QSerialDevice Problem

[waynew]

This is probably due to my total inexperience with libraries.
Trying to include QSerialDevice as a static library.
Generated the library file libqserialdevice.a and put it in my project directory.
Added to my .pro

INCLUDEPATH += C:\cpp\qt_projects\qtlogger\include
LIBS += -L"C:\cpp\qt_projects\qtlogger\"  -llibqserialdevice.a

INCLUDEPATH += C:\cpp\qt_projects\qtlogger\include
LIBS += -L"C:\cpp\qt_projects\qtlogger\"  -llibqserialdevice.a

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Builds ok, but doesn't look like the .exe file got any bigger. That worried me.
Then create a class to use the library functions in - SerialComm

Adding to SerialComm:

class AbstractSerial; // from the library

Causes build error: forward declaration of 'struct AbstractSerial'

Obviously not the right way. So what is?

[kuzulis]

1. What function SerialComm?
2. What operating system?
3. And what do you want to do? (more detail the essence of the problem)

PS: try to use the library from SVN:
http://fireforge.net/snapshots.php?group_id=199

PPS: to LIBS in my opinion you need to insert the library name without extension, ie instead -llibqserialdevice.a need to write -lqserialdevice

[waynew]

Thanks for your reply Kuzulis. I have changed the pro file as you suggested and built the library from the svn. Same build problem.
The SerialComm class was added to my project as a place to put the serial read and write methods - a place to call the library functions from.
I just need to be able to read and write to a serial port on Win, *nix, or MAC OS.
I have included the initial code below - just copied your writer as a starting point.
OS is XP/SP3

INCLUDEPATH += C:\cpp\qt_projects\qtlogger\qserialdevice\src
LIBS += -L"C:\cpp\qt_projects\qtlogger\qserialdevice\src\release"
LIBS += -llibqserialdevice

INCLUDEPATH += C:\cpp\qt_projects\qtlogger\qserialdevice\src
LIBS += -L"C:\cpp\qt_projects\qtlogger\qserialdevice\src\release"
LIBS += -llibqserialdevice

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#ifndef SERIALCOMM_H
#define SERIALCOMM_H
 
#include <QObject>
#include <QByteArray>
 
#include "abstractserial.h"
#include "abstractserialengine.h"
#include "datatypes.h"
#include "nativeserialengine.h"
#include "winserialnotifier.h"
 
class SerialComm : public QObject
{
Q_OBJECT
public:
    explicit SerialComm(QObject *parent = 0);
    void printDataToHex(const QByteArray &data);
    void writeComm(QByteArray);
 
signals:
 
public slots:
 
};
 
#endif // SERIALCOMM_H

#ifndef SERIALCOMM_H
#define SERIALCOMM_H

#include <QObject>
#include <QByteArray>

#include "abstractserial.h"
#include "abstractserialengine.h"
#include "datatypes.h"
#include "nativeserialengine.h"
#include "winserialnotifier.h"

class SerialComm : public QObject
{
Q_OBJECT
public:
    explicit SerialComm(QObject *parent = 0);
    void printDataToHex(const QByteArray &data);
    void writeComm(QByteArray);

signals:

public slots:

};

#endif // SERIALCOMM_H

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#include "serialcomm.h"
#include <iostream>
#include <QString>
#include <QDebug>
#include <QByteArray>
 
#include "abstractserial.h"
#include "abstractserialengine.h"
#include "datatypes.h"
#include "nativeserialengine.h"
#include "winserialnotifier.h"
 
SerialComm::SerialComm(QObject *parent) :
    QObject(parent)
{
}
 
void SerialComm::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) {
      qDebug() << "[" << baTmp.at(i) << baTmp.at(i+1) << "]";
   }
}
 
void SerialComm::writeComm(QByteArray ba) {
   AbstractSerial *MyDevice = new AbstractSerial();
 
      //cout << "Please enter serial device name, specific by OS : ";
      //char dn[50];
      //cin >> dn;
      QString dn = "COM3";
      MyDevice->setDeviceName(dn);
 
