GetThemeSysString

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

HRESULT GetThemeSysString(
    HTHEME hTheme,
    INT iStringId,
    LPWSTR pszStringBuff,
    INT cchMaxStringChars
);

<DllImport("UxTheme.dll", ExactSpelling:=True)>
Public Shared Function GetThemeSysString(
    hTheme As IntPtr,   ' HTHEME
    iStringId As Integer,   ' INT
    <MarshalAs(UnmanagedType.LPWStr)> pszStringBuff As System.Text.StringBuilder,   ' LPWSTR out
    cchMaxStringChars As Integer   ' INT
) As Integer
End Function

' hTheme : HTHEME
' iStringId : INT
' pszStringBuff : LPWSTR out
' cchMaxStringChars : INT
Declare PtrSafe Function GetThemeSysString Lib "uxtheme" ( _
    ByVal hTheme As LongPtr, _
    ByVal iStringId As Long, _
    ByVal pszStringBuff As LongPtr, _
    ByVal cchMaxStringChars As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetThemeSysString = ctypes.windll.uxtheme.GetThemeSysString
GetThemeSysString.restype = ctypes.c_int
GetThemeSysString.argtypes = [
    ctypes.c_ssize_t,  # hTheme : HTHEME
    ctypes.c_int,  # iStringId : INT
    wintypes.LPWSTR,  # pszStringBuff : LPWSTR out
    ctypes.c_int,  # cchMaxStringChars : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('UxTheme.dll')
GetThemeSysString = Fiddle::Function.new(
  lib['GetThemeSysString'],
  [
    Fiddle::TYPE_INTPTR_T,  # hTheme : HTHEME
    Fiddle::TYPE_INT,  # iStringId : INT
    Fiddle::TYPE_VOIDP,  # pszStringBuff : LPWSTR out
    Fiddle::TYPE_INT,  # cchMaxStringChars : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "uxtheme")]
extern "system" {
    fn GetThemeSysString(
        hTheme: isize,  // HTHEME
        iStringId: i32,  // INT
        pszStringBuff: *mut u16,  // LPWSTR out
        cchMaxStringChars: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("UxTheme.dll")]
public static extern int GetThemeSysString(IntPtr hTheme, int iStringId, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszStringBuff, int cchMaxStringChars);
"@
$api = Add-Type -MemberDefinition $sig -Name 'UxTheme_GetThemeSysString' -Namespace Win32 -PassThru
# $api::GetThemeSysString(hTheme, iStringId, pszStringBuff, cchMaxStringChars)

#uselib "UxTheme.dll"
#func global GetThemeSysString "GetThemeSysString" sptr, sptr, sptr, sptr
; GetThemeSysString hTheme, iStringId, varptr(pszStringBuff), cchMaxStringChars   ; 戻り値は stat
; hTheme : HTHEME -> "sptr"
; iStringId : INT -> "sptr"
; pszStringBuff : LPWSTR out -> "sptr"
; cchMaxStringChars : INT -> "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 GetThemeSysString "GetThemeSysString" sptr, int, var, int
; res = GetThemeSysString(hTheme, iStringId, pszStringBuff, cchMaxStringChars)
; hTheme : HTHEME -> "sptr"
; iStringId : INT -> "int"
; pszStringBuff : LPWSTR out -> "var"
; cchMaxStringChars : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; HRESULT GetThemeSysString(HTHEME hTheme, INT iStringId, LPWSTR pszStringBuff, INT cchMaxStringChars)
#uselib "UxTheme.dll"
#cfunc global GetThemeSysString "GetThemeSysString" intptr, int, var, int
; res = GetThemeSysString(hTheme, iStringId, pszStringBuff, cchMaxStringChars)
; hTheme : HTHEME -> "intptr"
; iStringId : INT -> "int"
; pszStringBuff : LPWSTR out -> "var"
; cchMaxStringChars : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	uxtheme = windows.NewLazySystemDLL("UxTheme.dll")
	procGetThemeSysString = uxtheme.NewProc("GetThemeSysString")
)

// hTheme (HTHEME), iStringId (INT), pszStringBuff (LPWSTR out), cchMaxStringChars (INT)
r1, _, err := procGetThemeSysString.Call(
	uintptr(hTheme),
	uintptr(iStringId),
	uintptr(pszStringBuff),
	uintptr(cchMaxStringChars),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetThemeSysString(
  hTheme: NativeInt;   // HTHEME
  iStringId: Integer;   // INT
  pszStringBuff: PWideChar;   // LPWSTR out
  cchMaxStringChars: Integer   // INT
): Integer; stdcall;
  external 'UxTheme.dll' name 'GetThemeSysString';

result := DllCall("UxTheme\GetThemeSysString"
    , "Ptr", hTheme   ; HTHEME
    , "Int", iStringId   ; INT
    , "Ptr", pszStringBuff   ; LPWSTR out
    , "Int", cchMaxStringChars   ; INT
    , "Int")   ; return: HRESULT

●GetThemeSysString(hTheme, iStringId, pszStringBuff, cchMaxStringChars) = DLL("UxTheme.dll", "int GetThemeSysString(int, int, char*, int)")
# 呼び出し: GetThemeSysString(hTheme, iStringId, pszStringBuff, cchMaxStringChars)
# hTheme : HTHEME -> "int"
# iStringId : INT -> "int"
# pszStringBuff : LPWSTR out -> "char*"
# cchMaxStringChars : INT -> "int"
# 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)。