#include <qapplication.h>#include "downloader.h"int main(int argc, char *argv[]){    QApplication app(argc, argv);    QUrl url("ftp://ftp.example.com/");    if (argc >= 2)        url = argv[1];    Downloader downloader(url);    QObject::connect(&downloader, SIGNAL(finished()),                     &app, SLOT(quit()));    return app.exec();}