#includeThis code uses the DocumentLoader class to download an image from a given URL and display it in a window. It uses the QNetworkAccessManager class to handle the network communication and the QNetworkReply class to represent the server's response. The QUrl class is used to construct the URL object, which is passed to the QNetworkRequest object for the server request. The QNetworkReply object is then used to monitor the download progress and retrieve the data once it's completed. The QPixmap and QLabel classes are used to display the downloaded image in a window. The package library used in this example is the Qt Network module.#include int main(int argc, char *argv[]) { QApplication app(argc, argv); QNetworkAccessManager manager; QUrl url("http://example.com/image.png"); QNetworkRequest request(url); QNetworkReply *reply = manager.get(request); QObject::connect(reply, SIGNAL(finished()), &app, SLOT(quit())); app.exec(); // wait for download to finish if (reply->error() == QNetworkReply::NoError) { QPixmap pixmap; pixmap.loadFromData(reply->readAll()); QLabel label; label.setPixmap(pixmap); label.show(); return app.exec(); } else { qDebug() << "Download failed:" << reply->errorString(); return 1; } }