SQLGetDescRecW

// ODBC32.dll  (Unicode / -W)
#include <windows.h>

SHORT SQLGetDescRecW(
    void* hdesc,
    SHORT iRecord,
    WORD* szName,   // optional
    SHORT cchNameMax,
    SHORT* pcchName,   // optional
    SHORT* pfType,   // optional
    SHORT* pfSubType,   // optional
    INT* pLength,   // optional
    SHORT* pPrecision,   // optional
    SHORT* pScale,   // optional
    SHORT* pNullable   // optional
);

<DllImport("ODBC32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SQLGetDescRecW(
    hdesc As IntPtr,   ' void* in/out
    iRecord As Short,   ' SHORT
    szName As IntPtr,   ' WORD* optional, out
    cchNameMax As Short,   ' SHORT
    pcchName As IntPtr,   ' SHORT* optional, out
    pfType As IntPtr,   ' SHORT* optional, out
    pfSubType As IntPtr,   ' SHORT* optional, out
    pLength As IntPtr,   ' INT* optional, out
    pPrecision As IntPtr,   ' SHORT* optional, out
    pScale As IntPtr,   ' SHORT* optional, out
    pNullable As IntPtr   ' SHORT* optional, out
) As Short
End Function

' hdesc : void* in/out
' iRecord : SHORT
' szName : WORD* optional, out
' cchNameMax : SHORT
' pcchName : SHORT* optional, out
' pfType : SHORT* optional, out
' pfSubType : SHORT* optional, out
' pLength : INT* optional, out
' pPrecision : SHORT* optional, out
' pScale : SHORT* optional, out
' pNullable : SHORT* optional, out
Declare PtrSafe Function SQLGetDescRecW Lib "odbc32" ( _
    ByVal hdesc As LongPtr, _
    ByVal iRecord As Integer, _
    ByVal szName As LongPtr, _
    ByVal cchNameMax As Integer, _
    ByVal pcchName As LongPtr, _
    ByVal pfType As LongPtr, _
    ByVal pfSubType As LongPtr, _
    ByVal pLength As LongPtr, _
    ByVal pPrecision As LongPtr, _
    ByVal pScale As LongPtr, _
    ByVal pNullable As LongPtr) As Integer
' 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

SQLGetDescRecW = ctypes.windll.odbc32.SQLGetDescRecW
SQLGetDescRecW.restype = ctypes.c_short
SQLGetDescRecW.argtypes = [
    ctypes.POINTER(None),  # hdesc : void* in/out
    ctypes.c_short,  # iRecord : SHORT
    ctypes.POINTER(ctypes.c_ushort),  # szName : WORD* optional, out
    ctypes.c_short,  # cchNameMax : SHORT
    ctypes.POINTER(ctypes.c_short),  # pcchName : SHORT* optional, out
    ctypes.POINTER(ctypes.c_short),  # pfType : SHORT* optional, out
    ctypes.POINTER(ctypes.c_short),  # pfSubType : SHORT* optional, out
    ctypes.POINTER(ctypes.c_int),  # pLength : INT* optional, out
    ctypes.POINTER(ctypes.c_short),  # pPrecision : SHORT* optional, out
    ctypes.POINTER(ctypes.c_short),  # pScale : SHORT* optional, out
    ctypes.POINTER(ctypes.c_short),  # pNullable : SHORT* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ODBC32.dll')
SQLGetDescRecW = Fiddle::Function.new(
  lib['SQLGetDescRecW'],
  [
    Fiddle::TYPE_VOIDP,  # hdesc : void* in/out
    Fiddle::TYPE_SHORT,  # iRecord : SHORT
    Fiddle::TYPE_VOIDP,  # szName : WORD* optional, out
    Fiddle::TYPE_SHORT,  # cchNameMax : SHORT
    Fiddle::TYPE_VOIDP,  # pcchName : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # pfType : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # pfSubType : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # pLength : INT* optional, out
    Fiddle::TYPE_VOIDP,  # pPrecision : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # pScale : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # pNullable : SHORT* optional, out
  ],
  Fiddle::TYPE_SHORT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "odbc32")]
extern "system" {
    fn SQLGetDescRecW(
        hdesc: *mut (),  // void* in/out
        iRecord: i16,  // SHORT
        szName: *mut u16,  // WORD* optional, out
        cchNameMax: i16,  // SHORT
        pcchName: *mut i16,  // SHORT* optional, out
        pfType: *mut i16,  // SHORT* optional, out
        pfSubType: *mut i16,  // SHORT* optional, out
        pLength: *mut i32,  // INT* optional, out
        pPrecision: *mut i16,  // SHORT* optional, out
        pScale: *mut i16,  // SHORT* optional, out
        pNullable: *mut i16  // SHORT* optional, out
    ) -> i16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ODBC32.dll", CharSet = CharSet.Unicode)]
public static extern short SQLGetDescRecW(IntPtr hdesc, short iRecord, IntPtr szName, short cchNameMax, IntPtr pcchName, IntPtr pfType, IntPtr pfSubType, IntPtr pLength, IntPtr pPrecision, IntPtr pScale, IntPtr pNullable);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ODBC32_SQLGetDescRecW' -Namespace Win32 -PassThru
# $api::SQLGetDescRecW(hdesc, iRecord, szName, cchNameMax, pcchName, pfType, pfSubType, pLength, pPrecision, pScale, pNullable)

