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++ // Copyright (C) 2022 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "testwindow.h"
++
++ //! [0]
++ #include <QtGui/QGuiApplication>
++ //! [0]
++ #include <QDebug>
++
++ #if defined(Q_OS_UNIX)
++ #if QT_VERSION < 0x060000
++ #include <QtX11Extras/QX11Info>
++ #endif
++ #endif
++
++ #include <X11/Xlib.h>
++ #include <xcb/xcb.h>
++
++ TestWindow::TestWindow(QWindow *parent)
++ : QWindow(parent)
++ {
++
++ #if QT_VERSION < 0x060000
++ Display *display = QX11Info::display();
++ xcb_connection_t *connection = QX11Info::connection();
++ bool isPlatformX11 = QX11Info::isPlatformX11();
++ #else
++ //! [1]
++ Display *display = nullptr;
++ xcb_connection_t *connection = nullptr;
++ bool isPlatformX11 = false;
++ if (auto *x11Application = qGuiApp->nativeInterface<QNativeInterface::QX11Application>()) {
++ display = x11Application->display();
++ connection = x11Application->connection();
++ isPlatformX11 = true;
++ }
++ // or
++ // isPlatformX11 = qGuiApp->nativeInterface<QNativeInterface::QX11Application>();
++ //! [1]
++ #endif
++
++ qDebug() << "Display *display=" << display;
++ if (display)
++ qDebug() << "XConnectionNumber=" << XConnectionNumber(display);
++
++ qDebug() << "xcb_connection_t *xcbConnection=" << connection;
++ if (connection) {
++ const xcb_setup_t *xcbSetup = xcb_get_setup(connection);
++ if (xcbSetup)
++ qDebug() << "protocol_major_version=" << xcbSetup->protocol_major_version << ", protocol_minor_version=" << xcbSetup->protocol_minor_version;
++ }
++
++ qDebug() << "isPlatformX11=" << isPlatformX11;
++ }