线程中的网络请求使我的应用程序崩溃

Question

目前我有一段代码正在崩溃 (SEGFAULT)。

我正在尝试将我驱动器中的大量图像与服务器中的对应部分进行比较。

为了加快处理速度，我从服务器获取图像并在不同线程上比较图像。

从我已经尝试和调试的内容来看，问题在于从服务器获取图像（这就是其他调用被注释掉的原因）。

此外，如果我运行没有 QtConcurrent::运行 它不会崩溃，但是如果我把信号量 concurrentComparisons只有一个资源，它会崩溃。

最后我也得到以下错误

QObject::connect: Cannot connect (null)::configurationAdded(QNetworkConfiguration) to QNetworkConfigurationManager::configurationAdded(QNetworkConfiguration)
QObject::connect: Cannot connect (null)::configurationRemoved(QNetworkConfiguration) to QNetworkConfigurationManager::configurationRemoved(QNetworkConfiguration)
QObject::connect: Cannot connect (null)::configurationChanged(QNetworkConfiguration) to QNetworkConfigurationManager::configurationChanged(QNetworkConfiguration)
QObject::connect: Cannot connect (null)::onlineStateChanged(bool) to QNetworkConfigurationManager::onlineStateChanged(bool)
QObject::connect: Cannot connect (null)::configurationUpdateComplete() to QNetworkConfigurationManager::updateCompleted()

任何帮助将不胜感激.....

相关代码：

QSemaphore FileComparisonInfo::concurrentComparisons(1);

QtConcurrent::run( [this, localPath, imageURL]()
{
  ImageComparer cmp;

  FileComparisonInfo::concurrentComparisons.acquire();

  //cmp.setImageLeftPath(localPath);
  cmp.setImageRightPath(imageURL);
  //cmp.createDifferenceImage();

  FileComparisonInfo::concurrentComparisons.release();
});

void ImageComparer::setImageRightPath(QString path)
{
    this->rightImagePath = path;
    this->imageRight = getImage(path);
}

QImage* ImageComparer::getImage(QString path)
{
    QUrl url(path);
    QFile file(path);

    if(file.exists())
    {
        return new QImage(path);
    }
    else if(url.isValid())
    {
        return getImageFromURL(path);
    }
}

QImage* ImageComparer::getImageFromURL(QString url)
{

    QNetworkAccessManager * tempNAM = new QNetworkAccessManager();
    QNetworkReply *imageConnection = tempNAM->get( QNetworkRequest( QUrl( url ) ));

    QEventLoop loop;
    connect(imageConnection, SIGNAL(finished()), &loop, SLOT(quit()));
    loop.exec();

    QImage * downloadedImage;
    if(imageConnection->error() != QNetworkReply::NoError)
    {
        qDebug() << imageConnection->errorString();
        downloadedImage = new QImage();
    }
    else
    {
        QByteArray data = imageConnection->readAll();
        downloadedImage = new QImage(QImage::fromData(data));
    }

    tempNAM->deleteLater();
    imageConnection->deleteLater();

    return downloadedImage;
}

Answer 1

很遗憾，这与代码无关。

其中一个图像已损坏并且在比较中出现段错误。

线程中的网络请求使我的应用程序崩溃

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