EngGetCurrentCodePage

// GDI32.dll
#include <windows.h>

void EngGetCurrentCodePage(
    WORD* OemCodePage,
    WORD* AnsiCodePage
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Sub EngGetCurrentCodePage(
    <Out> ByRef OemCodePage As UShort,   ' WORD* out
    <Out> ByRef AnsiCodePage As UShort   ' WORD* out
)
End Sub

' OemCodePage : WORD* out
' AnsiCodePage : WORD* out
Declare PtrSafe Sub EngGetCurrentCodePage Lib "gdi32" ( _
    ByRef OemCodePage As Integer, _
    ByRef AnsiCodePage As Integer)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

EngGetCurrentCodePage = ctypes.windll.gdi32.EngGetCurrentCodePage
EngGetCurrentCodePage.restype = None
EngGetCurrentCodePage.argtypes = [
    ctypes.POINTER(ctypes.c_ushort),  # OemCodePage : WORD* out
    ctypes.POINTER(ctypes.c_ushort),  # AnsiCodePage : WORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
EngGetCurrentCodePage = Fiddle::Function.new(
  lib['EngGetCurrentCodePage'],
  [
    Fiddle::TYPE_VOIDP,  # OemCodePage : WORD* out
    Fiddle::TYPE_VOIDP,  # AnsiCodePage : WORD* out
  ],
  Fiddle::TYPE_VOID)

#[link(name = "gdi32")]
extern "system" {
    fn EngGetCurrentCodePage(
        OemCodePage: *mut u16,  // WORD* out
        AnsiCodePage: *mut u16  // WORD* out
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll")]
public static extern void EngGetCurrentCodePage(out ushort OemCodePage, out ushort AnsiCodePage);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_EngGetCurrentCodePage' -Namespace Win32 -PassThru
# $api::EngGetCurrentCodePage(OemCodePage, AnsiCodePage)

#uselib "GDI32.dll"
#func global EngGetCurrentCodePage "EngGetCurrentCodePage" sptr, sptr
; EngGetCurrentCodePage varptr(OemCodePage), varptr(AnsiCodePage)
; OemCodePage : WORD* out -> "sptr"
; AnsiCodePage : WORD* out -> "sptr"

#uselib "GDI32.dll"
#func global EngGetCurrentCodePage "EngGetCurrentCodePage" var, var
; EngGetCurrentCodePage OemCodePage, AnsiCodePage
; OemCodePage : WORD* out -> "var"
; AnsiCodePage : WORD* out -> "var"
; ※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。

; void EngGetCurrentCodePage(WORD* OemCodePage, WORD* AnsiCodePage)
#uselib "GDI32.dll"
#func global EngGetCurrentCodePage "EngGetCurrentCodePage" var, var
; EngGetCurrentCodePage OemCodePage, AnsiCodePage
; OemCodePage : WORD* out -> "var"
; AnsiCodePage : WORD* out -> "var"
; ※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 (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procEngGetCurrentCodePage = gdi32.NewProc("EngGetCurrentCodePage")
)

// OemCodePage (WORD* out), AnsiCodePage (WORD* out)
r1, _, err := procEngGetCurrentCodePage.Call(
	uintptr(OemCodePage),
	uintptr(AnsiCodePage),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure EngGetCurrentCodePage(
  OemCodePage: Pointer;   // WORD* out
  AnsiCodePage: Pointer   // WORD* out
); stdcall;
  external 'GDI32.dll' name 'EngGetCurrentCodePage';

result := DllCall("GDI32\EngGetCurrentCodePage"
    , "Ptr", OemCodePage   ; WORD* out
    , "Ptr", AnsiCodePage   ; WORD* out
    , "Int")   ; return: void

●EngGetCurrentCodePage(OemCodePage, AnsiCodePage) = DLL("GDI32.dll", "int EngGetCurrentCodePage(void*, void*)")
# 呼び出し: EngGetCurrentCodePage(OemCodePage, AnsiCodePage)
# OemCodePage : WORD* out -> "void*"
# AnsiCodePage : WORD* out -> "void*"
# 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)。