#include <X11/Xlib.h>
#include <X11/extensions/dmxext.h>
#include <stdio.h>

int main()
{
   Display* dpy;
   DMXScreenAttributes attr;
   int screen_count;
   int index;

   XInitThreads();
   dpy=XOpenDisplay(NULL);
   if(DMXGetScreenCount(dpy, &screen_count))
   {
      printf("screen_count:%d\n",screen_count);
      for(index=0;index<screen_count;++index)
      {
         if(DMXGetScreenAttributes(dpy, index, &attr))
            printf("displayName:%s\n",attr.displayName);
      }
   }
   XCloseDisplay(dpy);
   return 0;
}