using System;
using System.Runtime.InteropServices;
public class Starter {
public static void Main() {
IntPtr hDC = API.GetDC(IntPtr.Zero);
int v = API.GetDeviceCaps(hDC, API.HORZRES);
Console.WriteLine("Vertical size of window {0}mm.", v);
int h = API.GetDeviceCaps(hDC, API.HORZRES);
Console.WriteLine("Horizontal size of window {0}mm.", h);
int resp = API.ReleaseDC(IntPtr.Zero, hDC);
if (resp != 1) {
Console.WriteLine("Error releasing hdc");
}
}
}
public static class API {
[DllImport("user32.dll")]
public static extern IntPtr GetDC(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("gdi32.dll")]
public static extern int GetDeviceCaps(IntPtr hDC, int nIndex);
public const int HORZSIZE = 4; // horizontal size in pixels
public const int VERTSIZE = 6; // vertical size in pixels
public const int HORZRES = 8; // horizontal size in millimeters
public const int VERTRES = 10; // vertical size in millimeters
}