Re: [Cppcms-users] CppCMS and QT

[Frank E. <fra...@an...>]

hi artyom,

thank you very much - this worked in deed :)

regards

frank

Am 30.12.2010 22:10, schrieb Artyom:
>>
>> my actual problem is that i want to use the  QNetworkAccessManager in a
>> cppcms application object to perform an external  https call which is
>> required for an authentication to an external 3rd party  provider.
>> actually i do something like this in the cppcms application  object:
>>
>> QNetworkAccessManager * nmgr = new  QNetworkAccessManager();
>> QNetworkReply * nrep =  nmgr->get(QNetworkRequest(url));
>> if(!nrep->waitForReadyRead(30000))  {
>>       // read failed
>> } else {
>>       QByteArray json  = nrep->readAll();
>>       // do something with the json  data..
>> }
>>
>> when i run this i get the following runtime error from  qt:
>>
>> QObject::startTimer: QTimer can only be used with threads started  with
>> QThread
>>
>> this must originate inside the waitForReadyRead call  since the
>> QNetworkAccessManager works asynchronous..
>>
>> the problem  according to the error message must be that the thread is
>> not created  through QThread and therefore misses some supplemental data
>> which hinders  QTimer on working. so my first thought was to gt the
>> cppcms application  somehow inside a QThread. of course i have no idea if
>> that's possible at  all..
>
> I had found this:
>
> http://doc.trolltech.com/qq/qq27-responsive-guis.html#waitinginalocaleventloop
>
> Basically it is an example you may use as draft.
>
> You need to have QCoreApplication created.
>
> This simple example taken from Qt site works fine, even
> not from the main thread:
>
> #include<QNetworkAccessManager>
> #include<QNetworkReply>
> #include<QNetworkRequest>
> #include<QUrl>
> #include<QEventLoop>
> #include<QTimer>
> #include<QCoreApplication>
> #include<iostream>
>
>
> void *func(void *)
> {
>      QNetworkAccessManager manager;
>      QEventLoop q;
>      QTimer tT;
>
>      tT.setSingleShot(true);
>      QObject::connect(&tT, SIGNAL(timeout()),&q, SLOT(quit()));
>      QObject::connect(&manager, SIGNAL(finished(QNetworkReply*)),
>              &q, SLOT(quit()));
>      QNetworkReply *reply = manager.get(QNetworkRequest(
>                     QUrl("http://www.google.com")));
>
>      tT.start(5000); // 5s timeout
>      q.exec();
>
>      if(tT.isActive()){
>          // download complete
>          std::cout<<  reply->readAll().data()<<  std::endl;
>          tT.stop();
>      } else {
>          std::cout<<  "Timeout"<<  std::endl;
>          // timeout
>      }
>      return 0;
>
> }
>
>
> int main(int argc,char **argv)
> {
>      QCoreApplication app(argc,argv);
>      pthread_t pid;
>      pthread_create(&pid,0,func,0);
>      pthread_join(pid,0);
>
> }
>
> Best,
>    Artyom
>
>
>
>
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