I am trying to program an App that fetches files from a server.
I have a 'Window' class(mainwindow.cpp, which is a widget class that would be the UI) and then I have a 'Backend' class(Backend.cpp).
The GUI has a push button and two radio buttons. If the radio button "remote" is seleted, then upon clicking the push button will lead to fetching files from server.
However, there is some problem in the 'connect' call in Backend.cpp which I can't figure out. The error I get is: no matching function call to 'QObject::connect(QNetworkReply*&), const char[13], Backend* const, const char[20])'
Here are the codes:
ANSWER: Avoid circular inclusions!!!!
Here are the updated codes:
mainwindow.h
#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
#include <QRadioButton>
#include <QtNetwork/QTcpSocket>
#include <QtNetwork/QHostAddress>
#include <QFile>
#include <QUrl>
#include "Backend.h"
class QGroupBox;
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
QTcpSocket *conn;
QFile *file;
QUrl url;
Backend backend_inst;
private:
QRadioButton *button_local;
QRadioButton *button_remote;
QGroupBox *createPushButtonGroup();
private slots:
void onClick_button1();
void onCheck_local();
void onCheck_remote();
};
#endif
mainwindow.c
#include <QtGui>
#include "mainwindow.h"
Window::Window(QWidget *parent)
: QWidget(parent)
{
QGridLayout *grid = new QGridLayout;
grid->addWidget(createPushButtonGroup(), 1, 1);
setLayout(grid);
setWindowTitle(tr("File-Fetch App"));
resize(480, 420);
}
QGroupBox *Window::createPushButtonGroup()
{
QGroupBox *groupBox = new QGroupBox();
QPushButton *pushButton1 = new QPushButton(tr("Fetch Files!!"));
button_local = new QRadioButton(tr("&Download Files from Local Storage"));
button_remote = new QRadioButton(tr("&Download Files from a Web-Server"));
button_local->setChecked(1);
connect(pushButton1,SIGNAL(clicked()), this, SLOT(onClick_button1()));
QVBoxLayout *vbox = new QVBoxLayout;
vbox->addWidget(pushButton1);
vbox->addSpacing(50);
vbox->addWidget(button_local);
vbox->addWidget(button_remote);
vbox->addStretch(1);
groupBox->setLayout(vbox);
return groupBox;
}
void Window::onClick_button1()
{
QTextStream out(stdout);
out << "fetch button clicked\n";
if (button_local->isChecked()){
onCheck_local();
}
else if (button_remote->isChecked()){
onCheck_remote();
}
}
void Window::onCheck_local()
{
QTextStream out(stdout);
out << "local update button checked\n";
}
void Window::onCheck_remote()
{
QTextStream out(stdout);
out << "remote update button checked\n";
QString pathname= "http://192.168.1.1:8000/example.txt";
QUrl webaddr = pathname;
backend_inst.FetchFile(webaddr);
}
Backend.h
#ifndef BACKEND_H
#define BACKEND_H
#include <QObject>
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include <QUrl>
#include <QTextStream>
class Backend : public QObject
{
Q_OBJECT
public:
Backend(QObject* parent=0);
void FetchFile(QUrl fpath);
public slots:
void getBytesFromFile();
private:
QNetworkReply *reply;
QNetworkAccessManager qnam;
};
#endif // BACKEND_H
Backend.cpp
#include "Backend.h"
Backend::Backend(QObject* parent)
: QObject(parent)
{
}
void Backend::FetchFile(QUrl fpath)
{
reply = qnam.get(QNetworkRequest(fpath));
QObject::connect(reply, SIGNAL(readyRead()),this, SLOT(getBytesFromFile()));
//qnam = new QNetworkAccessManager;
//QObject::connect(&qnam, SIGNAL(finished(QNetworkReply*)), this, SLOT(getBytesFromFile()));
}
void Backend::getBytesFromFile(){
QByteArray downloadedData;
QTextStream out(stdout);
out << "we are loading data from URL\n";
downloadedData =reply->readAll();
out << downloadedData;
delete reply;
}
main.cpp
#include <QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window window;
window.show();
return app.exec();
}
To use signals and slots, your classes (both signaling and slotting) must derive from QObject, i.e.
