How to enable touch whit this code :QWSServer::setCursorVisible( true ) on friendly arm.

[MhM93]

as follow this link: https://forum.qt.io/topic/7524/hide-mouse-pointer/5
I have problem for hide mouse pointer and I use this code for hiding that:

#include <QWSServer>
int main(int argc, char *argv[])
{

   QApplication a(argc, argv);
   #ifdef Q_WS_QWS
   QWSServer::setCursorVisible( false);
   #endif 
   ........

after this code my pointer is hide, BUT the touch is not worked for me. then I change the false to true but nothing changed just show the cursor at first but when i touch the screen the cursor hide and the buttons in my App not work, how can I active my touch on my arm device?
this is my device profile:

export QWS_MOUSE_PROTO=Tslib:/dev/touchscreen-1wire
export QWS_KEYBOARD=TTY:/dev/tty1