VariantToStringArrayAlloc

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

HRESULT VariantToStringArrayAlloc(
    const VARIANT* var,
    LPWSTR** pprgsz,
    DWORD* pcElem
);

<DllImport("PROPSYS.dll", ExactSpelling:=True)>
Public Shared Function VariantToStringArrayAlloc(
    var As IntPtr,   ' VARIANT*
    pprgsz As IntPtr,   ' LPWSTR** out
    <Out> ByRef pcElem As UInteger   ' DWORD* out
) As Integer
End Function

' var : VARIANT*
' pprgsz : LPWSTR** out
' pcElem : DWORD* out
Declare PtrSafe Function VariantToStringArrayAlloc Lib "propsys" ( _
    ByVal var As LongPtr, _
    ByVal pprgsz As LongPtr, _
    ByRef pcElem 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

VariantToStringArrayAlloc = ctypes.windll.propsys.VariantToStringArrayAlloc
VariantToStringArrayAlloc.restype = ctypes.c_int
VariantToStringArrayAlloc.argtypes = [
    ctypes.c_void_p,  # var : VARIANT*
    ctypes.c_void_p,  # pprgsz : LPWSTR** out
    ctypes.POINTER(wintypes.DWORD),  # pcElem : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PROPSYS.dll')
VariantToStringArrayAlloc = Fiddle::Function.new(
  lib['VariantToStringArrayAlloc'],
  [
    Fiddle::TYPE_VOIDP,  # var : VARIANT*
    Fiddle::TYPE_VOIDP,  # pprgsz : LPWSTR** out
    Fiddle::TYPE_VOIDP,  # pcElem : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "propsys")]
extern "system" {
    fn VariantToStringArrayAlloc(
        var: *const VARIANT,  // VARIANT*
        pprgsz: *mut *mut *mut u16,  // LPWSTR** out
        pcElem: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("PROPSYS.dll")]
public static extern int VariantToStringArrayAlloc(IntPtr var, IntPtr pprgsz, out uint pcElem);
"@
$api = Add-Type -MemberDefinition $sig -Name 'PROPSYS_VariantToStringArrayAlloc' -Namespace Win32 -PassThru
# $api::VariantToStringArrayAlloc(var, pprgsz, pcElem)

#uselib "PROPSYS.dll"
#func global VariantToStringArrayAlloc "VariantToStringArrayAlloc" sptr, sptr, sptr
; VariantToStringArrayAlloc varptr(var), varptr(pprgsz), varptr(pcElem)   ; 戻り値は stat
; var : VARIANT* -> "sptr"
; pprgsz : LPWSTR** out -> "sptr"
; pcElem : DWORD* 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 "PROPSYS.dll"
#cfunc global VariantToStringArrayAlloc "VariantToStringArrayAlloc" var, var, var
; res = VariantToStringArrayAlloc(var, pprgsz, pcElem)
; var : VARIANT* -> "var"
; pprgsz : LPWSTR** out -> "var"
; pcElem : DWORD* out -> "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。

; HRESULT VariantToStringArrayAlloc(VARIANT* var, LPWSTR** pprgsz, DWORD* pcElem)
#uselib "PROPSYS.dll"
#cfunc global VariantToStringArrayAlloc "VariantToStringArrayAlloc" var, var, var
; res = VariantToStringArrayAlloc(var, pprgsz, pcElem)
; var : VARIANT* -> "var"
; pprgsz : LPWSTR** out -> "var"
; pcElem : DWORD* out -> "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 (
	propsys = windows.NewLazySystemDLL("PROPSYS.dll")
	procVariantToStringArrayAlloc = propsys.NewProc("VariantToStringArrayAlloc")
)

// var (VARIANT*), pprgsz (LPWSTR** out), pcElem (DWORD* out)
r1, _, err := procVariantToStringArrayAlloc.Call(
	uintptr(var),
	uintptr(pprgsz),
	uintptr(pcElem),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VariantToStringArrayAlloc(
  var: Pointer;   // VARIANT*
  pprgsz: PPWideChar;   // LPWSTR** out
  pcElem: Pointer   // DWORD* out
): Integer; stdcall;
  external 'PROPSYS.dll' name 'VariantToStringArrayAlloc';

result := DllCall("PROPSYS\VariantToStringArrayAlloc"
    , "Ptr", var   ; VARIANT*
    , "Ptr", pprgsz   ; LPWSTR** out
    , "Ptr", pcElem   ; DWORD* out
    , "Int")   ; return: HRESULT

●VariantToStringArrayAlloc(var, pprgsz, pcElem) = DLL("PROPSYS.dll", "int VariantToStringArrayAlloc(void*, void*, void*)")
# 呼び出し: VariantToStringArrayAlloc(var, pprgsz, pcElem)
# var : VARIANT* -> "void*"
# pprgsz : LPWSTR** out -> "void*"
# pcElem : DWORD* 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)。