在QCoreApplication中下载文件

#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QFile>

QNetworkAccessManager manager;

QNetworkRequest request;
request.setUrl(QUrl("下载文件的URL"));
QNetworkReply *reply = manager.get(request);

QObject::connect(reply, &QNetworkReply::downloadProgress, [](qint64 bytesReceived, qint64 bytesTotal) {
    // 下载进度处理
});

QObject::connect(reply, &QNetworkReply::finished, []() {
    // 下载完成处理
});

QFile file("保存文件的路径");
if (file.open(QIODevice::WriteOnly)) {
    file.write(reply->readAll());
    file.close();
}