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代码： 全选

#include <iostream>
#include <QtCore>
using namespace std;


class Employee : public QObject
{
	Q_OBJECT
public:
	Employee()
	{
		mySalary = 0;
		mySalary2 = 0;
		connect(this,SIGNAL(salaryChanged(int)),this,SLOT(setSalary(int)));
	}
	int salary() const
	{
		return mySalary;
	}
public slots:
	void setSalary(int newSalary);

signals:
	void salaryChanged(int newSalary);

private:
	int mySalary;
	int mySalary2;

};

void Employee::salaryChanged(int newSalary)
{
	mySalary = newSalary;
}

void Employee::setSalary(int newSalary)
{
	mySalary2 = newSalary;
}

int main()
{	cout << "begin" << endl;
	Employee *em = new Employee();
        //ToDO
	cout << "begin" << endl;
	return 0;
}

代码： 全选

int main(int argc,char *argv[])
{
    QApplication app(argc,argv);
    QLabel hello("Hello Qt!");
	hello.resize(400,200);	
    hello.show();
    return app.exec();
}

代码： 全选

//employee.h
#include <QtCore>
#include <QApplication>
#include <iostream>
#include <QWidget>
using namespace std;

class Employee:public QObject
{
 Q_OBJECT
public:
    Employee();
    int getValue()
    {
        return value;
    }
    void peek();        //peek the private value
    void changeValue(int); //changeValue by manual and then ruslt in emiting  a signal
public slots:         //if valueChanged then setValue
    void setValue(int);
signals:
    void valueChanged(int);
private:
    int value;
};

代码： 全选

//employee.cpp
#include "employee.h"
Employee::Employee()
{
    value = 0;
    cout<<"the initial value is 0"<<endl;
    QObject::connect(this,SIGNAL(valueChanged(int)),this,SLOT(setValue(int)));
}

void Employee::changeValue(int num)
{
    if(value != num)
    {
        emit valueChanged(num);
    }
}

void Employee::setValue(int newValue)
{
    value = newValue;
}

void Employee::peek()
{
    cout<<"The value you have peeked is "<<value<<endl;
}

代码： 全选

//main.cpp
#include "employee.h"
#include <QApplication>
int main (int argc, char * argv[])
{
    QApplication app(argc, argv);
    cout<<"begin"<<endl;
    Employee em;
    cout<<em.getValue()<<endl;
    em.changeValue(6);
    cout<<em.getValue()<<endl;
    cout<<"end"<<endl;
    return  app.exec();
}