PropVariantToString

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

HRESULT PropVariantToString(
    const PROPVARIANT* propvar,
    LPWSTR psz,
    DWORD cch
);

<DllImport("PROPSYS.dll", ExactSpelling:=True)>
Public Shared Function PropVariantToString(
    propvar As IntPtr,   ' PROPVARIANT*
    <MarshalAs(UnmanagedType.LPWStr)> psz As System.Text.StringBuilder,   ' LPWSTR out
    cch As UInteger   ' DWORD
) As Integer
End Function

' propvar : PROPVARIANT*
' psz : LPWSTR out
' cch : DWORD
Declare PtrSafe Function PropVariantToString Lib "propsys" ( _
    ByVal propvar As LongPtr, _
    ByVal psz As LongPtr, _
    ByVal cch 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

PropVariantToString = ctypes.windll.propsys.PropVariantToString
PropVariantToString.restype = ctypes.c_int
PropVariantToString.argtypes = [
    ctypes.c_void_p,  # propvar : PROPVARIANT*
    wintypes.LPWSTR,  # psz : LPWSTR out
    wintypes.DWORD,  # cch : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PROPSYS.dll')
PropVariantToString = Fiddle::Function.new(
  lib['PropVariantToString'],
  [
    Fiddle::TYPE_VOIDP,  # propvar : PROPVARIANT*
    Fiddle::TYPE_VOIDP,  # psz : LPWSTR out
    -Fiddle::TYPE_INT,  # cch : DWORD
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("PROPSYS.dll")]
public static extern int PropVariantToString(IntPtr propvar, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder psz, uint cch);
"@
$api = Add-Type -MemberDefinition $sig -Name 'PROPSYS_PropVariantToString' -Namespace Win32 -PassThru
# $api::PropVariantToString(propvar, psz, cch)

#uselib "PROPSYS.dll"
#func global PropVariantToString "PropVariantToString" sptr, sptr, sptr
; PropVariantToString varptr(propvar), varptr(psz), cch   ; 戻り値は stat
; propvar : PROPVARIANT* -> "sptr"
; psz : LPWSTR out -> "sptr"
; cch : 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 "PROPSYS.dll"
#cfunc global PropVariantToString "PropVariantToString" var, var, int
; res = PropVariantToString(propvar, psz, cch)
; propvar : PROPVARIANT* -> "var"
; psz : LPWSTR out -> "var"
; cch : 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 PropVariantToString(PROPVARIANT* propvar, LPWSTR psz, DWORD cch)
#uselib "PROPSYS.dll"
#cfunc global PropVariantToString "PropVariantToString" var, var, int
; res = PropVariantToString(propvar, psz, cch)
; propvar : PROPVARIANT* -> "var"
; psz : LPWSTR out -> "var"
; cch : 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 (
	propsys = windows.NewLazySystemDLL("PROPSYS.dll")
	procPropVariantToString = propsys.NewProc("PropVariantToString")
)

// propvar (PROPVARIANT*), psz (LPWSTR out), cch (DWORD)
r1, _, err := procPropVariantToString.Call(
	uintptr(propvar),
	uintptr(psz),
	uintptr(cch),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function PropVariantToString(
  propvar: Pointer;   // PROPVARIANT*
  psz: PWideChar;   // LPWSTR out
  cch: DWORD   // DWORD
): Integer; stdcall;
  external 'PROPSYS.dll' name 'PropVariantToString';

result := DllCall("PROPSYS\PropVariantToString"
    , "Ptr", propvar   ; PROPVARIANT*
    , "Ptr", psz   ; LPWSTR out
    , "UInt", cch   ; DWORD
    , "Int")   ; return: HRESULT

●PropVariantToString(propvar, psz, cch) = DLL("PROPSYS.dll", "int PropVariantToString(void*, char*, dword)")
# 呼び出し: PropVariantToString(propvar, psz, cch)
# propvar : PROPVARIANT* -> "void*"
# psz : LPWSTR out -> "char*"
# cch : 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)。