X11

#include <X11/Xlib.h>
#include <iostream>
 
int main()
{
    auto display = XOpenDisplay(nullptr);
    auto root_window = DefaultRootWindow(display);
 
    Window root_return, parent_return;
    Window * child_list = nullptr;
    unsigned int child_num = 0;
    XQueryTree(display, root_window, &root_return, &parent_return, &child_list, &child_num);
 
    for(unsigned int i = 0; i < child_num; ++i) {
        auto window = child_list[i];
        XWindowAttributes attrs;
        char* title = nullptr;
        XGetWindowAttributes(display, window, &attrs);
        XFetchName(display, window, &title);
        std::cout << "#" << i <<":" << "(" << attrs.width << ", " << attrs.height << ")";
        if(title){
                std::cout << title;
        }
        std::cout  << std::endl;
        XFree(title);
    }
 
    XFree(child_list);
    XCloseDisplay(display);
 
    return 0;
}