前言
在Qt中,要在两个界面之间进行数据传输,有几种方法,我这里演示使用Qt的自定义信号来进行数据。程序的大概流程是,打开主界面,点击一个按钮,弹出子窗口,然后主窗口可以往子窗口发信息,子窗口也可以往主窗口发信息。
示例运行结果如下:
代码
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QDialog>
#include "dialog.h"
#include <QDebug>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_OpenDialog_clicked();
void on_emitBtn_clicked();
void setStr(QString&);
private:
Ui::MainWindow *ui;
Dialog *dialog;
signals:
void mainWidgetStr(QString &);
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
dialog = new Dialog(this);
connect(dialog,SIGNAL(getStr(QString&)), this, SLOT(setStr(QString&)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_OpenDialog_clicked()
{
dialog->setModal(false); //模态
dialog->show();
}
void MainWindow::on_emitBtn_clicked()
{
connect(this,SIGNAL(mainWidgetStr(QString &)),dialog,SLOT(mainWidgetStr(QString &)));
QString str = ui->EmitLineEdit->text();
emit mainWidgetStr(str);
}
void MainWindow::setStr(QString &str)
{
ui->ReceiveLineEdit->setText(str);
}
dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
namespace Ui {
class Dialog;
}
class Dialog : public QDialog
{
Q_OBJECT
public:
explicit Dialog(QWidget *parent = 0);
~Dialog();
private slots:
void on_emitBtn_clicked();
void mainWidgetStr(QString &);
private:
Ui::Dialog *ui;
signals:
void getStr(QString &str);
};
#endif // DIALOG_H
dialog.cpp
#include "dialog.h"
#include "ui_dialog.h"
Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
}
Dialog::~Dialog()
{
delete ui;
}
void Dialog::on_emitBtn_clicked()
{
QString str = ui->EmitLineEdit->text();
emit getStr(str);
}
void Dialog::mainWidgetStr(QString &str)
{
ui->ReceiveLineEdit->setText(str);
}
整个项目地址:https://download.csdn.net/download/matt45m/12055957