loopback.py 文件源码

def start(self):
        self.startButton.setEnabled(False)

        QApplication.setOverrideCursor(Qt.WaitCursor)

        self.bytesWritten = 0
        self.bytesReceived = 0

        while not self.tcpServer.isListening() and not self.tcpServer.listen():
            ret = QMessageBox.critical(self, "Loopback",
                    "Unable to start the test: %s." % self.tcpServer.errorString(),
                    QMessageBox.Retry | QMessageBox.Cancel)
            if ret == QMessageBox.Cancel:
                return

        self.serverStatusLabel.setText("Listening")
        self.clientStatusLabel.setText("Connecting")

        self.tcpClient.connectToHost(QHostAddress(QHostAddress.LocalHost), self.tcpServer.serverPort())