SQLDriversW

関数

インストール済みODBCドライバを順に列挙する(Unicode)。

DLLODBC32.dll文字セットUnicode (-W)呼出規約winapi

シグネチャ

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

SHORT SQLDriversW(
    void* henv,
    WORD fDirection,
    WORD* szDriverDesc,   // optional
    SHORT cchDriverDescMax,
    SHORT* pcchDriverDesc,   // optional
    WORD* szDriverAttributes,   // optional
    SHORT cchDrvrAttrMax,
    SHORT* pcchDrvrAttr   // optional
);

パラメーター

名前	型	方向	説明
henv	void*	inout	ODBCの環境ハンドル。インストール済みドライバの列挙対象。
fDirection	WORD	in	取得方向。SQL_FETCH_FIRSTまたはSQL_FETCH_NEXTを指定して列挙する。
szDriverDesc	WORD*	outoptional	ドライバ記述を受け取るバッファ。出力用。
cchDriverDescMax	SHORT	in	szDriverDescバッファの最大文字数。
pcchDriverDesc	SHORT*	outoptional	実際に返されたドライバ記述の文字数を受け取るポインタ。
szDriverAttributes	WORD*	outoptional	ドライバ属性(key=value;...)を受け取るバッファ。出力用。
cchDrvrAttrMax	SHORT	in	szDriverAttributesバッファの最大文字数。
pcchDrvrAttr	SHORT*	outoptional	実際に返された属性文字列の文字数を受け取るポインタ。

戻り値の型: SHORT

各言語での呼び出し定義

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

SHORT SQLDriversW(
    void* henv,
    WORD fDirection,
    WORD* szDriverDesc,   // optional
    SHORT cchDriverDescMax,
    SHORT* pcchDriverDesc,   // optional
    WORD* szDriverAttributes,   // optional
    SHORT cchDrvrAttrMax,
    SHORT* pcchDrvrAttr   // optional
);

[DllImport("ODBC32.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
static extern short SQLDriversW(
    IntPtr henv,   // void* in/out
    ushort fDirection,   // WORD
    IntPtr szDriverDesc,   // WORD* optional, out
    short cchDriverDescMax,   // SHORT
    IntPtr pcchDriverDesc,   // SHORT* optional, out
    IntPtr szDriverAttributes,   // WORD* optional, out
    short cchDrvrAttrMax,   // SHORT
    IntPtr pcchDrvrAttr   // SHORT* optional, out
);

<DllImport("ODBC32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SQLDriversW(
    henv As IntPtr,   ' void* in/out
    fDirection As UShort,   ' WORD
    szDriverDesc As IntPtr,   ' WORD* optional, out
    cchDriverDescMax As Short,   ' SHORT
    pcchDriverDesc As IntPtr,   ' SHORT* optional, out
    szDriverAttributes As IntPtr,   ' WORD* optional, out
    cchDrvrAttrMax As Short,   ' SHORT
    pcchDrvrAttr As IntPtr   ' SHORT* optional, out
) As Short
End Function

' henv : void* in/out
' fDirection : WORD
' szDriverDesc : WORD* optional, out
' cchDriverDescMax : SHORT
' pcchDriverDesc : SHORT* optional, out
' szDriverAttributes : WORD* optional, out
' cchDrvrAttrMax : SHORT
' pcchDrvrAttr : SHORT* optional, out
Declare PtrSafe Function SQLDriversW Lib "odbc32" ( _
    ByVal henv As LongPtr, _
    ByVal fDirection As Integer, _
    ByVal szDriverDesc As LongPtr, _
    ByVal cchDriverDescMax As Integer, _
    ByVal pcchDriverDesc As LongPtr, _
    ByVal szDriverAttributes As LongPtr, _
    ByVal cchDrvrAttrMax As Integer, _
    ByVal pcchDrvrAttr 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

