PxeDhcpv6GetOptionValue

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

DWORD PxeDhcpv6GetOptionValue(
    void* pPacket,
    DWORD uPacketLen,
    DWORD uInstance,
    WORD wOption,
    WORD* pwOptionLen,   // optional
    void** ppOptionValue   // optional
);

<DllImport("WDSPXE.dll", ExactSpelling:=True)>
Public Shared Function PxeDhcpv6GetOptionValue(
    pPacket As IntPtr,   ' void*
    uPacketLen As UInteger,   ' DWORD
    uInstance As UInteger,   ' DWORD
    wOption As UShort,   ' WORD
    pwOptionLen As IntPtr,   ' WORD* optional, out
    ppOptionValue As IntPtr   ' void** optional, out
) As UInteger
End Function

' pPacket : void*
' uPacketLen : DWORD
' uInstance : DWORD
' wOption : WORD
' pwOptionLen : WORD* optional, out
' ppOptionValue : void** optional, out
Declare PtrSafe Function PxeDhcpv6GetOptionValue Lib "wdspxe" ( _
    ByVal pPacket As LongPtr, _
    ByVal uPacketLen As Long, _
    ByVal uInstance As Long, _
    ByVal wOption As Integer, _
    ByVal pwOptionLen As LongPtr, _
    ByVal ppOptionValue 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

PxeDhcpv6GetOptionValue = ctypes.windll.wdspxe.PxeDhcpv6GetOptionValue
PxeDhcpv6GetOptionValue.restype = wintypes.DWORD
PxeDhcpv6GetOptionValue.argtypes = [
    ctypes.POINTER(None),  # pPacket : void*
    wintypes.DWORD,  # uPacketLen : DWORD
    wintypes.DWORD,  # uInstance : DWORD
    ctypes.c_ushort,  # wOption : WORD
    ctypes.POINTER(ctypes.c_ushort),  # pwOptionLen : WORD* optional, out
    ctypes.c_void_p,  # ppOptionValue : void** optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WDSPXE.dll')
PxeDhcpv6GetOptionValue = Fiddle::Function.new(
  lib['PxeDhcpv6GetOptionValue'],
  [
    Fiddle::TYPE_VOIDP,  # pPacket : void*
    -Fiddle::TYPE_INT,  # uPacketLen : DWORD
    -Fiddle::TYPE_INT,  # uInstance : DWORD
    -Fiddle::TYPE_SHORT,  # wOption : WORD
    Fiddle::TYPE_VOIDP,  # pwOptionLen : WORD* optional, out
    Fiddle::TYPE_VOIDP,  # ppOptionValue : void** optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "wdspxe")]
extern "system" {
    fn PxeDhcpv6GetOptionValue(
        pPacket: *mut (),  // void*
        uPacketLen: u32,  // DWORD
        uInstance: u32,  // DWORD
        wOption: u16,  // WORD
        pwOptionLen: *mut u16,  // WORD* optional, out
        ppOptionValue: *mut *mut ()  // void** optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WDSPXE.dll")]
public static extern uint PxeDhcpv6GetOptionValue(IntPtr pPacket, uint uPacketLen, uint uInstance, ushort wOption, IntPtr pwOptionLen, IntPtr ppOptionValue);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WDSPXE_PxeDhcpv6GetOptionValue' -Namespace Win32 -PassThru
# $api::PxeDhcpv6GetOptionValue(pPacket, uPacketLen, uInstance, wOption, pwOptionLen, ppOptionValue)

