PropVariantGetStringElem

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

HRESULT PropVariantGetStringElem(
    const PROPVARIANT* propvar,
    DWORD iElem,
    LPWSTR* ppszVal
);

<DllImport("PROPSYS.dll", ExactSpelling:=True)>
Public Shared Function PropVariantGetStringElem(
    propvar As IntPtr,   ' PROPVARIANT*
    iElem As UInteger,   ' DWORD
    ppszVal As IntPtr   ' LPWSTR* out
) As Integer
End Function

' propvar : PROPVARIANT*
' iElem : DWORD
' ppszVal : LPWSTR* out
Declare PtrSafe Function PropVariantGetStringElem Lib "propsys" ( _
    ByVal propvar As LongPtr, _
    ByVal iElem As Long, _
    ByVal ppszVal 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

PropVariantGetStringElem = ctypes.windll.propsys.PropVariantGetStringElem
PropVariantGetStringElem.restype = ctypes.c_int
PropVariantGetStringElem.argtypes = [
    ctypes.c_void_p,  # propvar : PROPVARIANT*
    wintypes.DWORD,  # iElem : DWORD
    ctypes.c_void_p,  # ppszVal : LPWSTR* out
]

require 'fiddle'
require 'fiddle/import'

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

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

$sig = @"
[DllImport("PROPSYS.dll")]
public static extern int PropVariantGetStringElem(IntPtr propvar, uint iElem, IntPtr ppszVal);
"@
$api = Add-Type -MemberDefinition $sig -Name 'PROPSYS_PropVariantGetStringElem' -Namespace Win32 -PassThru
# $api::PropVariantGetStringElem(propvar, iElem, ppszVal)

#uselib "PROPSYS.dll"
#func global PropVariantGetStringElem "PropVariantGetStringElem" sptr, sptr, sptr
; PropVariantGetStringElem varptr(propvar), iElem, varptr(ppszVal)   ; 戻り値は stat
; propvar : PROPVARIANT* -> "sptr"
; iElem : DWORD -> "sptr"
; ppszVal : LPWSTR* 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 PropVariantGetStringElem "PropVariantGetStringElem" var, int, var
; res = PropVariantGetStringElem(propvar, iElem, ppszVal)
; propvar : PROPVARIANT* -> "var"
; iElem : DWORD -> "int"
; ppszVal : LPWSTR* 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 PropVariantGetStringElem(PROPVARIANT* propvar, DWORD iElem, LPWSTR* ppszVal)
#uselib "PROPSYS.dll"
#cfunc global PropVariantGetStringElem "PropVariantGetStringElem" var, int, var
; res = PropVariantGetStringElem(propvar, iElem, ppszVal)
; propvar : PROPVARIANT* -> "var"
; iElem : DWORD -> "int"
; ppszVal : LPWSTR* 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")
	procPropVariantGetStringElem = propsys.NewProc("PropVariantGetStringElem")
)

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

function PropVariantGetStringElem(
  propvar: Pointer;   // PROPVARIANT*
  iElem: DWORD;   // DWORD
  ppszVal: PPWideChar   // LPWSTR* out
): Integer; stdcall;
  external 'PROPSYS.dll' name 'PropVariantGetStringElem';

result := DllCall("PROPSYS\PropVariantGetStringElem"
    , "Ptr", propvar   ; PROPVARIANT*
    , "UInt", iElem   ; DWORD
    , "Ptr", ppszVal   ; LPWSTR* out
    , "Int")   ; return: HRESULT

●PropVariantGetStringElem(propvar, iElem, ppszVal) = DLL("PROPSYS.dll", "int PropVariantGetStringElem(void*, dword, void*)")
# 呼び出し: PropVariantGetStringElem(propvar, iElem, ppszVal)
# propvar : PROPVARIANT* -> "void*"
# iElem : DWORD -> "dword"
# ppszVal : LPWSTR* 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)。