Hi, I am trying to send 1/0 to my ARDUINO Board & trying to receive some data from board as a response , I am using QextSerialPort for this But I am not able to write any data to the board & not able to receive any data also.

http://docs.qextserialport.googlecode.com/git/1.2/qextserialport.html

qDebug() << "send.size() : " << send.size() << " data = " << send.data() <<" Written = " << port->write(send, send.size());
This printing : send.size() : 1 data = 1 Written = 0 //Means I am writing 0 bytes every time

Is there a problem in my code ??


Qt Code: 
  1. void MainWindow::ledOnOff(bool on)
  2. {
  3.     if(port == 0)
  4.     {
  5.         port = new QextSerialPort("COM6", QextSerialPort::EventDriven);     //QextSerialPort* port  is class member 
  6.         port->setBaudRate(BAUD9600);
  7.         port->setFlowControl(FLOW_OFF);
  8.         port->setParity(PAR_NONE);
  9.         port->setDataBits(DATA_8);
  10.         port->setStopBits(STOP_2);
  11.  
  12.         connect(port, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
  13.  
  14.         if(port->open(QIODevice::ReadWrite) == true)
  15.         {
  16.             qDebug() << "Port open success";
  17.         }
  18.         else
  19.         {
  20.             qDebug() << "Port open success";
  21.         }
  22.     }
  23.     else
  24.     {
  25.         port->close();
  26.     }
  27.  
  28.     quint8 writeByte = 0;
  29.  
  30.     if(on)
  31.     {
  32.         writeByte = 1;
  33.     }
  34.  
  35.     if(port->isOpen() || port->open(QIODevice::ReadWrite) == true)
  36.     {
  37.         QByteArray send;
  38.         send.resize(writeByte );
  39.         send = QByteArray::number(writeByte);
  40.  
  41.         port->flush();
  42.         qDebug() << "send.size() : " << send.size() << "  data = " << send.data()
  43.                  <<"  Writtend = " <<  port->write(send, send.size());
  44.     }
  45.     else
  46.     {
  47.         qDebug() << "device failed to open:" << port->errorString();
  48.     }
  49. }
  50.  
  51.  
  52. void MainWindow::onReadyRead()
  53. {
  54.     QByteArray bytes;
  55.     quint8 a = port->bytesAvailable();
  56.     bytes.resize(a);
  57.     port->read(bytes.data(), bytes.size());
  58.  
  59.     qDebug() <<  bytes.constData();
  60. }
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Thanks In Advance.