Qt工作笔记-主界面传输数据到附属界面（通过信号与槽非构造函数）

通过信号与槽非构造函数，

运行截图如下：

文件结构如下：

代码如下：

widget.h

#ifndef WIDGET_H

#define WIDGET_H

#include <QWidget>

#include "widget2.h"

namespace Ui {

class Widget;

}

class Widget : public QWidget

{

    Q_OBJECT

public:

    explicit Widget(QWidget *parent = 0);

    ~Widget();

signals:

    void sendSINGAL(QString data);

public slots:

    void sendMsgToWidget2();

private:

    Ui::Widget *ui;

    Widget2 *m_widget2;

};

#endif // WIDGET_H

widget2.h

#ifndef WIDGET2_H

#define WIDGET2_H

#include <QWidget>

namespace Ui {

class Widget2;

}

class Widget2 : public QWidget

{

    Q_OBJECT

public:

    explicit Widget2(QWidget *parent = 0);

    ~Widget2();

public slots:

    void getData(QString data);

private:

    Ui::Widget2 *ui;

};

#endif // WIDGET2_H

main.cpp

#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Widget w;

    w.show();

    return a.exec();

}

widget.cpp

#include "widget.h"

#include "ui_widget.h"

Widget::Widget(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Widget)

{

    ui->setupUi(this);

    connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(sendMsgToWidget2()));

}

void Widget::sendMsgToWidget2(){

    m_widget2=new Widget2();

    connect(this,SIGNAL(sendSINGAL(QString)),m_widget2,SLOT(getData(QString)));

    emit sendSINGAL(ui->lineEdit->text());

    m_widget2->show();

}

Widget::~Widget()

{

    delete ui;

}

widget2.cpp

#include "widget2.h"

#include "ui_widget2.h"

Widget2::Widget2(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Widget2)

{

    ui->setupUi(this);

}

void Widget2::getData(QString data){

    ui->listWidget->addItem(data);

}

Widget2::~Widget2()

{

    delete ui;

}