Why i can't send more then 1 http request in parallel in the same main thread
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From the docs:
Note: QNetworkAccessManager queues the requests it receives. The number of requests executed in parallel is dependent on the protocol. Currently, for the HTTP protocol on desktop platforms, 6 requests are executed in parallel for one host/port combination.And I think it would be better to use a single QNetworkAccessManager.
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i must doing here something wrong and i don't know , here some code .
there are 2 http post functions the first is simple post that invoked every 5 sec
and the second one is file upload post function that call in parallel.
when i call the file upload the first stops , whits until the file upload finished and continue this is come's from Qt with out my intervention .
this is with single QNetworkAccessManager@ //Init in the class contractor
networkManager = new QNetworkAccessManager(this);
connect(networkManager,SIGNAL(sslErrors(QNetworkReply*,QList<QSslError>)), this, SLOT(on_sslErr(QNetworkReply*,QList<QSslError>)));//-----------------------------------------------------\
//this is upload file code , its taking time untill it finish working great
PostImageRequest( QString& Response,
QMap<QString,QString> paramsToPostMap,
QString& BaseUrl,
QString imageFullPath,
int iTimeOutInterval)QByteArray imageFormat = QImageReader::imageFormat(imageFullPath);
QString imageMimeType(imageFormat);
QNetworkRequest request;
QUrl params;
QMapIterator<QString,QString> i(paramsToPostMap);
while (i.hasNext()) {
i.next();
addField(i.key(),i.value());
}addFile("file",imageFullPath,imageMimeType);
QString crlf="\r\n";
qsrand(QDateTime::currentDateTime().toTime_t());
QString b=QVariant(qrand()).toString()+QVariant(qrand()).toString()+QVariant(qrand()).toString();
QString boundary="---------------------------"+b;
QString endBoundary=crlf+"--"+boundary+"--"+crlf;
QString contentType="multipart/form-data; boundary="+boundary;
boundary="--"+boundary+crlf;
QByteArray bond=boundary.toAscii();
QByteArray send;
bool first=true;for (int i=0; i<fieldNames.size(); i++) {
send.append(bond);
if (first) {
boundary=crlf+boundary;
bond=boundary.toAscii();
first=false;
}
send.append(QString("Content-Disposition: form-data; name=""+fieldNames.at(i)+"""+crlf).toAscii());
if (encodingS=="utf-8") send.append(QString("Content-Transfer-Encoding: 8bit"+crlf).toAscii());
send.append(crlf.toAscii());
send.append(strToEnc(fieldValues.at(i)));
}
for (int i=0; i<files.size(); i++) {
send.append(bond);
send.append(QString("Content-Disposition: form-data; name=""+fileFieldNames.at(i)+""; filename=""+fileNames.at(i)+"""+crlf).toAscii());
send.append(QString("Content-Type: "+fileMimes.at(i)+crlf+crlf).toAscii());
send.append(files.at(i));
}send.append(endBoundary.toAscii());
fieldNames.clear();
fieldValues.clear();
fileFieldNames.clear();
fileNames.clear();
fileMimes.clear();
files.clear();
request.setHeader(QNetworkRequest::ContentTypeHeader, contentType.toAscii());
request.setHeader(QNetworkRequest::ContentLengthHeader, QVariant(send.size()).toString());
request.setUrl(BaseUrl);if(iTimeOutInterval != -1)
{
QEventLoop loop2;
QTimer::singleShot(iTimeOutInterval, &loop2, SLOT(quit()) );
loop2.exec();
}
QEventLoop loop;
QNetworkReply *reply = networkManager->post(request,send);
connect(reply, SIGNAL(uploadProgress(qint64,qint64)), this,SLOT(SetProgress(qint64,qint64)));
connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
loop.exec();
//return response
QNetworkReply::NetworkError networkError = reply->error();
HandleNetworkError(networkError);
Response.clear();
QByteArray data=reply->readAll();
Response.append(data);
//delete reply;
reply->deleteLater();//--------------------------------------------------------------------------------\
//this is the post function that invoket every 5 secoundPostRequest(QString& Response,
QMap<QString,QString> paramsToPostMap,
QString& BaseUrl,
int iTimeOutInterval)QNetworkRequest request;
QUrl params;
QMapIterator<QString,QString> i(paramsToPostMap);
while (i.hasNext()) {
i.next();
params.addQueryItem(i.key(),i.value());
}
request.setUrl(BaseUrl);QByteArray postArgs;
postArgs = params.encodedQuery();if(iTimeOutInterval != -1)
{
QEventLoop loop2;
QTimer::singleShot(iTimeOutInterval, &loop2, SLOT(quit()) );
loop2.exec();
}
QEventLoop loop;
QNetworkReply *reply = networkManager->post(request,postArgs);
connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
loop.exec();
//return response
QNetworkReply::NetworkError networkError = reply->error();
HandleNetworkError(networkError);
Response.clear();
QByteArray data=reply->readAll();
Response.append(data);//delete reply;
reply->deleteLater();@ -
I'm 99% sure that it's because you're using two QEventLoops (I don't know exactly why it's hapenning and it might have something to do with the code you use to call the second function ever 5 seconds). Therefore, yous should probably use two separate slots for handling the replies instead of the event loops.