QT Udp socket

[Tibet]

QObject::connect: No such signal QUdpSocket::Read

I get an error.

MainWindow.h looks like this...........................................

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QUdpSocket>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
void Hello1();

signals:

public slots:

void Hello2();
void Read1();

private slots:
void on_pushButton_clicked();

private:
Ui::MainWindow *ui;
QUdpSocket *socket;

};
#endif // MAINWINDOW_H

MainWindow.cpp look like this.............................................

#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QDebug>
#include <QTimer>
#include <QLabel>
#include<iostream>

QTimer *timer = new QTimer();
static QUdpSocket *socket;

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);

socket = new QUdpSocket(this);
socket->bind(QHostAddress::LocalHost, 1234);
connect(socket, SIGNAL(Read1()), this, SLOT(Read1()));


timer = new QTimer(this);
connect(timer, SIGNAL(timeout()),this,SLOT(Hello2()));
timer -> start(1000);

// connect(timer, SIGNAL(timeout()),this,SLOT(Hello1()));
// timer -> start(1000);

ui -> pushButton -> setCheckable(true);

}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::Hello2()
{
qDebug() << "update..";
}

void MainWindow::Hello1()
{

QByteArray Data;
Data.append("Hello from UDP land");

// char Name[1000];
// std::cout << "Your message : ";
// std::cin >> Name;
// qDebug() << "Hello " << Name << "\n";

socket->writeDatagram(Data, QHostAddress::LocalHost, 1234);

}

void MainWindow::Read1()
{
QByteArray buffer;
buffer.resize(socket->pendingDatagramSize()); //bekleyen data miktarı

QHostAddress sender;
quint16 senderPort;

if ( socket->readDatagram(buffer.data(), buffer.size(),&sender,&senderPort) != -1)
{

qDebug() << "Message from: " << sender.toString();
qDebug() << "Message port: " << senderPort;
qDebug() << "Message: " << buffer;

} else {
;// handle error
}
}

void MainWindow::on_pushButton_clicked()
{

ui ->label->setText("1");

}

and main.cpp look like .......................

#include "MainWindow.h"
#include "MyUDP.h"

#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

MainWindow client;

client.Hello1();

MainWindow w;
w.show();
return a.exec();

}

[Christian Ehrlicher]

@Tibet said in QT Udp socket:

QObject::connect: No such signal QUdpSocket::Read

And that's correct - QUdpSocket has no such signal.

/edit: and please fix your post to use the code tags to make the code more readable!

[JonB]

@Tibet

QObject::connect: No such signal QUdpSocket::Read

Not only as @Christian-Ehrlicher says, but in addition tell us clearly which line you get this error on, and what the code of the line is? Because I don't see any call at all to QUdpSocket::Read anywhere in the code you show, so I don't even see how you could get that error message; if I didn't know better, I'd say you either have not copied & pasted the error message, or your code is not as shown....

[Tibet]

14:15:32: Starting /home/tibet/build-qtDeneme12-Desktop-Debug/qtDeneme12 ...
QObject::connect: No such signal QUdpSocket::Read1() in ../qtDeneme12/MainWindow.cpp:19
QObject::connect: (receiver name: 'MainWindow')
QObject::connect: No such signal QUdpSocket::Read1() in ../qtDeneme12/MainWindow.cpp:19
QObject::connect: (receiver name: 'MainWindow')

[Christian Ehrlicher]

@Tibet Again: there is no such signal in QUdpSocket!

[JonB]

@Tibet
So, as suspected, what you said was the error message never was the error message.... Please, if you post questions take the time to copy & paste the correct code and the correct error message, else people waste time trying to help you.

And again additional to @Christian-Ehrlicher .

I'm sorry, but if you have not already done so you really need to read Signals & Slots and have a proper understanding before you will get anywhere in Qt. Just trying things won't help you.

Also I strongly advise that you change over to the New Signal Slot Syntax before you go further. It will hep you by generating compiler messages when you have done something wrong.

[Tibet]

I'm very new at Qt. I guess the error might be about signal and slot. because ---- connect (socket, SIGNAL (Read1 ()), this, SLOT (Read1 ())); --- this part doesn't work. I don't know exactly about MyUDP.h

[Christian Ehrlicher]

@Tibet said in QT Udp socket:

connect (socket, SIGNAL (Read1 ()), this, SLOT (Read1 ())); --- this part doesn't work

And again: we know that it does not work because QUdpSocket has no such signal (said already two times before but you're ignoring it). The documentation has a working code snippet so why don't you follow them?

[JonB]

@Tibet

connect (socket, SIGNAL (Read1 ()), this, SLOT (Read1 ()));

Yes, it does not work. Because socket is a QUdpSocket, and as per that documentation page there is no such signal (or any method) as QUdpSocket::Read1. There is a signal QUdpSocket::readRead, and there is a method QUdpSocket::readDatagram() which you might want to call in a slot on that signal....

[Tibet]

@JonB thank u. I get it now <3. I used readyRead() and it was fixed.

[Pablo J. Rogina]

@Tibet said in QT Udp socket:

it was fixed.

so if your issue is solved now, please don't forget to mark your post as such!