QHttpMultiPart send post request results in "1" - c++

Question

I am currently using QHttpMultiPart in a Qt Project, but it seems to have some problems on my end ?
I have followed the example and came up with the following code:
#include "uploader.h"
#include <QFileInfo>
#include <QMimeDatabase>
#include <QHttpMultiPart>
#include <QNetworkReply>
#include <QDebug>
/**
* #brief Uploader::Uploader
* #param parent
*/
Uploader::Uploader(QObject *parent) :
QObject(parent)
{
uploadInProgress = false;
}
/**
* #brief Uploader::upload
* #param absoluteFilePath
*/
void Uploader::upload(QString absoluteFilePath)
{
qDebug() << "Upload Starting";
QFileInfo fileInfo(absoluteFilePath);
QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
//action part
QHttpPart textPart;
textPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"cmd\""));
textPart.setBody(QString("wFile").toLatin1());
//File Path
QHttpPart filePathPart;
filePathPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"file_path\""));
filePathPart.setBody(absoluteFilePath.toLatin1());
//filepart
QHttpPart filePart;
QMimeDatabase db;
QMimeType mime = db.mimeTypeForFile(absoluteFilePath);
filePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant(mime.name()));
filePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"preview_file\"; filename=\""+ fileInfo.baseName() + "\""));
QFile *file = new QFile(absoluteFilePath);
if ( !file->exists() )
{
qDebug() << "File Does not exist";
}
file->open(QIODevice::ReadOnly);
filePart.setBodyDevice(file);
file->setParent(multiPart); // we cannot delete the file now, so delete it with the multiPart
multiPart->append(textPart);
multiPart->append(filePathPart);
multiPart->append(filePart);
QUrl url("http://project.dbz.dev/index.php?controller=wapi&action=handle");
QNetworkRequest request(url);
pManager = new QNetworkAccessManager();
pReply = pManager->post(request, multiPart);
multiPart->setParent(pReply);
connect(pReply, SIGNAL(uploadProgress(qint64,qint64)),this,SLOT(uploadProgress(qint64,qint64)));
connect(pReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(onError(QNetworkReply::NetworkError)));
connect(pReply, SIGNAL(finished()),this, SLOT(uploadFinished()));
// here connect signals etc.
uploadInProgress = true;
}
/**
* #brief Uploader::uploadFinished
*/
void Uploader::uploadFinished()
{
QString data = (QString) pReply->readAll();
qDebug() << data;
qDebug() << "Upload finished";
uploadInProgress = false;
if ( pReply->error() > 0 )
{
qDebug() << "Error occured: " << pReply->error() << " : " << pReply->errorString();
}
else
{
qDebug() << "Upload success";
}
delete pReply;
}
void Uploader::uploadProgress(qint64 a, qint64 b)
{
qDebug() << " SOME PROGRESS!";
qDebug() << a << "/" << b;
}
void Uploader::onError(QNetworkReply::NetworkError err)
{
qDebug() << " SOME ERROR!";
qDebug() << err;
}
Sadly, none of the SLOTS are triggered from the SIGNALS. Neither can I see a package send with wireshark on my local ethernet adapter.
However, my Apache does get a request:
192.168.178.21 - - [21/Sep/2013:05:10:41 +0200] "POST /index.php?controller=wapi&action=handle HTTP/1.1" 200 166 "-" "Mozilla/5.0"
And in my PHP Application I have the following outcome:
Application_Controller_WapiController::handleAction: Command: wFile
Application_Controller_WapiController::wFile: POST Request: 1
This, basically means, it recognises the Parameter "cmd" and the value "wFile", opens the according PHP action which then does a print_r($_POST) which shows me nothing more than a simple 1.
I have no idea what to do. I have looked everywhere on the internet and cannot seem to figure it out. I followed all examples and descriptions on the official documentary and found a couple of threads here on SO. There seemed to be a bug with the QHttpMultiPart class, although it was fixed with the major 5.0.0 update.
tl;dr:
connect(pReply, SIGNAL(uploadProgress(qint64,qint64)),this,SLOT(uploadProgress(qint64,qint64)));
connect(pReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(onError(QNetworkReply::NetworkError)));
connect(pReply, SIGNAL(finished()),this, SLOT(uploadFinished()));
These signals are not being triggered, PHP print_r shows me a 1 and I cannot track the POST request on my machine.
It would be nice if somebody could tell me why the SIGNALS are not emitted and more importantly how I can see a final version of my POST request in my C++ application before it is sent.
Thank you very much! I appreciate any help!

