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

Question

1.00/5 (2 votes)

See more:

While using setHost statement, It retuns error "undefined reference".
How to download a file using HTTP with URL?

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);

Posted 7-Mar-11 1:30am

Gokulnath007

Updated 7-Mar-11 4:14am

HimanshuJoshi

v2

Add a Solution

Comments

HimanshuJoshi 7-Mar-11 10:15am

Edited to add <pre> tags around your code

2 solutions

Solution 1

The QHttp class used in your code is obsolete[^]. New code should use the QNetworkAccessManager[^] class instead. See the example code[^] in the Qt documentation.

Posted 7-Mar-11 12:39pm

markkuk

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Gokulnath007 · Accepted Answer · 2011-03-17T22:30:00

Simplest way to download from the HTTP is below::

connect(&http,SIGNAL(done(bool)),this,SLOT(httpdon e())); //added in the constructor..

In the header file......Make the following changes...

QHttp http;
QFile file;

private slots:

bool on_pushButton_clicked();
void httpdone();

signals:

void done();

in the Qthttp.cpp file...

bool QtHttp:n_pushButton_clicked()
{

QString strUrl="http://www.blabla.com//file";
QUrl url = QUrl::fromUserInput(strUrl);

QFileInfo fileInfo(url.path());
QString strhost=url.encodedHost();
QString filename=fileInfo.fileName();
file.setFileName("C:\\Qt\\QHttp\\"+filename);
http.setHost(url.host(),url.port(80));
http.get(url.path(),&file);

if(!file.open(QIODevice::WriteOnly))
{
QMessageBox::warning(NULL,"warning","file is not opened",QMessageBox::Ok);
}
file.write(http.readAll());
http.close();
return true;

}

void QtHttp::httpdone()
{

file.close();
Q_EMIT done();
}