QT embeds the sub QT program window into the current program

Subroutine main code

#include "ChildWidgets.h"
#include <QtWidgets/QApplication>
#include <QWindow>
#include <iostream>
#include <QMessageBox>
#include <thread>
int main(int argc, char* argv[])
{
    
	QApplication a(argc, argv);
	ChildWidgets w;
	w.show();
	w.createWinId();
	//  Output 
	std::cerr << w.winId() << std::endl;
	return a.exec();
}

The main code of the main program

InWidgets::InWidgets(QWidget* parent)
	: QMainWindow(parent)
{
    
	this->resize(600, 400);
	//  Get the path where the program is located 
	QString path = QCoreApplication::applicationDirPath();
	path += "/ChildWidgets.exe";

	process = new QProcess(this);

	connect(process, &QProcess::readyReadStandardError, [&]() {
    
		quint64 winId = process->readAllStandardError().toLongLong();
		QWindow* childWin = QWindow::fromWinId(winId);
		if (childWin)
		{
    
			QWidget* widget = QWidget::createWindowContainer(childWin);
			this->setCentralWidget(widget);
		}
		});
	process->start(path);

	//  Child window embeds in the current window 
	process->setParent(this);

}

result

Address ：https://download.csdn.net/download/qq_44575789/85800705