qt ftp 文件下载

要使用QT实现FTP文件下载功能，你可以使用QNetworkAccessManager类。下面是一个使用QT的QNetworkAccessManager下载文件的示例代码：

QNetworkAccessManager *manager = new QNetworkAccessManager(this);
QUrl url("ftp://example.com/path/to/file.txt");
QNetworkRequest request(url);
QNetworkReply *reply = manager->get(request);

connect(reply, &QNetworkReply::finished, [=]() {
    if(reply->error() == QNetworkReply::NoError) {
        QFile file("local/path/to/save/file.txt");
        if(file.open(QIODevice::WriteOnly)) {
            file.write(reply->readAll());
            file.close();
            qDebug() << "File downloaded successfully!";
        }
    } else {
        qDebug() << "Error: " << reply->errorString();
    }
    reply->deleteLater();
});

请注意，你需要将"example.com/path/to/file.txt"替换为实际的FTP服务器地址和文件路径，将"local/path/to/save/file.txt"替换为你想要保存文件的本地路径。

这段代码首先创建了一个QNetworkAccessManager对象，并指定了要下载的文件的URL。然后，发送了一个GET请求，并连接了finished信号的槽函数。在槽函数中，我们首先检查是否有错误发生，如果没有错误，我们打开本地文件并将从网络回复中读取的数据写入到该文件中。最后，我们删除回复对象并输出相应的消息。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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