JsGetNullValue

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

JsErrorCode JsGetNullValue(
    void** nullValue
);

<DllImport("chakra.dll", ExactSpelling:=True)>
Public Shared Function JsGetNullValue(
    nullValue As IntPtr   ' void** out
) As UInteger
End Function

' nullValue : void** out
Declare PtrSafe Function JsGetNullValue Lib "chakra" ( _
    ByVal nullValue 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

JsGetNullValue = ctypes.windll.chakra.JsGetNullValue
JsGetNullValue.restype = wintypes.DWORD
JsGetNullValue.argtypes = [
    ctypes.c_void_p,  # nullValue : void** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('chakra.dll')
JsGetNullValue = Fiddle::Function.new(
  lib['JsGetNullValue'],
  [
    Fiddle::TYPE_VOIDP,  # nullValue : void** out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "chakra")]
extern "system" {
    fn JsGetNullValue(
        nullValue: *mut *mut ()  // void** out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("chakra.dll")]
public static extern uint JsGetNullValue(IntPtr nullValue);
"@
$api = Add-Type -MemberDefinition $sig -Name 'chakra_JsGetNullValue' -Namespace Win32 -PassThru
# $api::JsGetNullValue(nullValue)

#uselib "chakra.dll"
#func global JsGetNullValue "JsGetNullValue" sptr
; JsGetNullValue nullValue   ; 戻り値は stat
; nullValue : void** 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 "chakra.dll"
#cfunc global JsGetNullValue "JsGetNullValue" sptr
; res = JsGetNullValue(nullValue)
; nullValue : void** out -> "sptr"

; JsErrorCode JsGetNullValue(void** nullValue)
#uselib "chakra.dll"
#cfunc global JsGetNullValue "JsGetNullValue" intptr
; res = JsGetNullValue(nullValue)
; nullValue : void** out -> "intptr"

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

var (
	chakra = windows.NewLazySystemDLL("chakra.dll")
	procJsGetNullValue = chakra.NewProc("JsGetNullValue")
)

// nullValue (void** out)
r1, _, err := procJsGetNullValue.Call(
	uintptr(nullValue),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // JsErrorCode

function JsGetNullValue(
  nullValue: Pointer   // void** out
): DWORD; stdcall;
  external 'chakra.dll' name 'JsGetNullValue';

result := DllCall("chakra\JsGetNullValue"
    , "Ptr", nullValue   ; void** out
    , "UInt")   ; return: JsErrorCode

●JsGetNullValue(nullValue) = DLL("chakra.dll", "dword JsGetNullValue(void*)")
# 呼び出し: JsGetNullValue(nullValue)
# nullValue : void** 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)。