Answer 1

I have solved the problem by adding:
pELoop = new QEventLoop();
pELoop->exec();
Which results into this:
#include "uploader.h"
#include <QFileInfo>
#include <QMimeDatabase>
#include <QHttpMultiPart>
#include <QNetworkReply>
#include <QDebug>
/**
* #brief Uploader::Uploader
* #param parent
*/
Uploader::Uploader(QObject *parent) :
QObject(parent)
{
uploadInProgress = false;
}
/**
* #brief Uploader::upload
* #param absoluteFilePath
*/
void Uploader::upload(QString absoluteFilePath)
{
qDebug() << "Upload Starting";
QFileInfo fileInfo(absoluteFilePath);
QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
//action part
QHttpPart textPart;
textPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"cmd\""));
textPart.setBody(QString("wFile").toLatin1());
//File Path
QHttpPart filePathPart;
filePathPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"file_path\""));
filePathPart.setBody(absoluteFilePath.toLatin1());
//filepart
QHttpPart filePart;
QMimeDatabase db;
QMimeType mime = db.mimeTypeForFile(absoluteFilePath);
filePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant(mime.name()));
filePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"preview_file\"; filename=\""+ fileInfo.baseName() + "\""));
QFile *file = new QFile(absoluteFilePath);
if ( !file->exists() )
{
qDebug() << "File Does not exist";
}
file->open(QIODevice::ReadOnly);
filePart.setBodyDevice(file);
file->setParent(multiPart); // we cannot delete the file now, so delete it with the multiPart
multiPart->append(textPart);
multiPart->append(filePathPart);
multiPart->append(filePart);
QUrl url("http://encryptor.dbz.dev/index.php?controller=wapi&action=handle");
QNetworkRequest request(url);
pManager = new QNetworkAccessManager();
pReply = pManager->post(request, multiPart);
multiPart->setParent(pReply);
pELoop = new QEventLoop();
connect(pReply, SIGNAL(uploadProgress(qint64,qint64)),this,SLOT(uploadProgress(qint64,qint64)));
connect(pReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(onError(QNetworkReply::NetworkError)));
connect(pReply, SIGNAL(finished()),this, SLOT(uploadFinished()));
pELoop->exec();
// here connect signals etc.
uploadInProgress = true;
}
/**
* #brief Uploader::uploadFinished
*/
void Uploader::uploadFinished()
{
QString data = (QString) pReply->readAll();
qDebug() << data;
qDebug() << "Upload finished";
uploadInProgress = false;
if ( pReply->error() > 0 )
{
qDebug() << "Error occured: " << pReply->error() << " : " << pReply->errorString();
}
else
{
qDebug() << "Upload success";
}
pReply->deleteLater();
pELoop->exit();
}
void Uploader::uploadProgress(qint64 a, qint64 b)
{
qDebug() << " SOME PROGRESS!";
qDebug() << a << "/" << b;
}
void Uploader::onError(QNetworkReply::NetworkError err)
{
qDebug() << " SOME ERROR!";
qDebug() << err;
}
The request is executed as expected, and the signals are working as well.
I get the output of:
Upload Starting
SOME PROGRESS!
16384 / 483753
SOME PROGRESS!
483753 / 483753
SOME PROGRESS!
0 / 0
"Array
(
[controller] => wapi
[action] => handle
[cmd] => wFile
[file_path] => D:/Downloads/putty.exe
)
{"cmd":"","status":"","message":"","params":[]}"
Upload finished
Upload success
I leave this hear in case somebody is looking for a working example.