QNetworkReply等待完成 [英] QNetworkReply wait for finished

问题描述

我正在使用Qt 4.6.3和以下无效代码

I am using Qt 4.6.3 and the following not-working code

QStringList userInfo;
QNetworkRequest netRequest(QUrl("http://api.stackoverflow.com/1.1/users/587532"));
QNetworkReply *netReply = netman->get(netRequest);

// from here onwards not working
netReply->waitForReadyRead(-1);
if (netReply->isFinished()==true)
{userInfo << do sth to reply;}
return userInfo;

此函数返回一个空的QStringList时，应用程序崩溃.如何等到请求完成后，再在一个功能之内处理回复

as this function returns an empty QStringList, the app crashes. How to wait until the request has finished and then process the reply within one function

推荐答案

您可以使用事件循环:

QEventLoop loop;
connect(netReply, SIGNAL(finished()), &loop, SLOT(quit()));
loop.exec();
// here you have done.

此外，您还应该考虑增加一些短于网络的超时时间(20s?).即使发生错误，我也不确定是否调用了finish.因此有可能您也已连接到错误信号.

Also you should consider adding some shorter then network timeout (20s?). I'm not sure if finished is called even if an error occured. So it is possible, that you have connect to error signal also.

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