#include <iostream>

#include <Windows.h>

int
main (void)
{
  HDC hdc = GetDC (0);

  if (hdc)
    {
      int ht = GetDeviceCaps (hdc, VERTRES);
      int wd = GetDeviceCaps (hdc, HORZRES);

      std::cerr << wd << "x" << ht << " pixels" << std::endl;

      double ht_mm = GetDeviceCaps (hdc, VERTSIZE);
      double wd_mm = GetDeviceCaps (hdc, HORZSIZE);

      std::cerr << wd_mm << "x" << ht_mm << " mm" << std::endl;

      double resy = wd * 25.4 / wd_mm;
      double resx = ht * 25.4 / ht_mm;
      
      double resy_log = GetDeviceCaps (hdc, LOGPIXELSY);
      double resx_log = GetDeviceCaps (hdc, LOGPIXELSX);

      std::cerr << resx << " resx" << std::endl;
      std::cerr << resy << " resy" << std::endl;
      std::cerr << resx_log << " resx_log" << std::endl;
      std::cerr << resy_log << " resy_log" << std::endl;

      std::cerr << (resx + resy) / 2 << " avg dpi" << std::endl;

      int depth = GetDeviceCaps (hdc, BITSPIXEL);

      std::cerr << depth << " bit depth" << std::endl;

      ReleaseDC(0, hdc);
    }
  else
    std::cerr << "failed to get device context" << std::endl;

  return 0;
}