(C++) Copy Email from one IMAP Account to Another

Demonstrates how to copy the email in a mailbox from one account to another.

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#include <CkImap.h>
#include <CkMessageSet.h>
#include <CkFileAccess.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    CkImap imapSrc;

    // This example assumes Chilkat Imap to have been previously unlocked.
    // See Unlock Imap for sample code.

    // Connect to our source IMAP server.
    imapSrc.put_Ssl(true);
    imapSrc.put_Port(993);
    bool success = imapSrc.Connect("MY-IMAP-DOMAIN");
    if (success != true) {
        std::cout << imapSrc.lastErrorText() << "\r\n";
        return;
    }

    // Login to the source IMAP server
    success = imapSrc.Login("MY-IMAP-LOGIN","MY-IMAP-PASSWORD");
    if (success != true) {
        std::cout << imapSrc.lastErrorText() << "\r\n";
        return;
    }

    CkImap imapDest;

    // Connect to our destination IMAP server.
    imapDest.put_Ssl(true);
    imapDest.put_Port(993);
    success = imapDest.Connect("MY-IMAP-DOMAIN2");
    if (success != true) {
        std::cout << imapDest.lastErrorText() << "\r\n";
        return;
    }

    // Login to the destination IMAP server
    success = imapDest.Login("MY-IMAP-LOGIN2","MY-IMAP-PASSWORD2");
    if (success != true) {
        std::cout << imapDest.lastErrorText() << "\r\n";
        return;
    }

    // Select a source IMAP mailbox on the source IMAP server
    success = imapSrc.SelectMailbox("Inbox");
    if (success != true) {
        std::cout << imapSrc.lastErrorText() << "\r\n";
        return;
    }

    bool fetchUids = true;

    // Get the set of UIDs for all emails on the source server.
    CkMessageSet *mset = imapSrc.Search("ALL",fetchUids);
    if (imapSrc.get_LastMethodSuccess() != true) {
        std::cout << imapSrc.lastErrorText() << "\r\n";
        return;
    }

    // Load the complete set of UIDs that were previously copied.
    // We dont' want to copy any of these to the destination.
    CkFileAccess fac;
    CkMessageSet msetAlreadyCopied;
    const char *strMsgSet = fac.readEntireTextFile("qa_cache/saAlreadyLoaded.txt","utf-8");
    if (fac.get_LastMethodSuccess() == true) {
        msetAlreadyCopied.FromCompactString(strMsgSet);
    }

    int numUids = mset->get_Count();
    CkStringBuilder sbFlags;

    int i = 0;
    while (i < numUids) {

        // If this UID was not already copied...
        int uid = mset->GetId(i);
        if (!msetAlreadyCopied.ContainsId(uid)) {

            std::cout << "copying " << uid << "..." << "\r\n";

            // Get the flags.
            const char *flags = imapSrc.fetchFlags(uid,true);
            if (imapSrc.get_LastMethodSuccess() == false) {
                std::cout << imapSrc.lastErrorText() << "\r\n";
                return;
            }

            sbFlags.SetString(flags);

            // Get the MIME of this email from the source.
            const char *mimeStr = imapSrc.fetchSingleAsMime(uid,true);
            if (imapSrc.get_LastMethodSuccess() == false) {
                std::cout << imapSrc.lastErrorText() << "\r\n";
                return;
            }

            bool seen = sbFlags.Contains("\\Seen",false);
            bool flagged = sbFlags.Contains("\\Flagged",false);
            bool answered = sbFlags.Contains("\\Answered",false);
            bool draft = sbFlags.Contains("\\Draft",false);

            success = imapDest.AppendMimeWithFlags("Inbox",mimeStr,seen,flagged,answered,draft);
            if (success != true) {
                std::cout << imapDest.lastErrorText() << "\r\n";
                return;
            }

            // Update msetAlreadyCopied with the uid just copied.
            msetAlreadyCopied.InsertId(uid);

            // Save at every iteration just in case there's a failure..
            strMsgSet = msetAlreadyCopied.toCompactString();
            fac.WriteEntireTextFile("qa_cache/saAlreadyLoaded.txt",strMsgSet,"utf-8",false);
        }

        i = i + 1;
    }

    delete mset;

    // Disconnect from the IMAP servers.
    success = imapSrc.Disconnect();
    success = imapDest.Disconnect();
    }