[Qt-interest] Serial Communication

[Yuvraj]

Hi All

Just i am executing writing function code of Serial communication. It is 
asking to enter the device name , if enter the device name nothing is 
happening

sample code here

/* Writer
*
* This application is part of the examples on the use of the library 
QSerialDevice.
*
* writer - a test console application to write data to the port
*
* Copyright (C) 2009 Denis Shienkov
*
* Contact Denis Shienkov:
* e-mail: <scapig2 at yandex.ru>
* ICQ: 321789831
*/

#include <QtCore>
#include <abstractserial.h>
#include <iostream>

using namespace std;

static void printDataToHex(const QByteArray &data)
{
QByteArray baTmp;
baTmp.clear();
#if QT_VERSION >= 0x040300
baTmp = (data.toHex()).toUpper();
#else
quint8 n=0;
for (int i=0;i<data.size();i++) {
n=data.at(i);
if ((n >= 0) && (n <= 15)) baTmp.append(QByteArray::number(0, 
16).toUpper());
baTmp.append(QByteArray::number(n, 16).toUpper());
}
#endif

for (int i=0;i<baTmp.size();i+=2) {
cout << "[" << baTmp.at(i) << baTmp.at(i + 1) << "]";
}
cout << endl;
}

int main(int argc, char *argv[])
{
QCoreApplication app(argc, argv);

AbstractSerial *MyDevice = new AbstractSerial();

if (!MyDevice) {
qDebug() << "Create object is fail!";
return 0;
}

char dn[50]; //device name
cout << "Please enter serial device name, specific by OS : ";
cin >> dn;

MyDevice->setDeviceName(dn);

/*!
\warning
\~english To annex "correctly" to work - need to open the device with 
the flag Unbuffered!
\~russian ????? ?????????? "?????????" ???????? - ?????????? ????????? 
?????????? ? ?????? Unbuffered!
*/
if (MyDevice->open(QIODevice::WriteOnly | QIODevice::Unbuffered)) {

if (!MyDevice->setBaudRate(AbstractSerial::BaudRate115200)) {
qDebug() << "Set baud rate " << AbstractSerial::BaudRate115200 << " error.";
return 0;
};

qDebug() << "Serial device " << MyDevice->deviceName() << " open in " << 
MyDevice->openMode();

qDebug() << "= Defaults parameters =";
qDebug() << "Device name : " << MyDevice->deviceName();
qDebug() << "Baud rate : " << MyDevice->baudRate();
qDebug() << "Data bits : " << MyDevice->dataBits();
qDebug() << "Parity : " << MyDevice->parity();
qDebug() << "Stop bits : " << MyDevice->stopBits();
qDebug() << "Flow : " << MyDevice->flowControl();
qDebug() << "Char timeout, msec : " << MyDevice->charIntervalTimeout();

QByteArray ba; //data to send
qint64 bw = 0; //bytes really writed

while (1) {
bw = 0;
cout << "Please enter count bytes for wtitten : ";
cin >> bw;

qDebug() << "Starting writting " << bw << " bytes in time : " << 
QTime::currentTime();

ba.clear();
ba.resize(bw);
for (int i=0;i<bw;i++) { //filling data array
ba[i] = i;
}
bw = MyDevice->write(ba);

if (bw > 0) {
cout << "Tx : \n";
printDataToHex(ba);
}
qDebug() << "\n Writed is : " << bw << " bytes";
}//
}
else {
qDebug() << "Error opened serial device " << MyDevice->deviceName();
}
MyDevice->close();
qDebug() << "Serial device " << MyDevice->deviceName() << " is closed";
delete MyDevice;
MyDevice = 0;
return app.exec();
}


Regards

Yuvraj