linkX11.cpp

#include <iostream>
#include <X11/Xlib.h>
#include <stdlib.h>
#include <stdio.h>
using namespace std;

int main(void)
{
  Display* d = XOpenDisplay(NULL);
  Screen*  s = DefaultScreenOfDisplay(d);
  int horizontal = s->height;
  int vertical = s->width;
  cout<<horizontal<<"x"<<vertical<<endl;
}
//g++ -g -o Test main.cpp -lX11


//CMakeLists.txt
/*cmake_minimum_required(VERSION 2.8.4)
project(X11test)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(SOURCE_FILES main.cpp)
include_directories(/usr/include/X11)
add_executable(X11test ${SOURCE_FILES})
target_link_libraries(X11test X11 )*/