exe文件运行窗口嵌入Qt窗口

 原理就是使用3个函数 FindWindow 、 QWindow::fromWinId 和 QWidget::createWindowContainer，具体实现如下：

#pragma once

#include 
#include 
#include "ui_UE42Qt.h"


class UE42Qt : public QMainWindow
{
    Q_OBJECT

public:
    UE42Qt(QWidget *parent = Q_NULLPTR);

private:
    Ui::UE42QtClass *ui;

private:
    QProcess* process;

public:
    void StartUE4();
    void doInsideUE4(QString const& className, QString const& appName);
};

 

#include "UE42Qt.h"
#include 
#include 


UE42Qt::UE42Qt(QWidget *parent)
    : QMainWindow(parent)
{
    ui->setupUi(this);
    StartUE4();
}

void UE42Qt::StartUE4()
{
    //启动UE4程序
    QString sPath = "./WindowsNoEditor/Che.exe";
    process = new QProcess;
    process->start(sPath);
    Sleep(3000);

    if (process->waitForStarted())
    {
        //这两个参数用 VS 下的 Tools->Spy++ 获取
        QString ClassName("UnrealWindow");
        QString AppName("Che (64-bit Development PCD3D_SM5) ");
        doInsertUE4(ClassName, AppName);
    }

}

//将UE4嵌入到QT中
void UE42Qt::doInsertUE4(QString const& className, QString const& appName)
{
    QWindow* m_window;
    HWND AppWnd;
    LPCWSTR App = reinterpret_cast (className.data());
    LPCWSTR AppCaption = reinterpret_cast (appName.data());
    AppWnd = ::FindWindow(App, AppCaption);
    m_window = QWindow::fromWinId((WId)AppWnd);
    if (m_window)
    {
        m_window->setFlags(m_window->flags() | Qt::CustomizeWindowHint | Qt::WindowTitleHint);
        QRect temp = ui->UE4Widget->geometry();
        ui->UE4Widget = QWidget::createWindowContainer(m_window, this, Qt::Widget);
        ui->UE4Widget->setFocusPolicy(Qt::StrongFocus);
        ui->UE4Widget->setFocus(Qt::MouseFocusReason);
        ui->UE4Widget->grabKeyboard();
        ui->UE4Widget->grabMouse();
        ui->UE4Widget->setGeometry(temp);
        this->setFocusPolicy(Qt::ClickFocus);
    }
}

 

// main 函数

#include "UE42Qt.h"
#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    UE42Qt w;
    w.show();

    return a.exec();
}