void ImageLoader::onReplyFinished() { QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender()); QString response; if (reply) { if (reply->error() == QNetworkReply::NoError) { const int available = reply->bytesAvailable(); if (available > 0) { const QByteArray data(reply->readAll()); // Setup the image processing thread ImageProcessor *imageProcessor = new ImageProcessor(data); m_thread = new QThread(this); // Move the image processor to the worker thread imageProcessor->moveToThread(m_thread); // Invoke ImageProcessor's start() slot as soon as the worker thread has started connect(m_thread, SIGNAL(started()), imageProcessor, SLOT(start())); // Delete the worker thread automatically after it has finished connect(m_thread, SIGNAL(finished()), m_thread, SLOT(deleteLater())); /* * Invoke our onProcessingFinished slot after the processing has finished. * Since imageProcessor and 'this' are located in different threads we use 'QueuedConnection' to * allow a cross-thread boundary invocation. In this case the QImage parameter is copied in a thread-safe way * from the worker thread to the main thread. */ connect(imageProcessor, SIGNAL(finished(QImage)), this, SLOT(onImageProcessingFinished(QImage)), Qt::QueuedConnection); // Terminate the thread after the processing has finished connect(imageProcessor, SIGNAL(finished(QImage)), m_thread, SLOT(quit())); m_thread->start(); } } else { m_label = tr("Error: %1 status: %2").arg(reply->errorString(), reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toString()); emit labelChanged(); m_loading = false; emit loadingChanged(); } reply->deleteLater(); } else { m_label = tr("Download failed. Check internet connection"); emit labelChanged(); m_loading = false; emit loadingChanged(); } }
void ImageLoader::onReplyFinished() { QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender()); QString response; if (reply) { if (reply->error() == QNetworkReply::NoError) { const int available = reply->bytesAvailable(); if (available > 0) { const QByteArray data(reply->readAll()); // Setup the image processing thread ImageProcessor *imageProcessor = new ImageProcessor(data); QFuture<QImage> future = QtConcurrent::run(imageProcessor, &ImageProcessor::start); // Invoke our onProcessingFinished slot after the processing has finished. connect(&m_watcher, SIGNAL(finished()), this, SLOT(onImageProcessingFinished())); // starts watching the given future m_watcher.setFuture(future); } } else { m_loading = false; emit loadingChanged(); } reply->deleteLater(); } else { m_loading = false; emit loadingChanged(); } }