STGMEDIUM_UserSize

// OLE32.dll
#include <windows.h>

DWORD STGMEDIUM_UserSize(
    DWORD* param0,
    DWORD param1,
    STGMEDIUM* param2
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function STGMEDIUM_UserSize(
    ByRef param0 As UInteger,   ' DWORD*
    param1 As UInteger,   ' DWORD
    param2 As IntPtr   ' STGMEDIUM*
) As UInteger
End Function

' param0 : DWORD*
' param1 : DWORD
' param2 : STGMEDIUM*
Declare PtrSafe Function STGMEDIUM_UserSize Lib "ole32" ( _
    ByRef param0 As Long, _
    ByVal param1 As Long, _
    ByVal param2 As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

STGMEDIUM_UserSize = ctypes.windll.ole32.STGMEDIUM_UserSize
STGMEDIUM_UserSize.restype = wintypes.DWORD
STGMEDIUM_UserSize.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # param0 : DWORD*
    wintypes.DWORD,  # param1 : DWORD
    ctypes.c_void_p,  # param2 : STGMEDIUM*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
STGMEDIUM_UserSize = Fiddle::Function.new(
  lib['STGMEDIUM_UserSize'],
  [
    Fiddle::TYPE_VOIDP,  # param0 : DWORD*
    -Fiddle::TYPE_INT,  # param1 : DWORD
    Fiddle::TYPE_VOIDP,  # param2 : STGMEDIUM*
  ],
  -Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn STGMEDIUM_UserSize(
        param0: *mut u32,  // DWORD*
        param1: u32,  // DWORD
        param2: *mut STGMEDIUM  // STGMEDIUM*
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern uint STGMEDIUM_UserSize(ref uint param0, uint param1, IntPtr param2);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_STGMEDIUM_UserSize' -Namespace Win32 -PassThru
# $api::STGMEDIUM_UserSize(param0, param1, param2)

#uselib "OLE32.dll"
#func global STGMEDIUM_UserSize "STGMEDIUM_UserSize" sptr, sptr, sptr
; STGMEDIUM_UserSize varptr(param0), param1, varptr(param2)   ; 戻り値は stat
; param0 : DWORD* -> "sptr"
; param1 : DWORD -> "sptr"
; param2 : STGMEDIUM* -> "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 "OLE32.dll"
#cfunc global STGMEDIUM_UserSize "STGMEDIUM_UserSize" var, int, var
; res = STGMEDIUM_UserSize(param0, param1, param2)
; param0 : DWORD* -> "var"
; param1 : DWORD -> "int"
; param2 : STGMEDIUM* -> "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。

; DWORD STGMEDIUM_UserSize(DWORD* param0, DWORD param1, STGMEDIUM* param2)
#uselib "OLE32.dll"
#cfunc global STGMEDIUM_UserSize "STGMEDIUM_UserSize" var, int, var
; res = STGMEDIUM_UserSize(param0, param1, param2)
; param0 : DWORD* -> "var"
; param1 : DWORD -> "int"
; param2 : STGMEDIUM* -> "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 (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procSTGMEDIUM_UserSize = ole32.NewProc("STGMEDIUM_UserSize")
)

// param0 (DWORD*), param1 (DWORD), param2 (STGMEDIUM*)
r1, _, err := procSTGMEDIUM_UserSize.Call(
	uintptr(param0),
	uintptr(param1),
	uintptr(param2),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function STGMEDIUM_UserSize(
  param0: Pointer;   // DWORD*
  param1: DWORD;   // DWORD
  param2: Pointer   // STGMEDIUM*
): DWORD; stdcall;
  external 'OLE32.dll' name 'STGMEDIUM_UserSize';

result := DllCall("OLE32\STGMEDIUM_UserSize"
    , "Ptr", param0   ; DWORD*
    , "UInt", param1   ; DWORD
    , "Ptr", param2   ; STGMEDIUM*
    , "UInt")   ; return: DWORD

●STGMEDIUM_UserSize(param0, param1, param2) = DLL("OLE32.dll", "dword STGMEDIUM_UserSize(void*, dword, void*)")
# 呼び出し: STGMEDIUM_UserSize(param0, param1, param2)
# param0 : DWORD* -> "void*"
# param1 : DWORD -> "dword"
# param2 : STGMEDIUM* -> "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)。