I hava a problem of uploading .txt file to my java servlet server using Qt.
I spent 5 days on that and tried a lot of solutions. But none of them worked. Does anyone can help me?
The problem is that the Qt code can work without error. But the server didn't receive anything by the httprequest from Qt.
This is one solution in Qt:
QFile file("dataToSend.txt");
nam = new QNetworkAccessManager(this);
QObject::connect(nam, SIGNAL(finished(QNetworkReply*)),
this, SLOT(finishedSlot(QNetworkReply*)));
QNetworkRequest r(QUrl("http://localhost:9999/server"));
QString bound="---------------------------723690991551375881941828858";
QByteArray data(QString("--"+bound+"\r\n").toAscii());
data += QString("--" + bound + "\r\n").toAscii();
data += "Content-Disposition: form-data; name=\"file\"; filename=\""+file.fileName()+"\"\r\n";
data += "Content-Type: text/plain\r\n\r\n";
file.open(QIODevice::ReadOnly);
data += file.readAll();
data += "\r\n";
data += QString("--" + bound + "\r\n").toAscii();
r.setRawHeader(QString("Content-Type").toAscii(),QString("multipart/form-data; boundary=" + bound).toAscii());
r.setRawHeader(QString("Content-Length").toAscii(), QString::number(data.length()).toAscii());
reply = nam->post(r,data);
reply=nam->get(r);
This is another solution, it is not wokring neither:
nam = new QNetworkAccessManager(this);
QObject::connect(nam, SIGNAL(finished(QNetworkReply*)),
this, SLOT(finishedSlot(QNetworkReply*)));
QFile *file=new QFile("dataToSend.txt");
QNetworkRequest request(QUrl("http://localhost:9999/server"));
request.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-streamd");
if(!file->open(QIODevice::ReadOnly)){
qDebug("%s\n",qPrintable("can't open the file!"));
return;
}
// post data to server
reply= nam->post(request,file);
file->setParent(reply);
reply=nam->get(request);
you cannot post() something to a server and a line below do a get() expecting to see the file.
Usually you have to post, wait until post is finished, and than you can see modification..
here there are lots of link you can use to do things right
Related
I am confusing when I want to post a image file to server. With a clear post, I can just use QHttpMultiPart ,and it works fine. But this time I want to add some params, the server just don't get them.
I have searched for days , But no solution is found.
The code goes like this:
QUrl url("http://192.168.1.211/v1");
QUrlQuery query;
//following params are what i want to add
query.addQueryItem("app_name", "pc");
query.addQueryItem("ip", "192.168.1.110");
query.addQueryItem("dev_os","android");
query.addQueryItem("dev_os_ver","11.4.1");
query.addQueryItem("dev_model",testEquip);
query.addQueryItem("latitude","23.137466");
query.addQueryItem("longitude","113.352425");
query.addQueryItem("user_id","1");
query.addQueryItem("nickname","nick");
query.addQueryItem("sex","1");
query.addQueryItem("headimgurl","http://some.com/");
url.setQuery(query);
QNetworkRequest req;
req.setUrl(url);
req.setRawHeader("X-Api-Key","JDZBNH3HDFI823AISDU9SF32IRJ");
QHttpMultiPart *multiPart=new QHttpMultiPart(QHttpMultiPart::FormDataType);
QHttpPart imagePart;
imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/jpeg"));
imagePart.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"image\"; filename=\""+filename+"\""));
QFile *file=new QFile(path);
file->open(QIODevice::ReadOnly);
imagePart.setBodyDevice(file);
file->setParent(multiPart);
multiPart->append(imagePart);
QNetworkAccessManager *manager=new QNetworkAccessManager();
QNetworkReply *reply=manager->post(req,multiPart);
multiPart->setParent(reply);
The response code shows no params have been accessed. So what is the right way to add these params?
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!
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 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()));