#include "as_gps.h"int main(int argc, char **argv){  if(as_gps_open("/dev/gps"))  {    printf("Can't open device\n");    exit(1);  }  while(1)  {    void *data=NULL;    char send_data[50];    unsigned char result = as_gps_handle_input(&data);    as_gps_send_cmd(0xb6, send_data, 4);    if(result == AS_GPS_RCV_POSITION_DATA) // PositionData    {      as_gps_print_position_data((AS_GPS_PositionData *)data);      }    free(data);  }  as_gps_close(); }