RtmAddNextHop

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

DWORD RtmAddNextHop(
    INT_PTR RtmRegHandle,
    RTM_NEXTHOP_INFO* NextHopInfo,
    INT_PTR* NextHopHandle,
    DWORD* ChangeFlags
);

<DllImport("rtm.dll", ExactSpelling:=True)>
Public Shared Function RtmAddNextHop(
    RtmRegHandle As IntPtr,   ' INT_PTR
    NextHopInfo As IntPtr,   ' RTM_NEXTHOP_INFO* in/out
    ByRef NextHopHandle As IntPtr,   ' INT_PTR* in/out
    ByRef ChangeFlags As UInteger   ' DWORD* in/out
) As UInteger
End Function

' RtmRegHandle : INT_PTR
' NextHopInfo : RTM_NEXTHOP_INFO* in/out
' NextHopHandle : INT_PTR* in/out
' ChangeFlags : DWORD* in/out
Declare PtrSafe Function RtmAddNextHop Lib "rtm" ( _
    ByVal RtmRegHandle As LongPtr, _
    ByVal NextHopInfo As LongPtr, _
    ByRef NextHopHandle As LongPtr, _
    ByRef ChangeFlags As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

RtmAddNextHop = ctypes.windll.rtm.RtmAddNextHop
RtmAddNextHop.restype = wintypes.DWORD
RtmAddNextHop.argtypes = [
    ctypes.c_ssize_t,  # RtmRegHandle : INT_PTR
    ctypes.c_void_p,  # NextHopInfo : RTM_NEXTHOP_INFO* in/out
    ctypes.POINTER(ctypes.c_ssize_t),  # NextHopHandle : INT_PTR* in/out
    ctypes.POINTER(wintypes.DWORD),  # ChangeFlags : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('rtm.dll')
RtmAddNextHop = Fiddle::Function.new(
  lib['RtmAddNextHop'],
  [
    Fiddle::TYPE_INTPTR_T,  # RtmRegHandle : INT_PTR
    Fiddle::TYPE_VOIDP,  # NextHopInfo : RTM_NEXTHOP_INFO* in/out
    Fiddle::TYPE_VOIDP,  # NextHopHandle : INT_PTR* in/out
    Fiddle::TYPE_VOIDP,  # ChangeFlags : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "rtm")]
extern "system" {
    fn RtmAddNextHop(
        RtmRegHandle: isize,  // INT_PTR
        NextHopInfo: *mut RTM_NEXTHOP_INFO,  // RTM_NEXTHOP_INFO* in/out
        NextHopHandle: *mut isize,  // INT_PTR* in/out
        ChangeFlags: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("rtm.dll")]
public static extern uint RtmAddNextHop(IntPtr RtmRegHandle, IntPtr NextHopInfo, ref IntPtr NextHopHandle, ref uint ChangeFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'rtm_RtmAddNextHop' -Namespace Win32 -PassThru
# $api::RtmAddNextHop(RtmRegHandle, NextHopInfo, NextHopHandle, ChangeFlags)

#uselib "rtm.dll"
#func global RtmAddNextHop "RtmAddNextHop" sptr, sptr, sptr, sptr
; RtmAddNextHop RtmRegHandle, varptr(NextHopInfo), varptr(NextHopHandle), varptr(ChangeFlags)   ; 戻り値は stat
; RtmRegHandle : INT_PTR -> "sptr"
; NextHopInfo : RTM_NEXTHOP_INFO* in/out -> "sptr"
; NextHopHandle : INT_PTR* in/out -> "sptr"
; ChangeFlags : DWORD* in/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 "rtm.dll"
#cfunc global RtmAddNextHop "RtmAddNextHop" sptr, var, var, var
; res = RtmAddNextHop(RtmRegHandle, NextHopInfo, NextHopHandle, ChangeFlags)
; RtmRegHandle : INT_PTR -> "sptr"
; NextHopInfo : RTM_NEXTHOP_INFO* in/out -> "var"
; NextHopHandle : INT_PTR* in/out -> "var"
; ChangeFlags : DWORD* in/out -> "var"
; ※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 RtmAddNextHop(INT_PTR RtmRegHandle, RTM_NEXTHOP_INFO* NextHopInfo, INT_PTR* NextHopHandle, DWORD* ChangeFlags)
#uselib "rtm.dll"
#cfunc global RtmAddNextHop "RtmAddNextHop" intptr, var, var, var
; res = RtmAddNextHop(RtmRegHandle, NextHopInfo, NextHopHandle, ChangeFlags)
; RtmRegHandle : INT_PTR -> "intptr"
; NextHopInfo : RTM_NEXTHOP_INFO* in/out -> "var"
; NextHopHandle : INT_PTR* in/out -> "var"
; ChangeFlags : DWORD* in/out -> "var"
; ※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 (
	rtm = windows.NewLazySystemDLL("rtm.dll")
	procRtmAddNextHop = rtm.NewProc("RtmAddNextHop")
)

// RtmRegHandle (INT_PTR), NextHopInfo (RTM_NEXTHOP_INFO* in/out), NextHopHandle (INT_PTR* in/out), ChangeFlags (DWORD* in/out)
r1, _, err := procRtmAddNextHop.Call(
	uintptr(RtmRegHandle),
	uintptr(NextHopInfo),
	uintptr(NextHopHandle),
	uintptr(ChangeFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function RtmAddNextHop(
  RtmRegHandle: NativeInt;   // INT_PTR
  NextHopInfo: Pointer;   // RTM_NEXTHOP_INFO* in/out
  NextHopHandle: Pointer;   // INT_PTR* in/out
  ChangeFlags: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'rtm.dll' name 'RtmAddNextHop';

result := DllCall("rtm\RtmAddNextHop"
    , "Ptr", RtmRegHandle   ; INT_PTR
    , "Ptr", NextHopInfo   ; RTM_NEXTHOP_INFO* in/out
    , "Ptr", NextHopHandle   ; INT_PTR* in/out
    , "Ptr", ChangeFlags   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●RtmAddNextHop(RtmRegHandle, NextHopInfo, NextHopHandle, ChangeFlags) = DLL("rtm.dll", "dword RtmAddNextHop(int, void*, void*, void*)")
# 呼び出し: RtmAddNextHop(RtmRegHandle, NextHopInfo, NextHopHandle, ChangeFlags)
# RtmRegHandle : INT_PTR -> "int"
# NextHopInfo : RTM_NEXTHOP_INFO* in/out -> "void*"
# NextHopHandle : INT_PTR* in/out -> "void*"
# ChangeFlags : DWORD* in/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)。