DnsSetApplicationSettings

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

DWORD DnsSetApplicationSettings(
    DWORD cServers,
    const DNS_CUSTOM_SERVER* pServers,
    const DNS_APPLICATION_SETTINGS* pSettings   // optional
);

<DllImport("DNSAPI.dll", ExactSpelling:=True)>
Public Shared Function DnsSetApplicationSettings(
    cServers As UInteger,   ' DWORD
    pServers As IntPtr,   ' DNS_CUSTOM_SERVER*
    pSettings As IntPtr   ' DNS_APPLICATION_SETTINGS* optional
) As UInteger
End Function

' cServers : DWORD
' pServers : DNS_CUSTOM_SERVER*
' pSettings : DNS_APPLICATION_SETTINGS* optional
Declare PtrSafe Function DnsSetApplicationSettings Lib "dnsapi" ( _
    ByVal cServers As Long, _
    ByVal pServers As LongPtr, _
    ByVal pSettings 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

DnsSetApplicationSettings = ctypes.windll.dnsapi.DnsSetApplicationSettings
DnsSetApplicationSettings.restype = wintypes.DWORD
DnsSetApplicationSettings.argtypes = [
    wintypes.DWORD,  # cServers : DWORD
    ctypes.c_void_p,  # pServers : DNS_CUSTOM_SERVER*
    ctypes.c_void_p,  # pSettings : DNS_APPLICATION_SETTINGS* optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DNSAPI.dll')
DnsSetApplicationSettings = Fiddle::Function.new(
  lib['DnsSetApplicationSettings'],
  [
    -Fiddle::TYPE_INT,  # cServers : DWORD
    Fiddle::TYPE_VOIDP,  # pServers : DNS_CUSTOM_SERVER*
    Fiddle::TYPE_VOIDP,  # pSettings : DNS_APPLICATION_SETTINGS* optional
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dnsapi")]
extern "system" {
    fn DnsSetApplicationSettings(
        cServers: u32,  // DWORD
        pServers: *const DNS_CUSTOM_SERVER,  // DNS_CUSTOM_SERVER*
        pSettings: *const DNS_APPLICATION_SETTINGS  // DNS_APPLICATION_SETTINGS* optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DNSAPI.dll")]
public static extern uint DnsSetApplicationSettings(uint cServers, IntPtr pServers, IntPtr pSettings);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DNSAPI_DnsSetApplicationSettings' -Namespace Win32 -PassThru
# $api::DnsSetApplicationSettings(cServers, pServers, pSettings)

#uselib "DNSAPI.dll"
#func global DnsSetApplicationSettings "DnsSetApplicationSettings" sptr, sptr, sptr
; DnsSetApplicationSettings cServers, varptr(pServers), varptr(pSettings)   ; 戻り値は stat
; cServers : DWORD -> "sptr"
; pServers : DNS_CUSTOM_SERVER* -> "sptr"
; pSettings : DNS_APPLICATION_SETTINGS* optional -> "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 "DNSAPI.dll"
#cfunc global DnsSetApplicationSettings "DnsSetApplicationSettings" int, var, var
; res = DnsSetApplicationSettings(cServers, pServers, pSettings)
; cServers : DWORD -> "int"
; pServers : DNS_CUSTOM_SERVER* -> "var"
; pSettings : DNS_APPLICATION_SETTINGS* optional -> "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 DnsSetApplicationSettings(DWORD cServers, DNS_CUSTOM_SERVER* pServers, DNS_APPLICATION_SETTINGS* pSettings)
#uselib "DNSAPI.dll"
#cfunc global DnsSetApplicationSettings "DnsSetApplicationSettings" int, var, var
; res = DnsSetApplicationSettings(cServers, pServers, pSettings)
; cServers : DWORD -> "int"
; pServers : DNS_CUSTOM_SERVER* -> "var"
; pSettings : DNS_APPLICATION_SETTINGS* optional -> "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 (
	dnsapi = windows.NewLazySystemDLL("DNSAPI.dll")
	procDnsSetApplicationSettings = dnsapi.NewProc("DnsSetApplicationSettings")
)

// cServers (DWORD), pServers (DNS_CUSTOM_SERVER*), pSettings (DNS_APPLICATION_SETTINGS* optional)
r1, _, err := procDnsSetApplicationSettings.Call(
	uintptr(cServers),
	uintptr(pServers),
	uintptr(pSettings),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DnsSetApplicationSettings(
  cServers: DWORD;   // DWORD
  pServers: Pointer;   // DNS_CUSTOM_SERVER*
  pSettings: Pointer   // DNS_APPLICATION_SETTINGS* optional
): DWORD; stdcall;
  external 'DNSAPI.dll' name 'DnsSetApplicationSettings';

result := DllCall("DNSAPI\DnsSetApplicationSettings"
    , "UInt", cServers   ; DWORD
    , "Ptr", pServers   ; DNS_CUSTOM_SERVER*
    , "Ptr", pSettings   ; DNS_APPLICATION_SETTINGS* optional
    , "UInt")   ; return: DWORD

●DnsSetApplicationSettings(cServers, pServers, pSettings) = DLL("DNSAPI.dll", "dword DnsSetApplicationSettings(dword, void*, void*)")
# 呼び出し: DnsSetApplicationSettings(cServers, pServers, pSettings)
# cServers : DWORD -> "dword"
# pServers : DNS_CUSTOM_SERVER* -> "void*"
# pSettings : DNS_APPLICATION_SETTINGS* optional -> "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)。