DhcpDeleteClass

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

DWORD DhcpDeleteClass(
    LPWSTR ServerIpAddress,   // optional
    DWORD ReservedMustBeZero,
    LPWSTR ClassName
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpDeleteClass(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    ReservedMustBeZero As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> ClassName As String   ' LPWSTR
) As UInteger
End Function

' ServerIpAddress : LPWSTR optional
' ReservedMustBeZero : DWORD
' ClassName : LPWSTR
Declare PtrSafe Function DhcpDeleteClass Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal ReservedMustBeZero As Long, _
    ByVal ClassName 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

DhcpDeleteClass = ctypes.windll.dhcpsapi.DhcpDeleteClass
DhcpDeleteClass.restype = wintypes.DWORD
DhcpDeleteClass.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    wintypes.DWORD,  # ReservedMustBeZero : DWORD
    wintypes.LPCWSTR,  # ClassName : LPWSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpDeleteClass = Fiddle::Function.new(
  lib['DhcpDeleteClass'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    -Fiddle::TYPE_INT,  # ReservedMustBeZero : DWORD
    Fiddle::TYPE_VOIDP,  # ClassName : LPWSTR
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpDeleteClass(
        ServerIpAddress: *mut u16,  // LPWSTR optional
        ReservedMustBeZero: u32,  // DWORD
        ClassName: *mut u16  // LPWSTR
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpDeleteClass([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, uint ReservedMustBeZero, [MarshalAs(UnmanagedType.LPWStr)] string ClassName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpDeleteClass' -Namespace Win32 -PassThru
# $api::DhcpDeleteClass(ServerIpAddress, ReservedMustBeZero, ClassName)

#uselib "DHCPSAPI.dll"
#func global DhcpDeleteClass "DhcpDeleteClass" sptr, sptr, sptr
; DhcpDeleteClass ServerIpAddress, ReservedMustBeZero, ClassName   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; ReservedMustBeZero : DWORD -> "sptr"
; ClassName : LPWSTR -> "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 "DHCPSAPI.dll"
#cfunc global DhcpDeleteClass "DhcpDeleteClass" wstr, int, wstr
; res = DhcpDeleteClass(ServerIpAddress, ReservedMustBeZero, ClassName)
; ServerIpAddress : LPWSTR optional -> "wstr"
; ReservedMustBeZero : DWORD -> "int"
; ClassName : LPWSTR -> "wstr"

; DWORD DhcpDeleteClass(LPWSTR ServerIpAddress, DWORD ReservedMustBeZero, LPWSTR ClassName)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpDeleteClass "DhcpDeleteClass" wstr, int, wstr
; res = DhcpDeleteClass(ServerIpAddress, ReservedMustBeZero, ClassName)
; ServerIpAddress : LPWSTR optional -> "wstr"
; ReservedMustBeZero : DWORD -> "int"
; ClassName : LPWSTR -> "wstr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	dhcpsapi = windows.NewLazySystemDLL("DHCPSAPI.dll")
	procDhcpDeleteClass = dhcpsapi.NewProc("DhcpDeleteClass")
)

// ServerIpAddress (LPWSTR optional), ReservedMustBeZero (DWORD), ClassName (LPWSTR)
r1, _, err := procDhcpDeleteClass.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(ReservedMustBeZero),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ClassName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpDeleteClass(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  ReservedMustBeZero: DWORD;   // DWORD
  ClassName: PWideChar   // LPWSTR
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpDeleteClass';

result := DllCall("DHCPSAPI\DhcpDeleteClass"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "UInt", ReservedMustBeZero   ; DWORD
    , "WStr", ClassName   ; LPWSTR
    , "UInt")   ; return: DWORD

●DhcpDeleteClass(ServerIpAddress, ReservedMustBeZero, ClassName) = DLL("DHCPSAPI.dll", "dword DhcpDeleteClass(char*, dword, char*)")
# 呼び出し: DhcpDeleteClass(ServerIpAddress, ReservedMustBeZero, ClassName)
# ServerIpAddress : LPWSTR optional -> "char*"
# ReservedMustBeZero : DWORD -> "dword"
# ClassName : LPWSTR -> "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)。