Hi!

I have a problem with a custom slot of a QLabel. The error that the compiler gives is:

Object::connect: No such slot QLabel::displayIzquierda(int)
Object::connect: (receiver name: 'izquierda')

It is the first time that I have a slot and i don't know where the error may be.

Thanks in advance!!!

trasera.h
Qt Code: 
  1. #ifndef TRASERA_H
  2. #define TRASERA_H
  3. #include <QtGui>
  4. #include "ui_trasera.h"
  5. #include "../include/prueba/ultrasonidos.h"
  6.  
  7. class Ultrasonidos;
  8.  
  9. class Trasera : public QWidget
  10. {
  11.     Q_OBJECT
  12.  
  13. public:
  14.     explicit Trasera(const QString &title, const QString &content, const QString &imagePath, QWidget *parent = 0);
  15.  
  16.     Ui::trasera ui;
  17.  
  18.     Ultrasonidos *ultra;
  19.     void inicializarInterfazUltrasonidos();
  20.  
  21. public slots:
  22.     void displayIzquierda (int i);
  23. };
  24.  
  25. #endif // TRASERA_H
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trasera.cpp
Qt Code: 
  1. #include "../include/prueba/trasera.h"
  2. #include "../build/ui_trasera.h"
  3. #include <QtGui>
  4. #include <qt4/QtCore/qnamespace.h>
  5.  
  6. Trasera::Trasera(const QString &title, const QString &content, const QString &imagePath, QWidget *parent) :
  7.     QWidget(parent)
  8. {
  9.     ui.setupUi(this);
  10.     ultra = new Ultrasonidos();
  11.     inicializarInterfazUltrasonidos();    
  12. }
  13.  
  14. void Trasera::inicializarInterfazUltrasonidos() 
  15. {
  16.     connect(ultra, SIGNAL(datoIzquierda(int)), ui.izquierda, SLOT(displayIzquierda(int)));    <---------- FAIL   //NOTE: ui.izquierda is a Qlabel
  17. }
  18.  
  19. void Trasera::displayIzquierda(int i) {
  20.    switch(i) {
  21.     case 0:
  22.       ui.izquierda->setPixmap(QPixmap(QString::fromUtf8(":/images/verde")));
  23.       break;
  24.     case 1:
  25.       ui.izquierda->setPixmap(QPixmap(QString::fromUtf8(":/images/amarillo")));
  26.       break;
  27.   }
  28. }
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Ultrasonidos.h
Qt Code: 
  1. class Ultrasonidos : public QThread 
  2. {
  3.        Q_OBJECT
  4.  
  5. public:
  6. 	Ultrasonidos();
  7.  
  8. signals:
  9.  
  10. 	void datoIzquierda(int i);
  11.  
  12. };
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