TwitterRequest.cpp Example File

    /*
     * Copyright (c) 2011-2012 Research In Motion Limited.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    #include "TwitterRequest.hpp"

    #include <QNetworkAccessManager>
    #include <QNetworkReply>
    #include <QNetworkRequest>
    #include <QUrl>

    /*
     * Default constructor
     */
    TwitterRequest::TwitterRequest(QObject *parent)
        : QObject(parent)
    {
    }

    /*
     * TwitterRequest::requestTimeline(const QString &screenName)
     *
     * Makes a network call to retrieve the twitter feed for the specified screenname
     */
    void TwitterRequest::requestTimeline(const QString &screenName)
    {
        QNetworkAccessManager* networkAccessManager = new QNetworkAccessManager(this);

        const QString queryUri = QString::fromLatin1("http://api.twitter.com/1/statuses/user_timeline.json?include_entities=true&include_rts=true&screen_name=%1").arg(screenName);

        QNetworkRequest request(queryUri);

        QNetworkReply* reply = networkAccessManager->get(request);

        connect(reply, SIGNAL(finished()), this, SLOT(onTimelineReply()));
    }

    /*
     * TwitterRequest::onTimelineReply()
     *
     * Callback handler for QNetworkReply finished() signal
     */
    void TwitterRequest::onTimelineReply()
    {
        QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());

        QString response;
        bool success = false;
        if (reply) {
            if (reply->error() == QNetworkReply::NoError) {
                const int available = reply->bytesAvailable();
                if (available > 0) {
                    const QByteArray buffer = reply->readAll();
                    response = QString::fromUtf8(buffer);
                    success = true;
                }
            } else {
                response =  tr("Error: %1 status: %2").arg(reply->errorString(), reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toString());
            }

            reply->deleteLater();
        }

        if (response.trimmed().isEmpty()) {
            response = tr("Twitter request failed. Check internet connection");
        }

        emit complete(response, success);
    }