if_indextoname

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

LPSTR if_indextoname(
    DWORD InterfaceIndex,
    LPSTR InterfaceName
);

<DllImport("IPHLPAPI.dll", ExactSpelling:=True)>
Public Shared Function if_indextoname(
    InterfaceIndex As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> InterfaceName As System.Text.StringBuilder   ' LPSTR out
) As IntPtr
End Function

' InterfaceIndex : DWORD
' InterfaceName : LPSTR out
Declare PtrSafe Function if_indextoname Lib "iphlpapi" ( _
    ByVal InterfaceIndex As Long, _
    ByVal InterfaceName As String) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

if_indextoname = ctypes.windll.iphlpapi.if_indextoname
if_indextoname.restype = wintypes.LPSTR
if_indextoname.argtypes = [
    wintypes.DWORD,  # InterfaceIndex : DWORD
    wintypes.LPSTR,  # InterfaceName : LPSTR out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IPHLPAPI.dll')
if_indextoname = Fiddle::Function.new(
  lib['if_indextoname'],
  [
    -Fiddle::TYPE_INT,  # InterfaceIndex : DWORD
    Fiddle::TYPE_VOIDP,  # InterfaceName : LPSTR out
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "iphlpapi")]
extern "system" {
    fn if_indextoname(
        InterfaceIndex: u32,  // DWORD
        InterfaceName: *mut u8  // LPSTR out
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("IPHLPAPI.dll")]
public static extern IntPtr if_indextoname(uint InterfaceIndex, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder InterfaceName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IPHLPAPI_if_indextoname' -Namespace Win32 -PassThru
# $api::if_indextoname(InterfaceIndex, InterfaceName)

#uselib "IPHLPAPI.dll"
#func global if_indextoname "if_indextoname" sptr, sptr
; if_indextoname InterfaceIndex, varptr(InterfaceName)   ; 戻り値は stat
; InterfaceIndex : DWORD -> "sptr"
; InterfaceName : LPSTR 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 if_indextoname "if_indextoname" int, var
; res = if_indextoname(InterfaceIndex, InterfaceName)
; InterfaceIndex : DWORD -> "int"
; InterfaceName : LPSTR 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。

; LPSTR if_indextoname(DWORD InterfaceIndex, LPSTR InterfaceName)
#uselib "IPHLPAPI.dll"
#cfunc global if_indextoname "if_indextoname" int, var
; res = if_indextoname(InterfaceIndex, InterfaceName)
; InterfaceIndex : DWORD -> "int"
; InterfaceName : LPSTR 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")
	procif_indextoname = iphlpapi.NewProc("if_indextoname")
)

// InterfaceIndex (DWORD), InterfaceName (LPSTR out)
r1, _, err := procif_indextoname.Call(
	uintptr(InterfaceIndex),
	uintptr(InterfaceName),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function if_indextoname(
  InterfaceIndex: DWORD;   // DWORD
  InterfaceName: PAnsiChar   // LPSTR out
): PAnsiChar; stdcall;
  external 'IPHLPAPI.dll' name 'if_indextoname';

result := DllCall("IPHLPAPI\if_indextoname"
    , "UInt", InterfaceIndex   ; DWORD
    , "Ptr", InterfaceName   ; LPSTR out
    , "Ptr")   ; return: LPSTR

●if_indextoname(InterfaceIndex, InterfaceName) = DLL("IPHLPAPI.dll", "char* if_indextoname(dword, char*)")
# 呼び出し: if_indextoname(InterfaceIndex, InterfaceName)
# InterfaceIndex : DWORD -> "dword"
# InterfaceName : LPSTR out -> "char*"
# 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)。