c++ - QWinEventNotifier: Can only be used with threads started with QThread -

i trying open huwawei usb dongle using "qextserialport".

my port details follows

port name: product id: physical name: \device\000000ca vendor id: friend name:  sb  port name: product id:? physical name: \device\usbpdo-10 vendor id: ? friend name:  th  port name: com3 product id: physical name: \device\bthmodem0 vendor id: friend name: standard serial on bluetooth link (com3)  port name: com4 product id: physical name: \device\bthmodem2 vendor id: friend name: standard serial on bluetooth link (com4)  port name: com5 product id: physical name: \device\bthmodem1 vendor id: friend name: standard modem on bluetooth link  port name: com6 product id:? physical name: \device\000000e2 vendor id: ? friend name: huawei mobile connect - 3g application interface (com6)  port name: com7 product id:? physical name: \device\000000e0 vendor id: ? friend name: huawei mobile connect - 3g modem  port name: com8 product id:? physical name: \device\000000e3 vendor id: ? friend name: huawei mobile connect - 3g pc ui interface (com8) 

i trying open usb dongle, can send sms. following code opening

#include "myclass.h" #include <qstring.h> #include <qdebug.h>   int main() {     qextserialport *port = new qextserialport("com7");     port->open(qiodevice::readwrite);     cout << port->isopen();      system("pause");     return 0;  } 

when run code,

qwineventnotifier: can used threads started qthread  1 

this shows port id open, message? means can't proceed other code? want know before code else. please help!

most likely, need create qapplication, without many things events , signals/slots won't work:

int main() {     qapplication app;      qextserialport *port = new qextserialport("com7");     port->open(qiodevice::readwrite);     cout << port->isopen();      system("pause");      return app.exec(); }