How to download a file using HTTP with URL in QT?

[Gokulnathvc]

QUrl url = QUrl::fromUserInput(strUrl);
QFileInfo fileInfo(url.path());
QString fileName=fileInfo.fileName();
if (QFile::exists(fileName)) {
   QMessageBox::information(this, tr("HTTP"),
   tr("There already exists a file called %1 in "
   "the current directory.")
   .arg(fileName));
}
 
file = new QFile(fileName);
if (!file->open(QIODevice::WriteOnly)) {
QMessageBox::information(this, tr("HTTP"),
tr("Unable to save the file %1: %2.")
.arg(fileName).arg(file->errorString()));
delete file;
file = 0;
}
 
file.setFileName(fileName);
file.open(QIODevice::WriteOnly);
QHttp *http;
http=new QHttp(this);
setHost(url.host(),QHttp::ConnectionModeHttp);

QUrl url = QUrl::fromUserInput(strUrl);
QFileInfo fileInfo(url.path());
QString fileName=fileInfo.fileName();
if (QFile::exists(fileName)) {
   QMessageBox::information(this, tr("HTTP"),
   tr("There already exists a file called %1 in "
   "the current directory.")
   .arg(fileName));
}

file = new QFile(fileName);
if (!file->open(QIODevice::WriteOnly)) {
QMessageBox::information(this, tr("HTTP"),
tr("Unable to save the file %1: %2.")
.arg(fileName).arg(file->errorString()));
delete file;
file = 0;
}

file.setFileName(fileName);
file.open(QIODevice::WriteOnly);
QHttp *http;
http=new QHttp(this);
setHost(url.host(),QHttp::ConnectionModeHttp);

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Am getting while using the HTTP . It says undefined reference to the http object.
I just want to download a file from the host.