C++

Download the Full Version of a Partial Email

Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

Background: A common pattern is to download headers first — cheap and fast — show the user a message list, and only pull the full content when a message is actually opened. FetchFull completes that "download on demand" flow: given a partial email (which carries its UIDL), it fetches the rest from the server. This keeps bandwidth and latency low when browsing a large mailbox.

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C++

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

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
    //  header-only or partial Email and stores it in a second Email.  The full result includes
    //  the complete body and any attachments.  The partial email must retain its UIDL.

    CkMailMan mailman;

    //  Configure the POP3 server connection.
    mailman.put_MailHost("pop.example.com");
    mailman.put_MailPort(995);
    mailman.put_PopSsl(true);
    mailman.put_PopUsername("user@example.com");
    mailman.put_PopPassword("myPassword");

    //  First fetch message 1 as headers only (a fast preview).  headerOnly=true.
    CkEmail partialEmail;

    success = mailman.FetchOne(true,0,1,partialEmail);
    if (success == false) {
        std::cout << mailman.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Preview subject: " << partialEmail.subject() << "\r\n";

    //  Now download the complete message (body and attachments).
    CkEmail fullEmail;
    success = mailman.FetchFull(partialEmail,fullEmail);
    if (success == false) {
        std::cout << mailman.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Full email NumAttachments: " << fullEmail.get_NumAttachments() << "\r\n";

    //  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
    //  connects and authenticates -- using the property settings above -- whenever a server
    //  operation requires it.  Calling the explicit connect/authenticate methods can still be
    //  helpful to determine whether a failure occurs while connecting or while authenticating.
    }