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NetErrorLogRead

関数
サーバーのエラーログから記録されたエントリを読み取る。
DLLNETAPI32.dll呼出規約winapi
📘 Microsoft Learn (日本語) · English

シグネチャ

// NETAPI32.dll
#include <windows.h>

DWORD NetErrorLogRead(
    LPCWSTR UncServerName,   // optional
    LPWSTR Reserved1,   // optional
    HLOG* ErrorLogHandle,
    DWORD Offset,
    DWORD* Reserved2,   // optional
    DWORD Reserved3,
    DWORD OffsetFlag,
    BYTE** BufPtr,
    DWORD PrefMaxSize,
    DWORD* BytesRead,
    DWORD* TotalAvailable
);

パラメーター

名前型方向説明
UncServerNameLPCWSTRinoptionalTBD
Reserved1LPWSTRinoptionalTBD
ErrorLogHandleHLOG*inTBD
OffsetDWORDinTBD
Reserved2DWORD*inoptionalTBD
Reserved3DWORDinTBD
OffsetFlagDWORDinTBD
BufPtrBYTE**outTBD
PrefMaxSizeDWORDinTBD
BytesReadDWORD*outTBD
TotalAvailableDWORD*outTBD

戻り値の型: DWORD

公式ドキュメント

NetErrorLogRead 関数は廃止されています。16 ビット版の Windows との互換性のために含まれています。その他のアプリケーションではイベントログを使用してください。

出典・ライセンス: 上記「公式ドキュメント」の内容は Microsoft の Win32 API ドキュメント(MicrosoftDocs/sdk-api)を日本語に翻訳・改変したものです。© Microsoft Corporation. CC BY 4.0 で提供。
Microsoft 公式リファレンス: 英語 (en-us) · 日本語 (ja-jp) · 原文ソース (GitHub)

各言語での呼び出し定義

// NETAPI32.dll
#include <windows.h>

DWORD NetErrorLogRead(
    LPCWSTR UncServerName,   // optional
    LPWSTR Reserved1,   // optional
    HLOG* ErrorLogHandle,
    DWORD Offset,
    DWORD* Reserved2,   // optional
    DWORD Reserved3,
    DWORD OffsetFlag,
    BYTE** BufPtr,
    DWORD PrefMaxSize,
    DWORD* BytesRead,
    DWORD* TotalAvailable
);
[DllImport("NETAPI32.dll", ExactSpelling = true)]
static extern uint NetErrorLogRead(
    [MarshalAs(UnmanagedType.LPWStr)] string UncServerName,   // LPCWSTR optional
    [MarshalAs(UnmanagedType.LPWStr)] string Reserved1,   // LPWSTR optional
    IntPtr ErrorLogHandle,   // HLOG*
    uint Offset,   // DWORD
    IntPtr Reserved2,   // DWORD* optional
    uint Reserved3,   // DWORD
    uint OffsetFlag,   // DWORD
    IntPtr BufPtr,   // BYTE** out
    uint PrefMaxSize,   // DWORD
    out uint BytesRead,   // DWORD* out
    out uint TotalAvailable   // DWORD* out
);
<DllImport("NETAPI32.dll", ExactSpelling:=True)>
Public Shared Function NetErrorLogRead(
    <MarshalAs(UnmanagedType.LPWStr)> UncServerName As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> Reserved1 As String,   ' LPWSTR optional
    ErrorLogHandle As IntPtr,   ' HLOG*
    Offset As UInteger,   ' DWORD
    Reserved2 As IntPtr,   ' DWORD* optional
    Reserved3 As UInteger,   ' DWORD
    OffsetFlag As UInteger,   ' DWORD
    BufPtr As IntPtr,   ' BYTE** out
    PrefMaxSize As UInteger,   ' DWORD
    <Out> ByRef BytesRead As UInteger,   ' DWORD* out
    <Out> ByRef TotalAvailable As UInteger   ' DWORD* out
) As UInteger
End Function
' UncServerName : LPCWSTR optional
' Reserved1 : LPWSTR optional
' ErrorLogHandle : HLOG*
' Offset : DWORD
' Reserved2 : DWORD* optional
' Reserved3 : DWORD
' OffsetFlag : DWORD
' BufPtr : BYTE** out
' PrefMaxSize : DWORD
' BytesRead : DWORD* out
' TotalAvailable : DWORD* out
Declare PtrSafe Function NetErrorLogRead Lib "netapi32" ( _
    ByVal UncServerName As LongPtr, _
    ByVal Reserved1 As LongPtr, _
    ByVal ErrorLogHandle As LongPtr, _
    ByVal Offset As Long, _
    ByVal Reserved2 As LongPtr, _
    ByVal Reserved3 As Long, _
    ByVal OffsetFlag As Long, _
    ByVal BufPtr As LongPtr, _
    ByVal PrefMaxSize As Long, _
    ByRef BytesRead As Long, _
    ByRef TotalAvailable 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

