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SnmpMgrCtl

関数

SNMP管理セッションに対し制御コードを発行し操作する。

DLLmgmtapi.dll呼出規約winapiSetLastErrorあり対応OSWindows 2000 以降

シグネチャ

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

BOOL SnmpMgrCtl(
    void* session,
    DWORD dwCtlCode,
    void* lpvInBuffer,
    DWORD cbInBuffer,
    void* lpvOUTBuffer,
    DWORD cbOUTBuffer,
    DWORD* lpcbBytesReturned
);

パラメーター

名前	型	方向	説明
session	void*	inout	SnmpMgrOpenで取得したセッションハンドル。
dwCtlCode	DWORD	in	実行する制御操作を示すコントロールコード。
lpvInBuffer	void*	inout	入力データを格納したバッファ。不要ならNULL可。
cbInBuffer	DWORD	in	入力バッファのサイズ(バイト数)。
lpvOUTBuffer	void*	inout	出力データを受け取るバッファ。不要ならNULL可。
cbOUTBuffer	DWORD	in	出力バッファのサイズ(バイト数)。
lpcbBytesReturned	DWORD*	inout	出力バッファに書き込まれた実バイト数を受け取るDWORDポインタ。

戻り値の型: BOOL

各言語での呼び出し定義

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

BOOL SnmpMgrCtl(
    void* session,
    DWORD dwCtlCode,
    void* lpvInBuffer,
    DWORD cbInBuffer,
    void* lpvOUTBuffer,
    DWORD cbOUTBuffer,
    DWORD* lpcbBytesReturned
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("mgmtapi.dll", SetLastError = true, ExactSpelling = true)]
static extern bool SnmpMgrCtl(
    IntPtr session,   // void* in/out
    uint dwCtlCode,   // DWORD
    IntPtr lpvInBuffer,   // void* in/out
    uint cbInBuffer,   // DWORD
    IntPtr lpvOUTBuffer,   // void* in/out
    uint cbOUTBuffer,   // DWORD
    ref uint lpcbBytesReturned   // DWORD* in/out
);

<DllImport("mgmtapi.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SnmpMgrCtl(
    session As IntPtr,   ' void* in/out
    dwCtlCode As UInteger,   ' DWORD
    lpvInBuffer As IntPtr,   ' void* in/out
    cbInBuffer As UInteger,   ' DWORD
    lpvOUTBuffer As IntPtr,   ' void* in/out
    cbOUTBuffer As UInteger,   ' DWORD
    ByRef lpcbBytesReturned As UInteger   ' DWORD* in/out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' session : void* in/out
' dwCtlCode : DWORD
' lpvInBuffer : void* in/out
' cbInBuffer : DWORD
' lpvOUTBuffer : void* in/out
' cbOUTBuffer : DWORD
' lpcbBytesReturned : DWORD* in/out
Declare PtrSafe Function SnmpMgrCtl Lib "mgmtapi" ( _
    ByVal session As LongPtr, _
    ByVal dwCtlCode As Long, _
    ByVal lpvInBuffer As LongPtr, _
    ByVal cbInBuffer As Long, _
    ByVal lpvOUTBuffer As LongPtr, _
    ByVal cbOUTBuffer As Long, _
    ByRef lpcbBytesReturned 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

