TranslateCharsetInfo

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

BOOL TranslateCharsetInfo(
    DWORD* lpSrc,
    CHARSETINFO* lpCs,
    TRANSLATE_CHARSET_INFO_FLAGS dwFlags
);

<DllImport("GDI32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function TranslateCharsetInfo(
    ByRef lpSrc As UInteger,   ' DWORD* in/out
    lpCs As IntPtr,   ' CHARSETINFO* out
    dwFlags As UInteger   ' TRANSLATE_CHARSET_INFO_FLAGS
) As Boolean
End Function

' lpSrc : DWORD* in/out
' lpCs : CHARSETINFO* out
' dwFlags : TRANSLATE_CHARSET_INFO_FLAGS
Declare PtrSafe Function TranslateCharsetInfo Lib "gdi32" ( _
    ByRef lpSrc As Long, _
    ByVal lpCs 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

TranslateCharsetInfo = ctypes.windll.gdi32.TranslateCharsetInfo
TranslateCharsetInfo.restype = wintypes.BOOL
TranslateCharsetInfo.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # lpSrc : DWORD* in/out
    ctypes.c_void_p,  # lpCs : CHARSETINFO* out
    wintypes.DWORD,  # dwFlags : TRANSLATE_CHARSET_INFO_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
TranslateCharsetInfo = Fiddle::Function.new(
  lib['TranslateCharsetInfo'],
  [
    Fiddle::TYPE_VOIDP,  # lpSrc : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # lpCs : CHARSETINFO* out
    -Fiddle::TYPE_INT,  # dwFlags : TRANSLATE_CHARSET_INFO_FLAGS
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn TranslateCharsetInfo(
        lpSrc: *mut u32,  // DWORD* in/out
        lpCs: *mut CHARSETINFO,  // CHARSETINFO* out
        dwFlags: u32  // TRANSLATE_CHARSET_INFO_FLAGS
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("GDI32.dll", SetLastError = true)]
public static extern bool TranslateCharsetInfo(ref uint lpSrc, IntPtr lpCs, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_TranslateCharsetInfo' -Namespace Win32 -PassThru
# $api::TranslateCharsetInfo(lpSrc, lpCs, dwFlags)

#uselib "GDI32.dll"
#func global TranslateCharsetInfo "TranslateCharsetInfo" sptr, sptr, sptr
; TranslateCharsetInfo varptr(lpSrc), varptr(lpCs), dwFlags   ; 戻り値は stat
; lpSrc : DWORD* in/out -> "sptr"
; lpCs : CHARSETINFO* out -> "sptr"
; dwFlags : TRANSLATE_CHARSET_INFO_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 "GDI32.dll"
#cfunc global TranslateCharsetInfo "TranslateCharsetInfo" var, var, int
; res = TranslateCharsetInfo(lpSrc, lpCs, dwFlags)
; lpSrc : DWORD* in/out -> "var"
; lpCs : CHARSETINFO* out -> "var"
; dwFlags : TRANSLATE_CHARSET_INFO_FLAGS -> "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。

; BOOL TranslateCharsetInfo(DWORD* lpSrc, CHARSETINFO* lpCs, TRANSLATE_CHARSET_INFO_FLAGS dwFlags)
#uselib "GDI32.dll"
#cfunc global TranslateCharsetInfo "TranslateCharsetInfo" var, var, int
; res = TranslateCharsetInfo(lpSrc, lpCs, dwFlags)
; lpSrc : DWORD* in/out -> "var"
; lpCs : CHARSETINFO* out -> "var"
; dwFlags : TRANSLATE_CHARSET_INFO_FLAGS -> "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 (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procTranslateCharsetInfo = gdi32.NewProc("TranslateCharsetInfo")
)

// lpSrc (DWORD* in/out), lpCs (CHARSETINFO* out), dwFlags (TRANSLATE_CHARSET_INFO_FLAGS)
r1, _, err := procTranslateCharsetInfo.Call(
	uintptr(lpSrc),
	uintptr(lpCs),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function TranslateCharsetInfo(
  lpSrc: Pointer;   // DWORD* in/out
  lpCs: Pointer;   // CHARSETINFO* out
  dwFlags: DWORD   // TRANSLATE_CHARSET_INFO_FLAGS
): BOOL; stdcall;
  external 'GDI32.dll' name 'TranslateCharsetInfo';

result := DllCall("GDI32\TranslateCharsetInfo"
    , "Ptr", lpSrc   ; DWORD* in/out
    , "Ptr", lpCs   ; CHARSETINFO* out
    , "UInt", dwFlags   ; TRANSLATE_CHARSET_INFO_FLAGS
    , "Int")   ; return: BOOL

●TranslateCharsetInfo(lpSrc, lpCs, dwFlags) = DLL("GDI32.dll", "bool TranslateCharsetInfo(void*, void*, dword)")
# 呼び出し: TranslateCharsetInfo(lpSrc, lpCs, dwFlags)
# lpSrc : DWORD* in/out -> "void*"
# lpCs : CHARSETINFO* out -> "void*"
# dwFlags : TRANSLATE_CHARSET_INFO_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)。