails, adding each UIDL to the "seen" hash table. Dim email As New Chilkat.Email count = stUnseenUidls.Count i = 0 While i < count // Download the full email. uidl = stUnseenUidls.StringAt(i) success = mailman.FetchByUidl(uidl,False,0,email) If (success = False) Then System.DebugLog(mailman.LastErrorText) Return End If System.DebugLog(Str(i)) System.DebugLog("From: " + email.From) System.DebugLog("Subject: " + email.Subject) // Add this UIDL to the "seen" hash table. success = htSeenUidls.AddStr(uidl,"") i = i + 1 Wend success = mailman.Pop3EndSession() // Update the "seen" UIDLs file. sbXml.Clear success = htSeenUidls.ToXmlSb(sbXml) success = sbXml.WriteFile(seenUidlsPath,"utf-8",False) If (success = False) Then System.DebugLog(sbXml.LastErrorText) Return End If System.DebugLog("Success.") |
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