SnmpMgrCtl = ctypes.windll.mgmtapi.SnmpMgrCtl
SnmpMgrCtl.restype = wintypes.BOOL
SnmpMgrCtl.argtypes = [
    ctypes.POINTER(None),  # session : void* in/out
    wintypes.DWORD,  # dwCtlCode : DWORD
    ctypes.POINTER(None),  # lpvInBuffer : void* in/out
    wintypes.DWORD,  # cbInBuffer : DWORD
    ctypes.POINTER(None),  # lpvOUTBuffer : void* in/out
    wintypes.DWORD,  # cbOUTBuffer : DWORD
    ctypes.POINTER(wintypes.DWORD),  # lpcbBytesReturned : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('mgmtapi.dll')
SnmpMgrCtl = Fiddle::Function.new(
  lib['SnmpMgrCtl'],
  [
    Fiddle::TYPE_VOIDP,  # session : void* in/out
    -Fiddle::TYPE_INT,  # dwCtlCode : DWORD
    Fiddle::TYPE_VOIDP,  # lpvInBuffer : void* in/out
    -Fiddle::TYPE_INT,  # cbInBuffer : DWORD
    Fiddle::TYPE_VOIDP,  # lpvOUTBuffer : void* in/out
    -Fiddle::TYPE_INT,  # cbOUTBuffer : DWORD
    Fiddle::TYPE_VOIDP,  # lpcbBytesReturned : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mgmtapi")]
extern "system" {
    fn SnmpMgrCtl(
        session: *mut (),  // void* in/out
        dwCtlCode: u32,  // DWORD
        lpvInBuffer: *mut (),  // void* in/out
        cbInBuffer: u32,  // DWORD
        lpvOUTBuffer: *mut (),  // void* in/out
        cbOUTBuffer: u32,  // DWORD
        lpcbBytesReturned: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("mgmtapi.dll", SetLastError = true)]
public static extern bool SnmpMgrCtl(IntPtr session, uint dwCtlCode, IntPtr lpvInBuffer, uint cbInBuffer, IntPtr lpvOUTBuffer, uint cbOUTBuffer, ref uint lpcbBytesReturned);
"@
$api = Add-Type -MemberDefinition $sig -Name 'mgmtapi_SnmpMgrCtl' -Namespace Win32 -PassThru
# $api::SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned)

#uselib "mgmtapi.dll"
#func global SnmpMgrCtl "SnmpMgrCtl" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; SnmpMgrCtl session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, varptr(lpcbBytesReturned)   ; 戻り値は stat
; session : void* in/out -> "sptr"
; dwCtlCode : DWORD -> "sptr"
; lpvInBuffer : void* in/out -> "sptr"
; cbInBuffer : DWORD -> "sptr"
; lpvOUTBuffer : void* in/out -> "sptr"
; cbOUTBuffer : DWORD -> "sptr"
; lpcbBytesReturned : DWORD* in/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。

出力引数:

#uselib "mgmtapi.dll"
#cfunc global SnmpMgrCtl "SnmpMgrCtl" sptr, int, sptr, int, sptr, int, var
; res = SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned)
; session : void* in/out -> "sptr"
; dwCtlCode : DWORD -> "int"
; lpvInBuffer : void* in/out -> "sptr"
; cbInBuffer : DWORD -> "int"
; lpvOUTBuffer : void* in/out -> "sptr"
; cbOUTBuffer : DWORD -> "int"
; lpcbBytesReturned : DWORD* in/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。#uselib "mgmtapi.dll"
#cfunc global SnmpMgrCtl "SnmpMgrCtl" sptr, int, sptr, int, sptr, int, sptr
; res = SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, varptr(lpcbBytesReturned))
; session : void* in/out -> "sptr"
; dwCtlCode : DWORD -> "int"
; lpvInBuffer : void* in/out -> "sptr"
; cbInBuffer : DWORD -> "int"
; lpvOUTBuffer : void* in/out -> "sptr"
; cbOUTBuffer : DWORD -> "int"
; lpcbBytesReturned : DWORD* in/out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; BOOL SnmpMgrCtl(void* session, DWORD dwCtlCode, void* lpvInBuffer, DWORD cbInBuffer, void* lpvOUTBuffer, DWORD cbOUTBuffer, DWORD* lpcbBytesReturned)
#uselib "mgmtapi.dll"
#cfunc global SnmpMgrCtl "SnmpMgrCtl" intptr, int, intptr, int, intptr, int, var
; res = SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned)
; session : void* in/out -> "intptr"
; dwCtlCode : DWORD -> "int"
; lpvInBuffer : void* in/out -> "intptr"
; cbInBuffer : DWORD -> "int"
; lpvOUTBuffer : void* in/out -> "intptr"
; cbOUTBuffer : DWORD -> "int"
; lpcbBytesReturned : DWORD* in/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。; BOOL SnmpMgrCtl(void* session, DWORD dwCtlCode, void* lpvInBuffer, DWORD cbInBuffer, void* lpvOUTBuffer, DWORD cbOUTBuffer, DWORD* lpcbBytesReturned)
#uselib "mgmtapi.dll"
#cfunc global SnmpMgrCtl "SnmpMgrCtl" intptr, int, intptr, int, intptr, int, intptr
; res = SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, varptr(lpcbBytesReturned))
; session : void* in/out -> "intptr"
; dwCtlCode : DWORD -> "int"
; lpvInBuffer : void* in/out -> "intptr"
; cbInBuffer : DWORD -> "int"
; lpvOUTBuffer : void* in/out -> "intptr"
; cbOUTBuffer : DWORD -> "int"
; lpcbBytesReturned : DWORD* in/out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	mgmtapi = windows.NewLazySystemDLL("mgmtapi.dll")
	procSnmpMgrCtl = mgmtapi.NewProc("SnmpMgrCtl")
)