#include "mainwindow.h"
#include <QObject>
class Backend : public QObject
{
Q_OBJECT
public:
Backend(QObject* parent=0);
[...]
Backend::Backend(QObject* parent)
: QObject(parent)
{
}
You posted this:
class Backend
{
// Q_OBJECT
public:
Backend();
void FetchFile(QUrl fpath);
public slots:
void getBytesFromFile();
private:
QNetworkReply *reply;
QNetworkAccessManager qnam;
};
Q_OBJECT is still commented if yes remove it.. you are using signal and slots..
EDIT :
try to avoid circular inclusion:
you included Backend in mainwindow and viceversa..
The commented out lines:
qnam = new QNetworkAccessManager;
QObject::connect(&qnam, SIGNAL(finished(QNetworkReply*)), this, SLOT(getBytesFromFile()));
Were what's causing your issue. Connect excepts a pointer, not a pointer-to-pointer. qnam is a pointer was a pointer in the previous version of the code and using the address-of operator on it would turn it into a pointer-to-pointer. Second mistake is that you need to have the same signature for your signal and slot in order to get it called (otherwise you get a runtime error). So, correctly:
connect(qnam, SIGNAL(finished(QNetworkReply*)), this, SLOT(getBytesFromFile(QNetworkReply*)));
(and obviously, change the actual signature of the getBytesFromFile method).
As to why your error persists despite commenting the code out: I think you are running an old build and the new one is failing to build due to the vtable issue (as you described in the comment thread). My guess is that qmake is glitching out, which I have experienced when adding the Q_OBJECT macro to already existing classes. Go to your build folders and delete Makefile* everywhere. Then go back to Qt creator and rebuild the project, that should force qmake to generate the Makefiles again.
It seems you have some problems with build mechanism. With posted code and un-commented
QObject::connect(&qnam, SIGNAL(finished(QNetworkReply*)), this, SLOT(getBytesFromFile())); in Backend::FetchFile function, all your code works. Running and with checked "Download Files from Web-Server" it prints the "we are loading data from URL" from getBytesFromFile - isn't this the slot you want to be called ?
Related
I would like to make some modifications of the main window from another file.
I created another ui file Form1Window (which open when a button is cliked in the MainWindow).
I want to call from the class Form1Window a function named test() of the MainWindow class
I succeed in calling function test() but I can't execute the whole content of the function (I can display a message but can't execute the part where I want to clear an edittext)
MainWindow.h
#include "form1window.h"
public slots:
void nettoyer();
private slots:
void openFrom1();
private:
Ui::MainWindow *ui;
From1Window *uiFrom1;
};
MainWindow.cpp
void MainWindow::openFrom1()
{
uiFrom1 = new From1Window(this);
uiFrom1->show();
}
void MainWindow::nettoyer(){
QMessageBox msgBox;
msgBox.setText("test");
msgBox.setIcon(QMessageBox::Information);
msgBox.setStandardButtons(QMessageBox::Ok);
msgBox.exec();
ui->auteur->clear();
//THIS LINE HAS NO EFFECT WHEN CALLED FROM THE OTHER CLASS
}
form1window.cpp
#include "mainwindow.h"
#include "ui_form1window.h"
void From1Window::on_supprimer_clicked()
{
MainWindow *a=new MainWindow ();
a->test();
close();
}
I've read about the role of the pointer of MainWindow class (C++ /Qt Proper way to access ui from another class in qt //Edited) and I've also tried connect()
Thank for your help
//THIS LINE HAS NO EFFECT WHEN CALLED FROM THE OTHER CLASS
this->ui->auteur->clear();
The line will never executed unless you dismiss QMessageBox. This is because you triggered QMessageBox with exec() function. This function has its own event queue and does not return until finishes. You may set QMessageBox as modal and display it with show() method. In that case QMessageBox will not block execution of the the flow.
This problem can also happen with QDialog(s) if you display them with exec().
