QT入门（三） 多窗体之间的数据传送_qt怎么在不用窗口之间传值

因为我用的是vs的编译器，所以网上例子很少，结合qt自带的编译器的例子，尝试了半天，实现从子窗体向主窗体的数据传递，

主窗体.h代码如下

#ifndef ALGORITHMREALIZEPLATFORM_H
#define ALGORITHMREALIZEPLATFORM_H
 
#include <QtWidgets/QMainWindow>
#include "ui_MainUI.h"
#include "childwindow.h"
 
class AlgorithmRealizePlatform : public QMainWindow
{
	Q_OBJECT
 
public:
	AlgorithmRealizePlatform(QWidget *parent = 0);
	~AlgorithmRealizePlatform();
signals:
	void sendsignal(QString);
 
private:
	Ui::AlgorithmRealizePlatformClass ui;
	childwindow CW;
	QPushButton QPB;
private slots:
	void reshow(QString);
	void test();
};
 
#endif // ALGORITHMREALIZEPLATFORM_H

主窗体.cpp文件

#include "algorithmrealizeplatform.h"
 
AlgorithmRealizePlatform::AlgorithmRealizePlatform(QWidget *parent)
	: QMainWindow(parent)
{
	ui.setupUi(this);
    //普通的窗体内部信号和槽体的连接
	connect(&QPB, &QPushButton::clicked, this, &AlgorithmRealizePlatform::test); 
    //与子窗体的信号连接      
	connect(&CW, &childwindow::send_data, this, &AlgorithmRealizePlatform::reshow);
}
 
AlgorithmRealizePlatform::~AlgorithmRealizePlatform()
{
	
}
 
void AlgorithmRealizePlatform::test()
{
	QString a = "aaaaaaaaaa";
	ui.label->setText(a);
	CW.show();
}
 
void AlgorithmRealizePlatform::reshow(QString y)
{
	QString a = "aaaaaaaaaa";
	ui.label->setText(y);
	//this->close();
}

 子窗体.h文件

#ifndef CHILDWINDOW_H
#define CHILDWINDOW_H
 
#include <QWidget>
#include "ui_childwindow.h"
 
class childwindow : public QWidget
{
	Q_OBJECT
 
public:
	childwindow(QWidget *parent = 0);
	~childwindow();
	QString buf;
	
signals:
	void send_data(QString y);
 
private:
	Ui::childwindow ui;
private slots:
	void on_push_close_clicked();
};
 
#endif // CHILDWINDOW_H

子窗体.cpp文件

#include "childwindow.h"
 
childwindow::childwindow(QWidget *parent)
	: QWidget(parent)
{
	ui.setupUi(this);
}
 
childwindow::~childwindow()
{
 
}
 
void childwindow::on_push_close_clicked()
{
	buf = ui.label->text();
	emit send_data(buf);    //传出子窗体信号
	this->close();
}

参照https://blog.csdn.net/weibo1230123/article/details/79116016改写的，

这里，我对connect(sender, SIGNAL(signal), receiver, SLOT(slot))的理解是：

1、sender和receiver分别是信号端和接收端的QObject的实例化，signal和slot是其中的具体方法

2、需要注意的是signal和slot的参数需要尽量一致吧，不要找麻烦，想继续的话，转https://blog.csdn.net/WilliamSun0122/article/details/72810352