i am developing a simple application which uploads image to yfrog.com.(These images will be reflected in twitter account). Here is my code. but it is not working. I am not getting response from server.
QNetworkAccessManager *manager = new QNetworkAccessManager(this);
QNetworkRequest request(QUrl("http://yfrog.com/api/uploadAndPost"));
QByteArray data;
QUrl params,params1;
QFile file("some image path");
QString boundary("-----abcde12345");
QString body = "\r\n--" + boundary + "\r\n";
params.addQueryItem("username",twitterusername);
params.addQueryItem("password",twitterpassword);
params.addQueryItem("message",some message...);
params.addQueryItem("key",mydeveloperkey);
data.append(body);
data.append(params.toString());
QByteArray ba;
ba=file.readAll();
QString body1(ba);
params1.addQueryItem("media",body1);
data.append(params1.toString());
data.append(body);
request.setRawHeader("Content-Type","multipart/form-data; boundary=-----abcde12345");
request.setHeader(QNetworkRequest::ContentLengthHe ader,data.size());
QNetworkReply *reply = manager->post(request,data);
reply->waitForReadyRead(-1);
qDebug() << "replay :"<<reply->readAll();
If i checked the requested TCP packets from wireshark, it is giving a error message like 'malformed packets'.
For reference : http://code.google.com/p/imageshacka...GuploadAndPost
Please any body help regarding this. Where i am doing wrong?
QNetworkReply::waitForReadyRead does not have an implementation so it always refers the base class waitForReadyRead() (in this case QIODevice). In the base class, you will see that waitForReadyRead always returns FALSE.
From the docs, you would have to instead use the readRead() signal in QNetworkReply and read the data when the slot is called.
QNetworkReply *reply = manager->get(request);
connect(reply, SIGNAL(readyRead()), this, SLOT(slotReadyRead()));
Related
Using Qt 5.4 32-bit on Windows 8.1 (64-bit) with MingW.
I am experiencing a weird problem. Consider this:
//QString m_sUrl = "cloud.mysystem.info/";
//QString m_sFileName = "results.html";
//QNetworkAccessManager m_Manager;
QUrl url(m_sURL + m_sFileName);
url.setScheme("ftp");
url.setUserName(m_sLogin);
url.setPassword(m_sPassword);
QFile *file = new QFile(m_sFileName);
if(file->open(QIODevice::ReadOnly))
{
QNetworkReply *reply = m_Manager.put(QNetworkRequest(url), file);
connect(reply, static_cast<void (QNetworkReply::*)(QNetworkReply::NetworkError)>(&QNetworkReply::error), this, &OCMResults::error);
connect(reply, &QNetworkReply::finished, reply, &QObject::deleteLater);
connect(reply, &QNetworkReply::finished, file, &QObject::deleteLater);
}
else
file->deleteLater();
At first my code worked fine but then it stopped working (possibly due to my change, not sure what was it) and only workaround is when I write the url explicitely:
QNetworkReply(QUrl("ftp://" + m_sLogin + ":" + m_sPassword + "#" + m_sURL + m_sFileName)), file);
The resulting URL is exactly the same but for some reason when I create it beforehand and pass it to the QNetworkReply it does not take it:
reply.url().host()
yields nothing if that is the case for example. I feel like I am missing something really obvious here...
The errors are either:
3 (host not found) when ftp is specified in the url string
301 (unknown protocol) when I do not specify it in the url but specify it as setScheme("ftp") instead
Thanks!
I've got some class to interfere with HTTP-server.
Here is meaningfull code parts:
const QString someClass::BASEURL = QString("http://127.0.0.1:8000/?");
someClass::someClass():
manager(new QNetworkAccessManager(this))
{
}
QNetworkReply *someClass::run(QString request)
{
qDebug() << request;
QEventLoop loop;
QObject::connect(manager, SIGNAL(finished(QNetworkReply*)), &loop, SLOT(quit()));
QNetworkReply *res = manager->get(QNetworkRequest(QUrl(BASEURL + request)));
loop.exec();
return res;
}
When I call method run(), sometimes (not every time) the are two identical GET-requests
(I looked with tcpdump). qDebug() executes 1 time.
