powershell 和 winapi 的交互，获取窗口大小及边框大小

get_window_info_powershell.ps1

using namespace System;
using namespace System.Diagnostics;
using namespace System.Runtime.InteropServices;

param (
  [Parameter(Mandatory = $True)]
  [string]$hWndHexStr
)

Add-Type -TypeDefinition @"
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Explicit, Size = 16)]
public struct RECT
{
  [FieldOffset(0)]
  public int left;

  [FieldOffset(4)]
  public int top;

  [FieldOffset(8)]
  public int right;

  [FieldOffset(12)]
  public int bottom;
}

[StructLayout(LayoutKind.Sequential)]
public struct WINDOWINFO
{
  public uint cbSize;
  public RECT rcWindow;
  public RECT rcClient;
  public uint dwStyle;
  public uint dwExStyle;
  public uint dwWindowStatus;
  public uint cxWindowBorders;
  public uint cyWindowBorders;
  public ushort atomWindowType;
  public ushort wCreatorVersion;
}

public static class Kernel32
{
  [DllImport("kernel32.dll", EntryPoint="GetLastError")]
  public static extern uint GetLastError();
}

public static class User32
{
  [DllImport("user32.dll", EntryPoint="GetWindowInfo", SetLastError=true)]
  public static extern bool GetWindowInfo(
    IntPtr hWnd,
    ref WINDOWINFO pwi);
}

public static class Dwm
{
  [DllImport("dwmapi.dll", EntryPoint="DwmGetWindowAttribute")]
  public static extern int DwmGetWindowAttribute(
    IntPtr hWnd,
    uint dwAttribute,
    out RECT pvAttribute, // 参见 http://pinvoke.net/default.aspx/dwmapi.DwmGetWindowAttribute，是分了 RECT 和 bool 两种参数的，而不是 IntPtr
    uint cbAttribute);
}
"@

function Get-Pretty-Print {
    param (
        [RECT]$rect
    )
    return "($($rect.left), $($rect.top)) - ($($rect.right), $($rect.bottom)) $($rect.right-$rect.left)x$($rect.bottom-$rect.top)"
}

$hWnd = [Convert]::ToInt64($hWndHexStr, 16)

$WindowInfo = New-Object WINDOWINFO
$WindowInfo.cbSize = [Marshal]::SizeOf([System.Type] [WINDOWINFO])

$ret = [User32]::GetWindowInfo($hWnd, [ref] $WindowInfo)
if (!$ret) {
    Write-Output "$((New-Object System.ComponentModel.Win32Exception([int][Kernel32]::GetLastError())).Message)"
}
else {
    $rcWindow = Get-Pretty-Print -rect $WindowInfo.rcWindow
    $rcClient = Get-Pretty-Print -rect $WindowInfo.rcClient
    Write-Output "window: $($rcWindow)"
    Write-Output "client: $($rcClient)"
    Write-Output "border: [width: $($WindowInfo.cxWindowBorders), height: $($WindowInfo.cyWindowBorders)]"
}

New-Variable -Name DWMWA_EXTENDED_FRAME_BOUNDS -Option Constant -Value 0x09
New-Variable -Name S_OK -Option Constant -Value 0
$dwmRect = New-Object RECT
$dwmRectSize = [Marshal]::SizeOf([System.Type] [RECT])
$ret = [Dwm]::DwmGetWindowAttribute($hWnd, $DWMWA_EXTENDED_FRAME_BOUNDS, [ref] $dwmRect, $dwmRectSize)
if ($ret -eq $S_OK) {
    $rcDwmWindow = Get-Pretty-Print -rect $dwmRect
    Write-Output "dwm window: $($rcDwmWindow)"
}
else {
    Write-Output "Error code: $($ret.ToString('X'))`r"
    Write-Output "Check reference https://docs.microsoft.com/en-us/windows/desktop/seccrypto/common-hresult-values"
}