qt信号与槽的测试

#include <QCoreApplication>
#include <QObject>
#include <QDebug>
#include "reader.h"
#include "newspaper.h"

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    bool a;
    Newspaper newspaper;
    Reader reader;
    a = QObject::connect(&newspaper, SIGNAL(newPaper(QString )),
                     &reader,    SLOT(receiveNewspaper(QString )));
    if(a)
    {
        newspaper.send("abc");
    }else
    {
        qDebug() << "error."<<endl;
    }
    return app.exec();
}

#include "reader.h"
#include <QDebug>

Reader::Reader(QObject *parent) : QObject(parent)
{

}
Reader::Reader() : QObject()
{

}

void Reader::receiveNewspaper(QString name)
{
    qDebug() << "Receives Newspaper: " << name << endl;
}

#include "newspaper.h"

#ifndef NEWSPAPER_H
#define NEWSPAPER_H

#include <QObject>

class Newspaper : public QObject
{
    Q_OBJECT
public:
    Newspaper(const QString & name)
    {
    }
    Newspaper(): QObject()
    {

    }
    void send(QString m_name)
    {
        emit newPaper(m_name);
    }
signals:
    void newPaper(QString name);
};

#endif // NEWSPAPER_H

#ifndef READER_H
#define READER_H

#include <QObject>

class Reader : public QObject
{
    Q_OBJECT
public:
    Reader();
    explicit Reader(QObject *parent);
public slots:
    void receiveNewspaper(QString name);

};

#endif // READER_H