#uselib "ODBC32.dll"
#func global SQLGetDescRecW "SQLGetDescRecW" wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr
; SQLGetDescRecW hdesc, iRecord, varptr(szName), cchNameMax, varptr(pcchName), varptr(pfType), varptr(pfSubType), varptr(pLength), varptr(pPrecision), varptr(pScale), varptr(pNullable)   ; 戻り値は stat
; hdesc : void* in/out -> "wptr"
; iRecord : SHORT -> "wptr"
; szName : WORD* optional, out -> "wptr"
; cchNameMax : SHORT -> "wptr"
; pcchName : SHORT* optional, out -> "wptr"
; pfType : SHORT* optional, out -> "wptr"
; pfSubType : SHORT* optional, out -> "wptr"
; pLength : INT* optional, out -> "wptr"
; pPrecision : SHORT* optional, out -> "wptr"
; pScale : SHORT* optional, out -> "wptr"
; pNullable : SHORT* 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。

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

var (
	odbc32 = windows.NewLazySystemDLL("ODBC32.dll")
	procSQLGetDescRecW = odbc32.NewProc("SQLGetDescRecW")
)

// hdesc (void* in/out), iRecord (SHORT), szName (WORD* optional, out), cchNameMax (SHORT), pcchName (SHORT* optional, out), pfType (SHORT* optional, out), pfSubType (SHORT* optional, out), pLength (INT* optional, out), pPrecision (SHORT* optional, out), pScale (SHORT* optional, out), pNullable (SHORT* optional, out)
r1, _, err := procSQLGetDescRecW.Call(
	uintptr(hdesc),
	uintptr(iRecord),
	uintptr(szName),
	uintptr(cchNameMax),
	uintptr(pcchName),
	uintptr(pfType),
	uintptr(pfSubType),
	uintptr(pLength),
	uintptr(pPrecision),
	uintptr(pScale),
	uintptr(pNullable),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SHORT

function SQLGetDescRecW(
  hdesc: Pointer;   // void* in/out
  iRecord: Smallint;   // SHORT
  szName: Pointer;   // WORD* optional, out
  cchNameMax: Smallint;   // SHORT
  pcchName: Pointer;   // SHORT* optional, out
  pfType: Pointer;   // SHORT* optional, out
  pfSubType: Pointer;   // SHORT* optional, out
  pLength: Pointer;   // INT* optional, out
  pPrecision: Pointer;   // SHORT* optional, out
  pScale: Pointer;   // SHORT* optional, out
  pNullable: Pointer   // SHORT* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLGetDescRecW';

result := DllCall("ODBC32\SQLGetDescRecW"
    , "Ptr", hdesc   ; void* in/out
    , "Short", iRecord   ; SHORT
    , "Ptr", szName   ; WORD* optional, out
    , "Short", cchNameMax   ; SHORT
    , "Ptr", pcchName   ; SHORT* optional, out
    , "Ptr", pfType   ; SHORT* optional, out
    , "Ptr", pfSubType   ; SHORT* optional, out
    , "Ptr", pLength   ; INT* optional, out
    , "Ptr", pPrecision   ; SHORT* optional, out
    , "Ptr", pScale   ; SHORT* optional, out
    , "Ptr", pNullable   ; SHORT* optional, out
    , "Short")   ; return: SHORT

