IStream_Copy

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

HRESULT IStream_Copy(
    IStream* pstmFrom,
    IStream* pstmTo,
    DWORD cb
);

<DllImport("SHLWAPI.dll", ExactSpelling:=True)>
Public Shared Function IStream_Copy(
    pstmFrom As IntPtr,   ' IStream*
    pstmTo As IntPtr,   ' IStream*
    cb As UInteger   ' DWORD
) As Integer
End Function

' pstmFrom : IStream*
' pstmTo : IStream*
' cb : DWORD
Declare PtrSafe Function IStream_Copy Lib "shlwapi" ( _
    ByVal pstmFrom As LongPtr, _
    ByVal pstmTo As LongPtr, _
    ByVal cb 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

IStream_Copy = ctypes.windll.shlwapi.IStream_Copy
IStream_Copy.restype = ctypes.c_int
IStream_Copy.argtypes = [
    ctypes.c_void_p,  # pstmFrom : IStream*
    ctypes.c_void_p,  # pstmTo : IStream*
    wintypes.DWORD,  # cb : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
IStream_Copy = Fiddle::Function.new(
  lib['IStream_Copy'],
  [
    Fiddle::TYPE_VOIDP,  # pstmFrom : IStream*
    Fiddle::TYPE_VOIDP,  # pstmTo : IStream*
    -Fiddle::TYPE_INT,  # cb : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "shlwapi")]
extern "system" {
    fn IStream_Copy(
        pstmFrom: *mut core::ffi::c_void,  // IStream*
        pstmTo: *mut core::ffi::c_void,  // IStream*
        cb: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll")]
public static extern int IStream_Copy(IntPtr pstmFrom, IntPtr pstmTo, uint cb);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_IStream_Copy' -Namespace Win32 -PassThru
# $api::IStream_Copy(pstmFrom, pstmTo, cb)

#uselib "SHLWAPI.dll"
#func global IStream_Copy "IStream_Copy" sptr, sptr, sptr
; IStream_Copy pstmFrom, pstmTo, cb   ; 戻り値は stat
; pstmFrom : IStream* -> "sptr"
; pstmTo : IStream* -> "sptr"
; cb : 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 "SHLWAPI.dll"
#cfunc global IStream_Copy "IStream_Copy" sptr, sptr, int
; res = IStream_Copy(pstmFrom, pstmTo, cb)
; pstmFrom : IStream* -> "sptr"
; pstmTo : IStream* -> "sptr"
; cb : DWORD -> "int"

; HRESULT IStream_Copy(IStream* pstmFrom, IStream* pstmTo, DWORD cb)
#uselib "SHLWAPI.dll"
#cfunc global IStream_Copy "IStream_Copy" intptr, intptr, int
; res = IStream_Copy(pstmFrom, pstmTo, cb)
; pstmFrom : IStream* -> "intptr"
; pstmTo : IStream* -> "intptr"
; cb : DWORD -> "int"

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procIStream_Copy = shlwapi.NewProc("IStream_Copy")
)

// pstmFrom (IStream*), pstmTo (IStream*), cb (DWORD)
r1, _, err := procIStream_Copy.Call(
	uintptr(pstmFrom),
	uintptr(pstmTo),
	uintptr(cb),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function IStream_Copy(
  pstmFrom: Pointer;   // IStream*
  pstmTo: Pointer;   // IStream*
  cb: DWORD   // DWORD
): Integer; stdcall;
  external 'SHLWAPI.dll' name 'IStream_Copy';

result := DllCall("SHLWAPI\IStream_Copy"
    , "Ptr", pstmFrom   ; IStream*
    , "Ptr", pstmTo   ; IStream*
    , "UInt", cb   ; DWORD
    , "Int")   ; return: HRESULT

●IStream_Copy(pstmFrom, pstmTo, cb) = DLL("SHLWAPI.dll", "int IStream_Copy(void*, void*, dword)")
# 呼び出し: IStream_Copy(pstmFrom, pstmTo, cb)
# pstmFrom : IStream* -> "void*"
# pstmTo : IStream* -> "void*"
# cb : 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)。