QT 信号和槽的代码示例

使用到的函数及关键字

1、信号和槽的关联函数

bool QObject::connect (constQObject * sender, const char * signal, const QObject * receiver, const char * member);

2、关键字

signals、slots

3、代码事例

头文件

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

signals:

    void mySignal();

private slots:

    void mySlot();

    void on_pushButton_clicked();

private:

    Ui::MainWindow *ui;

    Obj* m_obj;

};

源文件

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    QObject::connect(this,SIGNAL(mySignal()),this, SLOT(mySlot()));

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_pushButton_clicked()

{

    //QMessageBox::information(NULL, "Title", "Content", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);

    emit mySignal();

}

void MainWindow::mySlot()

{

    QMessageBox::information(NULL, "Title2", "Content2", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);

}