SQLDriversW = ctypes.windll.odbc32.SQLDriversW
SQLDriversW.restype = ctypes.c_short
SQLDriversW.argtypes = [
    ctypes.POINTER(None),  # henv : void* in/out
    ctypes.c_ushort,  # fDirection : WORD
    ctypes.POINTER(ctypes.c_ushort),  # szDriverDesc : WORD* optional, out
    ctypes.c_short,  # cchDriverDescMax : SHORT
    ctypes.POINTER(ctypes.c_short),  # pcchDriverDesc : SHORT* optional, out
    ctypes.POINTER(ctypes.c_ushort),  # szDriverAttributes : WORD* optional, out
    ctypes.c_short,  # cchDrvrAttrMax : SHORT
    ctypes.POINTER(ctypes.c_short),  # pcchDrvrAttr : SHORT* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ODBC32.dll')
SQLDriversW = Fiddle::Function.new(
  lib['SQLDriversW'],
  [
    Fiddle::TYPE_VOIDP,  # henv : void* in/out
    -Fiddle::TYPE_SHORT,  # fDirection : WORD
    Fiddle::TYPE_VOIDP,  # szDriverDesc : WORD* optional, out
    Fiddle::TYPE_SHORT,  # cchDriverDescMax : SHORT
    Fiddle::TYPE_VOIDP,  # pcchDriverDesc : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # szDriverAttributes : WORD* optional, out
    Fiddle::TYPE_SHORT,  # cchDrvrAttrMax : SHORT
    Fiddle::TYPE_VOIDP,  # pcchDrvrAttr : SHORT* optional, out
  ],
  Fiddle::TYPE_SHORT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "odbc32")]
extern "system" {
    fn SQLDriversW(
        henv: *mut (),  // void* in/out
        fDirection: u16,  // WORD
        szDriverDesc: *mut u16,  // WORD* optional, out
        cchDriverDescMax: i16,  // SHORT
        pcchDriverDesc: *mut i16,  // SHORT* optional, out
        szDriverAttributes: *mut u16,  // WORD* optional, out
        cchDrvrAttrMax: i16,  // SHORT
        pcchDrvrAttr: *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 SQLDriversW(IntPtr henv, ushort fDirection, IntPtr szDriverDesc, short cchDriverDescMax, IntPtr pcchDriverDesc, IntPtr szDriverAttributes, short cchDrvrAttrMax, IntPtr pcchDrvrAttr);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ODBC32_SQLDriversW' -Namespace Win32 -PassThru
# $api::SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr)

#uselib "ODBC32.dll"
#func global SQLDriversW "SQLDriversW" wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr
; SQLDriversW henv, fDirection, varptr(szDriverDesc), cchDriverDescMax, varptr(pcchDriverDesc), varptr(szDriverAttributes), cchDrvrAttrMax, varptr(pcchDrvrAttr)   ; 戻り値は stat
; henv : void* in/out -> "wptr"
; fDirection : WORD -> "wptr"
; szDriverDesc : WORD* optional, out -> "wptr"
; cchDriverDescMax : SHORT -> "wptr"
; pcchDriverDesc : SHORT* optional, out -> "wptr"
; szDriverAttributes : WORD* optional, out -> "wptr"
; cchDrvrAttrMax : SHORT -> "wptr"
; pcchDrvrAttr : 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。

出力引数:

