Вот основной код:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
imapSocket = new QTcpSocket(this);
imapSocket->connectToHost(QHostAddress("127.0.0.1"), 143);
connect(imapSocket, SIGNAL(readyRead()), SLOT(readMessage()));
}
MainWindow::~MainWindow()
{
delete ui;
imapSocket->close();
}
void MainWindow::on_ok_clicked()
{
qDebug() << imapSocket->state();
if(ui->send->text().isEmpty()) return;
QByteArray data = ui->send->text().toAscii();
imapSocket->write(data);
ui->send->clear();
}
void MainWindow::readMessage()
{
QByteArray datagram;
datagram = imapSocket->readAll();
QString ans(datagram);
ui->answer->append(ans);
}