GetRTTAndHopCount

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

BOOL GetRTTAndHopCount(
    DWORD DestIpAddress,
    DWORD* HopCount,
    DWORD MaxHops,
    DWORD* RTT
);

<DllImport("IPHLPAPI.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetRTTAndHopCount(
    DestIpAddress As UInteger,   ' DWORD
    <Out> ByRef HopCount As UInteger,   ' DWORD* out
    MaxHops As UInteger,   ' DWORD
    <Out> ByRef RTT As UInteger   ' DWORD* out
) As Boolean
End Function

' DestIpAddress : DWORD
' HopCount : DWORD* out
' MaxHops : DWORD
' RTT : DWORD* out
Declare PtrSafe Function GetRTTAndHopCount Lib "iphlpapi" ( _
    ByVal DestIpAddress As Long, _
    ByRef HopCount As Long, _
    ByVal MaxHops As Long, _
    ByRef RTT 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

GetRTTAndHopCount = ctypes.windll.iphlpapi.GetRTTAndHopCount
GetRTTAndHopCount.restype = wintypes.BOOL
GetRTTAndHopCount.argtypes = [
    wintypes.DWORD,  # DestIpAddress : DWORD
    ctypes.POINTER(wintypes.DWORD),  # HopCount : DWORD* out
    wintypes.DWORD,  # MaxHops : DWORD
    ctypes.POINTER(wintypes.DWORD),  # RTT : DWORD* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IPHLPAPI.dll')
GetRTTAndHopCount = Fiddle::Function.new(
  lib['GetRTTAndHopCount'],
  [
    -Fiddle::TYPE_INT,  # DestIpAddress : DWORD
    Fiddle::TYPE_VOIDP,  # HopCount : DWORD* out
    -Fiddle::TYPE_INT,  # MaxHops : DWORD
    Fiddle::TYPE_VOIDP,  # RTT : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "iphlpapi")]
extern "system" {
    fn GetRTTAndHopCount(
        DestIpAddress: u32,  // DWORD
        HopCount: *mut u32,  // DWORD* out
        MaxHops: u32,  // DWORD
        RTT: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("IPHLPAPI.dll", SetLastError = true)]
public static extern bool GetRTTAndHopCount(uint DestIpAddress, out uint HopCount, uint MaxHops, out uint RTT);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IPHLPAPI_GetRTTAndHopCount' -Namespace Win32 -PassThru
# $api::GetRTTAndHopCount(DestIpAddress, HopCount, MaxHops, RTT)

#uselib "IPHLPAPI.dll"
#func global GetRTTAndHopCount "GetRTTAndHopCount" sptr, sptr, sptr, sptr
; GetRTTAndHopCount DestIpAddress, varptr(HopCount), MaxHops, varptr(RTT)   ; 戻り値は stat
; DestIpAddress : DWORD -> "sptr"
; HopCount : DWORD* out -> "sptr"
; MaxHops : DWORD -> "sptr"
; RTT : DWORD* 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 "IPHLPAPI.dll"
#cfunc global GetRTTAndHopCount "GetRTTAndHopCount" int, var, int, var
; res = GetRTTAndHopCount(DestIpAddress, HopCount, MaxHops, RTT)
; DestIpAddress : DWORD -> "int"
; HopCount : DWORD* out -> "var"
; MaxHops : DWORD -> "int"
; RTT : DWORD* 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。

; BOOL GetRTTAndHopCount(DWORD DestIpAddress, DWORD* HopCount, DWORD MaxHops, DWORD* RTT)
#uselib "IPHLPAPI.dll"
#cfunc global GetRTTAndHopCount "GetRTTAndHopCount" int, var, int, var
; res = GetRTTAndHopCount(DestIpAddress, HopCount, MaxHops, RTT)
; DestIpAddress : DWORD -> "int"
; HopCount : DWORD* out -> "var"
; MaxHops : DWORD -> "int"
; RTT : DWORD* 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 (
	iphlpapi = windows.NewLazySystemDLL("IPHLPAPI.dll")
	procGetRTTAndHopCount = iphlpapi.NewProc("GetRTTAndHopCount")
)

// DestIpAddress (DWORD), HopCount (DWORD* out), MaxHops (DWORD), RTT (DWORD* out)
r1, _, err := procGetRTTAndHopCount.Call(
	uintptr(DestIpAddress),
	uintptr(HopCount),
	uintptr(MaxHops),
	uintptr(RTT),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetRTTAndHopCount(
  DestIpAddress: DWORD;   // DWORD
  HopCount: Pointer;   // DWORD* out
  MaxHops: DWORD;   // DWORD
  RTT: Pointer   // DWORD* out
): BOOL; stdcall;
  external 'IPHLPAPI.dll' name 'GetRTTAndHopCount';

result := DllCall("IPHLPAPI\GetRTTAndHopCount"
    , "UInt", DestIpAddress   ; DWORD
    , "Ptr", HopCount   ; DWORD* out
    , "UInt", MaxHops   ; DWORD
    , "Ptr", RTT   ; DWORD* out
    , "Int")   ; return: BOOL

●GetRTTAndHopCount(DestIpAddress, HopCount, MaxHops, RTT) = DLL("IPHLPAPI.dll", "bool GetRTTAndHopCount(dword, void*, dword, void*)")
# 呼び出し: GetRTTAndHopCount(DestIpAddress, HopCount, MaxHops, RTT)
# DestIpAddress : DWORD -> "dword"
# HopCount : DWORD* out -> "void*"
# MaxHops : DWORD -> "dword"
# RTT : DWORD* 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)。