DecodePointer

// KERNEL32.dll
#include <windows.h>

void* DecodePointer(
    void* Ptr   // optional
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function DecodePointer(
    Ptr As IntPtr   ' void* optional
) As IntPtr
End Function

' Ptr : void* optional
Declare PtrSafe Function DecodePointer Lib "kernel32" ( _
    ByVal Ptr As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DecodePointer = ctypes.windll.kernel32.DecodePointer
DecodePointer.restype = ctypes.c_void_p
DecodePointer.argtypes = [
    ctypes.POINTER(None),  # Ptr : void* optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
DecodePointer = Fiddle::Function.new(
  lib['DecodePointer'],
  [
    Fiddle::TYPE_VOIDP,  # Ptr : void* optional
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "kernel32")]
extern "system" {
    fn DecodePointer(
        Ptr: *mut ()  // void* optional
    ) -> *mut ();
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll")]
public static extern IntPtr DecodePointer(IntPtr Ptr);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_DecodePointer' -Namespace Win32 -PassThru
# $api::DecodePointer(Ptr)

#uselib "KERNEL32.dll"
#func global DecodePointer "DecodePointer" sptr
; DecodePointer Ptr   ; 戻り値は stat
; Ptr : void* optional -> "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 "KERNEL32.dll"
#cfunc global DecodePointer "DecodePointer" sptr
; res = DecodePointer(Ptr)
; Ptr : void* optional -> "sptr"

; void* DecodePointer(void* Ptr)
#uselib "KERNEL32.dll"
#cfunc global DecodePointer "DecodePointer" intptr
; res = DecodePointer(Ptr)
; Ptr : void* optional -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procDecodePointer = kernel32.NewProc("DecodePointer")
)

// Ptr (void* optional)
r1, _, err := procDecodePointer.Call(
	uintptr(Ptr),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void*

function DecodePointer(
  Ptr: Pointer   // void* optional
): Pointer; stdcall;
  external 'KERNEL32.dll' name 'DecodePointer';

result := DllCall("KERNEL32\DecodePointer"
    , "Ptr", Ptr   ; void* optional
    , "Ptr")   ; return: void*

●DecodePointer(Ptr) = DLL("KERNEL32.dll", "void* DecodePointer(void*)")
# 呼び出し: DecodePointer(Ptr)
# Ptr : void* optional -> "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)。