NetErrorLogRead = ctypes.windll.netapi32.NetErrorLogRead
NetErrorLogRead.restype = wintypes.DWORD
NetErrorLogRead.argtypes = [
    wintypes.LPCWSTR,  # UncServerName : LPCWSTR optional
    wintypes.LPCWSTR,  # Reserved1 : LPWSTR optional
    ctypes.c_void_p,  # ErrorLogHandle : HLOG*
    wintypes.DWORD,  # Offset : DWORD
    ctypes.POINTER(wintypes.DWORD),  # Reserved2 : DWORD* optional
    wintypes.DWORD,  # Reserved3 : DWORD
    wintypes.DWORD,  # OffsetFlag : DWORD
    ctypes.c_void_p,  # BufPtr : BYTE** out
    wintypes.DWORD,  # PrefMaxSize : DWORD
    ctypes.POINTER(wintypes.DWORD),  # BytesRead : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # TotalAvailable : DWORD* out
]
require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('NETAPI32.dll')
NetErrorLogRead = Fiddle::Function.new(
  lib['NetErrorLogRead'],
  [
    Fiddle::TYPE_VOIDP,  # UncServerName : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # Reserved1 : LPWSTR optional
    Fiddle::TYPE_VOIDP,  # ErrorLogHandle : HLOG*
    -Fiddle::TYPE_INT,  # Offset : DWORD
    Fiddle::TYPE_VOIDP,  # Reserved2 : DWORD* optional
    -Fiddle::TYPE_INT,  # Reserved3 : DWORD
    -Fiddle::TYPE_INT,  # OffsetFlag : DWORD
    Fiddle::TYPE_VOIDP,  # BufPtr : BYTE** out
    -Fiddle::TYPE_INT,  # PrefMaxSize : DWORD
    Fiddle::TYPE_VOIDP,  # BytesRead : DWORD* out
    Fiddle::TYPE_VOIDP,  # TotalAvailable : DWORD* out
  ],
  -Fiddle::TYPE_INT)
#[link(name = "netapi32")]
extern "system" {
    fn NetErrorLogRead(
        UncServerName: *const u16,  // LPCWSTR optional
        Reserved1: *mut u16,  // LPWSTR optional
        ErrorLogHandle: *mut HLOG,  // HLOG*
        Offset: u32,  // DWORD
        Reserved2: *mut u32,  // DWORD* optional
        Reserved3: u32,  // DWORD
        OffsetFlag: u32,  // DWORD
        BufPtr: *mut *mut u8,  // BYTE** out
        PrefMaxSize: u32,  // DWORD
        BytesRead: *mut u32,  // DWORD* out
        TotalAvailable: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.
$sig = @"
[DllImport("NETAPI32.dll")]
public static extern uint NetErrorLogRead([MarshalAs(UnmanagedType.LPWStr)] string UncServerName, [MarshalAs(UnmanagedType.LPWStr)] string Reserved1, IntPtr ErrorLogHandle, uint Offset, IntPtr Reserved2, uint Reserved3, uint OffsetFlag, IntPtr BufPtr, uint PrefMaxSize, out uint BytesRead, out uint TotalAvailable);
"@
$api = Add-Type -MemberDefinition $sig -Name 'NETAPI32_NetErrorLogRead' -Namespace Win32 -PassThru
# $api::NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable)
#uselib "NETAPI32.dll"
#func global NetErrorLogRead "NetErrorLogRead" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; NetErrorLogRead UncServerName, Reserved1, varptr(ErrorLogHandle), Offset, varptr(Reserved2), Reserved3, OffsetFlag, varptr(BufPtr), PrefMaxSize, varptr(BytesRead), varptr(TotalAvailable)   ; 戻り値は stat
; UncServerName : LPCWSTR optional -> "sptr"
; Reserved1 : LPWSTR optional -> "sptr"
; ErrorLogHandle : HLOG* -> "sptr"
; Offset : DWORD -> "sptr"
; Reserved2 : DWORD* optional -> "sptr"
; Reserved3 : DWORD -> "sptr"
; OffsetFlag : DWORD -> "sptr"
; BufPtr : BYTE** out -> "sptr"
; PrefMaxSize : DWORD -> "sptr"
; BytesRead : DWORD* out -> "sptr"
; TotalAvailable : DWORD* 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 "NETAPI32.dll"
#cfunc global NetErrorLogRead "NetErrorLogRead" wstr, wstr, var, int, var, int, int, var, int, var, var
; res = NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable)
; UncServerName : LPCWSTR optional -> "wstr"
; Reserved1 : LPWSTR optional -> "wstr"
; ErrorLogHandle : HLOG* -> "var"
; Offset : DWORD -> "int"
; Reserved2 : DWORD* optional -> "var"
; Reserved3 : DWORD -> "int"
; OffsetFlag : DWORD -> "int"
; BufPtr : BYTE** out -> "var"
; PrefMaxSize : DWORD -> "int"
; BytesRead : DWORD* out -> "var"
; TotalAvailable : DWORD* 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。
出力引数: 
; DWORD NetErrorLogRead(LPCWSTR UncServerName, LPWSTR Reserved1, HLOG* ErrorLogHandle, DWORD Offset, DWORD* Reserved2, DWORD Reserved3, DWORD OffsetFlag, BYTE** BufPtr, DWORD PrefMaxSize, DWORD* BytesRead, DWORD* TotalAvailable)
#uselib "NETAPI32.dll"
#cfunc global NetErrorLogRead "NetErrorLogRead" wstr, wstr, var, int, var, int, int, var, int, var, var
; res = NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable)
; UncServerName : LPCWSTR optional -> "wstr"
; Reserved1 : LPWSTR optional -> "wstr"
; ErrorLogHandle : HLOG* -> "var"
; Offset : DWORD -> "int"
; Reserved2 : DWORD* optional -> "var"
; Reserved3 : DWORD -> "int"
; OffsetFlag : DWORD -> "int"
; BufPtr : BYTE** out -> "var"
; PrefMaxSize : DWORD -> "int"
; BytesRead : DWORD* out -> "var"
; TotalAvailable : DWORD* 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。
import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	netapi32 = windows.NewLazySystemDLL("NETAPI32.dll")
	procNetErrorLogRead = netapi32.NewProc("NetErrorLogRead")
)

