SetInterfaceDnsSettings

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

WIN32_ERROR SetInterfaceDnsSettings(
    GUID Interface,
    const DNS_INTERFACE_SETTINGS* Settings
);

<DllImport("IPHLPAPI.dll", ExactSpelling:=True)>
Public Shared Function SetInterfaceDnsSettings(
    [Interface] As Guid,   ' GUID
    Settings As IntPtr   ' DNS_INTERFACE_SETTINGS*
) As UInteger
End Function

' Interface : GUID
' Settings : DNS_INTERFACE_SETTINGS*
Declare PtrSafe Function SetInterfaceDnsSettings Lib "iphlpapi" ( _
    ByVal Interface As LongPtr, _
    ByVal Settings 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

SetInterfaceDnsSettings = ctypes.windll.iphlpapi.SetInterfaceDnsSettings
SetInterfaceDnsSettings.restype = wintypes.DWORD
SetInterfaceDnsSettings.argtypes = [
    ctypes.c_void_p,  # Interface : GUID
    ctypes.c_void_p,  # Settings : DNS_INTERFACE_SETTINGS*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IPHLPAPI.dll')
SetInterfaceDnsSettings = Fiddle::Function.new(
  lib['SetInterfaceDnsSettings'],
  [
    Fiddle::TYPE_VOIDP,  # Interface : GUID
    Fiddle::TYPE_VOIDP,  # Settings : DNS_INTERFACE_SETTINGS*
  ],
  -Fiddle::TYPE_INT)

#[link(name = "iphlpapi")]
extern "system" {
    fn SetInterfaceDnsSettings(
        Interface: GUID,  // GUID
        Settings: *const DNS_INTERFACE_SETTINGS  // DNS_INTERFACE_SETTINGS*
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("IPHLPAPI.dll")]
public static extern uint SetInterfaceDnsSettings(Guid Interface, IntPtr Settings);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IPHLPAPI_SetInterfaceDnsSettings' -Namespace Win32 -PassThru
# $api::SetInterfaceDnsSettings(Interface, Settings)

#uselib "IPHLPAPI.dll"
#func global SetInterfaceDnsSettings "SetInterfaceDnsSettings" sptr, sptr
; SetInterfaceDnsSettings Interface, varptr(Settings)   ; 戻り値は stat
; Interface : GUID -> "sptr"
; Settings : DNS_INTERFACE_SETTINGS* -> "sptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 SetInterfaceDnsSettings "SetInterfaceDnsSettings" int, var
; res = SetInterfaceDnsSettings(Interface, Settings)
; Interface : GUID -> "int"
; Settings : DNS_INTERFACE_SETTINGS* -> "var"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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。

; WIN32_ERROR SetInterfaceDnsSettings(GUID Interface, DNS_INTERFACE_SETTINGS* Settings)
#uselib "IPHLPAPI.dll"
#cfunc global SetInterfaceDnsSettings "SetInterfaceDnsSettings" int, var
; res = SetInterfaceDnsSettings(Interface, Settings)
; Interface : GUID -> "int"
; Settings : DNS_INTERFACE_SETTINGS* -> "var"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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")
	procSetInterfaceDnsSettings = iphlpapi.NewProc("SetInterfaceDnsSettings")
)

// Interface (GUID), Settings (DNS_INTERFACE_SETTINGS*)
r1, _, err := procSetInterfaceDnsSettings.Call(
	uintptr(Interface),
	uintptr(Settings),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function SetInterfaceDnsSettings(
  Interface: TGUID;   // GUID
  Settings: Pointer   // DNS_INTERFACE_SETTINGS*
): DWORD; stdcall;
  external 'IPHLPAPI.dll' name 'SetInterfaceDnsSettings';

result := DllCall("IPHLPAPI\SetInterfaceDnsSettings"
    , "Ptr", Interface   ; GUID
    , "Ptr", Settings   ; DNS_INTERFACE_SETTINGS*
    , "UInt")   ; return: WIN32_ERROR

●SetInterfaceDnsSettings(Interface, Settings) = DLL("IPHLPAPI.dll", "dword SetInterfaceDnsSettings(void*, void*)")
# 呼び出し: SetInterfaceDnsSettings(Interface, Settings)
# Interface : GUID -> "void*"
# Settings : DNS_INTERFACE_SETTINGS* -> "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)。