禁用高 DPI 缩放

Question

启用屏幕缩放后，我想从我的代码中获取正确的数据。所以我使用SetProcessDPIAware()函数：

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 的错误还是我必须做其他事情才能从该属性中获取正确的数据？

如果唯一的方法是使用SystemInformation 类，那么我如何获取关于第二台监视器的数据，而不仅仅是关于主监视器的数据？

或 有没有办法为 powershell.exe / powershell_ise.exe 设置this 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

然后你可以调用这个类并获取 DPI 如下：

$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，始终使用相对大小，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)
})

以此类推，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 感知表单示例：https://stackoverflow.com/a/68240960/15339544

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• 左显示器：1920x1080 - 175% 缩放
• 右显示器：1920x1080 - 100% 缩放