#uselib "ODBC32.dll"
#cfunc global SQLDriversW "SQLDriversW" sptr, int, var, int, var, var, int, var
; res = SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr)
; henv : void* in/out -> "sptr"
; fDirection : WORD -> "int"
; szDriverDesc : WORD* optional, out -> "var"
; cchDriverDescMax : SHORT -> "int"
; pcchDriverDesc : SHORT* optional, out -> "var"
; szDriverAttributes : WORD* optional, out -> "var"
; cchDrvrAttrMax : SHORT -> "int"
; pcchDrvrAttr : SHORT* 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。#uselib "ODBC32.dll"
#cfunc global SQLDriversW "SQLDriversW" sptr, int, sptr, int, sptr, sptr, int, sptr
; res = SQLDriversW(henv, fDirection, varptr(szDriverDesc), cchDriverDescMax, varptr(pcchDriverDesc), varptr(szDriverAttributes), cchDrvrAttrMax, varptr(pcchDrvrAttr))
; henv : void* in/out -> "sptr"
; fDirection : WORD -> "int"
; szDriverDesc : WORD* optional, out -> "sptr"
; cchDriverDescMax : SHORT -> "int"
; pcchDriverDesc : SHORT* optional, out -> "sptr"
; szDriverAttributes : WORD* optional, out -> "sptr"
; cchDrvrAttrMax : SHORT -> "int"
; pcchDrvrAttr : SHORT* optional, out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; SHORT SQLDriversW(void* henv, WORD fDirection, WORD* szDriverDesc, SHORT cchDriverDescMax, SHORT* pcchDriverDesc, WORD* szDriverAttributes, SHORT cchDrvrAttrMax, SHORT* pcchDrvrAttr)
#uselib "ODBC32.dll"
#cfunc global SQLDriversW "SQLDriversW" intptr, int, var, int, var, var, int, var
; res = SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr)
; henv : void* in/out -> "intptr"
; fDirection : WORD -> "int"
; szDriverDesc : WORD* optional, out -> "var"
; cchDriverDescMax : SHORT -> "int"
; pcchDriverDesc : SHORT* optional, out -> "var"
; szDriverAttributes : WORD* optional, out -> "var"
; cchDrvrAttrMax : SHORT -> "int"
; pcchDrvrAttr : SHORT* 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。; SHORT SQLDriversW(void* henv, WORD fDirection, WORD* szDriverDesc, SHORT cchDriverDescMax, SHORT* pcchDriverDesc, WORD* szDriverAttributes, SHORT cchDrvrAttrMax, SHORT* pcchDrvrAttr)
#uselib "ODBC32.dll"
#cfunc global SQLDriversW "SQLDriversW" intptr, int, intptr, int, intptr, intptr, int, intptr
; res = SQLDriversW(henv, fDirection, varptr(szDriverDesc), cchDriverDescMax, varptr(pcchDriverDesc), varptr(szDriverAttributes), cchDrvrAttrMax, varptr(pcchDrvrAttr))
; henv : void* in/out -> "intptr"
; fDirection : WORD -> "int"
; szDriverDesc : WORD* optional, out -> "intptr"
; cchDriverDescMax : SHORT -> "int"
; pcchDriverDesc : SHORT* optional, out -> "intptr"
; szDriverAttributes : WORD* optional, out -> "intptr"
; cchDrvrAttrMax : SHORT -> "int"
; pcchDrvrAttr : SHORT* optional, out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	odbc32 = windows.NewLazySystemDLL("ODBC32.dll")
	procSQLDriversW = odbc32.NewProc("SQLDriversW")
)

// henv (void* in/out), fDirection (WORD), szDriverDesc (WORD* optional, out), cchDriverDescMax (SHORT), pcchDriverDesc (SHORT* optional, out), szDriverAttributes (WORD* optional, out), cchDrvrAttrMax (SHORT), pcchDrvrAttr (SHORT* optional, out)
r1, _, err := procSQLDriversW.Call(
	uintptr(henv),
	uintptr(fDirection),
	uintptr(szDriverDesc),
	uintptr(cchDriverDescMax),
	uintptr(pcchDriverDesc),
	uintptr(szDriverAttributes),
	uintptr(cchDrvrAttrMax),
	uintptr(pcchDrvrAttr),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SHORT

function SQLDriversW(
  henv: Pointer;   // void* in/out
  fDirection: Word;   // WORD
  szDriverDesc: Pointer;   // WORD* optional, out
  cchDriverDescMax: Smallint;   // SHORT
  pcchDriverDesc: Pointer;   // SHORT* optional, out
  szDriverAttributes: Pointer;   // WORD* optional, out
  cchDrvrAttrMax: Smallint;   // SHORT
  pcchDrvrAttr: Pointer   // SHORT* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLDriversW';

result := DllCall("ODBC32\SQLDriversW"
    , "Ptr", henv   ; void* in/out
    , "UShort", fDirection   ; WORD
    , "Ptr", szDriverDesc   ; WORD* optional, out
    , "Short", cchDriverDescMax   ; SHORT
    , "Ptr", pcchDriverDesc   ; SHORT* optional, out
    , "Ptr", szDriverAttributes   ; WORD* optional, out
    , "Short", cchDrvrAttrMax   ; SHORT
    , "Ptr", pcchDrvrAttr   ; SHORT* optional, out
    , "Short")   ; return: SHORT

●SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr) = DLL("ODBC32.dll", "int SQLDriversW(void*, int, void*, int, void*, void*, int, void*)")
# 呼び出し: SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr)
# henv : void* in/out -> "void*"
# fDirection : WORD -> "int"
# szDriverDesc : WORD* optional, out -> "void*"
# cchDriverDescMax : SHORT -> "int"
# pcchDriverDesc : SHORT* optional, out -> "void*"
# szDriverAttributes : WORD* optional, out -> "void*"
# cchDrvrAttrMax : SHORT -> "int"
# pcchDrvrAttr : 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 SQLDriversW(
    henv: ?*anyopaque, // void* in/out
    fDirection: u16, // WORD
    szDriverDesc: [*c]u16, // WORD* optional, out
    cchDriverDescMax: i16, // SHORT
    pcchDriverDesc: [*c]i16, // SHORT* optional, out
    szDriverAttributes: [*c]u16, // WORD* optional, out
    cchDrvrAttrMax: i16, // SHORT
    pcchDrvrAttr: [*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 SQLDriversW(
    henv: pointer,  # void* in/out
    fDirection: uint16,  # WORD
    szDriverDesc: ptr uint16,  # WORD* optional, out
    cchDriverDescMax: int16,  # SHORT
    pcchDriverDesc: ptr int16,  # SHORT* optional, out
    szDriverAttributes: ptr uint16,  # WORD* optional, out
    cchDrvrAttrMax: int16,  # SHORT
    pcchDrvrAttr: ptr int16  # SHORT* optional, out
): int16 {.importc: "SQLDriversW", stdcall, dynlib: "ODBC32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "odbc32");
extern(Windows)
short SQLDriversW(
    void* henv,   // void* in/out
    ushort fDirection,   // WORD
    ushort* szDriverDesc,   // WORD* optional, out
    short cchDriverDescMax,   // SHORT
    short* pcchDriverDesc,   // SHORT* optional, out
    ushort* szDriverAttributes,   // WORD* optional, out
    short cchDrvrAttrMax,   // SHORT
    short* pcchDrvrAttr   // SHORT* optional, out
);