   /*!
    \warning
    \~english To annex "correctly" to work - need to open the device with the flag Unbuffered!
    \~russian Чтобы приложение "корректно" работало - необходимо открывать устройство с флагом Unbuffered!
   */
      if (MyDevice->open(QIODevice::WriteOnly | QIODevice::Unbuffered)) {
         qDebug() << "Serial device " << MyDevice->deviceName() << " open in " << MyDevice->openMode();
   /*
         MyDevice->setDataBits(AbstractSerial::DataBits6);
         MyDevice->setParity(AbstractSerial::ParityMark);
   */
         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;
         qint64 bw=0;
         while (1) {
            qDebug() << "Please enter count bytes for wtitten : ";
            bw=0;
            //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);
            qDebug() << "Writed is : " << bw << " bytes";
            qDebug() << "Tx : ";
            printDataToHex(ba);
         }
      }
      else {
         qDebug() << "Error opened serial device " << MyDevice->deviceName();
      }
      MyDevice->close();
      qDebug() << "Serial device " << MyDevice->deviceName() << " is closed";
      delete MyDevice;
      MyDevice=0;
}

#include "serialcomm.h"
#include <iostream>
#include <QString>
#include <QDebug>
#include <QByteArray>

#include "abstractserial.h"
#include "abstractserialengine.h"
#include "datatypes.h"
#include "nativeserialengine.h"
#include "winserialnotifier.h"

SerialComm::SerialComm(QObject *parent) :
    QObject(parent)
{
}

void SerialComm::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) {
      qDebug() << "[" << baTmp.at(i) << baTmp.at(i+1) << "]";
   }
}

void SerialComm::writeComm(QByteArray ba) {
   AbstractSerial *MyDevice = new AbstractSerial();

      //cout << "Please enter serial device name, specific by OS : ";
      //char dn[50];
      //cin >> dn;
      QString dn = "COM3";
      MyDevice->setDeviceName(dn);

   /*!
    \warning
    \~english To annex "correctly" to work - need to open the device with the flag Unbuffered!
    \~russian Чтобы приложение "корректно" работало - необходимо открывать устройство с флагом Unbuffered!
   */
      if (MyDevice->open(QIODevice::WriteOnly | QIODevice::Unbuffered)) {
         qDebug() << "Serial device " << MyDevice->deviceName() << " open in " << MyDevice->openMode();
   /*
         MyDevice->setDataBits(AbstractSerial::DataBits6);
         MyDevice->setParity(AbstractSerial::ParityMark);
   */
         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;
         qint64 bw=0;
         while (1) {
            qDebug() << "Please enter count bytes for wtitten : ";
            bw=0;
            //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);
            qDebug() << "Writed is : " << bw << " bytes";
            qDebug() << "Tx : ";
            printDataToHex(ba);
         }
      }
      else {
         qDebug() << "Error opened serial device " << MyDevice->deviceName();
      }
      MyDevice->close();
      qDebug() << "Serial device " << MyDevice->deviceName() << " is closed";
      delete MyDevice;
      MyDevice=0;
}

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The library headers are visible from my gui application now, but it still won't build.
Just returns: :-1: error: collect2: ld returned 1 exit status

No clue as to why it won't build. Any ideas?

[kuzulis]

I looked at your example and say the following:
1. You have in your code is # include "datatypes.h". However, the SVN is no longer the file datatypes.h and therefore it is not necessary.
2. Just plug the only # include "abstractserial.h" (see examples in / examples)
3. Show your project file *. pro, because instead of LIBS + =-llibqserialdevice to write LIBS + =-lqserialdevice

PS: but the main idea - that you downloaded, try to compile the examples from the directory examples without changing them. If writer, reader, or sreader will bring together - then you're in your project properly connect the library

[waynew]

Thanks Kuzulis, builds ok now.
I'll let you know how it goes.

[drizzt]

hi,

i'm want to use QSerialDevice. (examples working fine). So i copied some code from examples to my project. I want to read data from serial port and write incoming data to a QTextField.
not a big thing, but my application always freeze after few seconds

had anyone the same problem and solved it?

[kuzulis]

1. If the amount of data is small, then they can be read using the signal readyRead() (see the example /examples/sreader)
2. If a large amount of data - then use the thread

[kuzulis]

1. If the amount of data is small, then they can be read using the signal [b] readyRead() [/ b] (see the example /examples/sreader)
2. If a large amount of data - then use the thread

[drizzt]

very fast answer thx

i'll try and tell you if it runs or not...


edit:
now i can start my app 2 times and send messages over serial port thx