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(C++) 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.
#include <CkMailMan.h> #include <CkStringArray.h> #include <CkEmailBundle.h> #include <CkEmail.h> void ChilkatSample(void) { // 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. CkMailMan mailman; // Set the POP3 server's hostname mailman.put_MailHost("pop.someMailServer.com"); // Set the POP3 login/password. mailman.put_PopUsername("***"); mailman.put_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" CkStringArray saSeenUidls; bool success = saSeenUidls.LoadFromFile("seenUidls.txt"); if (success != true) { std::cout << "failed to load seenUidls.txt" << "\r\n"; return; } // Get the complete list of UIDLs on the mail server. CkStringArray *saUidls = mailman.GetUidls(); if (mailman.get_LastMethodSuccess() == false) { std::cout << mailman.lastErrorText() << "\r\n"; return; } // 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. CkStringArray saUnseenUidls; int i = 0; int n = saUidls->get_Count(); while (i < n) { if (saSeenUidls.Contains(saUidls->getString(i)) != true) { success = saUnseenUidls.Append(saUidls->getString(i)); } i = i + 1; } if (saUnseenUidls.get_Count() == 0) { std::cout << "No unseen emails!" << "\r\n"; delete saUidls; return; } // Download in full the unseen emails: CkEmailBundle *bundle = mailman.FetchMultiple(saUnseenUidls); if (mailman.get_LastMethodSuccess() == false) { std::cout << mailman.lastErrorText() << "\r\n"; delete saUidls; return; } CkEmail *email = 0; i = 0; while (i < bundle->get_MessageCount()) { email = bundle->GetEmail(i); std::cout << email->ck_from() << "\r\n"; std::cout << email->subject() << "\r\n"; std::cout << "----" << "\r\n"; delete email; i = i + 1; } // Save saUidls to "seenUidls.txt" success = saUidls->SaveToFile("seenUidls.txt"); delete saUidls; } |
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