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# dialog.h Example File
network/loopback/dialog.h

        #ifndef DIALOG_H
        #define DIALOG_H

        #include <QDialog>
        #include <QTcpServer>
        #include <QTcpSocket>

        class QLabel;
        class QProgressBar;
        class QPushButton;
        class QTcpServer;
        class QTcpSocket;

        class Dialog : public QDialog
        {
            Q_OBJECT

        public:
            Dialog(QWidget *parent = 0);

        public slots:
            void start();
            void acceptConnection();
            void startTransfer();
            void updateServerProgress();
            void updateClientProgress(qint64 numBytes);
            void displayError(QTcpSocket::SocketError socketError);

        private:
            QProgressBar *clientProgressBar;
            QProgressBar *serverProgressBar;
            QLabel *clientStatusLabel;
            QLabel *serverStatusLabel;
            QPushButton *startButton;
            QPushButton *quitButton;

            QTcpServer tcpServer;
            QTcpSocket tcpClient;
            QTcpSocket *tcpServerConnection;
            int bytesToWrite;
            int bytesWritten;
            int bytesReceived;
        };

        #endif