SnmpUtilOctetsNCmp

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

INT SnmpUtilOctetsNCmp(
    AsnOctetString* pOctets1,
    AsnOctetString* pOctets2,
    DWORD nChars
);

<DllImport("snmpapi.dll", ExactSpelling:=True)>
Public Shared Function SnmpUtilOctetsNCmp(
    pOctets1 As IntPtr,   ' AsnOctetString* in/out
    pOctets2 As IntPtr,   ' AsnOctetString* in/out
    nChars As UInteger   ' DWORD
) As Integer
End Function

' pOctets1 : AsnOctetString* in/out
' pOctets2 : AsnOctetString* in/out
' nChars : DWORD
Declare PtrSafe Function SnmpUtilOctetsNCmp Lib "snmpapi" ( _
    ByVal pOctets1 As LongPtr, _
    ByVal pOctets2 As LongPtr, _
    ByVal nChars 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

SnmpUtilOctetsNCmp = ctypes.windll.snmpapi.SnmpUtilOctetsNCmp
SnmpUtilOctetsNCmp.restype = ctypes.c_int
SnmpUtilOctetsNCmp.argtypes = [
    ctypes.c_void_p,  # pOctets1 : AsnOctetString* in/out
    ctypes.c_void_p,  # pOctets2 : AsnOctetString* in/out
    wintypes.DWORD,  # nChars : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('snmpapi.dll')
SnmpUtilOctetsNCmp = Fiddle::Function.new(
  lib['SnmpUtilOctetsNCmp'],
  [
    Fiddle::TYPE_VOIDP,  # pOctets1 : AsnOctetString* in/out
    Fiddle::TYPE_VOIDP,  # pOctets2 : AsnOctetString* in/out
    -Fiddle::TYPE_INT,  # nChars : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "snmpapi")]
extern "system" {
    fn SnmpUtilOctetsNCmp(
        pOctets1: *mut AsnOctetString,  // AsnOctetString* in/out
        pOctets2: *mut AsnOctetString,  // AsnOctetString* in/out
        nChars: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("snmpapi.dll")]
public static extern int SnmpUtilOctetsNCmp(IntPtr pOctets1, IntPtr pOctets2, uint nChars);
"@
$api = Add-Type -MemberDefinition $sig -Name 'snmpapi_SnmpUtilOctetsNCmp' -Namespace Win32 -PassThru
# $api::SnmpUtilOctetsNCmp(pOctets1, pOctets2, nChars)

#uselib "snmpapi.dll"
#func global SnmpUtilOctetsNCmp "SnmpUtilOctetsNCmp" sptr, sptr, sptr
; SnmpUtilOctetsNCmp varptr(pOctets1), varptr(pOctets2), nChars   ; 戻り値は stat
; pOctets1 : AsnOctetString* in/out -> "sptr"
; pOctets2 : AsnOctetString* in/out -> "sptr"
; nChars : DWORD -> "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 "snmpapi.dll"
#cfunc global SnmpUtilOctetsNCmp "SnmpUtilOctetsNCmp" var, var, int
; res = SnmpUtilOctetsNCmp(pOctets1, pOctets2, nChars)
; pOctets1 : AsnOctetString* in/out -> "var"
; pOctets2 : AsnOctetString* in/out -> "var"
; nChars : DWORD -> "int"
; ※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。

; INT SnmpUtilOctetsNCmp(AsnOctetString* pOctets1, AsnOctetString* pOctets2, DWORD nChars)
#uselib "snmpapi.dll"
#cfunc global SnmpUtilOctetsNCmp "SnmpUtilOctetsNCmp" var, var, int
; res = SnmpUtilOctetsNCmp(pOctets1, pOctets2, nChars)
; pOctets1 : AsnOctetString* in/out -> "var"
; pOctets2 : AsnOctetString* in/out -> "var"
; nChars : DWORD -> "int"
; ※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 (
	snmpapi = windows.NewLazySystemDLL("snmpapi.dll")
	procSnmpUtilOctetsNCmp = snmpapi.NewProc("SnmpUtilOctetsNCmp")
)

// pOctets1 (AsnOctetString* in/out), pOctets2 (AsnOctetString* in/out), nChars (DWORD)
r1, _, err := procSnmpUtilOctetsNCmp.Call(
	uintptr(pOctets1),
	uintptr(pOctets2),
	uintptr(nChars),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function SnmpUtilOctetsNCmp(
  pOctets1: Pointer;   // AsnOctetString* in/out
  pOctets2: Pointer;   // AsnOctetString* in/out
  nChars: DWORD   // DWORD
): Integer; stdcall;
  external 'snmpapi.dll' name 'SnmpUtilOctetsNCmp';

result := DllCall("snmpapi\SnmpUtilOctetsNCmp"
    , "Ptr", pOctets1   ; AsnOctetString* in/out
    , "Ptr", pOctets2   ; AsnOctetString* in/out
    , "UInt", nChars   ; DWORD
    , "Int")   ; return: INT

●SnmpUtilOctetsNCmp(pOctets1, pOctets2, nChars) = DLL("snmpapi.dll", "int SnmpUtilOctetsNCmp(void*, void*, dword)")
# 呼び出し: SnmpUtilOctetsNCmp(pOctets1, pOctets2, nChars)
# pOctets1 : AsnOctetString* in/out -> "void*"
# pOctets2 : AsnOctetString* in/out -> "void*"
# nChars : DWORD -> "dword"
# 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)。