(Unicode C) IMAP STARTTLS (Explicit TLS/SSL)

The StartTls property is set to force the Connect method to automatically convert an connection to TLS/SSL via the STARTTLS IMAP command.

This is also known as "explicit TLS/SSL" as opposed to "implicit TLS/SSL". With implicit TLS/SSL, the IMAP client connects on the well-known IMAP TLS/SSL port 993 and the secure channel is immediately established. With explicit TLS/SSL, the IMAP client connects on the typical non-secure port (143 usually) and the converts the connection via the STARTTLS command.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat C/C++ Library Downloads
MS Visual C/C++ C++ Builder Linux C/C++ Alpine Linux C/C++	MacOS C/C++ iOS C/C++ Android C/C++ MinGW C/C++

#include <C_CkImapW.h>
#include <C_CkMessageSetW.h>
#include <C_CkEmailBundleW.h>
#include <C_CkEmailW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkImapW imap;
    BOOL fetchUids;
    HCkMessageSetW messageSet;
    HCkEmailBundleW bundle;
    BOOL headersOnly;
    HCkEmailW email;
    int i;
    int numEmails;

    success = FALSE;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    imap = CkImapW_Create();

    // Indicate that STARTTLS should be used to convert
    // to a secure TLS/SSL connection:
    CkImapW_putStartTls(imap,TRUE);
    CkImapW_putPort(imap,143);

    // Connect to an IMAP server and convert the connection
    // to TLS/SSL via STARTTLS.
    success = CkImapW_Connect(imap,L"imap.example.com");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // The remainder of this example is the same as for 
    // non-TLS/SSL...

    // Login
    success = CkImapW_Login(imap,L"myLogin",L"myPassword");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Select an IMAP mailbox
    success = CkImapW_SelectMailbox(imap,L"Inbox");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Get the message IDs of all the emails in the mailbox
    fetchUids = TRUE;
    messageSet = CkMessageSetW_Create();
    success = CkImapW_QueryMbx(imap,L"ALL",fetchUids,messageSet);
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        CkMessageSetW_Dispose(messageSet);
        return;
    }

    // Fetch the emails into a bundle object:
    bundle = CkEmailBundleW_Create();
    headersOnly = FALSE;
    success = CkImapW_FetchMsgSet(imap,headersOnly,messageSet,bundle);
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        CkMessageSetW_Dispose(messageSet);
        CkEmailBundleW_Dispose(bundle);
        return;
    }

    // Loop over the bundle and display the FROM and SUBJECT of each.
    email = CkEmailW_Create();
    i = 0;
    numEmails = CkEmailBundleW_getMessageCount(bundle);
    while (i < numEmails) {
        CkEmailBundleW_EmailAt(bundle,i,email);

        wprintf(L"%s\n",CkEmailW_ck_from(email));
        wprintf(L"%s\n",CkEmailW_subject(email));
        wprintf(L"--\n");
        i = i + 1;
    }

    // Disconnect from the IMAP server.
    success = CkImapW_Disconnect(imap);


    CkImapW_Dispose(imap);
    CkMessageSetW_Dispose(messageSet);
    CkEmailBundleW_Dispose(bundle);
    CkEmailW_Dispose(email);

    }