C# API 获取系统DPI缩放倍数跟分辨率大小

原文:C# API 获取系统DPI缩放倍数跟分辨率大小

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
}
}

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原文地址：https://www.cnblogs.com/lonelyxmas/p/12051986.html