#uselib "WDSPXE.dll"
#func global PxeDhcpv6GetOptionValue "PxeDhcpv6GetOptionValue" sptr, sptr, sptr, sptr, sptr, sptr
; PxeDhcpv6GetOptionValue pPacket, uPacketLen, uInstance, wOption, varptr(pwOptionLen), ppOptionValue   ; 戻り値は stat
; pPacket : void* -> "sptr"
; uPacketLen : DWORD -> "sptr"
; uInstance : DWORD -> "sptr"
; wOption : WORD -> "sptr"
; pwOptionLen : WORD* optional, out -> "sptr"
; ppOptionValue : void** optional, 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 "WDSPXE.dll"
#cfunc global PxeDhcpv6GetOptionValue "PxeDhcpv6GetOptionValue" sptr, int, int, int, var, sptr
; res = PxeDhcpv6GetOptionValue(pPacket, uPacketLen, uInstance, wOption, pwOptionLen, ppOptionValue)
; pPacket : void* -> "sptr"
; uPacketLen : DWORD -> "int"
; uInstance : DWORD -> "int"
; wOption : WORD -> "int"
; pwOptionLen : WORD* optional, out -> "var"
; ppOptionValue : void** optional, out -> "sptr"
; ※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。

; DWORD PxeDhcpv6GetOptionValue(void* pPacket, DWORD uPacketLen, DWORD uInstance, WORD wOption, WORD* pwOptionLen, void** ppOptionValue)
#uselib "WDSPXE.dll"
#cfunc global PxeDhcpv6GetOptionValue "PxeDhcpv6GetOptionValue" intptr, int, int, int, var, intptr
; res = PxeDhcpv6GetOptionValue(pPacket, uPacketLen, uInstance, wOption, pwOptionLen, ppOptionValue)
; pPacket : void* -> "intptr"
; uPacketLen : DWORD -> "int"
; uInstance : DWORD -> "int"
; wOption : WORD -> "int"
; pwOptionLen : WORD* optional, out -> "var"
; ppOptionValue : void** optional, out -> "intptr"
; ※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 (
	wdspxe = windows.NewLazySystemDLL("WDSPXE.dll")
	procPxeDhcpv6GetOptionValue = wdspxe.NewProc("PxeDhcpv6GetOptionValue")
)

// pPacket (void*), uPacketLen (DWORD), uInstance (DWORD), wOption (WORD), pwOptionLen (WORD* optional, out), ppOptionValue (void** optional, out)
r1, _, err := procPxeDhcpv6GetOptionValue.Call(
	uintptr(pPacket),
	uintptr(uPacketLen),
	uintptr(uInstance),
	uintptr(wOption),
	uintptr(pwOptionLen),
	uintptr(ppOptionValue),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function PxeDhcpv6GetOptionValue(
  pPacket: Pointer;   // void*
  uPacketLen: DWORD;   // DWORD
  uInstance: DWORD;   // DWORD
  wOption: Word;   // WORD
  pwOptionLen: Pointer;   // WORD* optional, out
  ppOptionValue: Pointer   // void** optional, out
): DWORD; stdcall;
  external 'WDSPXE.dll' name 'PxeDhcpv6GetOptionValue';

result := DllCall("WDSPXE\PxeDhcpv6GetOptionValue"
    , "Ptr", pPacket   ; void*
    , "UInt", uPacketLen   ; DWORD
    , "UInt", uInstance   ; DWORD
    , "UShort", wOption   ; WORD
    , "Ptr", pwOptionLen   ; WORD* optional, out
    , "Ptr", ppOptionValue   ; void** optional, out
    , "UInt")   ; return: DWORD

●PxeDhcpv6GetOptionValue(pPacket, uPacketLen, uInstance, wOption, pwOptionLen, ppOptionValue) = DLL("WDSPXE.dll", "dword PxeDhcpv6GetOptionValue(void*, dword, dword, int, void*, void*)")
# 呼び出し: PxeDhcpv6GetOptionValue(pPacket, uPacketLen, uInstance, wOption, pwOptionLen, ppOptionValue)
# pPacket : void* -> "void*"
# uPacketLen : DWORD -> "dword"
# uInstance : DWORD -> "dword"
# wOption : WORD -> "int"
# pwOptionLen : WORD* optional, out -> "void*"
# ppOptionValue : void** optional, 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)。