重置QNetworkAccessManager后端的方法 [英] Method to reset the QNetworkAccessManager backend

问题描述

看来如果ftp服务器需要验证，QNetworkAccessManager不能处理ftp检索到的缺失文件。

情况是这样的：
我从同一个ftp服务器下载多个文件，需要用户名和密码。我成功下载了几个文件，然后为不存在的文件发送GET。该请求报告失败。然后，我发送一个GET请求，申请一个应该有效的文件。该请求永远不会发出完成信号或错误。

Qt 4.7.4

请帮忙！这让我疯狂。我认为如果我可以以某种方式重置ftp后端，这个问题可能是可以解决的。 您正在连接 QNetworkReply signal finished（）像这样：

  QObject :: connect（reply，SIGNAL（finished（）），netty，SLOT（finished（）））; 
  

请尝试从 QNetworkAccessManager 像这样：

  connect（& network，SIGNAL（已完成（QNetworkReply *）），netty，SLOT（已完成（QNetworkReply * ）））; 
  

请注意，您必须更改完成（）插槽的原型。

最后一个方法是设置一个调用如下函数的计时器：

  void check（QNetworkReply * reply）{
 if（reply！= NULL）{
 if（reply-> isFinished（））
 finished（reply）; 
 else 
 reply-> abort（）; 
} 
} 
  

并注意这个错误：

https：//bugreports.qt-project。 org / browse / QTBUG-3443

It seems that QNetworkAccessManager does not handle missing files retrieved by ftp if the ftp server requires authentication.

The situation is this: I'm downloading multiple files from the same ftp server that requires username and password. I successfully download a few files then send a GET for a file that does not exist. That request reports failure. I then send a GET request for a file that should be valid. That request never emits a finished signal or error.

Qt 4.7.4

Please help! This is driving me nuts. I think that if I can somehow reset the ftp backend, this problem might be solvable.

解决方案

You are connecting the QNetworkReply signal finished() like this:

QObject::connect(reply, SIGNAL(finished()), netty, SLOT(finished()));

Instead try the finished signal from the QNetworkAccessManager like this:

connect(&network, SIGNAL(finished(QNetworkReply *)), netty, SLOT(finished(QNetworkReply *)));

Note that you will have to change the prototype for your finished() slot.

A final method would be to set a timer that calls a function like this:

void check(QNetworkReply *reply){
 if(reply != NULL){
   if(reply->isFinished())
     finished(reply);
   else
     reply->abort();
 }
}

And be aware of this bug:

https://bugreports.qt-project.org/browse/QTBUG-3443

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