c++ - Qt中需要释放slot参数的资源吗？

Question

举个例子，看看这段代码:

QNetworkRequest request(mResultsURL); //our server with php-script

connect(mNetworkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(onUploadFinished(QNetworkReply*))); //This slot is used to debug the output of the server script
mNetworkManager->post(request,data);

以及对应的接收槽:

void MyApp::onUploadFinished(QNetworkReply *reply){

    QJsonObject root = QJsonDocument::fromJson(reply->readAll()).object();

    // do some work
}

所以我的问题是:我需要添加吗

delete reply;

到函数结束？还是由 Qt 自动处理？

Answer 1

根据docs ，您需要释放资源，但不能删除槽内的回复。您需要调用deleteLater()相反:

Note: After the request has finished, it is the responsibility of the user to delete the QNetworkReply object at an appropriate time. Do not directly delete it inside the slot connected to finished(). You can use the deleteLater() function.

[...]

Note: Do not delete the reply object in the slot connected to this signal. Use deleteLater().