// session (void* in/out), dwCtlCode (DWORD), lpvInBuffer (void* in/out), cbInBuffer (DWORD), lpvOUTBuffer (void* in/out), cbOUTBuffer (DWORD), lpcbBytesReturned (DWORD* in/out)
r1, _, err := procSnmpMgrCtl.Call(
	uintptr(session),
	uintptr(dwCtlCode),
	uintptr(lpvInBuffer),
	uintptr(cbInBuffer),
	uintptr(lpvOUTBuffer),
	uintptr(cbOUTBuffer),
	uintptr(lpcbBytesReturned),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SnmpMgrCtl(
  session: Pointer;   // void* in/out
  dwCtlCode: DWORD;   // DWORD
  lpvInBuffer: Pointer;   // void* in/out
  cbInBuffer: DWORD;   // DWORD
  lpvOUTBuffer: Pointer;   // void* in/out
  cbOUTBuffer: DWORD;   // DWORD
  lpcbBytesReturned: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'mgmtapi.dll' name 'SnmpMgrCtl';

result := DllCall("mgmtapi\SnmpMgrCtl"
    , "Ptr", session   ; void* in/out
    , "UInt", dwCtlCode   ; DWORD
    , "Ptr", lpvInBuffer   ; void* in/out
    , "UInt", cbInBuffer   ; DWORD
    , "Ptr", lpvOUTBuffer   ; void* in/out
    , "UInt", cbOUTBuffer   ; DWORD
    , "Ptr", lpcbBytesReturned   ; DWORD* in/out
    , "Int")   ; return: BOOL

●SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned) = DLL("mgmtapi.dll", "bool SnmpMgrCtl(void*, dword, void*, dword, void*, dword, void*)")
# 呼び出し: SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned)
# session : void* in/out -> "void*"
# dwCtlCode : DWORD -> "dword"
# lpvInBuffer : void* in/out -> "void*"
# cbInBuffer : DWORD -> "dword"
# lpvOUTBuffer : void* in/out -> "void*"
# cbOUTBuffer : DWORD -> "dword"
# lpcbBytesReturned : DWORD* in/out -> "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)。

const std = @import("std");

extern "mgmtapi" fn SnmpMgrCtl(
    session: ?*anyopaque, // void* in/out
    dwCtlCode: u32, // DWORD
    lpvInBuffer: ?*anyopaque, // void* in/out
    cbInBuffer: u32, // DWORD
    lpvOUTBuffer: ?*anyopaque, // void* in/out
    cbOUTBuffer: u32, // DWORD
    lpcbBytesReturned: [*c]u32 // DWORD* in/out
) callconv(std.os.windows.WINAPI) i32;

proc SnmpMgrCtl(
    session: pointer,  # void* in/out
    dwCtlCode: uint32,  # DWORD
    lpvInBuffer: pointer,  # void* in/out
    cbInBuffer: uint32,  # DWORD
    lpvOUTBuffer: pointer,  # void* in/out
    cbOUTBuffer: uint32,  # DWORD
    lpcbBytesReturned: ptr uint32  # DWORD* in/out
): int32 {.importc: "SnmpMgrCtl", stdcall, dynlib: "mgmtapi.dll".}

pragma(lib, "mgmtapi");
extern(Windows)
int SnmpMgrCtl(
    void* session,   // void* in/out
    uint dwCtlCode,   // DWORD
    void* lpvInBuffer,   // void* in/out
    uint cbInBuffer,   // DWORD
    void* lpvOUTBuffer,   // void* in/out
    uint cbOUTBuffer,   // DWORD
    uint* lpcbBytesReturned   // DWORD* in/out
);

