C++

Check the IMAP Socket Connection

Demonstrates the Chilkat Imap.CheckConnection method, which checks whether the underlying TCP socket is currently connected to the IMAP server. This performs a low-level socket-state check and does not send an IMAP command. This example connects and checks the socket.

Background: CheckConnection sits between the cached IsConnected and a full protocol round trip: it inspects the actual socket without sending an IMAP command, so it can catch a locally-closed socket that the cached flag would miss. It still cannot detect every half-open connection, though — only a real command like Noop that expects a server reply proves the session is genuinely alive end to end.

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C++

#include <CkImap.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the Imap.CheckConnection method, which checks whether the underlying TCP
    //  socket is currently connected to the IMAP server.  This is a low-level socket-state check
    //  and does not send an IMAP command.

    CkImap imap;

    imap.put_Ssl(true);
    imap.put_Port(993);

    success = imap.Connect("imap.example.com");
    if (success == false) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    //  Perform a low-level check of the socket connection state.
    bool stillConnected = imap.CheckConnection();
    if (stillConnected == true) {
        std::cout << "The socket is still connected." << "\r\n";
    }
    else {
        std::cout << "The socket is no longer connected." << "\r\n";
    }

    success = imap.Disconnect();
    if (success == false) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }
    }