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Thread: QextSerialPort writeData/readData

  1. 24th January 2010, 13:28 #1
    another_one
    another_one is offline Beginner
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    Question QextSerialPort writeData/readData

    Hello!

    I need some support in the following situation:

    I'm trying to use QextSerialPort Class in communication between PC and Device application.

    The question is in about read/write operations.

    what I have done:

    Header:
    Qt Code: 
    1. #include <QMainWindow>
    2. #include "qextserialport.h"
    3.  
    4.  
    5. namespace Ui {
    6.     class CAN_transfer;
    7.  
    8. }
    9.  
    10. class CAN_transfer : public QMainWindow {
    11.     Q_OBJECT
    12.  
    13. public:
    14.     CAN_transfer(QWidget *parent = 0);
    15.     ~CAN_transfer();
    16.  
    17. protected:
    18.     void changeEvent(QEvent *e);
    19.  
    20. private:
    21.     Ui::CAN_transfer *ui;
    22.     QextSerialPort*  _comPort;
    23.     unsigned char mas[64];
    24.     unsigned char* DATA_pointer;
    25.  
    26. private slots:
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    source:

    Qt Code: 
    1. #include "can_transfer.h"
    2. #include "ui_can_transfer.h"
    3. #include "qextserialport.h"
    4. #include "win_qextserialport.h"
    5.  
    6.  
    7. CAN_transfer::CAN_transfer(QWidget *parent) :
    8.     QMainWindow(parent),
    9.     ui(new Ui::CAN_transfer)
    10. {
    11.     ui->setupUi(this);
    12.     ui->logw->setReadOnly(true);
    13.     ui->logw->setTextColor(Qt::red);
    14.     ui->logw->append(tr("before using this software be sure to set connection between Device and PC via COM1 port"));
    15.     ui->logw->setTextColor(Qt::black);
    16.     ui->spinBox_1->setMaximum(8);
    17.     ui->spinBox_2->setMaximum(8);
    18.     ui->spinBox_3->setMaximum(8);
    19.     ui->spinBox_4->setMaximum(8);
    20.     ui->spinBox_5->setMaximum(8);
    21.     ui->spinBox_6->setMaximum(8);
    22.     ui->spinBox_7->setMaximum(8);
    23.     ui->spinBox_8->setMaximum(8);
    24.     QString s="COM1";
    25.     _comPort  = new QextSerialPort(s);
    26.     DATA_pointer = &mas[0];
    27. }
    28.  
    29. CAN_transfer::~CAN_transfer()
    30. {
    31.  
    32.     delete(_comPort);
    33.     delete ui;
    34. }
    35.  
    36. void CAN_transfer::changeEvent(QEvent *e)
    37. {
    38.     QMainWindow::changeEvent(e);
    39.     switch (e->type()) {
    40.     case QEvent::LanguageChange:
    41.         ui->retranslateUi(this);
    42.         break;
    43.     default:
    44.         break;
    45.     }
    46. }
    47.  
    48.  
    49.  
    50. void CAN_transfer::on_connectbutton_clicked()
    51. {
    52.     ui->logw->append(tr("COM1 configurating...."));
    53.     _comPort->setBaudRate(BAUD9600);
    54.     _comPort->setFlowControl(FLOW_OFF);
    55.     _comPort->setParity(PAR_NONE);
    56.     _comPort->setDataBits(DATA_8);
    57.     _comPort->setStopBits(STOP_1);
    58.     _comPort->open(QIODevice::ReadWrite | QIODevice::Unbuffered);
    59.     ui->logw->append(tr("conneting...."));
    60.     /*
    61.     *DATA_pointer = 0x55;
    62.     DATA_pointer++;
    63.     *DATA_pointer = 0xAA;
    64.     DATA_pointer++;
    65.     *DATA_pointer = 0xFF;
    66.     DATA_pointer -2;
    67.     *DATA_pointer = 0;
    68.     
    69.  
    70.     if(_comPort->writeData(DATA_pointer, 3))
    71.     {
    72.         while(!(readData(DATA_pointer,1)));
    73.         if(*DATA_pointer==0x55)
    74.         ui->logw->append(tr("connection established!"));
    75.         statusBar()->showMessage(tr("Connected"));
    76.     }
    77.  
    78.   */
    79.     _comPort->close();
    80. }
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    commented code in source is a reason of many errors, which are:

