C++ ImageProcessor::start方法代码示例

/**
 * RatingsProcessor::onReplyFinished()
 *
 * Handler for the signal indicating the response for the previous network request.
 *
 * If the result was a success, it will start the thread of constructing the QImage object.
 */
void RatingsProcessor::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);

				/*
				 * 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);

				imageProcessor->start();
			}
		} else {
			if (reply->error() < 100) {
				m_loading = false;
				emit loadingChanged();
				showError("Please check your internet connection");
				return;
			}
			m_label =
					tr("Error: %1 status: %2").arg(reply->errorString(),
							reply->attribute(
									QNetworkRequest::HttpStatusCodeAttribute).toString());

			emit labelChanged();

			m_loading = false;
			emit loadingChanged();

			emit ratValueChanged();
		}

		reply->deleteLater();
	} else {
		m_label = tr("Download failed.");

		emit labelChanged();

		m_loading = false;
		emit loadingChanged();

		emit ratValueChanged();
	}
}