QUpdSocket The program has unexpectedly finished.

[anda_skoa]

Where does the writing application instantiate the QTimer that it used in initSocket()?

Cheers,
_

[ariad]

header to write

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QUdpSocket>
#include <QByteArray>
#include <QTimer>
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void initSocket();
 
public slots:
    void sendDatagram();
 
private:
    Ui::MainWindow *ui;
    QUdpSocket *udpSocket;
    QTimer *timer;
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QUdpSocket>
#include <QByteArray>
#include <QTimer>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void initSocket();

public slots:
    void sendDatagram();

private:
    Ui::MainWindow *ui;
    QUdpSocket *udpSocket;
    QTimer *timer;
};

#endif // MAINWINDOW_H

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header to read

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QUdpSocket>
#include <QByteArray>
#include <QTimer>
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void initSocket();
 
public slots:
    void sendDatagram();
 
private:
    Ui::MainWindow *ui;
    QUdpSocket *udpSocket;
    QTimer *timer;
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QUdpSocket>
#include <QByteArray>
#include <QTimer>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void initSocket();

public slots:
    void sendDatagram();

private:
    Ui::MainWindow *ui;
    QUdpSocket *udpSocket;
    QTimer *timer;
};

#endif // MAINWINDOW_H

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thanks,

[anda_skoa]

nice, but that does not answer the question.
Again: where do you create the QTimer instance?

Cheers,
_

[ariad]

That's all!

[anda_skoa]

What I was trying to hit at is that you need to create an instance of QTimer if you want to use it
Right now you are using an uninitialized pointer.

Cheers,
_

[ariad]

Thanks!!!! I can send and receive!!!


Now I have the next problem, but why I can't do this?

ui->label_2->setText(datagram.at(i).toString());

ui->label_2->setText(datagram.at(i).toString());

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Build:
Request for member 'toString' in 'datagram.QByteArray::at(i), which is of non-class type char
ui->label_2->setText(datagram.at(i).toString());

Thanks another time!!

[anda_skoa]

QByteArray::at() returns a char, a single character. It is not a class and does not have any methods.

If you want to display the string inside the byte array, use one of the QString::fromXYZ methods, e.g. QString::fromAscii()

Cheers,
_

[ariad]

Ok, thanks!!!