Moved to QSerialPort. Working now

Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.     QMainWindow(parent),
  3.     ui(new Ui::MainWindow), Serial(NULL)
  4. {
  5.     ui->setupUi(this);
  6.     connect(ui->ledBut, SIGNAL(clicked(bool)), this, SLOT(ledOnOff(bool)));
  7.     setup();
  8. }
  9.  
  10. MainWindow::~MainWindow()
  11. {
  12.     delete ui;
  13.     Serial->close();
  14.     delete Serial;
  15.     Serial = NULL;
  16. }
  17.  
  18. void MainWindow::ledOnOff(bool on)
  19. {
  20.     int write = -1;
  21.  
  22.     if(on)
  23.     {
  24.         write = 1;
  25.         ui->ledBut->setText("OFF");
  26.     }
  27.     else
  28.     {
  29.         write = 0;
  30.         ui->ledBut->setText("OFF");
  31.     }
  32.  
  33.     if(Serial->isOpen() ||  this->Serial->open(QIODevice::ReadWrite))
  34.     {
  35.         this->Serial->setBaudRate(QSerialPort::Baud9600);
  36.         this->Serial->setParity(QSerialPort::NoParity);
  37.         this->Serial->setStopBits(QSerialPort::OneStop);
  38.         this->Serial->setFlowControl(QSerialPort::NoFlowControl);
  39.         this->Serial->setDataBits(QSerialPort::Data8);
  40.  
  41.         QByteArray dayArray;
  42.         dayArray[0]= write;
  43.         qDebug() << "Written Bytes : " <<  this->Serial->write(dayArray);
  44.         this->Serial->waitForBytesWritten(-1);
  45.     }
  46.     else
  47.     {
  48.         qDebug() << "Failled open com port";
  49.     }
  50. }
  51.  
  52. void MainWindow::onReadyRead()
  53. {
  54.     QByteArray bytes;
  55.     int a =  Serial->bytesAvailable();
  56.     bytes.resize(a);
  57.     Serial->read(bytes.data(), bytes.size());
  58.     qDebug() << "bytes read:" << bytes.size() << "  Written data = " << bytes.data();
  59. }
  60.  
  61. void MainWindow::errorReport(QSerialPort::SerialPortError error)
  62. {
  63.  if(error!=0)
  64.      qDebug()<<"ERROR:"<<endl<<error;
  65. }
  66.  
  67. void MainWindow::setup()
  68. {
  69.     if(!Serial)
  70.     {
  71.         this->Serial=new QSerialPort(this);
  72.         this->Serial->setPortName("COM6");
  73.         this->Serial->setBaudRate(QSerialPort::Baud9600);
  74.         connect(this->Serial,SIGNAL(error(QSerialPort::SerialPortError)),this,SLOT(errorReport(QSerialPort::SerialPortError)));
  75.         connect(Serial, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
  76.     }
  77. }
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