From Forum Nokia Wiki

ID	CS001431	Creation date	June 16, 2009
Platform	S60 3rd Edition, FP1, FP2 S60 5th Edition	Tested on devices	Nokia 5800 XpressMusic
Category	Qt for Symbian	Subcategory	Networking

Keywords (APIs, classes, methods, functions): QNetworkAccessManager, QUrl, QNetworkReply, QNetworkRequest

Overview

This code snippet demonstrates how to use QNetworkAccessManager for sending an HTTP request.

Note: In order to use this code, you need to have Qt for S60 installed on your platform.

Preconditions

• Install latest Qt for S60 see Qt for S60 - Installation packages
• Check this link for installation guide: How to install the package.
• Go through this article: Getting started with Qt for S60

Header

#include <QNetworkAccessManager>
#include <QUrl>
#include <QNetworkRequest>
#include <QNetworkReply>
 
QNetworkAccessManager* nam;

Source

Create QNetworkAccessManager and start listening for its finished signal.

nam = new QNetworkAccessManager(this);
QObject::connect(nam, SIGNAL(finished(QNetworkReply*)),
         this, SLOT(finishedSlot(QNetworkReply*)));

HTTP GET request:

QUrl url("http://www.forum.nokia.wiki");
QNetworkReply* reply = nam->get(QNetworkRequest(url));
// NOTE: Store QNetworkReply pointer (maybe into caller). 
// When this HTTP request is finished you will receive this same 
// QNetworkReply as response parameter. 
// By the QNetworkReply pointer you can identify request and response.

When the QNetworkAccessManager::finished signal is received, the HTTP request is completed.

void MyHttpEngine::finishedSlot(QNetworkReply* reply)
{   
    // Reading attributes of the reply
    // e.g. the HTTP status code
    QVariant statusCodeV = 
    reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
    // Or the target URL if it was a redirect:
    QVariant redirectionTargetUrl =
    reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
    // see CS001432 on how to handle this
 
    // no error received?
    if (reply->error() == QNetworkReply::NoError)
    {
        // read data from QNetworkReply here
 
        // Example 1: Creating QImage from the reply
        QImageReader imageReader(reply);
        QImage pic = imageReader.read();
 
        // Example 2: Reading bytes form the reply
        QByteArray bytes = reply.readAll();  // bytes
        QString string(bytes); // string
    }
    // Some http error received
    else
    {
        // handle errors here
    }
 
    // We receive ownership of the reply object
    // and therefore need to handle deletion.
    delete reply;
}

See also

• For more information about QNetworkAccessManager, see QNetworkAccessManager Class Reference
• CS001432 - Handling an HTTP redirect with QNetworkAccessManager

Postconditions

An HTTP response is received.