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dialog.h Example File
^{network/loopback/dialog.h}

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    #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(QAbstractSocket::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