●SQLGetDescRecW(hdesc, iRecord, szName, cchNameMax, pcchName, pfType, pfSubType, pLength, pPrecision, pScale, pNullable) = DLL("ODBC32.dll", "int SQLGetDescRecW(void*, int, void*, int, void*, void*, void*, void*, void*, void*, void*)")
# 呼び出し: SQLGetDescRecW(hdesc, iRecord, szName, cchNameMax, pcchName, pfType, pfSubType, pLength, pPrecision, pScale, pNullable)
# hdesc : void* in/out -> "void*"
# iRecord : SHORT -> "int"
# szName : WORD* optional, out -> "void*"
# cchNameMax : SHORT -> "int"
# pcchName : SHORT* optional, out -> "void*"
# pfType : SHORT* optional, out -> "void*"
# pfSubType : SHORT* optional, out -> "void*"
# pLength : INT* optional, out -> "void*"
# pPrecision : SHORT* optional, out -> "void*"
# pScale : SHORT* optional, out -> "void*"
# pNullable : SHORT* 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。

const std = @import("std");

extern "odbc32" fn SQLGetDescRecW(
    hdesc: ?*anyopaque, // void* in/out
    iRecord: i16, // SHORT
    szName: [*c]u16, // WORD* optional, out
    cchNameMax: i16, // SHORT
    pcchName: [*c]i16, // SHORT* optional, out
    pfType: [*c]i16, // SHORT* optional, out
    pfSubType: [*c]i16, // SHORT* optional, out
    pLength: [*c]i32, // INT* optional, out
    pPrecision: [*c]i16, // SHORT* optional, out
    pScale: [*c]i16, // SHORT* optional, out
    pNullable: [*c]i16 // SHORT* optional, out
) callconv(std.os.windows.WINAPI) i16;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc SQLGetDescRecW(
    hdesc: pointer,  # void* in/out
    iRecord: int16,  # SHORT
    szName: ptr uint16,  # WORD* optional, out
    cchNameMax: int16,  # SHORT
    pcchName: ptr int16,  # SHORT* optional, out
    pfType: ptr int16,  # SHORT* optional, out
    pfSubType: ptr int16,  # SHORT* optional, out
    pLength: ptr int32,  # INT* optional, out
    pPrecision: ptr int16,  # SHORT* optional, out
    pScale: ptr int16,  # SHORT* optional, out
    pNullable: ptr int16  # SHORT* optional, out
): int16 {.importc: "SQLGetDescRecW", stdcall, dynlib: "ODBC32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "odbc32");
extern(Windows)
short SQLGetDescRecW(
    void* hdesc,   // void* in/out
    short iRecord,   // SHORT
    ushort* szName,   // WORD* optional, out
    short cchNameMax,   // SHORT
    short* pcchName,   // SHORT* optional, out
    short* pfType,   // SHORT* optional, out
    short* pfSubType,   // SHORT* optional, out
    int* pLength,   // INT* optional, out
    short* pPrecision,   // SHORT* optional, out
    short* pScale,   // SHORT* optional, out
    short* pNullable   // SHORT* optional, out
);

ccall((:SQLGetDescRecW, "ODBC32.dll"), stdcall, Int16,
      (Ptr{Cvoid}, Int16, Ptr{UInt16}, Int16, Ptr{Int16}, Ptr{Int16}, Ptr{Int16}, Ptr{Int32}, Ptr{Int16}, Ptr{Int16}, Ptr{Int16}),
      hdesc, iRecord, szName, cchNameMax, pcchName, pfType, pfSubType, pLength, pPrecision, pScale, pNullable)
# hdesc : void* in/out -> Ptr{Cvoid}
# iRecord : SHORT -> Int16
# szName : WORD* optional, out -> Ptr{UInt16}
# cchNameMax : SHORT -> Int16
# pcchName : SHORT* optional, out -> Ptr{Int16}
# pfType : SHORT* optional, out -> Ptr{Int16}
# pfSubType : SHORT* optional, out -> Ptr{Int16}
# pLength : INT* optional, out -> Ptr{Int32}
# pPrecision : SHORT* optional, out -> Ptr{Int16}
# pScale : SHORT* optional, out -> Ptr{Int16}
# pNullable : SHORT* optional, out -> Ptr{Int16}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
# Unicode(-W): Cwstring には transcode(UInt16, "...") 等で UTF-16 を渡す。

local ffi = require("ffi")
ffi.cdef[[
int16_t SQLGetDescRecW(
    void* hdesc,
    int16_t iRecord,
    uint16_t* szName,
    int16_t cchNameMax,
    int16_t* pcchName,
    int16_t* pfType,
    int16_t* pfSubType,
    int32_t* pLength,
    int16_t* pPrecision,
    int16_t* pScale,
    int16_t* pNullable);
]]
local odbc32 = ffi.load("odbc32")
-- odbc32.SQLGetDescRecW(hdesc, iRecord, szName, cchNameMax, pcchName, pfType, pfSubType, pLength, pPrecision, pScale, pNullable)
-- hdesc : void* in/out
-- iRecord : SHORT
-- szName : WORD* optional, out
-- cchNameMax : SHORT
-- pcchName : SHORT* optional, out
-- pfType : SHORT* optional, out
-- pfSubType : SHORT* optional, out
-- pLength : INT* optional, out
-- pPrecision : SHORT* optional, out
-- pScale : SHORT* optional, out
-- pNullable : SHORT* 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。
-- Unicode(-W): uint16_t* には UTF-16LE のバッファ(ffi.new("uint16_t[?]", ...))を渡す。

const koffi = require('koffi');
const lib = koffi.load('ODBC32.dll');
const SQLGetDescRecW = lib.func('__stdcall', 'SQLGetDescRecW', 'int16_t', ['void *', 'int16_t', 'uint16_t *', 'int16_t', 'int16_t *', 'int16_t *', 'int16_t *', 'int32_t *', 'int16_t *', 'int16_t *', 'int16_t *']);
// SQLGetDescRecW(hdesc, iRecord, szName, cchNameMax, pcchName, pfType, pfSubType, pLength, pPrecision, pScale, pNullable)
// hdesc : void* in/out -> 'void *'
// iRecord : SHORT -> 'int16_t'
// szName : WORD* optional, out -> 'uint16_t *'
// cchNameMax : SHORT -> 'int16_t'
// pcchName : SHORT* optional, out -> 'int16_t *'
// pfType : SHORT* optional, out -> 'int16_t *'
// pfSubType : SHORT* optional, out -> 'int16_t *'
// pLength : INT* optional, out -> 'int32_t *'
// pPrecision : SHORT* optional, out -> 'int16_t *'
// pScale : SHORT* optional, out -> 'int16_t *'
// pNullable : SHORT* optional, out -> 'int16_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("ODBC32.dll", {
  SQLGetDescRecW: { parameters: ["pointer", "i16", "pointer", "i16", "pointer", "pointer", "pointer", "pointer", "pointer", "pointer", "pointer"], result: "i16" },
});
// lib.symbols.SQLGetDescRecW(hdesc, iRecord, szName, cchNameMax, pcchName, pfType, pfSubType, pLength, pPrecision, pScale, pNullable)
// hdesc : void* in/out -> "pointer"
// iRecord : SHORT -> "i16"
// szName : WORD* optional, out -> "pointer"
// cchNameMax : SHORT -> "i16"
// pcchName : SHORT* optional, out -> "pointer"
// pfType : SHORT* optional, out -> "pointer"
// pfSubType : SHORT* optional, out -> "pointer"
// pLength : INT* optional, out -> "pointer"
// pPrecision : SHORT* optional, out -> "pointer"
// pScale : SHORT* optional, out -> "pointer"
// pNullable : SHORT* optional, out -> "pointer"
// 文字列は "buffer"。Unicode(-W) は new TextEncoder() ではなく UTF-16LE のバイト列(末尾に \x00\x00)を Uint8Array で渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int16_t SQLGetDescRecW(
    void* hdesc,
    int16_t iRecord,
    uint16_t* szName,
    int16_t cchNameMax,
    int16_t* pcchName,
    int16_t* pfType,
    int16_t* pfSubType,
    int32_t* pLength,
    int16_t* pPrecision,
    int16_t* pScale,
    int16_t* pNullable);
C, "ODBC32.dll");
// $ffi->SQLGetDescRecW(hdesc, iRecord, szName, cchNameMax, pcchName, pfType, pfSubType, pLength, pPrecision, pScale, pNullable);
// hdesc : void* in/out
// iRecord : SHORT
// szName : WORD* optional, out
// cchNameMax : SHORT