    can_transfer.cpp: In member function 'void CAN_transfer:n_connectbutton_clicked()':
    can_transfer.cpp:71: warning: statement has no effect
    can_transfer.cpp:75: error: invalid conversion from 'int' to 'unsigned char*'
    can_transfer.cpp:80: warning: statement has no effect
    win_qextserialport.h:47: error: 'virtual qint64 Win_QextSerialPort::writeData(const char*, qint64)' is protected
    can_transfer.cpp:84: error: within this context
    can_transfer.cpp:84: error: invalid conversion from 'unsigned char*' to 'const char*'
    can_transfer.cpp:84: error: initializing argument 1 of 'virtual qint64 Win_QextSerialPort::writeData(const char*, qint64)'
    can_transfer.cpp:86: error: 'readData' was not declared in this scope


    Hope somebody helps in eliminating of this errors.


    Thanks in advance
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  2. 28th January 2010, 00:06 #2
    waynew's Avatar
    waynew
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    Default Re: QextSerialPort writeData/readData

    I have no experience with QextSerialPort, but QSerialDevice works fine with my application, built as a static library.
    You might try it.
    Good luck with your code.
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  3. 28th January 2010, 11:09 #3
    another_one
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    Default Re: QextSerialPort writeData/readData

    Thank you for your supporting.

    Luckily, I solved this problem with help from knowing people.

    Now it looks like that:

    Qt Code: 
    1. #include "can_transfer.h"
    2. #include "ui_can_transfer.h"
    3. #include "qextserialport.h"
    4. #include "win_qextserialport.h"
    5.  
    6.  
    7. CAN_transfer::CAN_transfer(QWidget *parent) :
    8.     QMainWindow(parent),
    9.     ui(new Ui::CAN_transfer)
    10. {
    11.     ui->setupUi(this);
    12.     ui->logw->setReadOnly(true);
    13.     ui->logw->setTextColor(Qt::red);
    14.     ui->logw->append(tr("before using this software be sure to set connection between Device and PC via COM1 port"));
    15.     ui->logw->setTextColor(Qt::black);
    16.     ui->spinBox_1->setMaximum(8);
    17.     ui->spinBox_2->setMaximum(8);
    18.     ui->spinBox_3->setMaximum(8);
    19.     ui->spinBox_4->setMaximum(8);
    20.     ui->spinBox_5->setMaximum(8);
    21.     ui->spinBox_6->setMaximum(8);
    22.     ui->spinBox_7->setMaximum(8);
    23.     ui->spinBox_8->setMaximum(8);
    24.     QString s="COM1";
    25.     _comPort  = new QextSerialPort(s);
    26.     _comPort->setBaudRate(BAUD9600);
    27.     _comPort->setFlowControl(FLOW_OFF);
    28.     _comPort->setParity(PAR_NONE);
    29.     _comPort->setDataBits(DATA_8);
    30.     _comPort->setStopBits(STOP_1);
    31.     DATA_pointer = &mas[0];
    32. }
    33.  
    34. CAN_transfer::~CAN_transfer()
    35. {
    36.     _comPort->close();
    37.     delete(_comPort);
    38.     delete ui;
    39. }
    40.  
    41. void CAN_transfer::changeEvent(QEvent *e)
    42. {
    43.     QMainWindow::changeEvent(e);
    44.     switch (e->type()) {
    45.     case QEvent::LanguageChange:
    46.         ui->retranslateUi(this);
    47.         break;
    48.     default:
    49.         break;
    50.     }
    51. }
    52. void CAN_transfer::on_connectbutton_clicked()
    53. {
    54.     ui->logw->append(tr("COM1 configurating...."));
    55.     _comPort->open(QIODevice::ReadWrite | QIODevice::Unbuffered);
    56.     ui->logw->append(tr("conneting...."));
    57.     *DATA_pointer = 0x55;
    58.     DATA_pointer++;
    59.     *DATA_pointer = 0xAA;
    60.     DATA_pointer++;
    61.     *DATA_pointer = 0xFF;
    62.     DATA_pointer -= 2;
    63.     if(_comPort->write((const char*)DATA_pointer, 3))
    64.     {
    65.         while(!(_comPort->read((char*)DATA_pointer,1)));
    66.         if(*DATA_pointer==0x55)
    67.         ui->logw->append(tr("connection established!"));
    68.     }
    69.     statusBar()->showMessage(tr("Connected"));
    70.     _comPort->close();
    71. }
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