获取系统DPI、系统显示比例等

  1 using System;
  2 using System.Drawing;
  3 using System.Runtime.InteropServices;
  4  
  5 namespace XYDES
  6 {
  7     public class PrimaryScreen
  8     {
  9         #region Win32 API
 10                 [DllImport("user32.dll")]
 11                  static extern IntPtr GetDC(IntPtr ptr);
 12                 [DllImport("gdi32.dll")]
 13                  static extern int GetDeviceCaps(
 14                 IntPtr hdc, // handle to DC
 15                 int nIndex // index of capability
 16                 );
 17                 [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
 18                  static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);
 19         #endregion
 20         #region DeviceCaps常量
 21                 const int HORZRES = 8;
 22                 const int VERTRES = 10;
 23                 const int LOGPIXELSX = 88;
 24                 const int LOGPIXELSY = 90;
 25                 const int DESKTOPVERTRES = 117;
 26                 const int DESKTOPHORZRES = 118;
 27         #endregion
 28  
 29         #region 属性
 30         /// <summary>
 31         /// 获取屏幕分辨率当前物理大小
 32         /// </summary>
 33            public static Size WorkingArea
 34             {
 35                 get {
 36                     IntPtr hdc = GetDC(IntPtr.Zero);
 37                     Size size = new Size();
 38                     size.Width = GetDeviceCaps(hdc, HORZRES);
 39                     size.Height = GetDeviceCaps(hdc, VERTRES);
 40                     ReleaseDC(IntPtr.Zero, hdc);
 41                     return size;    
 42                 }
 43             }
 44         /// <summary>
 45            /// 当前系统DPI_X 大小 一般为96
 46         /// </summary>
 47             public static int DpiX
 48             {
 49                 get
 50                 {
 51                     IntPtr hdc = GetDC(IntPtr.Zero);
 52                     int DpiX = GetDeviceCaps(hdc, LOGPIXELSX );
 53                     ReleaseDC(IntPtr.Zero, hdc);
 54                     return DpiX;
 55                 }
 56             }
 57         /// <summary>
 58         /// 当前系统DPI_Y 大小 一般为96
 59         /// </summary>
 60             public static int DpiY
 61             {
 62                 get
 63                 {
 64                     IntPtr hdc = GetDC(IntPtr.Zero);
 65                     int DpiX = GetDeviceCaps(hdc,LOGPIXELSY);
 66                     ReleaseDC(IntPtr.Zero, hdc);
 67                     return DpiX;
 68                 }
 69             }
 70         /// <summary>
 71             /// 获取真实设置的桌面分辨率大小
 72         /// </summary>
 73             public static Size DESKTOP
 74             {
 75                 get
 76                 {
 77                     IntPtr hdc = GetDC(IntPtr.Zero);
 78                     Size size = new Size();
 79                     size.Width = GetDeviceCaps(hdc,DESKTOPHORZRES );
 80                     size.Height = GetDeviceCaps(hdc, DESKTOPVERTRES);
 81                     ReleaseDC(IntPtr.Zero, hdc);
 82                     return size;    
 83                 }
 84             }
 85  
 86             /// <summary>
 87             /// 获取宽度缩放百分比
 88             /// </summary>
 89             public static float ScaleX
 90             {
 91                 get
 92                 {
 93                     IntPtr hdc = GetDC(IntPtr.Zero);
 94                     int t = GetDeviceCaps(hdc, DESKTOPHORZRES);
 95                     int d = GetDeviceCaps(hdc, HORZRES);
 96                     float ScaleX = (float)GetDeviceCaps(hdc, DESKTOPHORZRES) / (float)GetDeviceCaps(hdc, HORZRES); 
 97                     ReleaseDC(IntPtr.Zero, hdc);
 98                     return ScaleX;
 99                 }
100             }
101             /// <summary>
102             /// 获取高度缩放百分比
103             /// </summary>
104             public static float ScaleY
105             {
106                 get
107                 {
108                     IntPtr hdc = GetDC(IntPtr.Zero);
109                     float ScaleY = (float)(float)GetDeviceCaps(hdc, DESKTOPVERTRES) / (float)GetDeviceCaps(hdc, VERTRES);
110                     ReleaseDC(IntPtr.Zero, hdc);
111                     return ScaleY;
112                 }
113             }
114        #endregion
115     }
116 }
转载于:https://www.cnblogs.com/bjxingch/articles/9960423.html