I use the function to register hotkey:
Qt Code: 
  1. void MyApp::registerGlobalKey(){
  2.     if(RegisterHotKey(NULL, 10, 0, VK_F10)){
  3.         qDebug("VK_F10.");
  4.         std::cout << "VK_F10" << std::endl;
  5.     }
  6.     if(RegisterHotKey(NULL, 11, 0, VK_F11)){
  7.         qDebug("VK_F11.");
  8.         std::cout << "VK_F11" << std::endl;
  9.     }
  10. }
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and it works.

also I reimplement winEventFilter:
Qt Code: 
  1. bool MyApp::winEventFilter(MSG *msg, long *result){
  2.     if(WM_HOTKEY == msg->message){
  3.         qDebug("hotkey.");
  4.         if(msg->wParam == VK_F10)
  5.             qDebug("get F10.");
  6.         emit getHotKey();
  7.         return true;
  8.     }
  9.     //qDebug("not hotkey.");
  10.     return false;
  11. }
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but I don't know what to do later to make it able to catch the system/global hot keys.