GetTnefStreamCodepage

// MAPI32.dll
#include <windows.h>

HRESULT GetTnefStreamCodepage(
    IStream* lpStream,
    DWORD* lpulCodepage,
    DWORD* lpulSubCodepage
);

<DllImport("MAPI32.dll", ExactSpelling:=True)>
Public Shared Function GetTnefStreamCodepage(
    lpStream As IntPtr,   ' IStream*
    ByRef lpulCodepage As UInteger,   ' DWORD* in/out
    ByRef lpulSubCodepage As UInteger   ' DWORD* in/out
) As Integer
End Function

' lpStream : IStream*
' lpulCodepage : DWORD* in/out
' lpulSubCodepage : DWORD* in/out
Declare PtrSafe Function GetTnefStreamCodepage Lib "mapi32" ( _
    ByVal lpStream As LongPtr, _
    ByRef lpulCodepage As Long, _
    ByRef lpulSubCodepage 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

GetTnefStreamCodepage = ctypes.windll.mapi32.GetTnefStreamCodepage
GetTnefStreamCodepage.restype = ctypes.c_int
GetTnefStreamCodepage.argtypes = [
    ctypes.c_void_p,  # lpStream : IStream*
    ctypes.POINTER(wintypes.DWORD),  # lpulCodepage : DWORD* in/out
    ctypes.POINTER(wintypes.DWORD),  # lpulSubCodepage : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MAPI32.dll')
GetTnefStreamCodepage = Fiddle::Function.new(
  lib['GetTnefStreamCodepage'],
  [
    Fiddle::TYPE_VOIDP,  # lpStream : IStream*
    Fiddle::TYPE_VOIDP,  # lpulCodepage : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # lpulSubCodepage : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mapi32")]
extern "system" {
    fn GetTnefStreamCodepage(
        lpStream: *mut core::ffi::c_void,  // IStream*
        lpulCodepage: *mut u32,  // DWORD* in/out
        lpulSubCodepage: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MAPI32.dll")]
public static extern int GetTnefStreamCodepage(IntPtr lpStream, ref uint lpulCodepage, ref uint lpulSubCodepage);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MAPI32_GetTnefStreamCodepage' -Namespace Win32 -PassThru
# $api::GetTnefStreamCodepage(lpStream, lpulCodepage, lpulSubCodepage)

#uselib "MAPI32.dll"
#func global GetTnefStreamCodepage "GetTnefStreamCodepage" sptr, sptr, sptr
; GetTnefStreamCodepage lpStream, varptr(lpulCodepage), varptr(lpulSubCodepage)   ; 戻り値は stat
; lpStream : IStream* -> "sptr"
; lpulCodepage : DWORD* in/out -> "sptr"
; lpulSubCodepage : DWORD* in/out -> "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 "MAPI32.dll"
#cfunc global GetTnefStreamCodepage "GetTnefStreamCodepage" sptr, var, var
; res = GetTnefStreamCodepage(lpStream, lpulCodepage, lpulSubCodepage)
; lpStream : IStream* -> "sptr"
; lpulCodepage : DWORD* in/out -> "var"
; lpulSubCodepage : DWORD* in/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。

; HRESULT GetTnefStreamCodepage(IStream* lpStream, DWORD* lpulCodepage, DWORD* lpulSubCodepage)
#uselib "MAPI32.dll"
#cfunc global GetTnefStreamCodepage "GetTnefStreamCodepage" intptr, var, var
; res = GetTnefStreamCodepage(lpStream, lpulCodepage, lpulSubCodepage)
; lpStream : IStream* -> "intptr"
; lpulCodepage : DWORD* in/out -> "var"
; lpulSubCodepage : DWORD* in/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 (
	mapi32 = windows.NewLazySystemDLL("MAPI32.dll")
	procGetTnefStreamCodepage = mapi32.NewProc("GetTnefStreamCodepage")
)

// lpStream (IStream*), lpulCodepage (DWORD* in/out), lpulSubCodepage (DWORD* in/out)
r1, _, err := procGetTnefStreamCodepage.Call(
	uintptr(lpStream),
	uintptr(lpulCodepage),
	uintptr(lpulSubCodepage),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetTnefStreamCodepage(
  lpStream: Pointer;   // IStream*
  lpulCodepage: Pointer;   // DWORD* in/out
  lpulSubCodepage: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'MAPI32.dll' name 'GetTnefStreamCodepage';

result := DllCall("MAPI32\GetTnefStreamCodepage"
    , "Ptr", lpStream   ; IStream*
    , "Ptr", lpulCodepage   ; DWORD* in/out
    , "Ptr", lpulSubCodepage   ; DWORD* in/out
    , "Int")   ; return: HRESULT

●GetTnefStreamCodepage(lpStream, lpulCodepage, lpulSubCodepage) = DLL("MAPI32.dll", "int GetTnefStreamCodepage(void*, void*, void*)")
# 呼び出し: GetTnefStreamCodepage(lpStream, lpulCodepage, lpulSubCodepage)
# lpStream : IStream* -> "void*"
# lpulCodepage : DWORD* in/out -> "void*"
# lpulSubCodepage : DWORD* in/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)。