QT no such slot with Q_Object

[Hystreal]

Hi everyone,

I have some issue on Qt 5.5, when i want to add a slot to my class :

QObject::connect: No such slot plugin_test::startCompteur()
QObject::connect: (sender name: 'startButton')
QObject::connect: (receiver name: 'plugin_test')

---

#ifndef PLUGIN_TEST_H
#define PLUGIN_TEST_H

#include <QDialog>

namespace Ui {
class plugin_test;
}

class plugin_test : public QDialog
{
Q_OBJECT

public:
explicit plugin_test(QWidget *parent = 0);
~plugin_test();

private:
Ui::plugin_test *ui;

private slots :

void startCompteur();

};
#endif // PLUGIN_TEST_H

#include "plugin_test.h"
#include "ui_plugin_test.h"

#include "capture_file.h"

#include <config.h>

#include "cfile.h"
#include "file.h"
#include "fileset.h"

plugin_test::plugin_test(QWidget *parent) :
QDialog(parent),
ui(new Ui::plugin_test)
{

ui->setupUi(this);
connect(ui->startButton, SIGNAL(clicked()), this, SLOT(startCompteur()));

}

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

void plugin_test::startCompteur()
{
//here my code
}

thanks for your help

[SGaist]

Hi and welcome to devnet,

Pretty strange, did you do anything beside adding the slot to your class ?

[hskoglund]

Hmm just guessing, perhaps some name collision with the Wireshark include files?
Try some other name than startCompteur()...

[Hystreal]

SGaist :

I'm working on wireshark source code and i've just add a new class with one slot.

hskoglund :

I already tried with another name like test_slot that i'm pretty sur there is no similar name but still doesn't work.

[mrjj]

@Hystreal said:

And its not because its private and you hook it up in Dialog ?
maybe try with new syntax ?
connect(sender, &Sender::valueChanged, receiver, &Receiver::updateValue );

since it gives better warnings/more type strict.

[Hystreal]

Did you mean this synthax without SIGNAL and SLOT ?

connect(ui->startButton, &sender::pressed(), this, &receivers::startCompteur());

or

connect(ui->startButton, SIGNAL(&sender::pressed()), this, SLOT(&receivers::startCompteur()));

or maybe i've not totally understood...

Anyways these synthaxes still doesn't work

[jsulm]

@Hystreal

connect(ui->startButton, &sender::pressed(), this, &receivers::startCompteur()); is wrong, it should be:
connect(ui->startButton, &sender::pressed, this, &receivers::startCompteur);

[Hystreal]

OK, i tried and now i have the followings errors :

erreur : C2653: 'sender' : is not a class or namespace name
erreur : C2065: 'pressed' : undeclared identifier
erreur : C2653: 'receivers' : is not a class or namespace name
erreur : C2276: '&' : illegal operation on bound member function expression

[jsulm]

@Hystreal That's because you are doing it completely wrong, it should be (don't know what the class is where startCompteur is, change it accordingly):

connect(ui->startButton, &QPushButton::pressed, this, &Receiver::startCompteur);

[Hystreal]

Ok sorry , it works now ! thanks you very much !