Question

我正在尝试在qt中使用线程但我在使用的代码中遇到了一些奇怪的错误。

我正在使用线程的函数。

QThreadPool::globalInstance()->setMaxThreadCount(size);
QFutureSynchronizer<void> synchronizer;

for(quint64 i=0;i<size;i++)
{
    synchronizer.addFuture(QtConcurrent::run(this, &Market::tickerForThread,markets[permission[i]],QString("%1%2/value").arg(url).arg(permission[i])));
}
synchronizer.waitForFinished();

和fucntions

void Market::tickerForThread(QVariantMap &vMap,QString url)
{
    vMap=QJsonDocument::fromJson(getnetwork->getAction(url)).object().value("value").toObject().toVariantMap();
}

QByteArray GetNetwork::getAction(QString url)
{
    QEventLoop loop;
    QNetworkReply *reply=getNAM->get(QNetworkRequest(QUrl(url)));
    connect(reply,SIGNAL(finished()),&loop,SLOT(quit()));
    loop.exec();

        if(reply->error()!=QNetworkReply::NoError)
        {
            QString error=QString("Network Error file:%1 line:%2 error:%3")
                                 .arg(__FILE__)
                                 .arg(__LINE__)
                                 .arg(reply->errorString());

            emit errorOccured(error);

            return error.toLatin1();
        }

        return reply->readAll();
    }

和我得到的错误

QObject: Cannot create children for a parent that is in a different thread.
(Parent is QNetworkAccessManager(0xa64d80), parent's thread is QThread(0x6f9270), current thread is QThread(0xad4490)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QNetworkAccessManager(0xa64d80), parent's thread is QThread(0x6f9270), current thread is QThread(0xacc3c0)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QNetworkAccessManager(0xa64d80), parent's thread is QThread(0x6f9270), current thread is QThread(0xacbd90)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QNetworkAccessManager(0xa64d80), parent's thread is QThread(0x6f9270), current thread is QThread(0xad4b20)

错误的原因是什么？如何解决？谢谢你的回复。

Answer 1

错误的原因是什么？如何解决？

父母和孩子必须生活在同一个主题中。解决方案是将它们分别移动到同一个线程中。

您需要将QNAM实例移动到子线程，否则需要移动子项。如果没有明确的背景，我无法告诉你更具体的建议。

QObject：无法为QtConcurrent :: run的不同线程中的父级创建子级

1 个答案: