JetGetLogInfoInstanceW

// ESENT.dll  (Unicode / -W)
#include <windows.h>

INT JetGetLogInfoInstanceW(
    JET_INSTANCE instance,
    WORD* wszzLogs,   // optional
    DWORD cbMax,
    DWORD* pcbActual   // optional
);

<DllImport("ESENT.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function JetGetLogInfoInstanceW(
    instance As UIntPtr,   ' JET_INSTANCE
    wszzLogs As IntPtr,   ' WORD* optional, out
    cbMax As UInteger,   ' DWORD
    pcbActual As IntPtr   ' DWORD* optional, out
) As Integer
End Function

' instance : JET_INSTANCE
' wszzLogs : WORD* optional, out
' cbMax : DWORD
' pcbActual : DWORD* optional, out
Declare PtrSafe Function JetGetLogInfoInstanceW Lib "esent" ( _
    ByVal instance As LongPtr, _
    ByVal wszzLogs As LongPtr, _
    ByVal cbMax As Long, _
    ByVal pcbActual As LongPtr) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

JetGetLogInfoInstanceW = ctypes.windll.esent.JetGetLogInfoInstanceW
JetGetLogInfoInstanceW.restype = ctypes.c_int
JetGetLogInfoInstanceW.argtypes = [
    ctypes.c_size_t,  # instance : JET_INSTANCE
    ctypes.POINTER(ctypes.c_ushort),  # wszzLogs : WORD* optional, out
    wintypes.DWORD,  # cbMax : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbActual : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ESENT.dll')
JetGetLogInfoInstanceW = Fiddle::Function.new(
  lib['JetGetLogInfoInstanceW'],
  [
    Fiddle::TYPE_UINTPTR_T,  # instance : JET_INSTANCE
    Fiddle::TYPE_VOIDP,  # wszzLogs : WORD* optional, out
    -Fiddle::TYPE_INT,  # cbMax : DWORD
    Fiddle::TYPE_VOIDP,  # pcbActual : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "esent")]
extern "system" {
    fn JetGetLogInfoInstanceW(
        instance: usize,  // JET_INSTANCE
        wszzLogs: *mut u16,  // WORD* optional, out
        cbMax: u32,  // DWORD
        pcbActual: *mut u32  // DWORD* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ESENT.dll", CharSet = CharSet.Unicode)]
public static extern int JetGetLogInfoInstanceW(UIntPtr instance, IntPtr wszzLogs, uint cbMax, IntPtr pcbActual);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ESENT_JetGetLogInfoInstanceW' -Namespace Win32 -PassThru
# $api::JetGetLogInfoInstanceW(instance, wszzLogs, cbMax, pcbActual)

#uselib "ESENT.dll"
#func global JetGetLogInfoInstanceW "JetGetLogInfoInstanceW" wptr, wptr, wptr, wptr
; JetGetLogInfoInstanceW instance, varptr(wszzLogs), cbMax, varptr(pcbActual)   ; 戻り値は stat
; instance : JET_INSTANCE -> "wptr"
; wszzLogs : WORD* optional, out -> "wptr"
; cbMax : DWORD -> "wptr"
; pcbActual : DWORD* optional, out -> "wptr"
; ※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 "ESENT.dll"
#cfunc global JetGetLogInfoInstanceW "JetGetLogInfoInstanceW" sptr, var, int, var
; res = JetGetLogInfoInstanceW(instance, wszzLogs, cbMax, pcbActual)
; instance : JET_INSTANCE -> "sptr"
; wszzLogs : WORD* optional, out -> "var"
; cbMax : DWORD -> "int"
; pcbActual : DWORD* optional, 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。

; INT JetGetLogInfoInstanceW(JET_INSTANCE instance, WORD* wszzLogs, DWORD cbMax, DWORD* pcbActual)
#uselib "ESENT.dll"
#cfunc global JetGetLogInfoInstanceW "JetGetLogInfoInstanceW" intptr, var, int, var
; res = JetGetLogInfoInstanceW(instance, wszzLogs, cbMax, pcbActual)
; instance : JET_INSTANCE -> "intptr"
; wszzLogs : WORD* optional, out -> "var"
; cbMax : DWORD -> "int"
; pcbActual : DWORD* optional, 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 (
	esent = windows.NewLazySystemDLL("ESENT.dll")
	procJetGetLogInfoInstanceW = esent.NewProc("JetGetLogInfoInstanceW")
)

// instance (JET_INSTANCE), wszzLogs (WORD* optional, out), cbMax (DWORD), pcbActual (DWORD* optional, out)
r1, _, err := procJetGetLogInfoInstanceW.Call(
	uintptr(instance),
	uintptr(wszzLogs),
	uintptr(cbMax),
	uintptr(pcbActual),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function JetGetLogInfoInstanceW(
  instance: NativeUInt;   // JET_INSTANCE
  wszzLogs: Pointer;   // WORD* optional, out
  cbMax: DWORD;   // DWORD
  pcbActual: Pointer   // DWORD* optional, out
): Integer; stdcall;
  external 'ESENT.dll' name 'JetGetLogInfoInstanceW';

result := DllCall("ESENT\JetGetLogInfoInstanceW"
    , "UPtr", instance   ; JET_INSTANCE
    , "Ptr", wszzLogs   ; WORD* optional, out
    , "UInt", cbMax   ; DWORD
    , "Ptr", pcbActual   ; DWORD* optional, out
    , "Int")   ; return: INT

●JetGetLogInfoInstanceW(instance, wszzLogs, cbMax, pcbActual) = DLL("ESENT.dll", "int JetGetLogInfoInstanceW(int, void*, dword, void*)")
# 呼び出し: JetGetLogInfoInstanceW(instance, wszzLogs, cbMax, pcbActual)
# instance : JET_INSTANCE -> "int"
# wszzLogs : WORD* optional, out -> "void*"
# cbMax : DWORD -> "dword"
# pcbActual : DWORD* optional, 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。