cpp-snippets/test.cpp at master · knebekaizer/cpp-snippets · GitHub

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#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/utsname.h>

int main(int argc, char** argv)
{
  Display* dpy = XOpenDisplay(NULL);
  if (dpy == NULL)
  {
    fprintf(stderr, "Cannot open display\n");
    exit(1);
  }

  int s = DefaultScreen(dpy);
  Window win = XCreateSimpleWindow(dpy, RootWindow(dpy, s), 10, 10, 660, 200, 1,
                                   BlackPixel(dpy, s), WhitePixel(dpy, s));
  XSelectInput(dpy, win, ExposureMask | KeyPressMask);
  XMapWindow(dpy, win);

#if defined(__APPLE_CC__)
  XStoreName(dpy, win, "Geeks3D.com - X11 window under Mac OS X (Lion)");
#else
  XStoreName(dpy, win, "Geeks3D.com - X11 window under Linux (Mint 10)");
#endif

  Atom WM_DELETE_WINDOW = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
  XSetWMProtocols(dpy, win, &WM_DELETE_WINDOW, 1);

  bool uname_ok = false;
  struct utsname sname;
  int ret = uname(&sname);
  if (ret != -1)
  {
    uname_ok = true;
  }

  XEvent e;
  while (1)
  {
    XNextEvent(dpy, &e);
    if (e.type == Expose)
    {
      int y_offset = 20;

#if defined(__APPLE_CC__)
      const char* s1 = "X11 test app under Mac OS X Lion";
#else
      const char* s1 = "X11 test app under Linux";
#endif

      const char* s2 = "(C)2012 Geeks3D.com";
      XDrawString(dpy, win, DefaultGC(dpy, s), 10, y_offset, s1, strlen(s1));
      y_offset += 20;
      XDrawString(dpy, win, DefaultGC(dpy, s), 10, y_offset, s2, strlen(s2));
      y_offset += 20;

      if (uname_ok)
      {
        char buf[256] = {0};

        sprintf(buf, "System information:");
        XDrawString(dpy, win, DefaultGC(dpy, s), 10, y_offset, buf, strlen(buf));
        y_offset += 15;

        sprintf(buf, "- System: %s", sname.sysname);
        XDrawString(dpy, win, DefaultGC(dpy, s), 10, y_offset, buf, strlen(buf));
        y_offset += 15;

        sprintf(buf, "- Release: %s", sname.release);
        XDrawString(dpy, win, DefaultGC(dpy, s), 10, y_offset, buf, strlen(buf));
        y_offset += 15;

        sprintf(buf, "- Version: %s", sname.version);
        XDrawString(dpy, win, DefaultGC(dpy, s), 10, y_offset, buf, strlen(buf));
        y_offset += 15;

        sprintf(buf, "- Machine: %s", sname.machine);
        XDrawString(dpy, win, DefaultGC(dpy, s), 10, y_offset, buf, strlen(buf));
        y_offset += 20;
      }


      XWindowAttributes  wa;
      XGetWindowAttributes(dpy, win, &wa);
      int width = wa.width;
      int height = wa.height;
      char buf[128]={0};
      sprintf(buf, "Current window size: %dx%d", width, height);
      XDrawString(dpy, win, DefaultGC(dpy, s), 10, y_offset, buf, strlen(buf));
      y_offset += 20;
    }

    if (e.type == KeyPress)
    {
      char buf[128] = {0};
      KeySym keysym;
      int len = XLookupString(&e.xkey, buf, sizeof buf, &keysym, NULL);
      if (keysym == XK_Escape)
        break;
    }

    if ((e.type == ClientMessage) &&
        (static_cast<unsigned int>(e.xclient.data.l[0]) == WM_DELETE_WINDOW))
    {
      break;
    }
  }

  XDestroyWindow(dpy, win);
  XCloseDisplay(dpy);
  return 0;
}