JetGetCurrentIndexW

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

INT JetGetCurrentIndexW(
    JET_SESID sesid,
    JET_TABLEID tableid,
    WORD* szIndexName,
    DWORD cbIndexName
);

<DllImport("ESENT.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function JetGetCurrentIndexW(
    sesid As UIntPtr,   ' JET_SESID
    tableid As UIntPtr,   ' JET_TABLEID
    <Out> ByRef szIndexName As UShort,   ' WORD* out
    cbIndexName As UInteger   ' DWORD
) As Integer
End Function

' sesid : JET_SESID
' tableid : JET_TABLEID
' szIndexName : WORD* out
' cbIndexName : DWORD
Declare PtrSafe Function JetGetCurrentIndexW Lib "esent" ( _
    ByVal sesid As LongPtr, _
    ByVal tableid As LongPtr, _
    ByRef szIndexName As Integer, _
    ByVal cbIndexName 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

JetGetCurrentIndexW = ctypes.windll.esent.JetGetCurrentIndexW
JetGetCurrentIndexW.restype = ctypes.c_int
JetGetCurrentIndexW.argtypes = [
    ctypes.c_size_t,  # sesid : JET_SESID
    ctypes.c_size_t,  # tableid : JET_TABLEID
    ctypes.POINTER(ctypes.c_ushort),  # szIndexName : WORD* out
    wintypes.DWORD,  # cbIndexName : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ESENT.dll')
JetGetCurrentIndexW = Fiddle::Function.new(
  lib['JetGetCurrentIndexW'],
  [
    Fiddle::TYPE_UINTPTR_T,  # sesid : JET_SESID
    Fiddle::TYPE_UINTPTR_T,  # tableid : JET_TABLEID
    Fiddle::TYPE_VOIDP,  # szIndexName : WORD* out
    -Fiddle::TYPE_INT,  # cbIndexName : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "esent")]
extern "system" {
    fn JetGetCurrentIndexW(
        sesid: usize,  // JET_SESID
        tableid: usize,  // JET_TABLEID
        szIndexName: *mut u16,  // WORD* out
        cbIndexName: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ESENT.dll", CharSet = CharSet.Unicode)]
public static extern int JetGetCurrentIndexW(UIntPtr sesid, UIntPtr tableid, out ushort szIndexName, uint cbIndexName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ESENT_JetGetCurrentIndexW' -Namespace Win32 -PassThru
# $api::JetGetCurrentIndexW(sesid, tableid, szIndexName, cbIndexName)

#uselib "ESENT.dll"
#func global JetGetCurrentIndexW "JetGetCurrentIndexW" wptr, wptr, wptr, wptr
; JetGetCurrentIndexW sesid, tableid, varptr(szIndexName), cbIndexName   ; 戻り値は stat
; sesid : JET_SESID -> "wptr"
; tableid : JET_TABLEID -> "wptr"
; szIndexName : WORD* out -> "wptr"
; cbIndexName : DWORD -> "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 JetGetCurrentIndexW "JetGetCurrentIndexW" sptr, sptr, var, int
; res = JetGetCurrentIndexW(sesid, tableid, szIndexName, cbIndexName)
; sesid : JET_SESID -> "sptr"
; tableid : JET_TABLEID -> "sptr"
; szIndexName : WORD* out -> "var"
; cbIndexName : DWORD -> "int"
; ※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 JetGetCurrentIndexW(JET_SESID sesid, JET_TABLEID tableid, WORD* szIndexName, DWORD cbIndexName)
#uselib "ESENT.dll"
#cfunc global JetGetCurrentIndexW "JetGetCurrentIndexW" intptr, intptr, var, int
; res = JetGetCurrentIndexW(sesid, tableid, szIndexName, cbIndexName)
; sesid : JET_SESID -> "intptr"
; tableid : JET_TABLEID -> "intptr"
; szIndexName : WORD* out -> "var"
; cbIndexName : DWORD -> "int"
; ※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")
	procJetGetCurrentIndexW = esent.NewProc("JetGetCurrentIndexW")
)

// sesid (JET_SESID), tableid (JET_TABLEID), szIndexName (WORD* out), cbIndexName (DWORD)
r1, _, err := procJetGetCurrentIndexW.Call(
	uintptr(sesid),
	uintptr(tableid),
	uintptr(szIndexName),
	uintptr(cbIndexName),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function JetGetCurrentIndexW(
  sesid: NativeUInt;   // JET_SESID
  tableid: NativeUInt;   // JET_TABLEID
  szIndexName: Pointer;   // WORD* out
  cbIndexName: DWORD   // DWORD
): Integer; stdcall;
  external 'ESENT.dll' name 'JetGetCurrentIndexW';

result := DllCall("ESENT\JetGetCurrentIndexW"
    , "UPtr", sesid   ; JET_SESID
    , "UPtr", tableid   ; JET_TABLEID
    , "Ptr", szIndexName   ; WORD* out
    , "UInt", cbIndexName   ; DWORD
    , "Int")   ; return: INT

●JetGetCurrentIndexW(sesid, tableid, szIndexName, cbIndexName) = DLL("ESENT.dll", "int JetGetCurrentIndexW(int, int, void*, dword)")
# 呼び出し: JetGetCurrentIndexW(sesid, tableid, szIndexName, cbIndexName)
# sesid : JET_SESID -> "int"
# tableid : JET_TABLEID -> "int"
# szIndexName : WORD* out -> "void*"
# cbIndexName : DWORD -> "dword"
# 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。