// pcchName : SHORT* optional, out
// pfType : SHORT* optional, out
// pfSubType : SHORT* optional, out
// pLength : INT* optional, out
// pPrecision : SHORT* optional, out
// pScale : SHORT* optional, out
// pNullable : SHORT* 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 Odbc32 extends StdCallLibrary {
    Odbc32 INSTANCE = Native.load("odbc32", Odbc32.class, W32APIOptions.UNICODE_OPTIONS);
    short SQLGetDescRecW(
        Pointer hdesc,   // void* in/out
        short iRecord,   // SHORT
        ShortByReference szName,   // WORD* optional, out
        short cchNameMax,   // SHORT
        ShortByReference pcchName,   // SHORT* optional, out
        ShortByReference pfType,   // SHORT* optional, out
        ShortByReference pfSubType,   // SHORT* optional, out
        IntByReference pLength,   // INT* optional, out
        ShortByReference pPrecision,   // SHORT* optional, out
        ShortByReference pScale,   // SHORT* optional, out
        ShortByReference pNullable   // SHORT* optional, out
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("odbc32")]
lib LibODBC32
  fun SQLGetDescRecW = SQLGetDescRecW(
    hdesc : Void*,   # void* in/out
    iRecord : Int16,   # SHORT
    szName : UInt16*,   # WORD* optional, out
    cchNameMax : Int16,   # SHORT
    pcchName : Int16*,   # SHORT* optional, out
    pfType : Int16*,   # SHORT* optional, out
    pfSubType : Int16*,   # SHORT* optional, out
    pLength : Int32*,   # INT* optional, out
    pPrecision : Int16*,   # SHORT* optional, out
    pScale : Int16*,   # SHORT* optional, out
    pNullable : Int16*   # SHORT* optional, out
  ) : Int16
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 SQLGetDescRecWNative = Int16 Function(Pointer<Void>, Int16, Pointer<Uint16>, Int16, Pointer<Int16>, Pointer<Int16>, Pointer<Int16>, Pointer<Int32>, Pointer<Int16>, Pointer<Int16>, Pointer<Int16>);
typedef SQLGetDescRecWDart = int Function(Pointer<Void>, int, Pointer<Uint16>, int, Pointer<Int16>, Pointer<Int16>, Pointer<Int16>, Pointer<Int32>, Pointer<Int16>, Pointer<Int16>, Pointer<Int16>);
final SQLGetDescRecW = DynamicLibrary.open('ODBC32.dll')
    .lookupFunction<SQLGetDescRecWNative, SQLGetDescRecWDart>('SQLGetDescRecW');
// hdesc : void* in/out -> Pointer<Void>
// iRecord : SHORT -> Int16
// szName : WORD* optional, out -> Pointer<Uint16>
// cchNameMax : SHORT -> Int16
// pcchName : SHORT* optional, out -> Pointer<Int16>
// pfType : SHORT* optional, out -> Pointer<Int16>
// pfSubType : SHORT* optional, out -> Pointer<Int16>
// pLength : INT* optional, out -> Pointer<Int32>
// pPrecision : SHORT* optional, out -> Pointer<Int16>
// pScale : SHORT* optional, out -> Pointer<Int16>
// pNullable : SHORT* optional, out -> Pointer<Int16>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SQLGetDescRecW(
  hdesc: Pointer;   // void* in/out
  iRecord: Smallint;   // SHORT
  szName: Pointer;   // WORD* optional, out
  cchNameMax: Smallint;   // SHORT
  pcchName: Pointer;   // SHORT* optional, out
  pfType: Pointer;   // SHORT* optional, out
  pfSubType: Pointer;   // SHORT* optional, out
  pLength: Pointer;   // INT* optional, out
  pPrecision: Pointer;   // SHORT* optional, out
  pScale: Pointer;   // SHORT* optional, out
  pNullable: Pointer   // SHORT* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLGetDescRecW';