I provide you a simple two window signal/slot example:
main.cpp
#include "mainwindow.h"
#include "form.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Form f;
f.show();
return a.exec();
}
form.h
#ifndef FORM_H
#define FORM_H
#include <QWidget>
#include <QPushButton>
class Form : public QWidget
{
Q_OBJECT
public:
explicit Form(QWidget *parent = 0);
~Form();
private:
QPushButton *pb;
};
#endif // FORM_H
form.cpp
#include "form.h"
#include "mainwindow.h"
#include <QDebug>
Form::Form(QWidget *parent) : QWidget(parent)
{
MainWindow *mw = new MainWindow();
pb = new QPushButton("clickME", this);
QObject::connect(pb, SIGNAL(clicked()), mw, SLOT(test()));
mw->show();
}
Form::~Form()
{
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QLabel>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public slots:
void test();
private:
QLabel *l;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
l = new QLabel("test", this);
}
MainWindow::~MainWindow()
{
}
void MainWindow::test() {
qDebug() << "test called!" << endl;
l->setText("text changed");
}
This works for me.
output
I'm using Qt 5 on a Windows and building a GUI App with multiple QDialog classes. I am trying to connect a signal from a QDialog in a triggered action of the QMainWindow class after instances of both have been created. I have read the documentation on Qt here: http://doc.qt.io/qt-4.8/signalsandslots.html and here: https://wiki.qt.io/New_Signal_Slot_Syntax. I have also read through many questions on stackoverflow that have helped correct some of the initial errors I was getting, but haven't helped me solve this problem.
The error I keep getting is:
"expected primary-expression before ',' token"
I have tried both the old syntax for connect
connect(sender, SIGNAL (valueChanged(QString,QString)),
receiver, SLOT (updateValue(QString)) );
and the new syntax (which is shown in the .cpp file below)
connect(sender, &Sender::valueChanged,
receiver, &Receiver::updateValue );
The MainWindow is created in the main.cpp and the 2nd dialog is created on_action_someAction_triggered(), so I know that the instances I am referencing exist. Is there a better way for me to connect the SIGNAL and the SLOT?
Here is the code I am working with (minus the extra unrelated code).
mainwindow .h:
#include <QMainWindow>
#include "shipdia.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public slots:
void loadSelectedShip(QString shipName);
private slots:
void on_actionNew_Ship_triggered();
private:
Ui::MainWindow *ui;
shipdia *sDialog;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTextStream>
#include <QObject>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actionNew_Ship_triggered()
{
sDialog = new shipdia(this);
QObject::connect(&shipdia, //this is were I attempt to
&shipdia::sendShip, //connect the signal/slot
this,&MainWindow::loadSelectedShip); //but always get an error
sDialog ->show();
}
void MainWindow::loadSelectedShip(QString shipName)
{
... do something ... //this code works, but the signal is never received
}
qdialog.h
#ifndef SHIPDIA_H
#define SHIPDIA_H
#include "functions.h"
#include <QDialog>
namespace Ui {
class shipdia;
}
class shipdia : public QDialog
{
Q_OBJECT
public:
explicit shipdia(QWidget *parent = 0);
~shipdia();
private slots:
void on_pushButton_2_clicked();
signals:
void sendShip(QString shipName);
private:
Ui::shipdia *ui;
};
#endif // SHIPDIA_H
qdialog.cpp
#include "shipdia.h"
#include "ui_shipdia.h"
#include <QObject>
#include <QMessageBox>
#include <QTextStream>
#include <QDir>
shipdia::shipdia(QWidget *parent) :
QDialog(parent),
ui(new Ui::shipdia)
{
ui->setupUi(this);
}
shipdia::~shipdia()
{
delete ui;
}
void shipdia::sendSelectedShip(QString shipName)
{
emit sendShip(shipName); //I previously just emitted sendSelectedShip,
//but separating the function did not fix it.
