QT FTP的方式访问其他电脑文件

FTP配置：https://www.jb51.net/article/111054.htm

downLoadFile("ftp://"+ IP +"//db//program.db", "C:/chenhe/db/program.db");

void WeldTool::downLoadFile(QString url, QString strSavePath) {
    QFile* tempFile;
    QTimer timer;
    bool loadFlag = false;
    QNetworkRequest request;
    QNetworkReply* reply = nullptr;
    request.setUrl(QUrl(url));
    QNetworkAccessManager* g_manager = new QNetworkAccessManager();
    reply = g_manager->get(request);

    QEventLoop loop;                                                                // 开启循环等待
    QObject::connect(&timer, &QTimer::timeout, &loop, &QEventLoop::quit);           // 超时则退出循环
    QObject::connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);    // 请求成功则退出循环
    QObject::connect(reply, &QNetworkReply::finished, [&]() {
        if (reply->error() != QNetworkReply::NoError) {       
            // 错误处理
            outPutMsg(QtDebugMsg, "WeldTool::downLoadFile Error String  = " + reply->errorString());
            outPutMsg(QtDebugMsg, "WeldTool::downLoadFile url  = " + url);
            return;
        }
        });
    QObject::connect(reply, SIGNAL(downloadProgress(qint64, qint64)), this, SLOT(slotDownLoadSpeed(qint64, qint64))); // 请求成功则退出循环
    QObject::connect(reply, &QNetworkReply::readyRead, [&]() {
        QByteArray bytes = reply->readAll();
        tempFile->write(bytes);
        tempFile->flush();
        loadFlag = true;
        });
    if (!strSavePath.isEmpty() && loadFlag) {
        tempFile = new QFile(strSavePath);
        // [1] 打开下载文件，如果打开文件出错，不进行下载
        if (!tempFile->open(QIODevice::WriteOnly | QIODevice::Truncate)) {
            tempFile->close();
            tempFile->deleteLater();
            outPutMsg(QtDebugMsg, "WeldTool::downLoadFile [错误] 打开文件出错: = " + strSavePath);
            return;
        }
    }
    loop.exec();                                                                    // 启动事件循环
    if(loadFlag){
        tempFile->close();
        tempFile->deleteLater();
    }    
}