(MFC) Download POP3 Email using UIDLs

Demonstrates how to download POP3 email by first getting the complete set of UIDLs and then downloading email by calling FetchEmail for each UIDL. This is equivalent to calling CopyMail, except your application can process each email as it arrives instead of waiting for the entire bundle to be downloaded. Also, it's better protection against potential out-of-memory issues if your mailbox has a very large number of messages. There is no performance difference between fetching emails individually vs. calling CopyMail.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkMailMan.h>
#include <CkStringArray.h>
#include <CkEmail.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // 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("myLogin");
    mailman.put_PopPassword("myPassword");

    CkStringArray *sa = mailman.GetUidls();
    if (mailman.get_LastMethodSuccess() != true) {
        strOut.append(mailman.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    int i = 0;
    int n = sa->get_Count();

    const char *uidl = 0;

    while (i < n) {

        uidl = sa->getString(i);

        CkEmail *email = mailman.FetchEmail(uidl);
        if (mailman.get_LastMethodSuccess() != true) {
            strOut.append(mailman.lastErrorText());
            strOut.append("\r\n");
            delete sa;
            SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
            return;
        }

        strOut.append("From: ");
        strOut.append(email->ck_from());
        strOut.append("\r\n");
        strOut.append("Subject: ");
        strOut.append(email->subject());
        strOut.append("\r\n");
        delete email;

        i = i + 1;
    }

    delete sa;

    mailman.Pop3EndSession();


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }