Value passing between Qt forms (Code backup), qt forms

Value passing between Qt forms (Code backup), qt forms

At the beginning, I was confused by the cloud. Now I know a little bit about it. Now assume there is a form, a MainWindow ,:

Click PushButton to transfer the content in the text box to MainWindow and display it as a Label. I have already painted the interface in advance. The following is the backup code:

Form. h:

#ifndef FORM_H#define FORM_H#include <QWidget>namespace Ui {class Form;}class Form : public QWidget{    Q_OBJECTpublic:    explicit Form(QWidget *parent = 0);    ~Form();signals:    void sendData(QString);private slots:    void on_sendBtn_clicked();private:    Ui::Form *ui;};#endif // FORM_H

Form. cpp:

#include "form.h"#include "ui_form.h"Form::Form(QWidget *parent) :    QWidget(parent),    ui(new Ui::Form){    ui->setupUi(this);}Form::~Form(){    delete ui;}void Form::on_sendBtn_clicked(){     emit sendData(ui->lineE->text());}

MainWindow. h:

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include "form.h"namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();private slots:    void receiveData(QString data);private:    Ui::MainWindow *ui;};#endif // MAINWINDOW_H

MainWindow. cpp:

# Include "mainwindow. h "# include" ui_main1_1_h "MainWindow: MainWindow (QWidget * parent): QMainWindow (parent), ui (new Ui: MainWindow) {ui-> setupUi (this ); // pass the value test Form * form = new Form; form-> setGeometry (100,300,400,400); form-> show (); connect (form, SIGNAL (sendData (QString )), this, SLOT (receiveData (QString);} MainWindow ::~ MainWindow () {delete ui;} void MainWindow: receiveData (QString data) {ui-> label-> setText (data );}

Main. cpp:

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