Another signal error message

[gib]

After my program executes (correctly) I see a long list of error messages. These do not reflect a serious problem, apparently (since the program runs OK) but they are annoying and I'd like to get rid of them.
All the messages look like this:
Object::connect: No such signal QLabel::labelClicked(QString)
Object::connect: (sender name: 'label_hour')
Object::connect: (receiver name: 'MainWindow')

with variations of sender name.

I have extended QLabel to QMyLabel thus:

#ifndef QMYLABEL_H
#define QMYLABEL_H

#include <qlabel.h>
class QMyLabel: public QLabel
{
Q_OBJECT
public:
QMyLabel(QWidget *parent = 0);
signals:
void labelClicked(QString text);
private:
void mousePressEvent (QMouseEvent *event);
};

#endif

and

QMyLabel::QMyLabel(QWidget *parent) : QLabel(parent)
{}

//------------------------------------------------------------------------------------------------------------------
// Redefines mousePressEvent for QMyLabel, which extends QLabel. This is used to display info about a model parameter.
//------------------------------------------------------------------------------------------------------------------
void QMyLabel::mousePressEvent (QMouseEvent *event) {
event->accept();
QString sname = objectName().mid(6);
QString text = "mousePressEvent";
// Find which label_ sent the signal, and read its text
for (int k=0; k<parm->nParams; k++) {
PARAM_SET param = parm->get_param(k);
if (sname.compare(param.tag) == 0)
text = param.text;
}
emit labelClicked(text);
}

In Qt Creator I promote many QLabels to QMyLabel in order to display info about the fields they label.

Why does this trigger error messages when the program executes?

[anda_skoa]

Check that this particular instance has indeed been promoted, e.g. check the generated ui_mainwindow.h file (or whatever yours is called).

Maybe "label_hour" is still of type QLabel

Cheers,
_

[gib]

Check that this particular instance has indeed been promoted, e.g. check the generated ui_mainwindow.h file (or whatever yours is called).

Maybe "label_hour" is still of type QLabel

Cheers,
_

Thanks anda_skoa! In fact I had neglected to promote a couple of QLabels, and this helped to confuse me. I now understand my own code (written years ago) better. I am blindly trying to connect all UI objects that have a name starting with "label_", which explains all those error messages, since my UI includes many QLabels that I do not want to promote to QMyLabel. So my new question is how can I detect whether or not a QLabel object has been promoted?

[anda_skoa]

If you mean "how can I detect if a label is of type QMyLabel", then the answer is cast

QMyLabel *myLabel = qobject_cast<QMyLabel*>(label);
if (myLabel != 0) {
  // label is in fact of type QMyLabel
} else {
  // label is not of type QMyLabel
}

QMyLabel *myLabel = qobject_cast<QMyLabel*>(label);
if (myLabel != 0) {
  // label is in fact of type QMyLabel
} else {
  // label is not of type QMyLabel
}

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Alternatively

if (label->inherits("QMyLabel")) {
}

if (label->inherits("QMyLabel")) {
}

To copy to clipboard, switch view to plain text mode 

Cheers,
_

[gib]

Excellent! Thanks a lot