我如何知道QNetWorkReped来自哪个代理?

Question

这是一个HTTP请求发送方法。当目标网站响应时，将调用httpDone((。

void HTTPClientBase:: HttpRequestGet()
{
network_manager.setProxy(proxy);
QNetworkRequest network_request;
network_request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
network_request.setUrl(URL);

reply = network_manager.get(network_request);
connect(reply, SIGNAL(finished(QNetWorkReply*)), this, SLOT(httpFinished(QNetWorkReply*)));
}
void HTTPClientBase::httpFinished(QNetWorkReply* reply)
{
// How do I know this reply comes from which proxy?
}

我可以在循环中调用 HttpRequestGet((。

static HTTPClientBase myClient;
for(int i=0; i<20; i++)
{
myClient.setUrl("https:\www.google.com");
myClient.setProxy("123.123.123.123:1234"); // The proxy changes every time in this loop.
myClient.HttpRequestGet();
}

调用HTTPClientBase::httpFinished(QNetWorkReply* reply)时，我如何知道此回复来自哪个代理？ }

Answer 1

根据 QNetworkReply 文档，您可以使用成员函数 QNetworkReply：：request(( 获取相应的请求。

反正QNetworkRequest没有setProxy的成员功能。

但是如果你正在为QNetworkAccessManager设置代理，你可以通过QNetworkReply：：manager((有一个指向相应管理器的指针。

请注意连接命令。finished()没有QNetworkReply*参数，因此您的connect命令也将失败，您必须HTTPClientBase::httpFinished(QNetWorkReply* reply)更改为HTTPClientBase::httpFinished()。

...
connect(reply, SIGNAL(finished()), this, 
SLOT(httpFinished()));
}
void HTTPClientBase::httpFinished()
{
QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
if(reply){
QNetworkAccessManager * manager = reply->manager();
QNetworkProxy proxy = manager->proxy();
// now you have the proxy 
}
}

如您所见，您必须使用 sender(( 来获取实际的信号发送器。 您需要为您拥有的每个代理创建不同的QNetworkAccessManager实例。如果您有代理池，请先创建 QNetworkAccessManager 实例，然后根据您的特定需求进行选择。

如果你不想为每个代理创建一个新的QNetworkAccessManager，你可以这样做：

void HTTPClientBase:: HttpRequestGet()
{
network_manager.setProxy(proxy);
QNetworkRequest network_request;
network_request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
network_request.setUrl(URL);
reply = network_manager.get(network_request);
//new member variable: QHash<QNetworkReply*,QString> m_RequestToProxy;
m_RequestToProxy.insert(reply,proxy);
connect(reply, SIGNAL(finished()), this, SLOT(httpFinished()));
}
void HTTPClientBase::httpFinished()
{
QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
if(reply){
QString proxy = m_RequestToProxy.take(reply);
//check if proxy is valid
//and then do whatever you want
}
}

另一个更好的解决方案是设置回复属性并将其放入插槽中。

void HTTPClientBase:: HttpRequestGet()
{
network_manager.setProxy(proxy);
QNetworkRequest network_request;
network_request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
network_request.setUrl(URL);
reply = network_manager.get(network_request);
reply->setProperty("_proxy_",proxy);
connect(reply, SIGNAL(finished()), this, SLOT(httpFinished()));
}
void HTTPClientBase::httpFinished()
{
QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
if(reply){
QVariant v_proxy = reply->property("_proxy_");
//check if proxy is valid
if(v_proxy.isValid()){
QString proxy = v_proxy.toString();
//and then do whatever you want
}
}
}