QT实现windows窗口内嵌

app

    QSharedMemory shared("appID");

    //attach成功表示已经存在该内存了，表示当前存在实例
    if (shared.attach())//共享内存被占用则直接返回
        return 0;

    MainWindow w;
    w.show();

    qulonglong winID = (qulonglong)w.winId();
    shared.create(32);
    shared.lock();
    memcpy(shared.data(), &winID, sizeof(qlonglong));
    shared.unlock();

process

   // 启动窗口
    QProcess process;
    process.start("app.exe");
    process.waitForStarted();

    QSharedMemory shareMem("appID");
    if(!shareMem.isAttached())
        shareMem.attach();

    HWND winID;
    shareMem.lock();
    memcpy(&winID, shareMem.data(), sizeof (qulonglong));
    shareMem.unlock();
    shareMem.detach();
    qDebug() << "id:" << winID <<"\n";

    // 嵌入进程窗口显示
    auto window = QWindow::fromWinId((WId)winID);
    auto widget = QWidget::createWindowContainer(window, nullptr);
    widget->show();

效果 

注：调试崩溃会引起共享内存异常，需taskkill /f /im app.exe|process.exe

创作不易，小小的支持一下吧！