我如何知道哪个 QNetworkReply 属于异步设计中的 QNetworkRequest? [英] How do I know which QNetworkReply belong to the QNetworkRequest in async design?

问题描述

我可以在 C# 中轻松获得异步设计

I can easily get async design in C#

HttpResponseMessage response = await httpClient.GetAsync(InputAddress.Text);
{
    ....// run when request finished. And response closely relation to request.
}

但是我怎样才能在 QT 中做到这一点呢?我在下面找到了一些代码.但仍有一些问题.

But how can I do that in QT? I find some codes below. But still some questions.

1. 为什么(sentReply == reply) 可以判断是否相同?也许我可以发送两次相同的请求，请求 A，请求 B.对应的响应是 A',B'.但响应到达顺序 B'，A'.代码是否有效?

2. 如果我想在请求完成时运行一些代码(如上面的 c# 代码)，我该怎么做?我想我可以为每个请求绑定一个 UUID 或者绑定一个回调函数指针来请求?最好的方法是什么?

1. Why does (sentReply == reply) can determine whether it is identical or not? Maybe I can send the same request twice,request A,requst B. Corresponding response is A',B'. but the responses arrive followed order B',A'. The code work or not?

2. If I want run some code when request finished(like c# code above), How can I do that? I think I can bind a UUID to each request or bind a call back function pointer to request? what is the best way to do that?

QNetworkAccessManager *manager=new QNetworkAccessManager(this);
connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(requestFinished(QNetworkReply*)));
QNetworkRequest request(QUrl(serverUrl));
QNetworkReply *sentReply = manager->post(request, buffer.toUtf8());

void requestFinished(QNetworkReply *reply)
{
    QByteArray msg = reply->readAll();
    if (sentReply == reply)
    qDebug("this is it");
}

推荐答案

我建议如下:

使用动态属性将自定义属性添加到 QNetworkReply.在完成的 Slot 中，您可以访问它们并调用相应的方法.

Add a custom Property to the QNetworkReply by using dynamic properties. In the finished Slot you can access them and call the corresponding method.

示例:

QNetworkReply *reply =  
networkAccessManager->get(QNetworkRequest(QUrl("http://url.com"));
reply->setProperty("login", QVariant("logindata");

connect(reply, SIGNAL(finished()), this, SLOT(replyFinished()));

replyFinished slot:

replyFinished slot:

QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender());

if (reply) {
    if (reply->error() == QNetworkReply::NoError) {
        QString myCustomData = reply->property("login").toString();

        if(myCustomData =="logindata")
            //do something

    }

    reply->deleteLater();
}

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