signals and slots, test example doesn't compile

[htroyo]

hello, i'm new using Qt, i tried to run an example using custom slots, here is the code:

#include <QObject>
#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QLabel>
 
class Class1 : public QWidget {
	Q_OBJECT
public:
	Class1(QWidget *p = 0) : QWidget(p) {
		b = new QPushButton("Click",this);
		l = new QLabel("Label",this);
		b->resize(100,30);
		b->move(10,60);
		l->resize(100,30);
		l->move(10,10);
		QObject::connect(b,SIGNAL(clicked()),this,SLOT(setl()));
	}
public slots:
	void setl() {
		l->setText("TEXT123");
	}
 
private:
	QPushButton *b;
	QLabel *l;
};
 
int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
 
  Class1 *c = new Class1();
  c->move(300,100);
  c->resize(120,100);
  c->show();
 
  return app.exec();
}

#include <QObject>
#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QLabel>

class Class1 : public QWidget {
	Q_OBJECT
public:
	Class1(QWidget *p = 0) : QWidget(p) {
		b = new QPushButton("Click",this);
		l = new QLabel("Label",this);
		b->resize(100,30);
		b->move(10,60);
		l->resize(100,30);
		l->move(10,10);
		QObject::connect(b,SIGNAL(clicked()),this,SLOT(setl()));
	}
public slots:
	void setl() {
		l->setText("TEXT123");
	}

private:
	QPushButton *b;
	QLabel *l;
};

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);

  Class1 *c = new Class1();
  c->move(300,100);
  c->resize(120,100);
  c->show();

  return app.exec();
}

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and if i try to build the app i get this error:

:: error: collect2: ld returned 1 exit status

:: error: collect2: ld returned 1 exit status

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what is wrong?

---

Added after 19 minutes:

well, i found the solution, it's because i was doing that in a bad way, i use a Class1.h, Class1.cpp and main.cpp as i should do...
Sometimes i'm too lazy and i just write down all my code in a single file because i dont want to use .h's hahahahha, well i know how to do it later, thanks anyway

[dbzhang800]

add such a line：

#include "main.moc"

#include "main.moc"

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