}
void shipdia::on_pushButton_2_clicked()
{
//Code below functions up to next comment
QString shipName = ui->line_23->text();
shipName = QDir::currentPath() + "/shipFolder/" + shipName + ".txt";
QFile shipFile(shipName);
QStringList stringList;
if (shipFile.open(QIODevice::ReadOnly))
{
QTextStream in(&shipFile);
while(!in.atEnd())
{
QString line = in.readLine();
if(line.isNull())
break;
else
stringList.append(line);
}
shipFile.close();
}
//Code above functions ^
sendSelectedShip(shipName); //this line does not produce an error
}
I think, the code should be
sDialog = new shipdia(this);
QObject::connect(sDialog,
&shipdia::sendShip,this,&MainWindow::loadSelectedShip);
and it should be placed in the constructor of the MainWindow, right after ui->setupUi(this); and the on_actionNew_Ship_triggered() function should look like this:
void MainWindow::on_actionNew_Ship_triggered()
{
sDialog ->show();
}
In your original code, a new instance of shipdia will be created everytime the on_actionNew_Ship_triggered() is called. That should be avoided.
Hope this helps.
While doing some threading tutorials I got carried away and decided to make a gui which will show me the effect of multiple threads writing to one variable and using mutex.
The app uses mainwindow.ui menu to create a new instance of the threaddialog class every time which then runs it's own thread, displaying it's count loop on labels. Before I get onto doing the loop and having a mutex 'toggle', I am trying to connect the count update between the mainwindow and threaddialog so mainwindow can show the global count updating.
I can't get the connect() right, I am trying to pass it a pointer to the new threaddialog I just made before it, as that will be signalling the count, and the signal itself. Then for slot I use the this pointer to send the address of MainWindow, as that is where the slot is located, and the slot name itself.
As it stands, the connect() line gives me this error for both signal and slot parameters.
C:\Users\btank\Documents\Qt Projects\QThreadClasses\mainwindow.cpp:46: error: C3867: 'ThreadDialog::gCountUpdate': non-standard syntax; use '&' to create a pointer to member
I have read the whole page on Qt signals and slots official docs to try and understand what I'm doing wrong but no luck and need help. I don't believe I'm doing anything wrong regarding sending those pointers to connect().
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QGridLayout>
#include <threaddialog.h>
#include <QLinkedList>
#include <QDebug>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
QGridLayout *layout = new QGridLayout();
void NewThread();
~MainWindow();
private slots:
void on_actionNew_Thread_triggered();
void on_actionDelete_Thread_triggered();
public slots:
void setGCount(int gCount);
private:
QLinkedList<ThreadDialog *> list;
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <threaddialog.h>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
//Clear memory list before using
list.clear();
qDebug() << list.count();
// Set layout in widget
QWidget *window = new QWidget();
window->setLayout(layout);
// Add widget to main window central widget
setCentralWidget(window);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actionNew_Thread_triggered()
{
NewThread();
}
void MainWindow::NewThread()
{
ThreadDialog *newThread = new ThreadDialog(list.count());
qDebug() << list.count();
connect(newThread, newThread->gCountUpdate, this, this->setGCount);
newThread->run();
list << newThread;
layout->addWidget(newThread);
}
void MainWindow::on_actionDelete_Thread_triggered()
{
layout->removeWidget(list.last());
delete list.last();
list.removeLast();
qDebug() << list.count();
}
void MainWindow::setGCount(int gcount)
{
ui->lblGCount->setText(QString::number(gcount));
}
threaddialog.h
#ifndef THREADDIALOG_H
#define THREADDIALOG_H
#include <QDialog>
#include <QThread>
namespace Ui {
class ThreadDialog;
}
class ThreadDialog : public QDialog
{
Q_OBJECT
public:
explicit ThreadDialog(int count, QWidget *parent = 0);
void run();
~ThreadDialog();
signals:
void gCountUpdate(int uCount);
private:
Ui::ThreadDialog *ui;
};
#endif // THREADDIALOG_H
threaddialog.cpp
#include "threaddialog.h"
#include "ui_threaddialog.h"
#include "mainwindow.h"
ThreadDialog::ThreadDialog(int count, QWidget *parent) :
QDialog(parent),
ui(new Ui::ThreadDialog)
{
ui->setupUi(this);
// Setup UI
ui->lblTCount->setText(QString("Thread %1").arg(count));
}
ThreadDialog::~ThreadDialog()
{
delete ui;
}
void ThreadDialog::run()
{
for(int i = 0; i < 100; i++)
{
qDebug() << (QString("Thread loop %1").arg(i));
ui->lblTNum->setText(QString("Thread %1").arg(i));
emit this->gCountUpdate(i);
QThread::sleep(100);
}
}
This is how it should look like:
connect(newThread, &ThreadDialog::gCountUpdate
this, &MainWindow::setGCount);
You need to get a pointer to the method, not call the method.
