Downloading file from Url

[glararan]

Hi, i trying using from Qt example http a download file functions... without GUI. Just after opening program auto download from URL.

My edited code:
@#include <QtNetwork>
#include <QtGui>
#include <QDebug>

#include "Utils.h"

Download::Download()
{

}

void Download::startRequest(QUrl url)
{
netReply = netManager.get(QNetworkRequest(url));

connect(netReply, SIGNAL(finished()), this, SLOT(slot_downloadFinished()));
connect(netReply, SIGNAL(readyRead()), this, SLOT(slot_downloadReady()));

}

void Download::downloadFile(const QUrl &Url, const QString &dir)
{
url = Url;

QFileInfo fileInfo(url.path());
QString fileName = fileInfo.fileName();
if(fileName.isEmpty())
    fileName = "unknown.file";

if(!dir.isNull())
    fileName = dir + "//" + fileName;

if(QFile::exists(fileName))
{
    int i = 0;
    fileName += ".";

    while(QFile::exists(fileName + QString::number(i)))
        ++i;

    fileName += QString::number(i);
}

file = new QFile(fileName);
if(!file->open(QIODevice::WriteOnly))
{
    delete file;
    file = 0;
    return;
}

httpRequest = false;
startRequest(url);

}

// Download Slots
void Download::slot_downloadFinished()
{
if(httpRequest)
{
if(file)
{
file->close();
file->remove();
delete file;
file = 0;
}

    netReply->deleteLater();
    return;
}

file->flush();
file->close();

QVariant redirTar = netReply->attribute(QNetworkRequest::RedirectionTargetAttribute);
if(netReply->error())
    file->remove();
else if(!redirTar.isNull())
{
    qDebug() << "Using redirTar";

    QUrl Url2 = url.resolved(redirTar.toUrl());
    url = Url2;
    netReply->deleteLater();
    file->open(QIODevice::WriteOnly);
    file->resize(0);
    startRequest(url);

    return;
}

netReply->deleteLater();
netReply = 0;
delete file;
file = 0;

}

void Download::slot_downloadReady()
{
if(file)
file->write(netReply->readAll());
}@

It download file but is empty :( I dont know why. I try using "Run as Administrator" but without changes.

I calling "downloadFile" for download.,

OS: Win 7
Ver: 4.8.1

[leon.anavi]

A simple example how to "download a file for URL is available at our wiki":http://qt-project.org/wiki/Download_Data_from_URL.

[glararan]

You posted download for images... :D i need for all files.

[koahnig]

[quote author="glararan" date="1335697602"]You posted download for images... :D i need for all files.[/quote]
Did you try to use for another file extension?
See, if it works. If not, you may post the error messages and ask for advise.

[leon.anavi]

[quote author="glararan" date="1335697602"]You posted download for images... :D i need for all files.[/quote]

No, class FileDownloader works for all kind of files because the content is downloaded as QByteArray.

[glararan]

And can you show me how it is for .txt file? I have no idea.

[leon.anavi]

[quote author="glararan" date="1335706829"]And can you show me how it is for .txt file? I have no idea.[/quote]

Just write the content of the QByteArray to a file. You should do something like this:
@
QFile file("myfile.txt");
file.open(QIODevice::WriteOnly);
QDataStream out(&file);
out << yourByteArray;
@

[A Former User]

Are you actually calling QCoreApplication::exec somewhere? You need an event loop to process the network code.

Without it you will create the file, set up everything and then just quit before Qt ever has a chance to receive/process data from the network by calling your slots.