Is there some error in my code? I can't see any possible explanation.
UPDATE:
After some tcpdump ouptut research.
After second request it sends packet with RST flag as an answer to FIN.
But I still can see no difference in TCP-streams that triggers the problem and that doesn't.
F.e. here is wireshark's output. Stream 8 went well. Stream 11 was duplicated with Stream 12.
I'm stuck with this. Maybe it's some protocol errors from server-size, I'm not sure. Or maybe it's a bug in QNetworkAccessManager.
Have you tried rewriting you code to be more asynchronous without using QEventLoop in a local scope? Your code looks good to me, but there might be some weird QT bug that you running into in the way it queues up requests for processing and using QEventLoop in the local scope. I usually use QNetworkAccessManager in the following manner to send GET and POST requests:
void someClass::run(QString request)
{
qDebug() << request;
QObject::connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(on_request_complete(QNetworkReply*)));
QNetworkReply *res = manager->get(QNetworkRequest(QUrl(BASEURL + request)));
}
void someClass::on_request_complete(QNetworkReply* response)
{
// Do stuff with your response here
}
This is my program. In this program I want to send request to a website (for example: http://www.adobe.com/products/muse.html)
I want to show the html code that return me in plain text box.
QUrl url("http://www.adobe.com/products/muse.html")
I want to give html code in "thisfile"
file.setFileName("thisfile.html");
if (!file.open(QIODevice::WriteOnly))
{
std::cerr << "Error: Cannot write file "
<< qPrintable(file.fileName()) << ": "
<< qPrintable(file.errorString()) << std::endl
return false;
}
http.setHost(url.host(),80);
http.post(url.toString(),"term=yyyy&loc=en_us&siteSection=products%3Amuse",&file);
This code doesn't work correctly and when I show the file give me false html code. What do I have to do?
Use http.get() instead of http.post() as POST method requires to set other Headers used by server.
QHttp::get() method is asynchronous too.
As your case is simple enough just to retrieve HTML response, you should go for HTTP GET IMHO. See difference between GET and POST method.
And if you have to use HTTP POST only, then check this.
QNetworkRequest request;
request.setUrl(QUrl("thisfile.html"));
QNetworkReply *reply = manager->post(request, "term=yyyy&loc=en_us&siteSection=products%3Amuse");
connect(reply, SIGNAL(readyRead()), this, SLOT(slotReadyRead()));
Look at QNetworkAccessManager at qt docs
You have to read information and save it to file at readyRead function
I am trying to develop file uploader using Qt. Here is my code :
QNetworkAccessManager * manager = new QNetworkAccessManager(this);
QNetworkRequest request(url);
QByteArray line;
QFile file(//path);
while(!file.atEnd())
{
line.append(file.readLine());
}
file.close();
QObject::connect(manager,SIGNAL(finished(QNetworkReply *)), this, SLOT(error_On_File_Send(QNetworkReply *)));
manager->post(request, line);
it works ok for small files. But it is not working in large file and gives std:bad_alloc error. What should i do
Use QNetworkAccessManager::post ( const QNetworkRequest & request, QIODevice * data ). It will automaticly read data when it is needed from any QIODevice. QFile is QIODevice so you should only slightly change your code. Note that you have to manage attached QIODevice by yourself (delete it after finished() signal)
I'm using this code to make a simple HTTP Post ( a login )
QNetworkAccessManager *nwam = new QNetworkAccessManager;
QNetworkRequest request(QUrl("http://localhost/laptop/trylogin.php"));
QByteArray data;
QUrl params;
QString userString(user);
QString passString(pass);
params.addQueryItem("user", userString );
params.addQueryItem("pass", passString );
data.append(params.toString());
data.remove(0,1);
QNetworkReply *reply = nwam->post(request,data);
If the logging succeedes or not, how do i send and read the response in Qt ?
You get the response / reply in the reply pointer.
Use QNetworkReply::error() to see if there was an error.
You can catch reply signals cause it works with Signals and slots.. So you have to connect a slot to the signal httpreadyread emitted by reply and then read the reply by reply.readAll method.. READ qtnetwork module documentation..