我怎么能返回信息后，我的主窗口在Qt关闭

嗨，我是c++的新手，我一直在尝试在Ubuntu上创建一个程序，该程序将在多个设备上输出Opengazer(凝视跟踪软件)并返回单个坐标。这是通过为每个设备打开一个UDP套接字来完成的，然后将[Xcoordinate Ycoordinate]形式的文本输出发送到主程序，然后将数字进行比较，然后输出正确的坐标。

我发现在Qt中创建gui是建立每个设备相对位置的最佳方式。基本上，我遇到的问题是将UDP套接字上的信息带回主程序。在getInfo函数中，我创建了主窗口，其中创建了设备(另一个名为DeviceWidget的类)，并且可以移动以设置它们的相对位置。每个DeviceWidget都有一个与之关联的UDP套接字。当窗口关闭时，我想返回所有DeviceWidgets的QList，但是我有一个困难的时间，因为当窗口关闭时，所有的孩子都被破坏了。我也读到按钮不能返回值，所以这也行不通。

我张贴main.cpp和window.cpp。我可以发表更多，但我相信只有这两个是必要的。

任何想法?谢谢你的宝贵时间。

Main.cpp

#include <QApplication>
#include "window.h"
#include "devicewidget.h"
#include <QTimer>
QList<DeviceWidget*> getInfo(int argc, char *argv[]);
void delay();
int main(int argc, char *argv[])
{
    bool run = true;
    int numDevices, space, size;
    DeviceWidget *point;
    QList<DeviceWidget*> dList = getInfo(argc, argv);
    numDevices = dList.size();
    int xPos[numDevices], yPos[numDevices];
    QString buffers[numDevices], xString, yString;
    //begin tracking gaze
    if(run)
    {
        for(int i=0; i<numDevices; i++)
        {
            //get output of opengazers
            point = dList.at(i);
            buffers[i] = point->Server->getBuffer();
            space = buffers[i].indexOf(" ");
            size = buffers[i].size();
            xString = buffers[i].left(space);
            yString = buffers[i].right(size-space-1);
            xPos[i] = xString.toInt();
            yPos[i] = yString.toInt();
        }
        //print coordinate
        for(int i=0; i<numDevices; i++)
        {
            if((dList.at(i)->getXRes()/6<xPos[i]<dList.at(i)->getXRes()*5/6) && (dList.at(i)->getXRes()/4<xPos[i]<dList.at(i)->getXRes()*3/4))
            {
                qDebug() << xPos[i]+dList.at(i)->getXPos()*9-dList.at(0)->getXPos()*9 << " " << yPos[i]+dList.at(i)->getYPos()*9-dList.at(0)->getYPos()*9;
            }
        }
        delay();
    }

    return 0;
}
QList<DeviceWidget*> getInfo(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Window w;
    w.show();
    a.exec();
    return w.getList();
}
void delay()
{
    QTime dieTime= QTime::currentTime().addSecs(1);
    while( QTime::currentTime() < dieTime )
    QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
}

window.cpp

#include "window.h"
#include <QFrame>
#include <QPushButton>
#include <QVBoxLayout>
#include <devicewidget.h>
#include <QWidget>
#include <QDesktopWidget>
#include <QList>
#include "portdialog.h"
#include "udp.h"
Window::Window(QWidget *parent) :
    QWidget(parent),
    frame(new QFrame(this)),
    addButton(new QPushButton("Add Device", this)),
    doneButton(new QPushButton("Done", this))
{
    QVBoxLayout *layout = new QVBoxLayout;
    frame->setLineWidth(2);
    frame->setFrameStyle(QFrame::Box | QFrame::Plain);
    QPoint topLeft(0,0);
    QPoint bottomRight(100,100);
    const QRect rect(topLeft, bottomRight);
    frame->setFrameRect(rect);
    frame->setFixedHeight(300);
    frame->setFixedWidth(500);
    layout->addWidget(frame);
    layout->addWidget(addButton);
    layout->addWidget(doneButton);
    setLayout(layout);
    connect(addButton, SIGNAL(released()), this, SLOT(on_addButton_pressed()));
    connect(doneButton, SIGNAL(released()), this, SLOT(on_doneButton_pressed()));
    DeviceWidget *primary = new DeviceWidget(frame, 200, 200, 20230);
    primary->setFixedHeight(getResolutionY()/10);
    primary->setFixedWidth(getResolutionX()/10);
    primary->show();
    primary->move(200,200);
    list.append(primary);
}
void Window::on_addButton_pressed()
{
    //pop-up for port
    PortDialog *pop = new PortDialog(this);
    pop->exec();
    int port = pop->getPort();
    /*int xRes = pop->getXRes();
    int yRes = pop->getYRes();*/
    int xRes = 1360;
    int yRes = 760;
    //create and show widget
    DeviceWidget *secondary = new DeviceWidget(frame, 200, 200, port);
    secondary->createServer(port, xRes, yRes);
    secondary->setFixedHeight(secondary->getYRes() / 9);
    secondary->setFixedWidth(secondary->getXRes() / 9);
    secondary->show();
    secondary->move(200,200);
    list.append(secondary);
}
void Window::on_doneButton_pressed()
{
    this->close();
}
int Window::getResolutionX()
{
    QDesktopWidget widget;
    QRect mainScreenSize = widget.availableGeometry(widget.primaryScreen());
    return mainScreenSize.width();
}
int Window::getResolutionY()
{
    QDesktopWidget widget;
    QRect mainScreenSize = widget.availableGeometry(widget.primaryScreen());
    return mainScreenSize.height();
}
QList<DeviceWidget*> Window::getList()
{
    return list;
}