EnumSystemCodePagesW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

BOOL EnumSystemCodePagesW(
    CODEPAGE_ENUMPROCW lpCodePageEnumProc,
    ENUM_SYSTEM_CODE_PAGES_FLAGS dwFlags
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function EnumSystemCodePagesW(
    lpCodePageEnumProc As IntPtr,   ' CODEPAGE_ENUMPROCW
    dwFlags As UInteger   ' ENUM_SYSTEM_CODE_PAGES_FLAGS
) As Boolean
End Function

' lpCodePageEnumProc : CODEPAGE_ENUMPROCW
' dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS
Declare PtrSafe Function EnumSystemCodePagesW Lib "kernel32" ( _
    ByVal lpCodePageEnumProc As LongPtr, _
    ByVal dwFlags As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

EnumSystemCodePagesW = ctypes.windll.kernel32.EnumSystemCodePagesW
EnumSystemCodePagesW.restype = wintypes.BOOL
EnumSystemCodePagesW.argtypes = [
    ctypes.c_void_p,  # lpCodePageEnumProc : CODEPAGE_ENUMPROCW
    wintypes.DWORD,  # dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
EnumSystemCodePagesW = Fiddle::Function.new(
  lib['EnumSystemCodePagesW'],
  [
    Fiddle::TYPE_VOIDP,  # lpCodePageEnumProc : CODEPAGE_ENUMPROCW
    -Fiddle::TYPE_INT,  # dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn EnumSystemCodePagesW(
        lpCodePageEnumProc: *const core::ffi::c_void,  // CODEPAGE_ENUMPROCW
        dwFlags: u32  // ENUM_SYSTEM_CODE_PAGES_FLAGS
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool EnumSystemCodePagesW(IntPtr lpCodePageEnumProc, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_EnumSystemCodePagesW' -Namespace Win32 -PassThru
# $api::EnumSystemCodePagesW(lpCodePageEnumProc, dwFlags)

#uselib "KERNEL32.dll"
#func global EnumSystemCodePagesW "EnumSystemCodePagesW" wptr, wptr
; EnumSystemCodePagesW lpCodePageEnumProc, dwFlags   ; 戻り値は stat
; lpCodePageEnumProc : CODEPAGE_ENUMPROCW -> "wptr"
; dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS -> "wptr"
; ※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 "KERNEL32.dll"
#cfunc global EnumSystemCodePagesW "EnumSystemCodePagesW" sptr, int
; res = EnumSystemCodePagesW(lpCodePageEnumProc, dwFlags)
; lpCodePageEnumProc : CODEPAGE_ENUMPROCW -> "sptr"
; dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS -> "int"

; BOOL EnumSystemCodePagesW(CODEPAGE_ENUMPROCW lpCodePageEnumProc, ENUM_SYSTEM_CODE_PAGES_FLAGS dwFlags)
#uselib "KERNEL32.dll"
#cfunc global EnumSystemCodePagesW "EnumSystemCodePagesW" intptr, int
; res = EnumSystemCodePagesW(lpCodePageEnumProc, dwFlags)
; lpCodePageEnumProc : CODEPAGE_ENUMPROCW -> "intptr"
; dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procEnumSystemCodePagesW = kernel32.NewProc("EnumSystemCodePagesW")
)

// lpCodePageEnumProc (CODEPAGE_ENUMPROCW), dwFlags (ENUM_SYSTEM_CODE_PAGES_FLAGS)
r1, _, err := procEnumSystemCodePagesW.Call(
	uintptr(lpCodePageEnumProc),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function EnumSystemCodePagesW(
  lpCodePageEnumProc: Pointer;   // CODEPAGE_ENUMPROCW
  dwFlags: DWORD   // ENUM_SYSTEM_CODE_PAGES_FLAGS
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'EnumSystemCodePagesW';

result := DllCall("KERNEL32\EnumSystemCodePagesW"
    , "Ptr", lpCodePageEnumProc   ; CODEPAGE_ENUMPROCW
    , "UInt", dwFlags   ; ENUM_SYSTEM_CODE_PAGES_FLAGS
    , "Int")   ; return: BOOL

●EnumSystemCodePagesW(lpCodePageEnumProc, dwFlags) = DLL("KERNEL32.dll", "bool EnumSystemCodePagesW(void*, dword)")
# 呼び出し: EnumSystemCodePagesW(lpCodePageEnumProc, dwFlags)
# lpCodePageEnumProc : CODEPAGE_ENUMPROCW -> "void*"
# dwFlags : ENUM_SYSTEM_CODE_PAGES_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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。