// UncServerName (LPCWSTR optional), Reserved1 (LPWSTR optional), ErrorLogHandle (HLOG*), Offset (DWORD), Reserved2 (DWORD* optional), Reserved3 (DWORD), OffsetFlag (DWORD), BufPtr (BYTE** out), PrefMaxSize (DWORD), BytesRead (DWORD* out), TotalAvailable (DWORD* out)
r1, _, err := procNetErrorLogRead.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(UncServerName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(Reserved1))),
	uintptr(ErrorLogHandle),
	uintptr(Offset),
	uintptr(Reserved2),
	uintptr(Reserved3),
	uintptr(OffsetFlag),
	uintptr(BufPtr),
	uintptr(PrefMaxSize),
	uintptr(BytesRead),
	uintptr(TotalAvailable),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD
function NetErrorLogRead(
  UncServerName: PWideChar;   // LPCWSTR optional
  Reserved1: PWideChar;   // LPWSTR optional
  ErrorLogHandle: Pointer;   // HLOG*
  Offset: DWORD;   // DWORD
  Reserved2: Pointer;   // DWORD* optional
  Reserved3: DWORD;   // DWORD
  OffsetFlag: DWORD;   // DWORD
  BufPtr: Pointer;   // BYTE** out
  PrefMaxSize: DWORD;   // DWORD
  BytesRead: Pointer;   // DWORD* out
  TotalAvailable: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'NETAPI32.dll' name 'NetErrorLogRead';
result := DllCall("NETAPI32\NetErrorLogRead"
    , "WStr", UncServerName   ; LPCWSTR optional
    , "WStr", Reserved1   ; LPWSTR optional
    , "Ptr", ErrorLogHandle   ; HLOG*
    , "UInt", Offset   ; DWORD
    , "Ptr", Reserved2   ; DWORD* optional
    , "UInt", Reserved3   ; DWORD
    , "UInt", OffsetFlag   ; DWORD
    , "Ptr", BufPtr   ; BYTE** out
    , "UInt", PrefMaxSize   ; DWORD
    , "Ptr", BytesRead   ; DWORD* out
    , "Ptr", TotalAvailable   ; DWORD* out
    , "UInt")   ; return: DWORD
●NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable) = DLL("NETAPI32.dll", "dword NetErrorLogRead(char*, char*, void*, dword, void*, dword, dword, void*, dword, void*, void*)")
# 呼び出し: NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable)
# UncServerName : LPCWSTR optional -> "char*"
# Reserved1 : LPWSTR optional -> "char*"
# ErrorLogHandle : HLOG* -> "void*"
# Offset : DWORD -> "dword"
# Reserved2 : DWORD* optional -> "void*"
# Reserved3 : DWORD -> "dword"
# OffsetFlag : DWORD -> "dword"
# BufPtr : BYTE** out -> "void*"
# PrefMaxSize : DWORD -> "dword"
# BytesRead : DWORD* out -> "void*"
# TotalAvailable : DWORD* 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 "netapi32" fn NetErrorLogRead(
    UncServerName: [*c]const u16, // LPCWSTR optional
    Reserved1: [*c]const u16, // LPWSTR optional
    ErrorLogHandle: [*c]HLOG, // HLOG*
    Offset: u32, // DWORD
    Reserved2: [*c]u32, // DWORD* optional
    Reserved3: u32, // DWORD
    OffsetFlag: u32, // DWORD
    BufPtr: [*c][*c]u8, // BYTE** out
    PrefMaxSize: u32, // DWORD
    BytesRead: [*c]u32, // DWORD* out
    TotalAvailable: [*c]u32 // DWORD* out
) callconv(std.os.windows.WINAPI) u32;
proc NetErrorLogRead(
    UncServerName: WideCString,  # LPCWSTR optional
    Reserved1: WideCString,  # LPWSTR optional
    ErrorLogHandle: ptr HLOG,  # HLOG*
    Offset: uint32,  # DWORD
    Reserved2: ptr uint32,  # DWORD* optional
    Reserved3: uint32,  # DWORD
    OffsetFlag: uint32,  # DWORD
    BufPtr: ptr uint8,  # BYTE** out
    PrefMaxSize: uint32,  # DWORD
    BytesRead: ptr uint32,  # DWORD* out
    TotalAvailable: ptr uint32  # DWORD* out
): uint32 {.importc: "NetErrorLogRead", stdcall, dynlib: "NETAPI32.dll".}
pragma(lib, "netapi32");
extern(Windows)
uint NetErrorLogRead(
    const(wchar)* UncServerName,   // LPCWSTR optional
    const(wchar)* Reserved1,   // LPWSTR optional
    HLOG* ErrorLogHandle,   // HLOG*
    uint Offset,   // DWORD
    uint* Reserved2,   // DWORD* optional
    uint Reserved3,   // DWORD
    uint OffsetFlag,   // DWORD
    ubyte** BufPtr,   // BYTE** out
    uint PrefMaxSize,   // DWORD
    uint* BytesRead,   // DWORD* out
    uint* TotalAvailable   // DWORD* out
);
ccall((:NetErrorLogRead, "NETAPI32.dll"), stdcall, UInt32,
      (Cwstring, Cwstring, Ptr{HLOG}, UInt32, Ptr{UInt32}, UInt32, UInt32, Ptr{UInt8}, UInt32, Ptr{UInt32}, Ptr{UInt32}),
      UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable)
# UncServerName : LPCWSTR optional -> Cwstring
# Reserved1 : LPWSTR optional -> Cwstring
# ErrorLogHandle : HLOG* -> Ptr{HLOG}
# Offset : DWORD -> UInt32
# Reserved2 : DWORD* optional -> Ptr{UInt32}
# Reserved3 : DWORD -> UInt32
# OffsetFlag : DWORD -> UInt32
# BufPtr : BYTE** out -> Ptr{UInt8}
# PrefMaxSize : DWORD -> UInt32
# BytesRead : DWORD* out -> Ptr{UInt32}
# TotalAvailable : DWORD* out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
local ffi = require("ffi")
ffi.cdef[[
uint32_t NetErrorLogRead(
    const uint16_t* UncServerName,
    const uint16_t* Reserved1,
    void* ErrorLogHandle,
    uint32_t Offset,
    uint32_t* Reserved2,
    uint32_t Reserved3,
    uint32_t OffsetFlag,
    uint8_t** BufPtr,
    uint32_t PrefMaxSize,
    uint32_t* BytesRead,
    uint32_t* TotalAvailable);
]]
local netapi32 = ffi.load("netapi32")
-- netapi32.NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable)
-- UncServerName : LPCWSTR optional
-- Reserved1 : LPWSTR optional
-- ErrorLogHandle : HLOG*
-- Offset : DWORD
-- Reserved2 : DWORD* optional
-- Reserved3 : DWORD
-- OffsetFlag : DWORD
-- BufPtr : BYTE** out
-- PrefMaxSize : DWORD
-- BytesRead : DWORD* out
-- TotalAvailable : DWORD* 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('NETAPI32.dll');
const NetErrorLogRead = lib.func('__stdcall', 'NetErrorLogRead', 'uint32_t', ['str16', 'str16', 'void *', 'uint32_t', 'uint32_t *', 'uint32_t', 'uint32_t', 'uint8_t *', 'uint32_t', 'uint32_t *', 'uint32_t *']);
// NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable)
// UncServerName : LPCWSTR optional -> 'str16'
// Reserved1 : LPWSTR optional -> 'str16'
// ErrorLogHandle : HLOG* -> 'void *'
// Offset : DWORD -> 'uint32_t'
// Reserved2 : DWORD* optional -> 'uint32_t *'
// Reserved3 : DWORD -> 'uint32_t'
// OffsetFlag : DWORD -> 'uint32_t'
// BufPtr : BYTE** out -> 'uint8_t *'
// PrefMaxSize : DWORD -> 'uint32_t'
// BytesRead : DWORD* out -> 'uint32_t *'
// TotalAvailable : DWORD* 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("NETAPI32.dll", {
  NetErrorLogRead: { parameters: ["buffer", "buffer", "pointer", "u32", "pointer", "u32", "u32", "pointer", "u32", "pointer", "pointer"], result: "u32" },
});
// lib.symbols.NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable)
// UncServerName : LPCWSTR optional -> "buffer"
// Reserved1 : LPWSTR optional -> "buffer"
// ErrorLogHandle : HLOG* -> "pointer"
// Offset : DWORD -> "u32"
// Reserved2 : DWORD* optional -> "pointer"
// Reserved3 : DWORD -> "u32"
// OffsetFlag : DWORD -> "u32"
// BufPtr : BYTE** out -> "pointer"
// PrefMaxSize : DWORD -> "u32"
// BytesRead : DWORD* out -> "pointer"
// TotalAvailable : DWORD* 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
uint32_t NetErrorLogRead(
    const uint16_t* UncServerName,
    const uint16_t* Reserved1,
    void* ErrorLogHandle,
    uint32_t Offset,
    uint32_t* Reserved2,
    uint32_t Reserved3,
    uint32_t OffsetFlag,
    uint8_t** BufPtr,
    uint32_t PrefMaxSize,
    uint32_t* BytesRead,
    uint32_t* TotalAvailable);
C, "NETAPI32.dll");
// $ffi->NetErrorLogRead(UncServerName, Reserved1, ErrorLogHandle, Offset, Reserved2, Reserved3, OffsetFlag, BufPtr, PrefMaxSize, BytesRead, TotalAvailable);
// UncServerName : LPCWSTR optional
// Reserved1 : LPWSTR optional
// ErrorLogHandle : HLOG*
// Offset : DWORD
// Reserved2 : DWORD* optional
// Reserved3 : DWORD
// OffsetFlag : DWORD
// BufPtr : BYTE** out
// PrefMaxSize : DWORD
// BytesRead : DWORD* out
// TotalAvailable : DWORD* 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 Netapi32 extends StdCallLibrary {
    Netapi32 INSTANCE = Native.load("netapi32", Netapi32.class);
    int NetErrorLogRead(
        WString UncServerName,   // LPCWSTR optional
        WString Reserved1,   // LPWSTR optional
        Pointer ErrorLogHandle,   // HLOG*
        int Offset,   // DWORD
        IntByReference Reserved2,   // DWORD* optional
        int Reserved3,   // DWORD
        int OffsetFlag,   // DWORD
        Pointer BufPtr,   // BYTE** out
        int PrefMaxSize,   // DWORD
        IntByReference BytesRead,   // DWORD* out
        IntByReference TotalAvailable   // DWORD* out
    );
}
@[Link("netapi32")]
lib LibNETAPI32
  fun NetErrorLogRead = NetErrorLogRead(
    UncServerName : UInt16*,   # LPCWSTR optional
    Reserved1 : UInt16*,   # LPWSTR optional
    ErrorLogHandle : HLOG*,   # HLOG*
    Offset : UInt32,   # DWORD
    Reserved2 : UInt32*,   # DWORD* optional
    Reserved3 : UInt32,   # DWORD
    OffsetFlag : UInt32,   # DWORD
    BufPtr : UInt8**,   # BYTE** out
    PrefMaxSize : UInt32,   # DWORD
    BytesRead : UInt32*,   # DWORD* out
    TotalAvailable : UInt32*   # DWORD* out
  ) : UInt32
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 NetErrorLogReadNative = Uint32 Function(Pointer<Utf16>, Pointer<Utf16>, Pointer<Void>, Uint32, Pointer<Uint32>, Uint32, Uint32, Pointer<Uint8>, Uint32, Pointer<Uint32>, Pointer<Uint32>);
typedef NetErrorLogReadDart = int Function(Pointer<Utf16>, Pointer<Utf16>, Pointer<Void>, int, Pointer<Uint32>, int, int, Pointer<Uint8>, int, Pointer<Uint32>, Pointer<Uint32>);
final NetErrorLogRead = DynamicLibrary.open('NETAPI32.dll')
    .lookupFunction<NetErrorLogReadNative, NetErrorLogReadDart>('NetErrorLogRead');
// UncServerName : LPCWSTR optional -> Pointer<Utf16>
// Reserved1 : LPWSTR optional -> Pointer<Utf16>
// ErrorLogHandle : HLOG* -> Pointer<Void>
// Offset : DWORD -> Uint32
// Reserved2 : DWORD* optional -> Pointer<Uint32>
// Reserved3 : DWORD -> Uint32
// OffsetFlag : DWORD -> Uint32
// BufPtr : BYTE** out -> Pointer<Uint8>
// PrefMaxSize : DWORD -> Uint32
// BytesRead : DWORD* out -> Pointer<Uint32>
// TotalAvailable : DWORD* out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。
{$mode objfpc}{$H+}
function NetErrorLogRead(
  UncServerName: PWideChar;   // LPCWSTR optional
  Reserved1: PWideChar;   // LPWSTR optional
  ErrorLogHandle: Pointer;   // HLOG*
  Offset: DWORD;   // DWORD
  Reserved2: Pointer;   // DWORD* optional
  Reserved3: DWORD;   // DWORD
  OffsetFlag: DWORD;   // DWORD
  BufPtr: Pointer;   // BYTE** out
  PrefMaxSize: DWORD;   // DWORD
  BytesRead: Pointer;   // DWORD* out
  TotalAvailable: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'NETAPI32.dll' name 'NetErrorLogRead';
import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "NetErrorLogRead"
  c_NetErrorLogRead :: CWString -> CWString -> Ptr () -> Word32 -> Ptr Word32 -> Word32 -> Word32 -> Ptr Word8 -> Word32 -> Ptr Word32 -> Ptr Word32 -> IO Word32
-- UncServerName : LPCWSTR optional -> CWString
-- Reserved1 : LPWSTR optional -> CWString
-- ErrorLogHandle : HLOG* -> Ptr ()
-- Offset : DWORD -> Word32
-- Reserved2 : DWORD* optional -> Ptr Word32
-- Reserved3 : DWORD -> Word32
-- OffsetFlag : DWORD -> Word32
-- BufPtr : BYTE** out -> Ptr Word8
-- PrefMaxSize : DWORD -> Word32
-- BytesRead : DWORD* out -> Ptr Word32
-- TotalAvailable : DWORD* 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 neterrorlogread =
  foreign "NetErrorLogRead"
    ((ptr uint16_t) @-> (ptr uint16_t) @-> (ptr void) @-> uint32_t @-> (ptr uint32_t) @-> uint32_t @-> uint32_t @-> (ptr uint8_t) @-> uint32_t @-> (ptr uint32_t) @-> (ptr uint32_t) @-> returning uint32_t)
(* UncServerName : LPCWSTR optional -> (ptr uint16_t) *)
(* Reserved1 : LPWSTR optional -> (ptr uint16_t) *)
(* ErrorLogHandle : HLOG* -> (ptr void) *)
(* Offset : DWORD -> uint32_t *)
(* Reserved2 : DWORD* optional -> (ptr uint32_t) *)
(* Reserved3 : DWORD -> uint32_t *)
(* OffsetFlag : DWORD -> uint32_t *)
(* BufPtr : BYTE** out -> (ptr uint8_t) *)
(* PrefMaxSize : DWORD -> uint32_t *)
(* BytesRead : DWORD* out -> (ptr uint32_t) *)
(* TotalAvailable : DWORD* 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 netapi32 (t "NETAPI32.dll"))
(cffi:use-foreign-library netapi32)

(cffi:defcfun ("NetErrorLogRead" net-error-log-read :convention :stdcall) :uint32
  (unc-server-name (:string :encoding :utf-16le))   ; LPCWSTR optional
  (reserved1 (:string :encoding :utf-16le))   ; LPWSTR optional
  (error-log-handle :pointer)   ; HLOG*
  (offset :uint32)   ; DWORD
  (reserved2 :pointer)   ; DWORD* optional
  (reserved3 :uint32)   ; DWORD
  (offset-flag :uint32)   ; DWORD
  (buf-ptr :pointer)   ; BYTE** out
  (pref-max-size :uint32)   ; DWORD
  (bytes-read :pointer)   ; DWORD* out
  (total-available :pointer))   ; DWORD* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。
use Win32::API;
my $NetErrorLogRead = Win32::API::More->new('NETAPI32',
    'DWORD NetErrorLogRead(LPCWSTR UncServerName, LPCWSTR Reserved1, LPVOID ErrorLogHandle, DWORD Offset, LPVOID Reserved2, DWORD Reserved3, DWORD OffsetFlag, LPVOID BufPtr, DWORD PrefMaxSize, LPVOID BytesRead, LPVOID TotalAvailable)');
# my $ret = $NetErrorLogRead->Call($UncServerName, $Reserved1, $ErrorLogHandle, $Offset, $Reserved2, $Reserved3, $OffsetFlag, $BufPtr, $PrefMaxSize, $BytesRead, $TotalAvailable);
# UncServerName : LPCWSTR optional -> LPCWSTR
# Reserved1 : LPWSTR optional -> LPCWSTR
# ErrorLogHandle : HLOG* -> LPVOID
# Offset : DWORD -> DWORD
# Reserved2 : DWORD* optional -> LPVOID
# Reserved3 : DWORD -> DWORD
# OffsetFlag : DWORD -> DWORD
# BufPtr : BYTE** out -> LPVOID
# PrefMaxSize : DWORD -> DWORD
# BytesRead : DWORD* out -> LPVOID
# TotalAvailable : DWORD* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。

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