Creating a QTcpSocket or a QTcpServer in a thread other than the main thread.

[wysota]

I have discovered that QTcpSocket and QTcpServer has to be created in main thread in order to function properly.

No, this is false. The socket has to have affinity with a thread with a running event loop to function properly or it needs to use the family of waitFor*() methods if not event loop is available.

Do you know how to use QNetworkAccessManager with QEventLoop other than the one in the main thread?

#include <QtGui>                                       
#include <QtNetwork>                                          
 
class Thread : public QThread {
  Q_OBJECT                     
public:                        
  Thread() : QThread(){ manager = 0; }
  ~Thread() { delete manager; }       
  void run(){                         
    manager = new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(processReply(QNetworkReply*)));
    QTimer::singleShot(0, this, SLOT(process()));                                                
    exec();                                                                                      
  }                                                                                              
public slots:                                                                                    
  void process(){
    QNetworkReply *reply = manager->get(QNetworkRequest(QUrl("http://www.qtcentre.org/")));
    QTimer::singleShot(5000, this, SLOT(process()));
  }
  void processReply(QNetworkReply *reply){
    qDebug() << reply->size();
    reply->deleteLater();
  }
private:
  QNetworkAccessManager *manager;
};
 
#include "main.moc"
 
int main(int argc, char **argv){
  QApplication app(argc, argv);
  Thread thread;
  thread.moveToThread(&thread);
  thread.start();
  return app.exec();
}

#include <QtGui>                                       
#include <QtNetwork>                                          

class Thread : public QThread {
  Q_OBJECT                     
public:                        
  Thread() : QThread(){ manager = 0; }
  ~Thread() { delete manager; }       
  void run(){                         
    manager = new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(processReply(QNetworkReply*)));
    QTimer::singleShot(0, this, SLOT(process()));                                                
    exec();                                                                                      
  }                                                                                              
public slots:                                                                                    
  void process(){
    QNetworkReply *reply = manager->get(QNetworkRequest(QUrl("http://www.qtcentre.org/")));
    QTimer::singleShot(5000, this, SLOT(process()));
  }
  void processReply(QNetworkReply *reply){
    qDebug() << reply->size();
    reply->deleteLater();
  }
private:
  QNetworkAccessManager *manager;
};

#include "main.moc"

int main(int argc, char **argv){
  QApplication app(argc, argv);
  Thread thread;
  thread.moveToThread(&thread);
  thread.start();
  return app.exec();
}

To copy to clipboard, switch view to plain text mode