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。

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)。

const std = @import("std");

extern "propsys" fn PropVariantGetStringElem(
    propvar: [*c]PROPVARIANT, // PROPVARIANT*
    iElem: u32, // DWORD
    ppszVal: [*c][*c]u16 // LPWSTR* out
) callconv(std.os.windows.WINAPI) i32;

proc PropVariantGetStringElem(
    propvar: ptr PROPVARIANT,  # PROPVARIANT*
    iElem: uint32,  # DWORD
    ppszVal: ptr WideCString  # LPWSTR* out
): int32 {.importc: "PropVariantGetStringElem", stdcall, dynlib: "PROPSYS.dll".}

pragma(lib, "propsys");
extern(Windows)
int PropVariantGetStringElem(
    PROPVARIANT* propvar,   // PROPVARIANT*
    uint iElem,   // DWORD
    wchar** ppszVal   // LPWSTR* out
);

ccall((:PropVariantGetStringElem, "PROPSYS.dll"), stdcall, Int32,
      (Ptr{PROPVARIANT}, UInt32, Ptr{Ptr{UInt16}}),
      propvar, iElem, ppszVal)
# propvar : PROPVARIANT* -> Ptr{PROPVARIANT}
# iElem : DWORD -> UInt32
# ppszVal : LPWSTR* out -> Ptr{Ptr{UInt16}}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t PropVariantGetStringElem(
    void* propvar,
    uint32_t iElem,
    uint16_t** ppszVal);
]]
local propsys = ffi.load("propsys")
-- propsys.PropVariantGetStringElem(propvar, iElem, ppszVal)
-- propvar : PROPVARIANT*
-- iElem : DWORD
-- ppszVal : LPWSTR* out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('PROPSYS.dll');
const PropVariantGetStringElem = lib.func('__stdcall', 'PropVariantGetStringElem', 'int32_t', ['void *', 'uint32_t', 'void *']);
// PropVariantGetStringElem(propvar, iElem, ppszVal)
// propvar : PROPVARIANT* -> 'void *'
// iElem : DWORD -> 'uint32_t'
// ppszVal : LPWSTR* out -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("PROPSYS.dll", {
  PropVariantGetStringElem: { parameters: ["pointer", "u32", "pointer"], result: "i32" },
});
// lib.symbols.PropVariantGetStringElem(propvar, iElem, ppszVal)
// propvar : PROPVARIANT* -> "pointer"
// iElem : DWORD -> "u32"
// ppszVal : LPWSTR* out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t PropVariantGetStringElem(
    void* propvar,
    uint32_t iElem,
    uint16_t** ppszVal);
C, "PROPSYS.dll");
// $ffi->PropVariantGetStringElem(propvar, iElem, ppszVal);
// propvar : PROPVARIANT*
// iElem : DWORD
// ppszVal : LPWSTR* out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Propsys extends StdCallLibrary {
    Propsys INSTANCE = Native.load("propsys", Propsys.class);
    int PropVariantGetStringElem(
        Pointer propvar,   // PROPVARIANT*
        int iElem,   // DWORD
        PointerByReference ppszVal   // LPWSTR* out
    );
}

@[Link("propsys")]
lib LibPROPSYS
  fun PropVariantGetStringElem = PropVariantGetStringElem(
    propvar : PROPVARIANT*,   # PROPVARIANT*
    iElem : UInt32,   # DWORD
    ppszVal : UInt16**   # LPWSTR* out
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef PropVariantGetStringElemNative = Int32 Function(Pointer<Void>, Uint32, Pointer<Pointer<Utf16>>);
typedef PropVariantGetStringElemDart = int Function(Pointer<Void>, int, Pointer<Pointer<Utf16>>);
final PropVariantGetStringElem = DynamicLibrary.open('PROPSYS.dll')
    .lookupFunction<PropVariantGetStringElemNative, PropVariantGetStringElemDart>('PropVariantGetStringElem');
// propvar : PROPVARIANT* -> Pointer<Void>
// iElem : DWORD -> Uint32
// ppszVal : LPWSTR* out -> Pointer<Pointer<Utf16>>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function PropVariantGetStringElem(
  propvar: Pointer;   // PROPVARIANT*
  iElem: DWORD;   // DWORD
  ppszVal: PPWideChar   // LPWSTR* out
): Integer; stdcall;
  external 'PROPSYS.dll' name 'PropVariantGetStringElem';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "PropVariantGetStringElem"
  c_PropVariantGetStringElem :: Ptr () -> Word32 -> Ptr CWString -> IO Int32
-- propvar : PROPVARIANT* -> Ptr ()
-- iElem : DWORD -> Word32
-- ppszVal : LPWSTR* out -> Ptr CWString
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let propvariantgetstringelem =
  foreign "PropVariantGetStringElem"
    ((ptr void) @-> uint32_t @-> (ptr (ptr uint16_t)) @-> returning int32_t)
(* propvar : PROPVARIANT* -> (ptr void) *)
(* iElem : DWORD -> uint32_t *)
(* ppszVal : LPWSTR* out -> (ptr (ptr uint16_t)) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library propsys (t "PROPSYS.dll"))
(cffi:use-foreign-library propsys)

(cffi:defcfun ("PropVariantGetStringElem" prop-variant-get-string-elem :convention :stdcall) :int32
  (propvar :pointer)   ; PROPVARIANT*
  (i-elem :uint32)   ; DWORD
  (ppsz-val :pointer))   ; LPWSTR* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $PropVariantGetStringElem = Win32::API::More->new('PROPSYS',
    'int PropVariantGetStringElem(LPVOID propvar, DWORD iElem, LPVOID ppszVal)');
# my $ret = $PropVariantGetStringElem->Call($propvar, $iElem, $ppszVal);
# propvar : PROPVARIANT* -> LPVOID
# iElem : DWORD -> DWORD
# ppszVal : LPWSTR* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。