How to use qml to download a file from http

xiazhouquan

I am new to QT.
I want to click a button in qml ,then download the file from http! I use below code in DownLoadFile.h
@
class CDownLoadFile: public QObject
{
Q_OBJECT
public:
explicit CDownLoadFile(QObject *parent=0);

signals:

public slots:
Q_INVOKABLE void downloadFile(QUrl url);
Q_INVOKABLE void fileIsReady( QNetworkReply * reply);
public--:
QUrl url;
QNetworkAccessManager manager;
QNetworkReply *preply;
QFile *file;
int httpGetId;
};
@

DownLoadFile.cpp
@
#include "DownLoadFile.h"
#include <QtGui>
#include <QtNetwork>

CDownLoadFile::CDownLoadFile(QObject *parent)
:QObject(parent)
{
manager=new QNetworkAccessManager(this);
}

void CDownLoadFile::downloadFile(QUrl url)
{
connect(manager, SIGNAL(finished()), this, SLOT(fileIsReady(QNetworkReply*)));
preply= manager->get(QNetworkRequest(url);
}

void CDownLoadFile::fileIsReady( QNetworkReply * preply)
{
QTemporaryFile temp_file;
temp_file.write(preply->readAll());
}
@

but when compile ,these probelm come ,I am not sure what is wrong!
../Reader/DownLoadFile.cpp: In constructor ‘CDownLoadFile::CDownLoadFile(QObject*)’:
../Reader/DownLoadFile.cpp:8: error: no match for ‘operator=’ in ‘((CDownLoadFile*)this)->CDownLoadFile::manager = (operator new(8u), (<statement>, ((QNetworkAccessManager*)<anonymous>)))’
../../NokiaQtSdk/Desktop/Qt/473/gcc/include/QtNetwork/qnetworkaccessmanager.h:72: note: candidates are: QNetworkAccessManager& QNetworkAccessManager::operator=(const QNetworkAccessManager&)
../Reader/DownLoadFile.cpp: In member function ‘void CDownLoadFile::downloadFile(QUrl)’:
../Reader/DownLoadFile.cpp:13: error: no matching function for call to ‘CDownLoadFile::connect(QNetworkAccessManager&, const char [12], CDownLoadFile* const, const char [29])’
../../NokiaQtSdk/Desktop/Qt/473/gcc/include/QtCore/qobject.h:198: note: candidates are: static bool QObject::connect(const QObject*, const char*, const QObject*, const char*, Qt::ConnectionType)
../../NokiaQtSdk/Desktop/Qt/473/gcc/include/QtCore/qobject.h:313: note: bool QObject::connect(const QObject*, const char*, const char*, Qt::ConnectionType) const
../Reader/DownLoadFile.cpp:14: error: base operand of ‘->’ has non-pointer type ‘QNetworkAccessManager’
../Reader/DownLoadFile.cpp:14: error: expected ‘)’ before ‘;’ token
make: *** [DownLoadFile.o] Error 1
make: Leaving directory `/home/administrator/qt/Reader-build-desktop'

Thank you !
My regards!

thisisbhaskar

The first problem I see is that
@QNetworkAccessManager manager;@
this should be
@QNetworkAccessManager *manager;@

leon.anavi

The wiki contains an example C++ code which shows "how to download content from HTTP":http://developer.qt.nokia.com/wiki/Download_Data_from_URL