I am having difficulty in my Qt program with connecting button signals to my slots. My code is:
Main.cpp
#include <QtGui/QApplication>
#include "MainWidget.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWidget mainWidget;
mainWidget.show();
return app.exec();
}
MainWidget.h
#ifndef MAINWIDGET_H
#define MAINWIDGET_H
#include <QWidget>
class MainWidget : public QWidget
{
public:
MainWidget();
public slots:
void bAdvice_clicked();
void bWeather_clicked();
void bNextMeeting_clicked();
void bQuit_clicked();
};
#endif // MAINWIDGET_H
MainWidget.cpp
#include "MainWidget.h"
#include <QMessageBox>
#include <QPushButton>
#include <QTextEdit>
#include <QVBoxLayout>
MainWidget::MainWidget()
{
QLayout *layout = new QVBoxLayout();
this->setLayout(layout);
QTextEdit *message = new QTextEdit();
layout->addWidget(message);
QPushButton *bAdvice = new QPushButton("Advice");
connect(bAdvice, SIGNAL(clicked()), this, SLOT(bAdvice_clicked()));
layout->addWidget(bAdvice);
QPushButton *bWeather = new QPushButton("Weather");
connect(bWeather, SIGNAL(clicked()), this, SLOT(bWeather_clicked()));
layout->addWidget(bWeather);
QPushButton *bNextMeeting = new QPushButton("Next Meeting");
connect(bNextMeeting, SIGNAL(clicked()), this, SLOT(bNextMeeting_clicked()));
layout->addWidget(bNextMeeting);
QPushButton *bQuit = new QPushButton("Quit");
connect(bQuit, SIGNAL(clicked()), this, SLOT(bQuit_clicked()));
layout->addWidget(bQuit);
}
void MainWidget::bAdvice_clicked()
{
}
void MainWidget::bWeather_clicked()
{
}
void MainWidget::bNextMeeting_clicked()
{
QMessageBox::information(this, "Next Meeting", "Today", QMessageBox::Ok);
}
void MainWidget::bQuit_clicked()
{
this->close();
}
The program outputs the following:
Starting C:\Users\Sameer\Documents\PartAQuestion2\debug\PartAQuestion2.exe...
Object::connect: No such slot QWidget::bAdvice_clicked() in MainWidget.cpp:16
Object::connect: No such slot QWidget::bWeather_clicked() in MainWidget.cpp:20
Object::connect: No such slot QWidget::bNextMeeting_clicked() in MainWidget.cpp:24
Object::connect: No such slot QWidget::bQuit_clicked() in MainWidget.cpp:28
C:\Users\Sameer\Documents\PartAQuestion2\debug\PartAQuestion2.exe exited with code 0
The code seems right, no compiler warnings. Just this output at runtime. But it looks like I hooked the signals and slots up correctly.
Add Q_OBJECT to your class, like this:
class MainWidget : public QWidget
{
Q_OBJECT
You also have to run moc to generate some helper code. qmake does that automatically for your, but if you compile this yourself, you need to run moc.
When I started with Qt, I had this problem a lot. As I see it your slots are defined wrong. If you look at the signature for the signal (Qt Clicked Signal Docs), you will see that the argument list is (bool clicked = false).
