JetReadFile

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

INT JetReadFile(
    JET_HANDLE hfFile,
    void* pv,
    DWORD cb,
    DWORD* pcbActual   // optional
);

<DllImport("ESENT.dll", ExactSpelling:=True)>
Public Shared Function JetReadFile(
    hfFile As UIntPtr,   ' JET_HANDLE
    pv As IntPtr,   ' void* out
    cb As UInteger,   ' DWORD
    pcbActual As IntPtr   ' DWORD* optional, out
) As Integer
End Function

' hfFile : JET_HANDLE
' pv : void* out
' cb : DWORD
' pcbActual : DWORD* optional, out
Declare PtrSafe Function JetReadFile Lib "esent" ( _
    ByVal hfFile As LongPtr, _
    ByVal pv As LongPtr, _
    ByVal cb As Long, _
    ByVal pcbActual As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

JetReadFile = ctypes.windll.esent.JetReadFile
JetReadFile.restype = ctypes.c_int
JetReadFile.argtypes = [
    ctypes.c_size_t,  # hfFile : JET_HANDLE
    ctypes.POINTER(None),  # pv : void* out
    wintypes.DWORD,  # cb : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbActual : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ESENT.dll')
JetReadFile = Fiddle::Function.new(
  lib['JetReadFile'],
  [
    Fiddle::TYPE_UINTPTR_T,  # hfFile : JET_HANDLE
    Fiddle::TYPE_VOIDP,  # pv : void* out
    -Fiddle::TYPE_INT,  # cb : DWORD
    Fiddle::TYPE_VOIDP,  # pcbActual : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "esent")]
extern "system" {
    fn JetReadFile(
        hfFile: usize,  // JET_HANDLE
        pv: *mut (),  // void* out
        cb: u32,  // DWORD
        pcbActual: *mut u32  // DWORD* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ESENT.dll")]
public static extern int JetReadFile(UIntPtr hfFile, IntPtr pv, uint cb, IntPtr pcbActual);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ESENT_JetReadFile' -Namespace Win32 -PassThru
# $api::JetReadFile(hfFile, pv, cb, pcbActual)

#uselib "ESENT.dll"
#func global JetReadFile "JetReadFile" sptr, sptr, sptr, sptr
; JetReadFile hfFile, pv, cb, varptr(pcbActual)   ; 戻り値は stat
; hfFile : JET_HANDLE -> "sptr"
; pv : void* out -> "sptr"
; cb : DWORD -> "sptr"
; pcbActual : DWORD* optional, 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。

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

var (
	esent = windows.NewLazySystemDLL("ESENT.dll")
	procJetReadFile = esent.NewProc("JetReadFile")
)

// hfFile (JET_HANDLE), pv (void* out), cb (DWORD), pcbActual (DWORD* optional, out)
r1, _, err := procJetReadFile.Call(
	uintptr(hfFile),
	uintptr(pv),
	uintptr(cb),
	uintptr(pcbActual),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function JetReadFile(
  hfFile: NativeUInt;   // JET_HANDLE
  pv: Pointer;   // void* out
  cb: DWORD;   // DWORD
  pcbActual: Pointer   // DWORD* optional, out
): Integer; stdcall;
  external 'ESENT.dll' name 'JetReadFile';

result := DllCall("ESENT\JetReadFile"
    , "UPtr", hfFile   ; JET_HANDLE
    , "Ptr", pv   ; void* out
    , "UInt", cb   ; DWORD
    , "Ptr", pcbActual   ; DWORD* optional, out
    , "Int")   ; return: INT

●JetReadFile(hfFile, pv, cb, pcbActual) = DLL("ESENT.dll", "int JetReadFile(int, void*, dword, void*)")
# 呼び出し: JetReadFile(hfFile, pv, cb, pcbActual)
# hfFile : JET_HANDLE -> "int"
# pv : void* out -> "void*"
# cb : 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)。

const std = @import("std");

extern "esent" fn JetReadFile(
    hfFile: usize, // JET_HANDLE
    pv: ?*anyopaque, // void* out
    cb: u32, // DWORD
    pcbActual: [*c]u32 // DWORD* optional, out
) callconv(std.os.windows.WINAPI) i32;

proc JetReadFile(
    hfFile: uint,  # JET_HANDLE
    pv: pointer,  # void* out
    cb: uint32,  # DWORD
    pcbActual: ptr uint32  # DWORD* optional, out
): int32 {.importc: "JetReadFile", stdcall, dynlib: "ESENT.dll".}

pragma(lib, "esent");
extern(Windows)
int JetReadFile(
    size_t hfFile,   // JET_HANDLE
    void* pv,   // void* out
    uint cb,   // DWORD
    uint* pcbActual   // DWORD* optional, out
);

