CoGetMalloc

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

HRESULT CoGetMalloc(
    DWORD dwMemContext,
    IMalloc** ppMalloc
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function CoGetMalloc(
    dwMemContext As UInteger,   ' DWORD
    ppMalloc As IntPtr   ' IMalloc** out
) As Integer
End Function

' dwMemContext : DWORD
' ppMalloc : IMalloc** out
Declare PtrSafe Function CoGetMalloc Lib "ole32" ( _
    ByVal dwMemContext As Long, _
    ByVal ppMalloc 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

CoGetMalloc = ctypes.windll.ole32.CoGetMalloc
CoGetMalloc.restype = ctypes.c_int
CoGetMalloc.argtypes = [
    wintypes.DWORD,  # dwMemContext : DWORD
    ctypes.c_void_p,  # ppMalloc : IMalloc** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
CoGetMalloc = Fiddle::Function.new(
  lib['CoGetMalloc'],
  [
    -Fiddle::TYPE_INT,  # dwMemContext : DWORD
    Fiddle::TYPE_VOIDP,  # ppMalloc : IMalloc** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn CoGetMalloc(
        dwMemContext: u32,  // DWORD
        ppMalloc: *mut *mut core::ffi::c_void  // IMalloc** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int CoGetMalloc(uint dwMemContext, IntPtr ppMalloc);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_CoGetMalloc' -Namespace Win32 -PassThru
# $api::CoGetMalloc(dwMemContext, ppMalloc)

#uselib "OLE32.dll"
#func global CoGetMalloc "CoGetMalloc" sptr, sptr
; CoGetMalloc dwMemContext, ppMalloc   ; 戻り値は stat
; dwMemContext : DWORD -> "sptr"
; ppMalloc : IMalloc** 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 "OLE32.dll"
#cfunc global CoGetMalloc "CoGetMalloc" int, sptr
; res = CoGetMalloc(dwMemContext, ppMalloc)
; dwMemContext : DWORD -> "int"
; ppMalloc : IMalloc** out -> "sptr"

; HRESULT CoGetMalloc(DWORD dwMemContext, IMalloc** ppMalloc)
#uselib "OLE32.dll"
#cfunc global CoGetMalloc "CoGetMalloc" int, intptr
; res = CoGetMalloc(dwMemContext, ppMalloc)
; dwMemContext : DWORD -> "int"
; ppMalloc : IMalloc** out -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procCoGetMalloc = ole32.NewProc("CoGetMalloc")
)

// dwMemContext (DWORD), ppMalloc (IMalloc** out)
r1, _, err := procCoGetMalloc.Call(
	uintptr(dwMemContext),
	uintptr(ppMalloc),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CoGetMalloc(
  dwMemContext: DWORD;   // DWORD
  ppMalloc: Pointer   // IMalloc** out
): Integer; stdcall;
  external 'OLE32.dll' name 'CoGetMalloc';

result := DllCall("OLE32\CoGetMalloc"
    , "UInt", dwMemContext   ; DWORD
    , "Ptr", ppMalloc   ; IMalloc** out
    , "Int")   ; return: HRESULT

●CoGetMalloc(dwMemContext, ppMalloc) = DLL("OLE32.dll", "int CoGetMalloc(dword, void*)")
# 呼び出し: CoGetMalloc(dwMemContext, ppMalloc)
# dwMemContext : DWORD -> "dword"
# ppMalloc : IMalloc** 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)。