The way Qt's signal & slots connect work at run time, is that it will only connect the signal and slot if they have the exact same signatures. If they don't match exactly, no connection.
so in MainWidget.h
public slots:
void bAdvice_clicked(bool);
In MainWidget.cpp
connect(bAdvice, SIGNAL(clicked(bool)), this, SLOT(bAdvice_clicked(bool)));
Things will start working for you.
Edited:
Compiled your code and all the slots were correctly called.
It was just the Q_OBJECT macro that was missing.
I am having difficulty in my Qt program with connecting button signals to my slots. My code is:
Main.cpp
#include <QtGui/QApplication>
#include "MainWidget.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWidget mainWidget;
mainWidget.show();
return app.exec();
}
MainWidget.h
#ifndef MAINWIDGET_H
#define MAINWIDGET_H
#include <QWidget>
class MainWidget : public QWidget
{
public:
MainWidget();
public slots:
void bAdvice_clicked();
void bWeather_clicked();
void bNextMeeting_clicked();
void bQuit_clicked();
};
#endif // MAINWIDGET_H
MainWidget.cpp
#include "MainWidget.h"
#include <QMessageBox>
#include <QPushButton>
#include <QTextEdit>
#include <QVBoxLayout>
MainWidget::MainWidget()
{
QLayout *layout = new QVBoxLayout();
this->setLayout(layout);
QTextEdit *message = new QTextEdit();
layout->addWidget(message);
QPushButton *bAdvice = new QPushButton("Advice");
connect(bAdvice, SIGNAL(clicked()), this, SLOT(bAdvice_clicked()));
layout->addWidget(bAdvice);
QPushButton *bWeather = new QPushButton("Weather");
connect(bWeather, SIGNAL(clicked()), this, SLOT(bWeather_clicked()));
layout->addWidget(bWeather);
QPushButton *bNextMeeting = new QPushButton("Next Meeting");
connect(bNextMeeting, SIGNAL(clicked()), this, SLOT(bNextMeeting_clicked()));
layout->addWidget(bNextMeeting);
QPushButton *bQuit = new QPushButton("Quit");
connect(bQuit, SIGNAL(clicked()), this, SLOT(bQuit_clicked()));
layout->addWidget(bQuit);
}
void MainWidget::bAdvice_clicked()
{
}
void MainWidget::bWeather_clicked()
{
}
void MainWidget::bNextMeeting_clicked()
{
QMessageBox::information(this, "Next Meeting", "Today", QMessageBox::Ok);
}
void MainWidget::bQuit_clicked()
{
this->close();
}
The program outputs the following:
Starting C:\Users\Sameer\Documents\PartAQuestion2\debug\PartAQuestion2.exe...
Object::connect: No such slot QWidget::bAdvice_clicked() in MainWidget.cpp:16
Object::connect: No such slot QWidget::bWeather_clicked() in MainWidget.cpp:20
Object::connect: No such slot QWidget::bNextMeeting_clicked() in MainWidget.cpp:24
Object::connect: No such slot QWidget::bQuit_clicked() in MainWidget.cpp:28
C:\Users\Sameer\Documents\PartAQuestion2\debug\PartAQuestion2.exe exited with code 0
The code seems right, no compiler warnings. Just this output at runtime. But it looks like I hooked the signals and slots up correctly.
Add Q_OBJECT to your class, like this:
class MainWidget : public QWidget
{
Q_OBJECT
You also have to run moc to generate some helper code. qmake does that automatically for your, but if you compile this yourself, you need to run moc.
When I started with Qt, I had this problem a lot. As I see it your slots are defined wrong. If you look at the signature for the signal (Qt Clicked Signal Docs), you will see that the argument list is (bool clicked = false).
The way Qt's signal & slots connect work at run time, is that it will only connect the signal and slot if they have the exact same signatures. If they don't match exactly, no connection.
so in MainWidget.h
public slots:
void bAdvice_clicked(bool);
In MainWidget.cpp
connect(bAdvice, SIGNAL(clicked(bool)), this, SLOT(bAdvice_clicked(bool)));
Things will start working for you.
Edited:
Compiled your code and all the slots were correctly called.
It was just the Q_OBJECT macro that was missing.