c# - 禁用高 DPI 缩放

Question

我想在启用屏幕缩放时从我的代码中获取正确的数据。所以我正在使用 SetProcessDPIAware()功能:

using namespace System.Windows.Forms

Clear-Host
Add-Type -AssemblyName System.Windows.Forms
Add-Type -Name User32 -Namespace W32 '
[DllImport("user32.dll")]
public static extern bool SetProcessDPIAware();'


[Cursor]::Position | Write-Host
[Screen]::PrimaryScreen.Bounds.Size | Write-Host
[SystemInformation]::PrimaryMonitorSize | Write-Host

[W32.User32]::SetProcessDPIAware()

[Cursor]::Position | Write-Host
[Screen]::PrimaryScreen.Bounds.Size | Write-Host
[SystemInformation]::PrimaryMonitorSize | Write-Host

输出:

{X=630,Y=313}             # ❌ incorrect data
{Width=2048, Height=864}  # ❌ incorrect data
{Width=2048, Height=864}  # ❌ incorrect data
True
{X=788,Y=391}             # ✔️ data became correct
{Width=2048, Height=864}  # ❌ still incorrect data
{Width=2560, Height=1080} # ✔️ data became correct

与c#代码相同的情况:

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
 
public class Class1
{
    [DllImport("user32.dll")]
    static extern bool SetProcessDPIAware();

    public static void Main()
    {
        Console.WriteLine("\n");

        Console.WriteLine(Cursor.Position);
        Console.WriteLine(Screen.PrimaryScreen.Bounds.Size);
        Console.WriteLine(SystemInformation.PrimaryMonitorSize);

        Console.WriteLine(SetProcessDPIAware());

        Console.WriteLine(Cursor.Position);
        Console.WriteLine(Screen.PrimaryScreen.Bounds.Size);
        Console.WriteLine(SystemInformation.PrimaryMonitorSize);
    }
}

那么这是 Screen.PrimaryScreen.Bounds 的错误，还是我必须执行其他操作才能从此属性获取正确的数据？

如果唯一的方法是使用 SystemInformation 类，那么我如何获取有关第二个显示器的数据，而不仅仅是有关主要显示器的数据？

或有没有办法设置this powershell.exe/powershell_ise.exe 的设置 ?

Answer 1

这是我使用并为我工作的:

Add-Type -TypeDefinition @'
using System; 
using System.Runtime.InteropServices;
using System.Drawing;

public class DPI
{  
    [DllImport("gdi32.dll")]
    static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

    public enum DeviceCap
    {
        VERTRES = 10,
        DESKTOPVERTRES = 117
    } 

    public static float scaling()
    {
        Graphics g = Graphics.FromHwnd(IntPtr.Zero);
        IntPtr desktop = g.GetHdc();
        int LogicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.VERTRES);
        int PhysicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.DESKTOPVERTRES);

        return (float)PhysicalScreenHeight / (float)LogicalScreenHeight;
    }
}
'@ -ReferencedAssemblies System.Drawing -IgnoreWarnings -WarningAction Ignore

然后你可以像这样调用这个类并得到 DPI:

$DPI = [math]::round([dpi]::scaling(), 2) * 100
$bounds = [System.Windows.Forms.Screen]::PrimaryScreen.WorkingArea
$bounds.Width = ($bounds.Width / 100) * $DPI
$bounds.Height = ($bounds.Height / 100) * $DPI

最后，始终使用相对尺寸，例如:

$form.Size = [System.Drawing.Size]::new(($bounds.Width / X),($bounds.Height / X))

$form.Add_Resize({
    $txtBox.Size = [System.Drawing.Size]::new(($this.Width - X), XX)
})

依此类推，其中 X 可以是 int 或 double。

• Source for the class .我不确定这是否是 OP，因为我在不同的网站上看到过相同的代码。
• DPI Aware 表单示例:https://stackoverflow.com/a/68240960/15339544

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• 左显示器:1920x1080 - 175% 缩放比例
• 右监视器:1920x1080 - 100% 缩放