using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace ICSharpCode.WinFormsUI
{
 public class PrimaryScreenHelper
 {
 #region Win32 API
 [DllImport("user32.dll")]
 static extern IntPtr GetDC(IntPtr ptr);
 [DllImport("gdi32.dll")]
 static extern int GetDeviceCaps(
 IntPtr hdc, // handle to DC
 int nIndex // index of capability
 );
 [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
 static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);
 #endregion
 #region DeviceCaps常量
 const int HORZRES = 8;
 const int VERTRES = 10;
 const int LOGPIXELSX = 88;
 const int LOGPIXELSY = 90;
 const int DESKTOPVERTRES = 117;
 const int DESKTOPHORZRES = 118;
 #endregion

 #region 属性
 /// <summary>
 /// 获取屏幕分辨率当前物理大小
 /// </summary>
 public static Size WorkingArea
 {
 get
 {
 IntPtr hdc = GetDC(IntPtr.Zero);
 Size size = new Size();
 size.Width = GetDeviceCaps(hdc, HORZRES);
 size.Height = GetDeviceCaps(hdc, VERTRES);
 ReleaseDC(IntPtr.Zero, hdc);
 return size;
 }
 }
 /// <summary>
 /// 当前系统DPI_X 大小 一般为96
 /// </summary>
 public static int DpiX
 {
 get
 {
 IntPtr hdc = GetDC(IntPtr.Zero);
 int DpiX = GetDeviceCaps(hdc, LOGPIXELSX);
 ReleaseDC(IntPtr.Zero, hdc);
 return DpiX;
 }
 }
 /// <summary>
 /// 当前系统DPI_Y 大小 一般为96
 /// </summary>
 public static int DpiY
 {
 get
 {
 IntPtr hdc = GetDC(IntPtr.Zero);
 int DpiX = GetDeviceCaps(hdc, LOGPIXELSY);
 ReleaseDC(IntPtr.Zero, hdc);
 return DpiX;
 }
 }
 /// <summary>
 /// 获取真实设置的桌面分辨率大小
 /// </summary>
 public static Size DESKTOP
 {
 get
 {
 IntPtr hdc = GetDC(IntPtr.Zero);
 Size size = new Size();
 size.Width = GetDeviceCaps(hdc, DESKTOPHORZRES);
 size.Height = GetDeviceCaps(hdc, DESKTOPVERTRES);
 ReleaseDC(IntPtr.Zero, hdc);
 return size;
 }
 }

 /// <summary>
 /// 获取宽度缩放百分比
 /// </summary>
 public static float ScaleX
 {
 get
 {
 IntPtr hdc = GetDC(IntPtr.Zero);
 int t = GetDeviceCaps(hdc, DESKTOPHORZRES);
 int d = GetDeviceCaps(hdc, HORZRES);
 float ScaleX = (float)GetDeviceCaps(hdc, DESKTOPHORZRES) / (float)GetDeviceCaps(hdc, HORZRES);
 ReleaseDC(IntPtr.Zero, hdc);
 return ScaleX;
 }
 }
 /// <summary>
 /// 获取高度缩放百分比
 /// </summary>
 public static float ScaleY
 {
 get
 {
 IntPtr hdc = GetDC(IntPtr.Zero);
 float ScaleY = (float)(float)GetDeviceCaps(hdc, DESKTOPVERTRES) / (float)GetDeviceCaps(hdc, VERTRES);
 ReleaseDC(IntPtr.Zero, hdc);
 return ScaleY;
 }
 }
 #endregion
 }
}