[英]Reading large file from QNetworkReply to QFile? Streaming from QNetworkReply
[英]With QNetworkReply how can I post a file and then receive a converted file back from the server?
我可以使用QNetworkReply
, QNetworkAccessManager
, QNetworkRequest
等在Qt中将文件发布到服务器。 该服务器转换文件并将其吐回。 如何获得随身携带的文件? 我是否需要以某种方式找到从标头返回的文件的url,然后让QNetworkAccessManager
进行获取请求? 还是我可以从现有的QNetworkReply
信号中获取它并将其写入文件?
如果服务器响应请求而返回文件,那么您可以直接从返回的回复中读取文件:
QNetworkAccessManager nam;
QUrl url(QString("http://www.example.com"));
url.addQueryItem("parameter", "value");
QNetworkRequest request(url);
QNetworkReply *reply = nam.get(request);
QEventLoop eventloop;
connect(reply,SIGNAL(finished()),&eventloop,SLOT(quit()));
eventloop.exec();
if (reply->error() == QNetworkReply::NoError)
{
QByteArray bts = reply->readAll();
QFile file("path/to/file");
file.open(QIODevice::WriteOnly);
file.write(bts);
file.close();
}
您还可以通过将QNetworkAccessManager
的finished
信号连接到插槽并将文件写入那里,以异步方式进行操作:
connect(&nam,SIGNAL(finished(QNetworkReply*)),this,SLOT(onFinished(QNetworkReply*)));
void onFinished(QNetworkReply* reply)
{
if (reply->error() == QNetworkReply::NoError)
{
QByteArray bts = reply->readAll();
QFile file("path/to/file");
file.open(QIODevice::WriteOnly);
file.write(bts);
file.close();
}
}
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