Signal-slot doesn't work using QThread - qt

Question

I am using QT framework. I have been using SIGNAL-SLOT for a while. I like it. :-)
But I cannot make it work when I use QThread. I always create new thread using “moveToThread(QThread …)” function.
Any suggestion? :-)
The error message is:
Object::connect: No such slot connection::acceptNewConnection(QString,int) in ..\MultiMITU600\mainwindow.cpp:14
Object::connect: (sender name: 'MainWindow')
I have read about similar problems but those were not connected to QThread.
Thanks, David
EDITED: you asked for source code
Here is one:
Here is the code:
The main class which contains the signal and the new thread:
mainwindow header:
class MainWindow : public QMainWindow
{
…
QThread cThread;
MyClass Connect;
...
signals:
void NewConnection(QString port,int current);
…
};
The constructor of the above class: .cpp
{
…
Connect.moveToThread(&cThread1);
cThread.start(); // start new thread
….
connect(this,SIGNAL(NewConnection(QString,int)),
&Connect,SLOT(acceptNewConnection(QString,int))); //start measuring
…
}
The class that contains the new thread and SLOT
Header:
class MyClass: public QObject
{
Q_OBJECT
….
public slots:
void acceptNewConnection(QString port, int current);
}
And the .cpp file of the above class:
void MyClass::acceptNewConnection(QString port, int current){
qDebug() << "This part is not be reached";
}
Finally I use emit in the class where the connection was made:
void MainWindow::on_pushButton_3_clicked()
{
…
emit NewConnection(port, 1);
}

Answer 1

class MyClass : public QObject
{
Q_OBJECT
public:
explicit MyClass(QObject *parent = 0);
public slots:
void acceptConnection(QString port, int current) {
qDebug() << "received data for port " << port;
}
};
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0) : QMainWindow(parent) {
myClass.moveToThread(&thread);
thread.start();
connect(this, SIGNAL(newConnection(QString,int)), &myClass, SLOT(acceptConnection(QString,int)));
emit newConnection("test", 1234);
}
signals:
void newConnection(QString, int);
private:
QThread thread;
MyClass myClass;
};
output:
received data for port "test"
Is your void MainWindow::on_pushButton_3_clicked() slot connected to a signal?
Also, for the sake of the clarity and readability of your code, keep the established naming convention and use lower case for object instances and member objects and methods.