Question

我已有用于固件更新的C++/Qt源代码。 HTTP客户端用于下载文件。

如果我提供http://<path to file>，则这段代码可以正常工作但是 http 客户端无法从ftp://<path to down load>下载。 ftp显示下载的文件大小为零。

按照StackOverflow，它对两个都适用。我尝试使用setScheme("ftp")和其他小的更改。但是不起作用。

void HttpClient::onDownloadProgress(qint64 bytesReceived,
                                        qint64 bytesTotal)
{
    emit downloadUpdateProgress(
        static_cast<int>((bytesReceived * 1.0f / bytesTotal * 1.0f) * 100));
}

void HttpClient::onReadyRead()
{
    auto reply = qobject_cast<QNetworkReply *>(QObject::sender());
    if (reply) {
        QNetworkRequest request(reply->request());
        auto device = qobject_cast<QIODevice *>(request.originatingObject());
        if (device) {
            device->write(reply->readAll());
        }
    }
}

bool HttpClient::post(const QUrl &url, const QByteArray &data,
                          QIODevice *device)
{

    QNetworkRequest request(url);
    request.setHeader(QNetworkRequest::ContentTypeHeader,
                      "application/x-www-form-urlencoded");
    request.setAttribute(QNetworkRequest::CacheLoadControlAttribute,
                         QNetworkRequest::AlwaysNetwork);
    request.setSslConfiguration(getSslConfig());
    request.setOriginatingObject(device);

    QNetworkReply *reply = _networkAccessManager->post(request, data);
    connect(reply, &QNetworkReply::readyRead, this, &HttpClientImpl::onReadyRead);

    bool result = waitForFinished(reply, 30 * 1000);
    return result;
}

bool HttpClientImpl::get(const QUrl &url, QIODevice *device) 
{
    QNetworkRequest request(url);
    request.setSslConfiguration(getSslConfig());
    request.setOriginatingObject(device);

    QNetworkReply *reply = _networkAccessManager->get(request);
    connect(reply, &QNetworkReply::downloadProgress, this,
            &HttpClientImpl::onDownloadProgress);
    connect(reply, &QNetworkReply::readyRead, this, &HttpClientImpl::onReadyRead);

    bool result = waitForFinished(reply);
    return result;
}

它应该下载正确的文件大小。

从ftp服务器使用http客户端下载文件

0 个答案: