OpenThemeDataForDpi

// UxTheme.dll
#include <windows.h>

HTHEME OpenThemeDataForDpi(
    HWND hwnd,   // optional
    LPCWSTR pszClassList,
    DWORD dpi
);

<DllImport("UxTheme.dll", ExactSpelling:=True)>
Public Shared Function OpenThemeDataForDpi(
    hwnd As IntPtr,   ' HWND optional
    <MarshalAs(UnmanagedType.LPWStr)> pszClassList As String,   ' LPCWSTR
    dpi As UInteger   ' DWORD
) As IntPtr
End Function

' hwnd : HWND optional
' pszClassList : LPCWSTR
' dpi : DWORD
Declare PtrSafe Function OpenThemeDataForDpi Lib "uxtheme" ( _
    ByVal hwnd As LongPtr, _
    ByVal pszClassList As LongPtr, _
    ByVal dpi As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

OpenThemeDataForDpi = ctypes.windll.uxtheme.OpenThemeDataForDpi
OpenThemeDataForDpi.restype = ctypes.c_ssize_t
OpenThemeDataForDpi.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND optional
    wintypes.LPCWSTR,  # pszClassList : LPCWSTR
    wintypes.DWORD,  # dpi : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('UxTheme.dll')
OpenThemeDataForDpi = Fiddle::Function.new(
  lib['OpenThemeDataForDpi'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND optional
    Fiddle::TYPE_VOIDP,  # pszClassList : LPCWSTR
    -Fiddle::TYPE_INT,  # dpi : DWORD
  ],
  Fiddle::TYPE_INTPTR_T)

#[link(name = "uxtheme")]
extern "system" {
    fn OpenThemeDataForDpi(
        hwnd: *mut core::ffi::c_void,  // HWND optional
        pszClassList: *const u16,  // LPCWSTR
        dpi: u32  // DWORD
    ) -> isize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("UxTheme.dll")]
public static extern IntPtr OpenThemeDataForDpi(IntPtr hwnd, [MarshalAs(UnmanagedType.LPWStr)] string pszClassList, uint dpi);
"@
$api = Add-Type -MemberDefinition $sig -Name 'UxTheme_OpenThemeDataForDpi' -Namespace Win32 -PassThru
# $api::OpenThemeDataForDpi(hwnd, pszClassList, dpi)

#uselib "UxTheme.dll"
#func global OpenThemeDataForDpi "OpenThemeDataForDpi" sptr, sptr, sptr
; OpenThemeDataForDpi hwnd, pszClassList, dpi   ; 戻り値は stat
; hwnd : HWND optional -> "sptr"
; pszClassList : LPCWSTR -> "sptr"
; dpi : DWORD -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "UxTheme.dll"
#cfunc global OpenThemeDataForDpi "OpenThemeDataForDpi" sptr, wstr, int
; res = OpenThemeDataForDpi(hwnd, pszClassList, dpi)
; hwnd : HWND optional -> "sptr"
; pszClassList : LPCWSTR -> "wstr"
; dpi : DWORD -> "int"

; HTHEME OpenThemeDataForDpi(HWND hwnd, LPCWSTR pszClassList, DWORD dpi)
#uselib "UxTheme.dll"
#cfunc global OpenThemeDataForDpi "OpenThemeDataForDpi" intptr, wstr, int
; res = OpenThemeDataForDpi(hwnd, pszClassList, dpi)
; hwnd : HWND optional -> "intptr"
; pszClassList : LPCWSTR -> "wstr"
; dpi : DWORD -> "int"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	uxtheme = windows.NewLazySystemDLL("UxTheme.dll")
	procOpenThemeDataForDpi = uxtheme.NewProc("OpenThemeDataForDpi")
)

// hwnd (HWND optional), pszClassList (LPCWSTR), dpi (DWORD)
r1, _, err := procOpenThemeDataForDpi.Call(
	uintptr(hwnd),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszClassList))),
	uintptr(dpi),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HTHEME

function OpenThemeDataForDpi(
  hwnd: THandle;   // HWND optional
  pszClassList: PWideChar;   // LPCWSTR
  dpi: DWORD   // DWORD
): NativeInt; stdcall;
  external 'UxTheme.dll' name 'OpenThemeDataForDpi';

result := DllCall("UxTheme\OpenThemeDataForDpi"
    , "Ptr", hwnd   ; HWND optional
    , "WStr", pszClassList   ; LPCWSTR
    , "UInt", dpi   ; DWORD
    , "Ptr")   ; return: HTHEME

●OpenThemeDataForDpi(hwnd, pszClassList, dpi) = DLL("UxTheme.dll", "int OpenThemeDataForDpi(void*, char*, dword)")
# 呼び出し: OpenThemeDataForDpi(hwnd, pszClassList, dpi)
# hwnd : HWND optional -> "void*"
# pszClassList : LPCWSTR -> "char*"
# dpi : DWORD -> "dword"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。