SniffStream

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

HRESULT SniffStream(
    IStream* pInStream,
    DWORD* pnFormat,
    IStream** ppOutStream
);

<DllImport("ImgUtil.dll", ExactSpelling:=True)>
Public Shared Function SniffStream(
    pInStream As IntPtr,   ' IStream*
    ByRef pnFormat As UInteger,   ' DWORD* in/out
    ppOutStream As IntPtr   ' IStream** out
) As Integer
End Function

' pInStream : IStream*
' pnFormat : DWORD* in/out
' ppOutStream : IStream** out
Declare PtrSafe Function SniffStream Lib "imgutil" ( _
    ByVal pInStream As LongPtr, _
    ByRef pnFormat As Long, _
    ByVal ppOutStream 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

SniffStream = ctypes.windll.imgutil.SniffStream
SniffStream.restype = ctypes.c_int
SniffStream.argtypes = [
    ctypes.c_void_p,  # pInStream : IStream*
    ctypes.POINTER(wintypes.DWORD),  # pnFormat : DWORD* in/out
    ctypes.c_void_p,  # ppOutStream : IStream** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ImgUtil.dll')
SniffStream = Fiddle::Function.new(
  lib['SniffStream'],
  [
    Fiddle::TYPE_VOIDP,  # pInStream : IStream*
    Fiddle::TYPE_VOIDP,  # pnFormat : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # ppOutStream : IStream** out
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("ImgUtil.dll")]
public static extern int SniffStream(IntPtr pInStream, ref uint pnFormat, IntPtr ppOutStream);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ImgUtil_SniffStream' -Namespace Win32 -PassThru
# $api::SniffStream(pInStream, pnFormat, ppOutStream)

#uselib "ImgUtil.dll"
#func global SniffStream "SniffStream" sptr, sptr, sptr
; SniffStream pInStream, varptr(pnFormat), ppOutStream   ; 戻り値は stat
; pInStream : IStream* -> "sptr"
; pnFormat : DWORD* in/out -> "sptr"
; ppOutStream : IStream** 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 "ImgUtil.dll"
#cfunc global SniffStream "SniffStream" sptr, var, sptr
; res = SniffStream(pInStream, pnFormat, ppOutStream)
; pInStream : IStream* -> "sptr"
; pnFormat : DWORD* in/out -> "var"
; ppOutStream : IStream** out -> "sptr"
; ※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 SniffStream(IStream* pInStream, DWORD* pnFormat, IStream** ppOutStream)
#uselib "ImgUtil.dll"
#cfunc global SniffStream "SniffStream" intptr, var, intptr
; res = SniffStream(pInStream, pnFormat, ppOutStream)
; pInStream : IStream* -> "intptr"
; pnFormat : DWORD* in/out -> "var"
; ppOutStream : IStream** out -> "intptr"
; ※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 (
	imgutil = windows.NewLazySystemDLL("ImgUtil.dll")
	procSniffStream = imgutil.NewProc("SniffStream")
)

// pInStream (IStream*), pnFormat (DWORD* in/out), ppOutStream (IStream** out)
r1, _, err := procSniffStream.Call(
	uintptr(pInStream),
	uintptr(pnFormat),
	uintptr(ppOutStream),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SniffStream(
  pInStream: Pointer;   // IStream*
  pnFormat: Pointer;   // DWORD* in/out
  ppOutStream: Pointer   // IStream** out
): Integer; stdcall;
  external 'ImgUtil.dll' name 'SniffStream';

result := DllCall("ImgUtil\SniffStream"
    , "Ptr", pInStream   ; IStream*
    , "Ptr", pnFormat   ; DWORD* in/out
    , "Ptr", ppOutStream   ; IStream** out
    , "Int")   ; return: HRESULT

●SniffStream(pInStream, pnFormat, ppOutStream) = DLL("ImgUtil.dll", "int SniffStream(void*, void*, void*)")
# 呼び出し: SniffStream(pInStream, pnFormat, ppOutStream)
# pInStream : IStream* -> "void*"
# pnFormat : DWORD* in/out -> "void*"
# ppOutStream : IStream** 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)。