ccall((:SnmpMgrCtl, "mgmtapi.dll"), stdcall, Int32,
      (Ptr{Cvoid}, UInt32, Ptr{Cvoid}, UInt32, Ptr{Cvoid}, UInt32, Ptr{UInt32}),
      session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned)
# session : void* in/out -> Ptr{Cvoid}
# dwCtlCode : DWORD -> UInt32
# lpvInBuffer : void* in/out -> Ptr{Cvoid}
# cbInBuffer : DWORD -> UInt32
# lpvOUTBuffer : void* in/out -> Ptr{Cvoid}
# cbOUTBuffer : DWORD -> UInt32
# lpcbBytesReturned : DWORD* in/out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t SnmpMgrCtl(
    void* session,
    uint32_t dwCtlCode,
    void* lpvInBuffer,
    uint32_t cbInBuffer,
    void* lpvOUTBuffer,
    uint32_t cbOUTBuffer,
    uint32_t* lpcbBytesReturned);
]]
local mgmtapi = ffi.load("mgmtapi")
-- mgmtapi.SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned)
-- session : void* in/out
-- dwCtlCode : DWORD
-- lpvInBuffer : void* in/out
-- cbInBuffer : DWORD
-- lpvOUTBuffer : void* in/out
-- cbOUTBuffer : DWORD
-- lpcbBytesReturned : DWORD* in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('mgmtapi.dll');
const SnmpMgrCtl = lib.func('__stdcall', 'SnmpMgrCtl', 'int32_t', ['void *', 'uint32_t', 'void *', 'uint32_t', 'void *', 'uint32_t', 'uint32_t *']);
// SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned)
// session : void* in/out -> 'void *'
// dwCtlCode : DWORD -> 'uint32_t'
// lpvInBuffer : void* in/out -> 'void *'
// cbInBuffer : DWORD -> 'uint32_t'
// lpvOUTBuffer : void* in/out -> 'void *'
// cbOUTBuffer : DWORD -> 'uint32_t'
// lpcbBytesReturned : DWORD* in/out -> 'uint32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("mgmtapi.dll", {
  SnmpMgrCtl: { parameters: ["pointer", "u32", "pointer", "u32", "pointer", "u32", "pointer"], result: "i32" },
});
// lib.symbols.SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned)
// session : void* in/out -> "pointer"
// dwCtlCode : DWORD -> "u32"
// lpvInBuffer : void* in/out -> "pointer"
// cbInBuffer : DWORD -> "u32"
// lpvOUTBuffer : void* in/out -> "pointer"
// cbOUTBuffer : DWORD -> "u32"
// lpcbBytesReturned : DWORD* in/out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t SnmpMgrCtl(
    void* session,
    uint32_t dwCtlCode,
    void* lpvInBuffer,
    uint32_t cbInBuffer,
    void* lpvOUTBuffer,
    uint32_t cbOUTBuffer,
    uint32_t* lpcbBytesReturned);
C, "mgmtapi.dll");
// $ffi->SnmpMgrCtl(session, dwCtlCode, lpvInBuffer, cbInBuffer, lpvOUTBuffer, cbOUTBuffer, lpcbBytesReturned);
// session : void* in/out
// dwCtlCode : DWORD
// lpvInBuffer : void* in/out
// cbInBuffer : DWORD
// lpvOUTBuffer : void* in/out
// cbOUTBuffer : DWORD
// lpcbBytesReturned : DWORD* in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Mgmtapi extends StdCallLibrary {
    Mgmtapi INSTANCE = Native.load("mgmtapi", Mgmtapi.class);
    boolean SnmpMgrCtl(
        Pointer session,   // void* in/out
        int dwCtlCode,   // DWORD
        Pointer lpvInBuffer,   // void* in/out
        int cbInBuffer,   // DWORD
        Pointer lpvOUTBuffer,   // void* in/out
        int cbOUTBuffer,   // DWORD
        IntByReference lpcbBytesReturned   // DWORD* in/out
    );
}

