MFC程序中使用QT开发界面的实现步骤

/*!
    Creates an instance of QApplication, passing the command line of
    \a mfcApp to the QApplication constructor, and returns the new
    object. The returned object must be destroyed by the caller.

    Use this static function if you want to perform additional
    initializations after creating the application object, or if you
    want to create Qt GUI elements in the InitInstance()
    reimplementation of CWinApp:

    \code
    BOOL MyMfcApp::InitInstance()
    {
    // standard MFC initialization
    // ...

    // This sets the global qApp pointer
    QMfcApp::instance(this);

    // Qt GUI initialization
    }

    BOOL MyMfcApp::Run()
    {
    int result = QMfcApp::run(this);
    delete qApp;
    return result;
    }
    \endcode

    \sa run()
*/

BOOL CMFCWithQtApp::InitInstance()
{
	CWinApp::InitInstance();
	QMfcApp::instance(this);
	return true;
}

int CMFCWithQtApp::Run()
{
	int result = QMfcApp::run(this);
	delete qApp;
	return result;
}

// MainUI.h
#pragma once
#include <QWidget>

class MainUI: public QWidget
{
	Q_OBJECT
public:
	MainUI(QWidget* parent = nullptr);
	~MainUI();
};

//MainUI.cpp
#include "pch.h"
#include "MainUI.h"
#include <QPushButton>

MainUI::MainUI(QWidget* parent) :
	QWidget(parent)
{
	setWindowTitle("Qt Windows");
	setFixedSize(800, 720);

	QPushButton* pBtn = new QPushButton(QString::fromLocal8Bit("这是一个Qt按钮"), this);
}


MainUI::~MainUI()
{

}

BOOL CMFCWithQtApp::InitInstance()
{
	CWinApp::InitInstance();
	QMfcApp::instance(this);

	MainUI ui;
	ui.show();
	QMfcApp::exec();
	return FALSE;
}

// 表示在最后一个qt窗口退出时，关闭QApplication
setQuitOnLastWindowClosed(true); //将之前的false改为true

// ~QMfcApp() 中添加这两句，当析构完成后关闭进程
HANDLE hself = GetCurrentProcess();
TerminateProcess(hself, 0);

MainUI::MainUI(QWidget* parent) :
	QWidget(parent)
{
	setWindowTitle("Qt Windows");
	setFixedSize(800, 720);

	QPushButton* pBtn = new QPushButton(QString::fromLocal8Bit("这是一个Qt按钮"), this);
	connect(pBtn, &QPushButton::clicked, [=]() {
		QMessageBox::information(this, QString::fromLocal8Bit("信号槽"), QString::fromLocal8Bit("这是由信号槽弹出来的"));
		});
}

"uic.exe" "%(FullPath)" -o ".\ui_%(Filename).h"

//MainUI.h
#pragma once
#include <QWidget>
#include "ui_Main.h"

class MainUI: public QWidget
{
	Q_OBJECT
public:
	MainUI(QWidget* parent = nullptr);
	~MainUI();

private:
	Ui::mainUI* m_pUI;
};

//MainUI.cpp
#include "pch.h"
#include "MainUI.h"
#include <QPushButton>
#include <QMessageBox>

MainUI::MainUI(QWidget* parent) :
	QWidget(parent),
	m_pUI(new Ui::mainUI())
{
	m_pUI->setupUi(this);

	connect(m_pUI->pushButton, &QPushButton::clicked, [=]() {
		QMessageBox::information(this, QString::fromLocal8Bit("qt 信号槽测试"), m_pUI->lineEdit->text());
		});
}

MainUI::~MainUI()
{
	delete m_pUI;
}