CoGetMarshalSizeMax

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

HRESULT CoGetMarshalSizeMax(
    DWORD* pulSize,
    const GUID* riid,
    IUnknown* pUnk,
    DWORD dwDestContext,
    void* pvDestContext,   // optional
    DWORD mshlflags
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function CoGetMarshalSizeMax(
    <Out> ByRef pulSize As UInteger,   ' DWORD* out
    ByRef riid As Guid,   ' GUID*
    pUnk As IntPtr,   ' IUnknown*
    dwDestContext As UInteger,   ' DWORD
    pvDestContext As IntPtr,   ' void* optional
    mshlflags As UInteger   ' DWORD
) As Integer
End Function

' pulSize : DWORD* out
' riid : GUID*
' pUnk : IUnknown*
' dwDestContext : DWORD
' pvDestContext : void* optional
' mshlflags : DWORD
Declare PtrSafe Function CoGetMarshalSizeMax Lib "ole32" ( _
    ByRef pulSize As Long, _
    ByVal riid As LongPtr, _
    ByVal pUnk As LongPtr, _
    ByVal dwDestContext As Long, _
    ByVal pvDestContext As LongPtr, _
    ByVal mshlflags 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

CoGetMarshalSizeMax = ctypes.windll.ole32.CoGetMarshalSizeMax
CoGetMarshalSizeMax.restype = ctypes.c_int
CoGetMarshalSizeMax.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # pulSize : DWORD* out
    ctypes.c_void_p,  # riid : GUID*
    ctypes.c_void_p,  # pUnk : IUnknown*
    wintypes.DWORD,  # dwDestContext : DWORD
    ctypes.POINTER(None),  # pvDestContext : void* optional
    wintypes.DWORD,  # mshlflags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
CoGetMarshalSizeMax = Fiddle::Function.new(
  lib['CoGetMarshalSizeMax'],
  [
    Fiddle::TYPE_VOIDP,  # pulSize : DWORD* out
    Fiddle::TYPE_VOIDP,  # riid : GUID*
    Fiddle::TYPE_VOIDP,  # pUnk : IUnknown*
    -Fiddle::TYPE_INT,  # dwDestContext : DWORD
    Fiddle::TYPE_VOIDP,  # pvDestContext : void* optional
    -Fiddle::TYPE_INT,  # mshlflags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn CoGetMarshalSizeMax(
        pulSize: *mut u32,  // DWORD* out
        riid: *const GUID,  // GUID*
        pUnk: *mut core::ffi::c_void,  // IUnknown*
        dwDestContext: u32,  // DWORD
        pvDestContext: *mut (),  // void* optional
        mshlflags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int CoGetMarshalSizeMax(out uint pulSize, ref Guid riid, IntPtr pUnk, uint dwDestContext, IntPtr pvDestContext, uint mshlflags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_CoGetMarshalSizeMax' -Namespace Win32 -PassThru
# $api::CoGetMarshalSizeMax(pulSize, riid, pUnk, dwDestContext, pvDestContext, mshlflags)

#uselib "OLE32.dll"
#func global CoGetMarshalSizeMax "CoGetMarshalSizeMax" sptr, sptr, sptr, sptr, sptr, sptr
; CoGetMarshalSizeMax varptr(pulSize), varptr(riid), pUnk, dwDestContext, pvDestContext, mshlflags   ; 戻り値は stat
; pulSize : DWORD* out -> "sptr"
; riid : GUID* -> "sptr"
; pUnk : IUnknown* -> "sptr"
; dwDestContext : DWORD -> "sptr"
; pvDestContext : void* optional -> "sptr"
; mshlflags : DWORD -> "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 CoGetMarshalSizeMax "CoGetMarshalSizeMax" var, var, sptr, int, sptr, int
; res = CoGetMarshalSizeMax(pulSize, riid, pUnk, dwDestContext, pvDestContext, mshlflags)
; pulSize : DWORD* out -> "var"
; riid : GUID* -> "var"
; pUnk : IUnknown* -> "sptr"
; dwDestContext : DWORD -> "int"
; pvDestContext : void* optional -> "sptr"
; mshlflags : DWORD -> "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。

; HRESULT CoGetMarshalSizeMax(DWORD* pulSize, GUID* riid, IUnknown* pUnk, DWORD dwDestContext, void* pvDestContext, DWORD mshlflags)
#uselib "OLE32.dll"
#cfunc global CoGetMarshalSizeMax "CoGetMarshalSizeMax" var, var, intptr, int, intptr, int
; res = CoGetMarshalSizeMax(pulSize, riid, pUnk, dwDestContext, pvDestContext, mshlflags)
; pulSize : DWORD* out -> "var"
; riid : GUID* -> "var"
; pUnk : IUnknown* -> "intptr"
; dwDestContext : DWORD -> "int"
; pvDestContext : void* optional -> "intptr"
; mshlflags : DWORD -> "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 (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procCoGetMarshalSizeMax = ole32.NewProc("CoGetMarshalSizeMax")
)

// pulSize (DWORD* out), riid (GUID*), pUnk (IUnknown*), dwDestContext (DWORD), pvDestContext (void* optional), mshlflags (DWORD)
r1, _, err := procCoGetMarshalSizeMax.Call(
	uintptr(pulSize),
	uintptr(riid),
	uintptr(pUnk),
	uintptr(dwDestContext),
	uintptr(pvDestContext),
	uintptr(mshlflags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CoGetMarshalSizeMax(
  pulSize: Pointer;   // DWORD* out
  riid: PGUID;   // GUID*
  pUnk: Pointer;   // IUnknown*
  dwDestContext: DWORD;   // DWORD
  pvDestContext: Pointer;   // void* optional
  mshlflags: DWORD   // DWORD
): Integer; stdcall;
  external 'OLE32.dll' name 'CoGetMarshalSizeMax';

result := DllCall("OLE32\CoGetMarshalSizeMax"
    , "Ptr", pulSize   ; DWORD* out
    , "Ptr", riid   ; GUID*
    , "Ptr", pUnk   ; IUnknown*
    , "UInt", dwDestContext   ; DWORD
    , "Ptr", pvDestContext   ; void* optional
    , "UInt", mshlflags   ; DWORD
    , "Int")   ; return: HRESULT

●CoGetMarshalSizeMax(pulSize, riid, pUnk, dwDestContext, pvDestContext, mshlflags) = DLL("OLE32.dll", "int CoGetMarshalSizeMax(void*, void*, void*, dword, void*, dword)")
# 呼び出し: CoGetMarshalSizeMax(pulSize, riid, pUnk, dwDestContext, pvDestContext, mshlflags)
# pulSize : DWORD* out -> "void*"
# riid : GUID* -> "void*"
# pUnk : IUnknown* -> "void*"
# dwDestContext : DWORD -> "dword"
# pvDestContext : void* optional -> "void*"
# mshlflags : DWORD -> "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)。