JetGetTableColumnInfoW

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

INT JetGetTableColumnInfoW(
    JET_SESID sesid,
    JET_TABLEID tableid,
    WORD* szColumnName,   // optional
    void* pvResult,
    DWORD cbMax,
    DWORD InfoLevel
);

<DllImport("ESENT.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function JetGetTableColumnInfoW(
    sesid As UIntPtr,   ' JET_SESID
    tableid As UIntPtr,   ' JET_TABLEID
    szColumnName As IntPtr,   ' WORD* optional
    pvResult As IntPtr,   ' void* out
    cbMax As UInteger,   ' DWORD
    InfoLevel As UInteger   ' DWORD
) As Integer
End Function

' sesid : JET_SESID
' tableid : JET_TABLEID
' szColumnName : WORD* optional
' pvResult : void* out
' cbMax : DWORD
' InfoLevel : DWORD
Declare PtrSafe Function JetGetTableColumnInfoW Lib "esent" ( _
    ByVal sesid As LongPtr, _
    ByVal tableid As LongPtr, _
    ByVal szColumnName As LongPtr, _
    ByVal pvResult As LongPtr, _
    ByVal cbMax As Long, _
    ByVal InfoLevel 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

JetGetTableColumnInfoW = ctypes.windll.esent.JetGetTableColumnInfoW
JetGetTableColumnInfoW.restype = ctypes.c_int
JetGetTableColumnInfoW.argtypes = [
    ctypes.c_size_t,  # sesid : JET_SESID
    ctypes.c_size_t,  # tableid : JET_TABLEID
    ctypes.POINTER(ctypes.c_ushort),  # szColumnName : WORD* optional
    ctypes.POINTER(None),  # pvResult : void* out
    wintypes.DWORD,  # cbMax : DWORD
    wintypes.DWORD,  # InfoLevel : DWORD
]

require 'fiddle'
require 'fiddle/import'

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

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

$sig = @"
[DllImport("ESENT.dll", CharSet = CharSet.Unicode)]
public static extern int JetGetTableColumnInfoW(UIntPtr sesid, UIntPtr tableid, IntPtr szColumnName, IntPtr pvResult, uint cbMax, uint InfoLevel);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ESENT_JetGetTableColumnInfoW' -Namespace Win32 -PassThru
# $api::JetGetTableColumnInfoW(sesid, tableid, szColumnName, pvResult, cbMax, InfoLevel)

#uselib "ESENT.dll"
#func global JetGetTableColumnInfoW "JetGetTableColumnInfoW" wptr, wptr, wptr, wptr, wptr, wptr
; JetGetTableColumnInfoW sesid, tableid, varptr(szColumnName), pvResult, cbMax, InfoLevel   ; 戻り値は stat
; sesid : JET_SESID -> "wptr"
; tableid : JET_TABLEID -> "wptr"
; szColumnName : WORD* optional -> "wptr"
; pvResult : void* out -> "wptr"
; cbMax : DWORD -> "wptr"
; InfoLevel : 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 JetGetTableColumnInfoW "JetGetTableColumnInfoW" sptr, sptr, var, sptr, int, int
; res = JetGetTableColumnInfoW(sesid, tableid, szColumnName, pvResult, cbMax, InfoLevel)
; sesid : JET_SESID -> "sptr"
; tableid : JET_TABLEID -> "sptr"
; szColumnName : WORD* optional -> "var"
; pvResult : void* out -> "sptr"
; cbMax : DWORD -> "int"
; InfoLevel : 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 JetGetTableColumnInfoW(JET_SESID sesid, JET_TABLEID tableid, WORD* szColumnName, void* pvResult, DWORD cbMax, DWORD InfoLevel)
#uselib "ESENT.dll"
#cfunc global JetGetTableColumnInfoW "JetGetTableColumnInfoW" intptr, intptr, var, intptr, int, int
; res = JetGetTableColumnInfoW(sesid, tableid, szColumnName, pvResult, cbMax, InfoLevel)
; sesid : JET_SESID -> "intptr"
; tableid : JET_TABLEID -> "intptr"
; szColumnName : WORD* optional -> "var"
; pvResult : void* out -> "intptr"
; cbMax : DWORD -> "int"
; InfoLevel : 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")
	procJetGetTableColumnInfoW = esent.NewProc("JetGetTableColumnInfoW")
)

// sesid (JET_SESID), tableid (JET_TABLEID), szColumnName (WORD* optional), pvResult (void* out), cbMax (DWORD), InfoLevel (DWORD)
r1, _, err := procJetGetTableColumnInfoW.Call(
	uintptr(sesid),
	uintptr(tableid),
	uintptr(szColumnName),
	uintptr(pvResult),
	uintptr(cbMax),
	uintptr(InfoLevel),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function JetGetTableColumnInfoW(
  sesid: NativeUInt;   // JET_SESID
  tableid: NativeUInt;   // JET_TABLEID
  szColumnName: Pointer;   // WORD* optional
  pvResult: Pointer;   // void* out
  cbMax: DWORD;   // DWORD
  InfoLevel: DWORD   // DWORD
): Integer; stdcall;
  external 'ESENT.dll' name 'JetGetTableColumnInfoW';

result := DllCall("ESENT\JetGetTableColumnInfoW"
    , "UPtr", sesid   ; JET_SESID
    , "UPtr", tableid   ; JET_TABLEID
    , "Ptr", szColumnName   ; WORD* optional
    , "Ptr", pvResult   ; void* out
    , "UInt", cbMax   ; DWORD
    , "UInt", InfoLevel   ; DWORD
    , "Int")   ; return: INT

●JetGetTableColumnInfoW(sesid, tableid, szColumnName, pvResult, cbMax, InfoLevel) = DLL("ESENT.dll", "int JetGetTableColumnInfoW(int, int, void*, void*, dword, dword)")
# 呼び出し: JetGetTableColumnInfoW(sesid, tableid, szColumnName, pvResult, cbMax, InfoLevel)
# sesid : JET_SESID -> "int"
# tableid : JET_TABLEID -> "int"
# szColumnName : WORD* optional -> "void*"
# pvResult : void* out -> "void*"
# cbMax : DWORD -> "dword"
# InfoLevel : 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。