Why I see: Object::connect: No such slot QDialog::showName(QString) in

[8Observer8]

Hi,

Why I see: Object::connect: No such slot QDialog::showName(QString) in ../DialogByButton/mainwindow.cpp:29

DialogByButton.pro

SOURCES += \
    main.cpp \
    mainwindow.cpp \
    dialog.cpp
 
HEADERS += \
    mainwindow.h \
    dialog.h

SOURCES += \
    main.cpp \
    mainwindow.cpp \
    dialog.cpp

HEADERS += \
    mainwindow.h \
    dialog.h

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dialog.h

#ifndef DIALOG_H
#define DIALOG_H
 
#include <QDialog>
#include <QtGui>
 
class Dialog : public QDialog
{
    Q_OBJECT
public:
    explicit Dialog(QWidget *parent = 0);
 
signals:
 
public slots:
    void showName(QString name);
 
private:
    QLabel *lblName;
};
 
#endif // DIALOG_H

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QtGui>

class Dialog : public QDialog
{
    Q_OBJECT
public:
    explicit Dialog(QWidget *parent = 0);
    
signals:
    
public slots:
    void showName(QString name);

private:
    QLabel *lblName;
};

#endif // DIALOG_H

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dialog.cpp

#include "dialog.h"
 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent)
{
    // Controls
    lblName = new QLabel(tr("Hahah"));
 
    // Layouts
    QHBoxLayout* mainLayout = new QHBoxLayout(this);
    mainLayout->addWidget(lblName);
 
    // Set Layout
    this->setLayout(mainLayout);
}
 
void Dialog::showName(QString name) {
    //lblName->setText(name);
}

#include "dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent)
{
    // Controls
    lblName = new QLabel(tr("Hahah"));

    // Layouts
    QHBoxLayout* mainLayout = new QHBoxLayout(this);
    mainLayout->addWidget(lblName);

    // Set Layout
    this->setLayout(mainLayout);
}

void Dialog::showName(QString name) {
    //lblName->setText(name);
}

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mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QtGui>
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
 
signals:
    void sendName(QString name);
 
private slots:
    void callDialog();
 
private:
    QLineEdit *leName;
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtGui>

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    
signals:
    void sendName(QString name);
    
private slots:
    void callDialog();

private:
    QLineEdit *leName;
};

#endif // MAINWINDOW_H

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mainwindow.cpp

#include "mainwindow.h"
#include "dialog.h"
#include <QWidget>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    // Controls
    QLabel *lblName = new QLabel(tr("Enter your name:"));
    leName = new QLineEdit;
    QPushButton *btnCallDialog = new QPushButton(tr("Call Dialog"));
 
    // Layout
    QGridLayout *mainLayout = new QGridLayout;
    mainLayout->addWidget(lblName, 0, 0);
    mainLayout->addWidget(leName, 0, 1);
    mainLayout->addWidget(btnCallDialog, 1, 0, 1, 2);
 
    // Set center widget
    QWidget *widget = new QWidget;
    widget->setLayout(mainLayout);
    this->setCentralWidget(widget);
 
    connect(btnCallDialog, SIGNAL(clicked()), this, SLOT(callDialog()));
}
 
void MainWindow::callDialog() {
    QDialog *dialog = new QDialog(this);
    connect(this, SIGNAL(sendName(QString)), dialog, SLOT(showName(QString)));
    emit sendName(leName->text());
    dialog->show();
}

#include "mainwindow.h"
#include "dialog.h"
#include <QWidget>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    // Controls
    QLabel *lblName = new QLabel(tr("Enter your name:"));
    leName = new QLineEdit;
    QPushButton *btnCallDialog = new QPushButton(tr("Call Dialog"));

    // Layout
    QGridLayout *mainLayout = new QGridLayout;
    mainLayout->addWidget(lblName, 0, 0);
    mainLayout->addWidget(leName, 0, 1);
    mainLayout->addWidget(btnCallDialog, 1, 0, 1, 2);

    // Set center widget
    QWidget *widget = new QWidget;
    widget->setLayout(mainLayout);
    this->setCentralWidget(widget);

    connect(btnCallDialog, SIGNAL(clicked()), this, SLOT(callDialog()));
}

void MainWindow::callDialog() {
    QDialog *dialog = new QDialog(this);
    connect(this, SIGNAL(sendName(QString)), dialog, SLOT(showName(QString)));
    emit sendName(leName->text());
    dialog->show();
}

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main.cpp

#include <QApplication>
#include "mainwindow.h"
 
int main (int argc, char *argv[]) {
    QApplication app(argc, argv);
 
    MainWindow window;
    window.show();
 
    return app.exec();
}

#include <QApplication>
#include "mainwindow.h"

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

    MainWindow window;
    window.show();

    return app.exec();
}

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Thank you!

[8Observer8]

I solved this problem.

I write instead:

void MainWindow::callDialog() {
    QDialog *dialog = new QDialog(this);
    connect(this, SIGNAL(sendName(QString)), dialog, SLOT(showName(QString)));
    emit sendName(leName->text());
    dialog->show();
}

void MainWindow::callDialog() {
    QDialog *dialog = new QDialog(this);
    connect(this, SIGNAL(sendName(QString)), dialog, SLOT(showName(QString)));
    emit sendName(leName->text());
    dialog->show();
}

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This code:

void MainWindow::callDialog() {
    Dialog dialog;
    connect(this, SIGNAL(sendName(QString)), &dialog, SLOT(showName(QString)));
    emit sendName(leName->text());
    dialog.exec();
}}

void MainWindow::callDialog() {
    Dialog dialog;
    connect(this, SIGNAL(sendName(QString)), &dialog, SLOT(showName(QString)));
    emit sendName(leName->text());
    dialog.exec();
}}

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[anda_skoa]

Obviously QDialog does not have a slot that you declared in a subclass of QDialog

Cheers,
_

[8Observer8]

Thank you