本文共 1675 字，大约阅读时间需要 5 分钟。

话不多说，上图：

这里同样是采用了Qt的信号与槽机制。

项目文件分布如下：

代码如下：

dialog.h

1. #ifndef DIALOG_H

2. #define DIALOG_H

3.  

4. #include <QDialog>

5.  

6. namespace Ui {

7. class Dialog;

8. }

9.  

10. class Dialog : public QDialog

11. {

12. Q_OBJECT

13. signals:

14. void sendData(QString data);

15.  

16. public:

17. explicit Dialog(QWidget *parent = 0);

18. ~Dialog();

19.  

20. public slots:

21. void pressBtn();

22.  

23. private:

24. Ui::Dialog *ui;

25. };

26.  

27. #endif // DIALOG_H

widget.h

1. #ifndef WIDGET_H

2. #define WIDGET_H

3.  

4. #include <QWidget>

5. #include "dialog.h"

6.  

7. namespace Ui {

8. class Widget;

9. }

10.  

11. class Widget : public QWidget

12. {

13. Q_OBJECT

14.  

15. public slots:

16. void pressBtn();

17. void updateData(QString data);

18. public:

19. explicit Widget(QWidget *parent = 0);

20. ~Widget();

21.  

22. private:

23. Ui::Widget *ui;

24. Dialog *dialog;

25. };

26.  

27. #endif // WIDGET_H

dialog.cpp

1. #include "dialog.h"

2. #include "ui_dialog.h"

3.  

4. Dialog::Dialog(QWidget *parent) :

5. QDialog(parent),

6. ui(new Ui::Dialog)

7. {

8. ui->setupUi(this);

9. connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(pressBtn()));

10. }

11.  

12. void Dialog::pressBtn(){

13. emit sendData(ui->lineEdit->text());

14. this->close();

15. }

16.  

17. Dialog::~Dialog()

18. {

19. delete ui;

20. }

widget.cpp

1. #include "widget.h"

2. #include "ui_widget.h"

3.  

4. Widget::Widget(QWidget *parent) :

5. QWidget(parent),

6. ui(new Ui::Widget)

7. {

8. ui->setupUi(this);

9. connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(pressBtn()));

10. }

11.  

12. void Widget::updateData(QString data){

13. ui->textEdit->append(data);

14. }

15.  

16. void Widget::pressBtn(){

17. dialog=new Dialog();

18. connect(dialog,SIGNAL(sendData(QString)),this,SLOT(updateData(QString)));

19. if(dialog->exec()==QDialog::Accepted){

20. }

21. delete dialog;

22.  

23. }

24.  

25. Widget::~Widget()

26. {

27. delete ui;

28. }

main.cpp

1. #include "widget.h"

2. #include <QApplication>

3.  

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

5. {

6. QApplication a(argc, argv);

7. Widget w;

8. w.show();

9.  

10. return a.exec();

11. }