@[Link("mgmtapi")]
lib Libmgmtapi
  fun SnmpMgrCtl = SnmpMgrCtl(
    session : Void*,   # void* in/out
    dwCtlCode : UInt32,   # DWORD
    lpvInBuffer : Void*,   # void* in/out
    cbInBuffer : UInt32,   # DWORD
    lpvOUTBuffer : Void*,   # void* in/out
    cbOUTBuffer : UInt32,   # DWORD
    lpcbBytesReturned : UInt32*   # DWORD* in/out
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef SnmpMgrCtlNative = Int32 Function(Pointer<Void>, Uint32, Pointer<Void>, Uint32, Pointer<Void>, Uint32, Pointer<Uint32>);
typedef SnmpMgrCtlDart = int Function(Pointer<Void>, int, Pointer<Void>, int, Pointer<Void>, int, Pointer<Uint32>);
final SnmpMgrCtl = DynamicLibrary.open('mgmtapi.dll')
    .lookupFunction<SnmpMgrCtlNative, SnmpMgrCtlDart>('SnmpMgrCtl');
// session : void* in/out -> Pointer<Void>
// dwCtlCode : DWORD -> Uint32
// lpvInBuffer : void* in/out -> Pointer<Void>
// cbInBuffer : DWORD -> Uint32
// lpvOUTBuffer : void* in/out -> Pointer<Void>
// cbOUTBuffer : DWORD -> Uint32
// lpcbBytesReturned : DWORD* in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SnmpMgrCtl(
  session: Pointer;   // void* in/out
  dwCtlCode: DWORD;   // DWORD
  lpvInBuffer: Pointer;   // void* in/out
  cbInBuffer: DWORD;   // DWORD
  lpvOUTBuffer: Pointer;   // void* in/out
  cbOUTBuffer: DWORD;   // DWORD
  lpcbBytesReturned: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'mgmtapi.dll' name 'SnmpMgrCtl';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "SnmpMgrCtl"
  c_SnmpMgrCtl :: Ptr () -> Word32 -> Ptr () -> Word32 -> Ptr () -> Word32 -> Ptr Word32 -> IO CInt
-- session : void* in/out -> Ptr ()
-- dwCtlCode : DWORD -> Word32
-- lpvInBuffer : void* in/out -> Ptr ()
-- cbInBuffer : DWORD -> Word32
-- lpvOUTBuffer : void* in/out -> Ptr ()
-- cbOUTBuffer : DWORD -> Word32
-- lpcbBytesReturned : DWORD* in/out -> Ptr Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let snmpmgrctl =
  foreign "SnmpMgrCtl"
    ((ptr void) @-> uint32_t @-> (ptr void) @-> uint32_t @-> (ptr void) @-> uint32_t @-> (ptr uint32_t) @-> returning int32_t)
(* session : void* in/out -> (ptr void) *)
(* dwCtlCode : DWORD -> uint32_t *)
(* lpvInBuffer : void* in/out -> (ptr void) *)
(* cbInBuffer : DWORD -> uint32_t *)
(* lpvOUTBuffer : void* in/out -> (ptr void) *)
(* cbOUTBuffer : DWORD -> uint32_t *)
(* lpcbBytesReturned : DWORD* in/out -> (ptr uint32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library mgmtapi (t "mgmtapi.dll"))
(cffi:use-foreign-library mgmtapi)

(cffi:defcfun ("SnmpMgrCtl" snmp-mgr-ctl :convention :stdcall) :int32
  (session :pointer)   ; void* in/out
  (dw-ctl-code :uint32)   ; DWORD
  (lpv-in-buffer :pointer)   ; void* in/out
  (cb-in-buffer :uint32)   ; DWORD
  (lpv-outbuffer :pointer)   ; void* in/out
  (cb-outbuffer :uint32)   ; DWORD
  (lpcb-bytes-returned :pointer))   ; DWORD* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SnmpMgrCtl = Win32::API::More->new('mgmtapi',
    'BOOL SnmpMgrCtl(LPVOID session, DWORD dwCtlCode, LPVOID lpvInBuffer, DWORD cbInBuffer, LPVOID lpvOUTBuffer, DWORD cbOUTBuffer, LPVOID lpcbBytesReturned)');
# my $ret = $SnmpMgrCtl->Call($session, $dwCtlCode, $lpvInBuffer, $cbInBuffer, $lpvOUTBuffer, $cbOUTBuffer, $lpcbBytesReturned);
# session : void* in/out -> LPVOID
# dwCtlCode : DWORD -> DWORD
# lpvInBuffer : void* in/out -> LPVOID
# cbInBuffer : DWORD -> DWORD
# lpvOUTBuffer : void* in/out -> LPVOID
# cbOUTBuffer : DWORD -> DWORD
# lpcbBytesReturned : DWORD* in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。