qt5base-lts/examples/network/downloadmanager/main.cpp

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#include <QCoreApplication>
#include <QStringList>
#include "downloadmanager.h"
#include <stdio.h>

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    QStringList arguments = app.arguments();
    arguments.takeFirst();      // remove the first argument, which is the program's name

    if (arguments.isEmpty()) {
        printf("Qt Download example\n"
               "Usage: downloadmanager url1 [url2... urlN]\n"
               "\n"
               "Downloads the URLs passed in the command-line to the local directory\n"
               "If the target file already exists, a .0, .1, .2, etc. is appended to\n"
               "differentiate.\n");
        return 0;
    }

    DownloadManager manager;
    manager.append(arguments);

    QObject::connect(&manager, SIGNAL(finished()), &app, SLOT(quit()));
    app.exec();
}