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

foreign import stdcall safe "SQLGetDescRecW"
  c_SQLGetDescRecW :: Ptr () -> Int16 -> Ptr Word16 -> Int16 -> Ptr Int16 -> Ptr Int16 -> Ptr Int16 -> Ptr Int32 -> Ptr Int16 -> Ptr Int16 -> Ptr Int16 -> IO Int16
-- hdesc : void* in/out -> Ptr ()
-- iRecord : SHORT -> Int16
-- szName : WORD* optional, out -> Ptr Word16
-- cchNameMax : SHORT -> Int16
-- pcchName : SHORT* optional, out -> Ptr Int16
-- pfType : SHORT* optional, out -> Ptr Int16
-- pfSubType : SHORT* optional, out -> Ptr Int16
-- pLength : INT* optional, out -> Ptr Int32
-- pPrecision : SHORT* optional, out -> Ptr Int16
-- pScale : SHORT* optional, out -> Ptr Int16
-- pNullable : SHORT* optional, out -> Ptr Int16
-- 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 sqlgetdescrecw =
  foreign "SQLGetDescRecW"
    ((ptr void) @-> int16_t @-> (ptr uint16_t) @-> int16_t @-> (ptr int16_t) @-> (ptr int16_t) @-> (ptr int16_t) @-> (ptr int32_t) @-> (ptr int16_t) @-> (ptr int16_t) @-> (ptr int16_t) @-> returning int16_t)
(* hdesc : void* in/out -> (ptr void) *)
(* iRecord : SHORT -> int16_t *)
(* szName : WORD* optional, out -> (ptr uint16_t) *)
(* cchNameMax : SHORT -> int16_t *)
(* pcchName : SHORT* optional, out -> (ptr int16_t) *)
(* pfType : SHORT* optional, out -> (ptr int16_t) *)
(* pfSubType : SHORT* optional, out -> (ptr int16_t) *)
(* pLength : INT* optional, out -> (ptr int32_t) *)
(* pPrecision : SHORT* optional, out -> (ptr int16_t) *)
(* pScale : SHORT* optional, out -> (ptr int16_t) *)
(* pNullable : SHORT* optional, out -> (ptr int16_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 odbc32 (t "ODBC32.dll"))
(cffi:use-foreign-library odbc32)

(cffi:defcfun ("SQLGetDescRecW" sqlget-desc-rec-w :convention :stdcall) :int16
  (hdesc :pointer)   ; void* in/out
  (i-record :int16)   ; SHORT
  (sz-name :pointer)   ; WORD* optional, out
  (cch-name-max :int16)   ; SHORT
  (pcch-name :pointer)   ; SHORT* optional, out
  (pf-type :pointer)   ; SHORT* optional, out
  (pf-sub-type :pointer)   ; SHORT* optional, out
  (p-length :pointer)   ; INT* optional, out
  (p-precision :pointer)   ; SHORT* optional, out
  (p-scale :pointer)   ; SHORT* optional, out
  (p-nullable :pointer))   ; SHORT* optional, out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SQLGetDescRecW = Win32::API::More->new('ODBC32',
    'short SQLGetDescRecW(LPVOID hdesc, short iRecord, LPVOID szName, short cchNameMax, LPVOID pcchName, LPVOID pfType, LPVOID pfSubType, LPVOID pLength, LPVOID pPrecision, LPVOID pScale, LPVOID pNullable)');
# my $ret = $SQLGetDescRecW->Call($hdesc, $iRecord, $szName, $cchNameMax, $pcchName, $pfType, $pfSubType, $pLength, $pPrecision, $pScale, $pNullable);
# hdesc : void* in/out -> LPVOID
# iRecord : SHORT -> short
# szName : WORD* optional, out -> LPVOID
# cchNameMax : SHORT -> short
# pcchName : SHORT* optional, out -> LPVOID
# pfType : SHORT* optional, out -> LPVOID
# pfSubType : SHORT* optional, out -> LPVOID
# pLength : INT* optional, out -> LPVOID
# pPrecision : SHORT* optional, out -> LPVOID
# pScale : SHORT* optional, out -> LPVOID
# pNullable : SHORT* 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。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。