Question

I’m going nuts trying to find the problem here. I have a main window, and a form type window made in Qt. I’m using the Visual Studio 2010 addon. For some reason, my SLOT is never called in the main window; however, the signal appears to be emitted.

Here’s what I’ve done:

This is the form:

class ScalerValuesWindow : public QWidget
{
    Q_OBJECT

private:
    Ui::ScalerValuesWindow ui;

    // Variables
    std::vector<int> scalerValues;

public slots:
    void storeScalerValues();

signals:
    void ScalerValues(std::vector<int>);

public:
    ScalerValuesWindow(QWidget *parent = 0);

};

void ScalerValuesWindow::storeScalerValues()
{
    emit ScalerValues(scalerValues);
    hide();
}

Then here’s my main window connection line in my constructor:

scalerValuesWindow = new ScalerValuesWindow;
connect(scalerValuesWindow, SIGNAL(ScalerValues(std::vector<int>)), this, SLOT(RetrieveScalerValues(std::vector<int>)));

This is in my main window’s class declaration:

public slots:
    void RetrieveScalerValues(vector<int> scalerValues);

And this is the slot:

void RelayduinoGuiThreading::RetrieveScalerValues(vector<int> scalerVals)
{
    scalerValues = scalerVals;
}

I have Q_OBJECT declared in both. I have no idea what could be causing this.

Any advice would be greatly appreciated.

Answer 1

You must define your slot as:

public slots:
  void RetrieveScalerValues(std::vector<int> scalerValues);
                            ^^^

(Inspect the generated moc file to see exactly what signal/slot signatures are being generated.)

Don’t use using namespace std; in your headers, that’s bad practice anyway (pulls in that huge namespace into all the users of that header, which is impolite).