JetOpenFileW

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

INT JetOpenFileW(
    WORD* szFileName,
    JET_HANDLE* phfFile,
    DWORD* pulFileSizeLow,
    DWORD* pulFileSizeHigh
);

<DllImport("ESENT.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function JetOpenFileW(
    ByRef szFileName As UShort,   ' WORD*
    <Out> ByRef phfFile As UIntPtr,   ' JET_HANDLE* out
    <Out> ByRef pulFileSizeLow As UInteger,   ' DWORD* out
    <Out> ByRef pulFileSizeHigh As UInteger   ' DWORD* out
) As Integer
End Function

' szFileName : WORD*
' phfFile : JET_HANDLE* out
' pulFileSizeLow : DWORD* out
' pulFileSizeHigh : DWORD* out
Declare PtrSafe Function JetOpenFileW Lib "esent" ( _
    ByRef szFileName As Integer, _
    ByRef phfFile As LongPtr, _
    ByRef pulFileSizeLow As Long, _
    ByRef pulFileSizeHigh As Long) 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

JetOpenFileW = ctypes.windll.esent.JetOpenFileW
JetOpenFileW.restype = ctypes.c_int
JetOpenFileW.argtypes = [
    ctypes.POINTER(ctypes.c_ushort),  # szFileName : WORD*
    ctypes.c_void_p,  # phfFile : JET_HANDLE* out
    ctypes.POINTER(wintypes.DWORD),  # pulFileSizeLow : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # pulFileSizeHigh : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ESENT.dll')
JetOpenFileW = Fiddle::Function.new(
  lib['JetOpenFileW'],
  [
    Fiddle::TYPE_VOIDP,  # szFileName : WORD*
    Fiddle::TYPE_VOIDP,  # phfFile : JET_HANDLE* out
    Fiddle::TYPE_VOIDP,  # pulFileSizeLow : DWORD* out
    Fiddle::TYPE_VOIDP,  # pulFileSizeHigh : DWORD* out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "esent")]
extern "system" {
    fn JetOpenFileW(
        szFileName: *mut u16,  // WORD*
        phfFile: *mut usize,  // JET_HANDLE* out
        pulFileSizeLow: *mut u32,  // DWORD* out
        pulFileSizeHigh: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ESENT.dll", CharSet = CharSet.Unicode)]
public static extern int JetOpenFileW(ref ushort szFileName, out UIntPtr phfFile, out uint pulFileSizeLow, out uint pulFileSizeHigh);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ESENT_JetOpenFileW' -Namespace Win32 -PassThru
# $api::JetOpenFileW(szFileName, phfFile, pulFileSizeLow, pulFileSizeHigh)

#uselib "ESENT.dll"
#func global JetOpenFileW "JetOpenFileW" wptr, wptr, wptr, wptr
; JetOpenFileW varptr(szFileName), phfFile, varptr(pulFileSizeLow), varptr(pulFileSizeHigh)   ; 戻り値は stat
; szFileName : WORD* -> "wptr"
; phfFile : JET_HANDLE* out -> "wptr"
; pulFileSizeLow : DWORD* out -> "wptr"
; pulFileSizeHigh : DWORD* 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 JetOpenFileW "JetOpenFileW" var, int, var, var
; res = JetOpenFileW(szFileName, phfFile, pulFileSizeLow, pulFileSizeHigh)
; szFileName : WORD* -> "var"
; phfFile : JET_HANDLE* out -> "int"
; pulFileSizeLow : DWORD* out -> "var"
; pulFileSizeHigh : 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。

; INT JetOpenFileW(WORD* szFileName, JET_HANDLE* phfFile, DWORD* pulFileSizeLow, DWORD* pulFileSizeHigh)
#uselib "ESENT.dll"
#cfunc global JetOpenFileW "JetOpenFileW" var, int, var, var
; res = JetOpenFileW(szFileName, phfFile, pulFileSizeLow, pulFileSizeHigh)
; szFileName : WORD* -> "var"
; phfFile : JET_HANDLE* out -> "int"
; pulFileSizeLow : DWORD* out -> "var"
; pulFileSizeHigh : 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 (
	esent = windows.NewLazySystemDLL("ESENT.dll")
	procJetOpenFileW = esent.NewProc("JetOpenFileW")
)

// szFileName (WORD*), phfFile (JET_HANDLE* out), pulFileSizeLow (DWORD* out), pulFileSizeHigh (DWORD* out)
r1, _, err := procJetOpenFileW.Call(
	uintptr(szFileName),
	uintptr(phfFile),
	uintptr(pulFileSizeLow),
	uintptr(pulFileSizeHigh),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function JetOpenFileW(
  szFileName: Pointer;   // WORD*
  phfFile: Pointer;   // JET_HANDLE* out
  pulFileSizeLow: Pointer;   // DWORD* out
  pulFileSizeHigh: Pointer   // DWORD* out
): Integer; stdcall;
  external 'ESENT.dll' name 'JetOpenFileW';

result := DllCall("ESENT\JetOpenFileW"
    , "Ptr", szFileName   ; WORD*
    , "Ptr", phfFile   ; JET_HANDLE* out
    , "Ptr", pulFileSizeLow   ; DWORD* out
    , "Ptr", pulFileSizeHigh   ; DWORD* out
    , "Int")   ; return: INT

●JetOpenFileW(szFileName, phfFile, pulFileSizeLow, pulFileSizeHigh) = DLL("ESENT.dll", "int JetOpenFileW(void*, void*, void*, void*)")
# 呼び出し: JetOpenFileW(szFileName, phfFile, pulFileSizeLow, pulFileSizeHigh)
# szFileName : WORD* -> "void*"
# phfFile : JET_HANDLE* out -> "void*"
# pulFileSizeLow : DWORD* out -> "void*"
# pulFileSizeHigh : 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。