JetEnableMultiInstanceW

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

INT JetEnableMultiInstanceW(
    JET_SETSYSPARAM_W* psetsysparam,   // optional
    DWORD csetsysparam,
    DWORD* pcsetsucceed   // optional
);

<DllImport("ESENT.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function JetEnableMultiInstanceW(
    psetsysparam As IntPtr,   ' JET_SETSYSPARAM_W* optional
    csetsysparam As UInteger,   ' DWORD
    pcsetsucceed As IntPtr   ' DWORD* optional, out
) As Integer
End Function

' psetsysparam : JET_SETSYSPARAM_W* optional
' csetsysparam : DWORD
' pcsetsucceed : DWORD* optional, out
Declare PtrSafe Function JetEnableMultiInstanceW Lib "esent" ( _
    ByVal psetsysparam As LongPtr, _
    ByVal csetsysparam As Long, _
    ByVal pcsetsucceed 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

JetEnableMultiInstanceW = ctypes.windll.esent.JetEnableMultiInstanceW
JetEnableMultiInstanceW.restype = ctypes.c_int
JetEnableMultiInstanceW.argtypes = [
    ctypes.c_void_p,  # psetsysparam : JET_SETSYSPARAM_W* optional
    wintypes.DWORD,  # csetsysparam : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcsetsucceed : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ESENT.dll')
JetEnableMultiInstanceW = Fiddle::Function.new(
  lib['JetEnableMultiInstanceW'],
  [
    Fiddle::TYPE_VOIDP,  # psetsysparam : JET_SETSYSPARAM_W* optional
    -Fiddle::TYPE_INT,  # csetsysparam : DWORD
    Fiddle::TYPE_VOIDP,  # pcsetsucceed : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "esent")]
extern "system" {
    fn JetEnableMultiInstanceW(
        psetsysparam: *mut JET_SETSYSPARAM_W,  // JET_SETSYSPARAM_W* optional
        csetsysparam: u32,  // DWORD
        pcsetsucceed: *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 JetEnableMultiInstanceW(IntPtr psetsysparam, uint csetsysparam, IntPtr pcsetsucceed);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ESENT_JetEnableMultiInstanceW' -Namespace Win32 -PassThru
# $api::JetEnableMultiInstanceW(psetsysparam, csetsysparam, pcsetsucceed)

#uselib "ESENT.dll"
#func global JetEnableMultiInstanceW "JetEnableMultiInstanceW" wptr, wptr, wptr
; JetEnableMultiInstanceW varptr(psetsysparam), csetsysparam, varptr(pcsetsucceed)   ; 戻り値は stat
; psetsysparam : JET_SETSYSPARAM_W* optional -> "wptr"
; csetsysparam : DWORD -> "wptr"
; pcsetsucceed : 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 JetEnableMultiInstanceW "JetEnableMultiInstanceW" var, int, var
; res = JetEnableMultiInstanceW(psetsysparam, csetsysparam, pcsetsucceed)
; psetsysparam : JET_SETSYSPARAM_W* optional -> "var"
; csetsysparam : DWORD -> "int"
; pcsetsucceed : 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 JetEnableMultiInstanceW(JET_SETSYSPARAM_W* psetsysparam, DWORD csetsysparam, DWORD* pcsetsucceed)
#uselib "ESENT.dll"
#cfunc global JetEnableMultiInstanceW "JetEnableMultiInstanceW" var, int, var
; res = JetEnableMultiInstanceW(psetsysparam, csetsysparam, pcsetsucceed)
; psetsysparam : JET_SETSYSPARAM_W* optional -> "var"
; csetsysparam : DWORD -> "int"
; pcsetsucceed : 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")
	procJetEnableMultiInstanceW = esent.NewProc("JetEnableMultiInstanceW")
)

// psetsysparam (JET_SETSYSPARAM_W* optional), csetsysparam (DWORD), pcsetsucceed (DWORD* optional, out)
r1, _, err := procJetEnableMultiInstanceW.Call(
	uintptr(psetsysparam),
	uintptr(csetsysparam),
	uintptr(pcsetsucceed),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function JetEnableMultiInstanceW(
  psetsysparam: Pointer;   // JET_SETSYSPARAM_W* optional
  csetsysparam: DWORD;   // DWORD
  pcsetsucceed: Pointer   // DWORD* optional, out
): Integer; stdcall;
  external 'ESENT.dll' name 'JetEnableMultiInstanceW';

result := DllCall("ESENT\JetEnableMultiInstanceW"
    , "Ptr", psetsysparam   ; JET_SETSYSPARAM_W* optional
    , "UInt", csetsysparam   ; DWORD
    , "Ptr", pcsetsucceed   ; DWORD* optional, out
    , "Int")   ; return: INT

●JetEnableMultiInstanceW(psetsysparam, csetsysparam, pcsetsucceed) = DLL("ESENT.dll", "int JetEnableMultiInstanceW(void*, dword, void*)")
# 呼び出し: JetEnableMultiInstanceW(psetsysparam, csetsysparam, pcsetsucceed)
# psetsysparam : JET_SETSYSPARAM_W* optional -> "void*"
# csetsysparam : DWORD -> "dword"
# pcsetsucceed : 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。