PropVariantChangeType

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

HRESULT PropVariantChangeType(
    PROPVARIANT* ppropvarDest,
    const PROPVARIANT* propvarSrc,
    PROPVAR_CHANGE_FLAGS flags,
    VARENUM vt
);

<DllImport("PROPSYS.dll", ExactSpelling:=True)>
Public Shared Function PropVariantChangeType(
    ppropvarDest As IntPtr,   ' PROPVARIANT* out
    propvarSrc As IntPtr,   ' PROPVARIANT*
    flags As Integer,   ' PROPVAR_CHANGE_FLAGS
    vt As UShort   ' VARENUM
) As Integer
End Function

' ppropvarDest : PROPVARIANT* out
' propvarSrc : PROPVARIANT*
' flags : PROPVAR_CHANGE_FLAGS
' vt : VARENUM
Declare PtrSafe Function PropVariantChangeType Lib "propsys" ( _
    ByVal ppropvarDest As LongPtr, _
    ByVal propvarSrc As LongPtr, _
    ByVal flags As Long, _
    ByVal vt As Integer) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

PropVariantChangeType = ctypes.windll.propsys.PropVariantChangeType
PropVariantChangeType.restype = ctypes.c_int
PropVariantChangeType.argtypes = [
    ctypes.c_void_p,  # ppropvarDest : PROPVARIANT* out
    ctypes.c_void_p,  # propvarSrc : PROPVARIANT*
    ctypes.c_int,  # flags : PROPVAR_CHANGE_FLAGS
    ctypes.c_ushort,  # vt : VARENUM
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PROPSYS.dll')
PropVariantChangeType = Fiddle::Function.new(
  lib['PropVariantChangeType'],
  [
    Fiddle::TYPE_VOIDP,  # ppropvarDest : PROPVARIANT* out
    Fiddle::TYPE_VOIDP,  # propvarSrc : PROPVARIANT*
    Fiddle::TYPE_INT,  # flags : PROPVAR_CHANGE_FLAGS
    -Fiddle::TYPE_SHORT,  # vt : VARENUM
  ],
  Fiddle::TYPE_INT)

#[link(name = "propsys")]
extern "system" {
    fn PropVariantChangeType(
        ppropvarDest: *mut PROPVARIANT,  // PROPVARIANT* out
        propvarSrc: *const PROPVARIANT,  // PROPVARIANT*
        flags: i32,  // PROPVAR_CHANGE_FLAGS
        vt: u16  // VARENUM
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("PROPSYS.dll")]
public static extern int PropVariantChangeType(IntPtr ppropvarDest, IntPtr propvarSrc, int flags, ushort vt);
"@
$api = Add-Type -MemberDefinition $sig -Name 'PROPSYS_PropVariantChangeType' -Namespace Win32 -PassThru
# $api::PropVariantChangeType(ppropvarDest, propvarSrc, flags, vt)

#uselib "PROPSYS.dll"
#func global PropVariantChangeType "PropVariantChangeType" sptr, sptr, sptr, sptr
; PropVariantChangeType varptr(ppropvarDest), varptr(propvarSrc), flags, vt   ; 戻り値は stat
; ppropvarDest : PROPVARIANT* out -> "sptr"
; propvarSrc : PROPVARIANT* -> "sptr"
; flags : PROPVAR_CHANGE_FLAGS -> "sptr"
; vt : VARENUM -> "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 PropVariantChangeType "PropVariantChangeType" var, var, int, int
; res = PropVariantChangeType(ppropvarDest, propvarSrc, flags, vt)
; ppropvarDest : PROPVARIANT* out -> "var"
; propvarSrc : PROPVARIANT* -> "var"
; flags : PROPVAR_CHANGE_FLAGS -> "int"
; vt : VARENUM -> "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 PropVariantChangeType(PROPVARIANT* ppropvarDest, PROPVARIANT* propvarSrc, PROPVAR_CHANGE_FLAGS flags, VARENUM vt)
#uselib "PROPSYS.dll"
#cfunc global PropVariantChangeType "PropVariantChangeType" var, var, int, int
; res = PropVariantChangeType(ppropvarDest, propvarSrc, flags, vt)
; ppropvarDest : PROPVARIANT* out -> "var"
; propvarSrc : PROPVARIANT* -> "var"
; flags : PROPVAR_CHANGE_FLAGS -> "int"
; vt : VARENUM -> "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")
	procPropVariantChangeType = propsys.NewProc("PropVariantChangeType")
)

// ppropvarDest (PROPVARIANT* out), propvarSrc (PROPVARIANT*), flags (PROPVAR_CHANGE_FLAGS), vt (VARENUM)
r1, _, err := procPropVariantChangeType.Call(
	uintptr(ppropvarDest),
	uintptr(propvarSrc),
	uintptr(flags),
	uintptr(vt),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function PropVariantChangeType(
  ppropvarDest: Pointer;   // PROPVARIANT* out
  propvarSrc: Pointer;   // PROPVARIANT*
  flags: Integer;   // PROPVAR_CHANGE_FLAGS
  vt: Word   // VARENUM
): Integer; stdcall;
  external 'PROPSYS.dll' name 'PropVariantChangeType';

result := DllCall("PROPSYS\PropVariantChangeType"
    , "Ptr", ppropvarDest   ; PROPVARIANT* out
    , "Ptr", propvarSrc   ; PROPVARIANT*
    , "Int", flags   ; PROPVAR_CHANGE_FLAGS
    , "UShort", vt   ; VARENUM
    , "Int")   ; return: HRESULT

●PropVariantChangeType(ppropvarDest, propvarSrc, flags, vt) = DLL("PROPSYS.dll", "int PropVariantChangeType(void*, void*, int, int)")
# 呼び出し: PropVariantChangeType(ppropvarDest, propvarSrc, flags, vt)
# ppropvarDest : PROPVARIANT* out -> "void*"
# propvarSrc : PROPVARIANT* -> "void*"
# flags : PROPVAR_CHANGE_FLAGS -> "int"
# vt : VARENUM -> "int"
# 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)。