ccall((:JetReadFile, "ESENT.dll"), stdcall, Int32,
      (Csize_t, Ptr{Cvoid}, UInt32, Ptr{UInt32}),
      hfFile, pv, cb, pcbActual)
# hfFile : JET_HANDLE -> Csize_t
# pv : void* out -> Ptr{Cvoid}
# cb : DWORD -> UInt32
# pcbActual : DWORD* optional, 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 JetReadFile(
    uintptr_t hfFile,
    void* pv,
    uint32_t cb,
    uint32_t* pcbActual);
]]
local esent = ffi.load("esent")
-- esent.JetReadFile(hfFile, pv, cb, pcbActual)
-- hfFile : JET_HANDLE
-- pv : void* out
-- cb : DWORD
-- pcbActual : DWORD* optional, 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('ESENT.dll');
const JetReadFile = lib.func('__stdcall', 'JetReadFile', 'int32_t', ['uintptr_t', 'void *', 'uint32_t', 'uint32_t *']);
// JetReadFile(hfFile, pv, cb, pcbActual)
// hfFile : JET_HANDLE -> 'uintptr_t'
// pv : void* out -> 'void *'
// cb : DWORD -> 'uint32_t'
// pcbActual : DWORD* optional, 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("ESENT.dll", {
  JetReadFile: { parameters: ["usize", "pointer", "u32", "pointer"], result: "i32" },
});
// lib.symbols.JetReadFile(hfFile, pv, cb, pcbActual)
// hfFile : JET_HANDLE -> "usize"
// pv : void* out -> "pointer"
// cb : DWORD -> "u32"
// pcbActual : DWORD* optional, 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 JetReadFile(
    size_t hfFile,
    void* pv,
    uint32_t cb,
    uint32_t* pcbActual);
C, "ESENT.dll");
// $ffi->JetReadFile(hfFile, pv, cb, pcbActual);
// hfFile : JET_HANDLE
// pv : void* out
// cb : DWORD
// pcbActual : DWORD* optional, 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 Esent extends StdCallLibrary {
    Esent INSTANCE = Native.load("esent", Esent.class);
    int JetReadFile(
        long hfFile,   // JET_HANDLE
        Pointer pv,   // void* out
        int cb,   // DWORD
        IntByReference pcbActual   // DWORD* optional, out
    );
}

@[Link("esent")]
lib LibESENT
  fun JetReadFile = JetReadFile(
    hfFile : LibC::SizeT,   # JET_HANDLE
    pv : Void*,   # void* out
    cb : UInt32,   # DWORD
    pcbActual : UInt32*   # DWORD* optional, 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 JetReadFileNative = Int32 Function(UintPtr, Pointer<Void>, Uint32, Pointer<Uint32>);
typedef JetReadFileDart = int Function(int, Pointer<Void>, int, Pointer<Uint32>);
final JetReadFile = DynamicLibrary.open('ESENT.dll')
    .lookupFunction<JetReadFileNative, JetReadFileDart>('JetReadFile');
// hfFile : JET_HANDLE -> UintPtr
// pv : void* out -> Pointer<Void>
// cb : DWORD -> Uint32
// pcbActual : DWORD* optional, out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function JetReadFile(
  hfFile: NativeUInt;   // JET_HANDLE
  pv: Pointer;   // void* out
  cb: DWORD;   // DWORD
  pcbActual: Pointer   // DWORD* optional, out
): Integer; stdcall;
  external 'ESENT.dll' name 'JetReadFile';

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

foreign import stdcall safe "JetReadFile"
  c_JetReadFile :: CUIntPtr -> Ptr () -> Word32 -> Ptr Word32 -> IO Int32
-- hfFile : JET_HANDLE -> CUIntPtr
-- pv : void* out -> Ptr ()
-- cb : DWORD -> Word32
-- pcbActual : DWORD* optional, 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 jetreadfile =
  foreign "JetReadFile"
    (size_t @-> (ptr void) @-> uint32_t @-> (ptr uint32_t) @-> returning int32_t)
(* hfFile : JET_HANDLE -> size_t *)
(* pv : void* out -> (ptr void) *)
(* cb : DWORD -> uint32_t *)
(* pcbActual : DWORD* optional, 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 esent (t "ESENT.dll"))
(cffi:use-foreign-library esent)

(cffi:defcfun ("JetReadFile" jet-read-file :convention :stdcall) :int32
  (hf-file :uint64)   ; JET_HANDLE
  (pv :pointer)   ; void* out
  (cb :uint32)   ; DWORD
  (pcb-actual :pointer))   ; DWORD* optional, out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $JetReadFile = Win32::API::More->new('ESENT',
    'int JetReadFile(WPARAM hfFile, LPVOID pv, DWORD cb, LPVOID pcbActual)');
# my $ret = $JetReadFile->Call($hfFile, $pv, $cb, $pcbActual);
# hfFile : JET_HANDLE -> WPARAM
# pv : void* out -> LPVOID
# cb : DWORD -> DWORD
# pcbActual : DWORD* optional, out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。