話不多說(shuō)，上圖：

這里同樣是采用了Qt的信號(hào)與槽機(jī)制。

項(xiàng)目文件分布如下：

代碼如下：

dialog.h

#ifndef DIALOG_H #define DIALOG_H#include <QDialog>namespace Ui { class Dialog; }class Dialog : public QDialog {Q_OBJECT signals:void sendData(QString data);public:explicit Dialog(QWidget *parent = 0);~Dialog();public slots:void pressBtn();private:Ui::Dialog *ui; };#endif // DIALOG_H

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> #include "dialog.h"namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic slots:void pressBtn();void updateData(QString data); public:explicit Widget(QWidget *parent = 0);~Widget();private:Ui::Widget *ui;Dialog *dialog; };#endif // WIDGET_H

dialog.cpp

#include "dialog.h" #include "ui_dialog.h"Dialog::Dialog(QWidget *parent) :QDialog(parent),ui(new Ui::Dialog) {ui->setupUi(this);connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(pressBtn())); }void Dialog::pressBtn(){emit sendData(ui->lineEdit->text());this->close(); }Dialog::~Dialog() {delete ui; }

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(pressBtn())); }void Widget::updateData(QString data){ui->textEdit->append(data); }void Widget::pressBtn(){dialog=new Dialog();connect(dialog,SIGNAL(sendData(QString)),this,SLOT(updateData(QString)));if(dialog->exec()==QDialog::Accepted){}delete dialog;}Widget::~Widget() {delete ui; }

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

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