using System;

using System.Drawing;

using System.Runtime.InteropServices;

 

namespace XYDES

{

    public class PrimaryScreen

    {

        #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

    }

}