EnumSystemCodePagesA

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

BOOL EnumSystemCodePagesA(
    CODEPAGE_ENUMPROCA lpCodePageEnumProc,
    ENUM_SYSTEM_CODE_PAGES_FLAGS dwFlags
);

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

' lpCodePageEnumProc : CODEPAGE_ENUMPROCA
' dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS
Declare PtrSafe Function EnumSystemCodePagesA Lib "kernel32" ( _
    ByVal lpCodePageEnumProc As LongPtr, _
    ByVal dwFlags 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

EnumSystemCodePagesA = ctypes.windll.kernel32.EnumSystemCodePagesA
EnumSystemCodePagesA.restype = wintypes.BOOL
EnumSystemCodePagesA.argtypes = [
    ctypes.c_void_p,  # lpCodePageEnumProc : CODEPAGE_ENUMPROCA
    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')
EnumSystemCodePagesA = Fiddle::Function.new(
  lib['EnumSystemCodePagesA'],
  [
    Fiddle::TYPE_VOIDP,  # lpCodePageEnumProc : CODEPAGE_ENUMPROCA
    -Fiddle::TYPE_INT,  # dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn EnumSystemCodePagesA(
        lpCodePageEnumProc: *const core::ffi::c_void,  // CODEPAGE_ENUMPROCA
        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.Ansi, SetLastError = true)]
public static extern bool EnumSystemCodePagesA(IntPtr lpCodePageEnumProc, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_EnumSystemCodePagesA' -Namespace Win32 -PassThru
# $api::EnumSystemCodePagesA(lpCodePageEnumProc, dwFlags)

#uselib "KERNEL32.dll"
#func global EnumSystemCodePagesA "EnumSystemCodePagesA" sptr, sptr
; EnumSystemCodePagesA lpCodePageEnumProc, dwFlags   ; 戻り値は stat
; lpCodePageEnumProc : CODEPAGE_ENUMPROCA -> "sptr"
; dwFlags : ENUM_SYSTEM_CODE_PAGES_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 "KERNEL32.dll"
#cfunc global EnumSystemCodePagesA "EnumSystemCodePagesA" sptr, int
; res = EnumSystemCodePagesA(lpCodePageEnumProc, dwFlags)
; lpCodePageEnumProc : CODEPAGE_ENUMPROCA -> "sptr"
; dwFlags : ENUM_SYSTEM_CODE_PAGES_FLAGS -> "int"

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

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procEnumSystemCodePagesA = kernel32.NewProc("EnumSystemCodePagesA")
)

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

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

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

●EnumSystemCodePagesA(lpCodePageEnumProc, dwFlags) = DLL("KERNEL32.dll", "bool EnumSystemCodePagesA(void*, dword)")
# 呼び出し: EnumSystemCodePagesA(lpCodePageEnumProc, dwFlags)
# lpCodePageEnumProc : CODEPAGE_ENUMPROCA -> "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)。