Qt 4.8: How to use setText() of QLineEdit.

[amitahire]

I recently migrated from Qt 3 to Qt4.8 ( I know huge jump.) Was restricted to work on qt3 before. Anyway, I was trying out this particular program, where I am creating two QLineEdit boxes and trying to to get the text of l1 to l2 (l1 and l2 bring the names of the QLineEdit respectively.) For this I was created the signal and slots but when I compile I get this error "Undefined reference to setText()". I was using the signal textChanged() of l1 and slot of l2 - setText(). Think anyone can help me on this?



I think I am just missing something. Got gambled with all the qt3 and 4 concepts. Please pardon my poor code and concepts. Patience would be appriciated. Thanks.
try1.cpp

#include<QtGui>
#include<QDialog>
#include<QLineEdit>
#include<QLabel>
#include<QPushButton>
#include "try1.h"
#include "ui_try1.h"
 
try1::try1(QWidget *parent):QDialog(parent), ui(new Ui::Dialog)
{
 //ui->setupUi(this);
connect(ui->l1,SIGNAL(textChanged(const QString &)),ui->l2,SLOT(setText(const QString &)) );
//connect(ui->Quit,SIGNAL(clicked()),this,SLOT(close()));
}

#include<QtGui>
#include<QDialog>
#include<QLineEdit>
#include<QLabel>
#include<QPushButton>
#include "try1.h"
#include "ui_try1.h"

try1::try1(QWidget *parent):QDialog(parent), ui(new Ui::Dialog)
{
 //ui->setupUi(this);
connect(ui->l1,SIGNAL(textChanged(const QString &)),ui->l2,SLOT(setText(const QString &)) );
//connect(ui->Quit,SIGNAL(clicked()),this,SLOT(close()));
}

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try1.h

#ifndef TRY1_H
#define TRY1_H
#include "ui_try1.h"
#include<QDialog>
#include<QLineEdit>
#include<QLabel>
#include<QPushButton>
//class ;
//class QLineEdit;
//class QPushButton;
 
namespace Ui
{
    class Dialog;
}
 
 
class try1:public QDialog
{
   Q_OBJECT
public:
   try1(QWidget *parent=0);
private:
  Ui::Dialog *ui;
signals:
    void textChanged(const QString &text);
   // void clicked();
private slots:
   void setText(const QString &text);
   //void close();
private:
   QLabel *l1;
   QLabel *l2;
   QLineEdit *t1;
   QLineEdit *t2;
   QPushButton *Quit;
};
 
#endif

#ifndef TRY1_H
#define TRY1_H
#include "ui_try1.h"
#include<QDialog>
#include<QLineEdit>
#include<QLabel>
#include<QPushButton>
//class ;
//class QLineEdit;
//class QPushButton;

namespace Ui
{
    class Dialog;
}


class try1:public QDialog
{
   Q_OBJECT
public:
   try1(QWidget *parent=0);
private:
  Ui::Dialog *ui;
signals:
    void textChanged(const QString &text);
   // void clicked();
private slots:
   void setText(const QString &text);
   //void close();
private:
   QLabel *l1;
   QLabel *l2;
   QLineEdit *t1;
   QLineEdit *t2;
   QPushButton *Quit;
};

#endif

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main.cpp (init)

#include<QtGui>
#include<QApplication>
#include<QDialog>
#include "try1.h"
 
int main(int argc,char *argv[])
{
   QApplication app(argc,argv);
   try1 d;
   d.show();
   return app.exec();
}

#include<QtGui>
#include<QApplication>
#include<QDialog>
#include "try1.h"

int main(int argc,char *argv[])
{
   QApplication app(argc,argv);
   try1 d;
   d.show();
   return app.exec();
}

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Also attaching the zip file of the project. And again really sorry for messy code.