OpenThemeDataEx

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

HTHEME OpenThemeDataEx(
    HWND hwnd,   // optional
    LPCWSTR pszClassList,
    OPEN_THEME_DATA_FLAGS dwFlags
);

<DllImport("UXTHEME.dll", ExactSpelling:=True)>
Public Shared Function OpenThemeDataEx(
    hwnd As IntPtr,   ' HWND optional
    <MarshalAs(UnmanagedType.LPWStr)> pszClassList As String,   ' LPCWSTR
    dwFlags As UInteger   ' OPEN_THEME_DATA_FLAGS
) As IntPtr
End Function

' hwnd : HWND optional
' pszClassList : LPCWSTR
' dwFlags : OPEN_THEME_DATA_FLAGS
Declare PtrSafe Function OpenThemeDataEx Lib "uxtheme" ( _
    ByVal hwnd As LongPtr, _
    ByVal pszClassList As LongPtr, _
    ByVal dwFlags 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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('UXTHEME.dll')
OpenThemeDataEx = Fiddle::Function.new(
  lib['OpenThemeDataEx'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND optional
    Fiddle::TYPE_VOIDP,  # pszClassList : LPCWSTR
    -Fiddle::TYPE_INT,  # dwFlags : OPEN_THEME_DATA_FLAGS
  ],
  Fiddle::TYPE_INTPTR_T)

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

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

#uselib "UXTHEME.dll"
#func global OpenThemeDataEx "OpenThemeDataEx" sptr, sptr, sptr
; OpenThemeDataEx hwnd, pszClassList, dwFlags   ; 戻り値は stat
; hwnd : HWND optional -> "sptr"
; pszClassList : LPCWSTR -> "sptr"
; dwFlags : OPEN_THEME_DATA_FLAGS -> "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 OpenThemeDataEx "OpenThemeDataEx" sptr, wstr, int
; res = OpenThemeDataEx(hwnd, pszClassList, dwFlags)
; hwnd : HWND optional -> "sptr"
; pszClassList : LPCWSTR -> "wstr"
; dwFlags : OPEN_THEME_DATA_FLAGS -> "int"

; HTHEME OpenThemeDataEx(HWND hwnd, LPCWSTR pszClassList, OPEN_THEME_DATA_FLAGS dwFlags)
#uselib "UXTHEME.dll"
#cfunc global OpenThemeDataEx "OpenThemeDataEx" intptr, wstr, int
; res = OpenThemeDataEx(hwnd, pszClassList, dwFlags)
; hwnd : HWND optional -> "intptr"
; pszClassList : LPCWSTR -> "wstr"
; dwFlags : OPEN_THEME_DATA_FLAGS -> "int"

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

var (
	uxtheme = windows.NewLazySystemDLL("UXTHEME.dll")
	procOpenThemeDataEx = uxtheme.NewProc("OpenThemeDataEx")
)

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

function OpenThemeDataEx(
  hwnd: THandle;   // HWND optional
  pszClassList: PWideChar;   // LPCWSTR
  dwFlags: DWORD   // OPEN_THEME_DATA_FLAGS
): NativeInt; stdcall;
  external 'UXTHEME.dll' name 'OpenThemeDataEx';

result := DllCall("UXTHEME\OpenThemeDataEx"
    , "Ptr", hwnd   ; HWND optional
    , "WStr", pszClassList   ; LPCWSTR
    , "UInt", dwFlags   ; OPEN_THEME_DATA_FLAGS
    , "Ptr")   ; return: HTHEME

●OpenThemeDataEx(hwnd, pszClassList, dwFlags) = DLL("UXTHEME.dll", "int OpenThemeDataEx(void*, char*, dword)")
# 呼び出し: OpenThemeDataEx(hwnd, pszClassList, dwFlags)
# hwnd : HWND optional -> "void*"
# pszClassList : LPCWSTR -> "char*"
# dwFlags : OPEN_THEME_DATA_FLAGS -> "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)。