How does QT turn qwigdet into qdialog

Simple record , For your own convenience , The old hand flew past

First turn on the QWidget Change to QDialog, Add two buttons by yourself , Generally, it is to confirm and cancel , Browse files and so on , Then add slot, That's all right. , Directly call... When confirming and canceling qt Of

#pragma once
#include <QDialog>
#include <QWidget>
#include "ui_QExportResDlg.h"

class QExportResDlg : public QDialog
{
	Q_OBJECT

public:
	QExportResDlg(QWidget *parent = Q_NULLPTR,bool bExportAll= false);
	~QExportResDlg();
	QString m_strFilePath;
private:
	Ui::QExportResDlg ui;
public slots:
	void OnBrowseClick(bool);
	void OnConfigSave();
	void OnConfigCancle();
private:
	bool m_bExportAllFlag;
};

#include "QExportResDlg.h"
#include <QtGui>
#include <QFileDialog>

QExportResDlg::QExportResDlg(QWidget *parent,  bool bExportAll )
	: QDialog(parent)
{
	ui.setupUi(this);
	m_bExportAllFlag = bExportAll;
	connect(ui.btnConfigOk, SIGNAL(clicked()), this, SLOT(OnConfigSave()));
	connect(ui.btnConfigCancle, SIGNAL(clicked()), this, SLOT(OnConfigCancle()));
	connect(ui.btnBrow, SIGNAL(clicked(bool)), this, SLOT(OnBrowseClick(bool)));
	m_strFilePath = "";
}

QExportResDlg::~QExportResDlg()
{

}


void QExportResDlg::OnBrowseClick(bool)
{
	QFileDialog dlg;

	dlg.setFileMode(QFileDialog::Directory);

	dlg.setOption(QFileDialog::ShowDirsOnly, true);

	if (dlg.exec())
	{
		QString resRoot = dlg.selectedFiles()[0];
		ui.btnBrowserDir->setText(resRoot);
		m_strFilePath = resRoot;
		//ShowUpdateNotice(resRoot);

	}
}



void QExportResDlg::OnConfigSave()
{
	

	accept();
}

void QExportResDlg::OnConfigCancle()
{
	reject();
}

Call the following ：

QExportResDlg dlg(Q_NULLPTR,true);
	int code = dlg.exec();
	if (code == QDialog::Accepted)
	{
}