ccall((:SQLDriversW, "ODBC32.dll"), stdcall, Int16,
      (Ptr{Cvoid}, UInt16, Ptr{UInt16}, Int16, Ptr{Int16}, Ptr{UInt16}, Int16, Ptr{Int16}),
      henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr)
# henv : void* in/out -> Ptr{Cvoid}
# fDirection : WORD -> UInt16
# szDriverDesc : WORD* optional, out -> Ptr{UInt16}
# cchDriverDescMax : SHORT -> Int16
# pcchDriverDesc : SHORT* optional, out -> Ptr{Int16}
# szDriverAttributes : WORD* optional, out -> Ptr{UInt16}
# cchDrvrAttrMax : SHORT -> Int16
# pcchDrvrAttr : 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 SQLDriversW(
    void* henv,
    uint16_t fDirection,
    uint16_t* szDriverDesc,
    int16_t cchDriverDescMax,
    int16_t* pcchDriverDesc,
    uint16_t* szDriverAttributes,
    int16_t cchDrvrAttrMax,
    int16_t* pcchDrvrAttr);
]]
local odbc32 = ffi.load("odbc32")
-- odbc32.SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr)
-- henv : void* in/out
-- fDirection : WORD
-- szDriverDesc : WORD* optional, out
-- cchDriverDescMax : SHORT
-- pcchDriverDesc : SHORT* optional, out
-- szDriverAttributes : WORD* optional, out
-- cchDrvrAttrMax : SHORT
-- pcchDrvrAttr : 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 SQLDriversW = lib.func('__stdcall', 'SQLDriversW', 'int16_t', ['void *', 'uint16_t', 'uint16_t *', 'int16_t', 'int16_t *', 'uint16_t *', 'int16_t', 'int16_t *']);
// SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr)
// henv : void* in/out -> 'void *'
// fDirection : WORD -> 'uint16_t'
// szDriverDesc : WORD* optional, out -> 'uint16_t *'
// cchDriverDescMax : SHORT -> 'int16_t'
// pcchDriverDesc : SHORT* optional, out -> 'int16_t *'
// szDriverAttributes : WORD* optional, out -> 'uint16_t *'
// cchDrvrAttrMax : SHORT -> 'int16_t'
// pcchDrvrAttr : 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", {
  SQLDriversW: { parameters: ["pointer", "u16", "pointer", "i16", "pointer", "pointer", "i16", "pointer"], result: "i16" },
});
// lib.symbols.SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr)
// henv : void* in/out -> "pointer"
// fDirection : WORD -> "u16"
// szDriverDesc : WORD* optional, out -> "pointer"
// cchDriverDescMax : SHORT -> "i16"
// pcchDriverDesc : SHORT* optional, out -> "pointer"
// szDriverAttributes : WORD* optional, out -> "pointer"
// cchDrvrAttrMax : SHORT -> "i16"
// pcchDrvrAttr : 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 SQLDriversW(
    void* henv,
    uint16_t fDirection,
    uint16_t* szDriverDesc,
    int16_t cchDriverDescMax,
    int16_t* pcchDriverDesc,
    uint16_t* szDriverAttributes,
    int16_t cchDrvrAttrMax,
    int16_t* pcchDrvrAttr);
C, "ODBC32.dll");
// $ffi->SQLDriversW(henv, fDirection, szDriverDesc, cchDriverDescMax, pcchDriverDesc, szDriverAttributes, cchDrvrAttrMax, pcchDrvrAttr);
// henv : void* in/out
// fDirection : WORD
// szDriverDesc : WORD* optional, out
// cchDriverDescMax : SHORT
// pcchDriverDesc : SHORT* optional, out
// szDriverAttributes : WORD* optional, out
// cchDrvrAttrMax : SHORT
// pcchDrvrAttr : 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 SQLDriversW(
        Pointer henv,   // void* in/out
        short fDirection,   // WORD
        ShortByReference szDriverDesc,   // WORD* optional, out
        short cchDriverDescMax,   // SHORT
        ShortByReference pcchDriverDesc,   // SHORT* optional, out
        ShortByReference szDriverAttributes,   // WORD* optional, out
        short cchDrvrAttrMax,   // SHORT
        ShortByReference pcchDrvrAttr   // 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 SQLDriversW = SQLDriversW(
    henv : Void*,   # void* in/out
    fDirection : UInt16,   # WORD
    szDriverDesc : UInt16*,   # WORD* optional, out
    cchDriverDescMax : Int16,   # SHORT
    pcchDriverDesc : Int16*,   # SHORT* optional, out
    szDriverAttributes : UInt16*,   # WORD* optional, out
    cchDrvrAttrMax : Int16,   # SHORT
    pcchDrvrAttr : 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 SQLDriversWNative = Int16 Function(Pointer<Void>, Uint16, Pointer<Uint16>, Int16, Pointer<Int16>, Pointer<Uint16>, Int16, Pointer<Int16>);
typedef SQLDriversWDart = int Function(Pointer<Void>, int, Pointer<Uint16>, int, Pointer<Int16>, Pointer<Uint16>, int, Pointer<Int16>);
final SQLDriversW = DynamicLibrary.open('ODBC32.dll')
    .lookupFunction<SQLDriversWNative, SQLDriversWDart>('SQLDriversW');
// henv : void* in/out -> Pointer<Void>
// fDirection : WORD -> Uint16
// szDriverDesc : WORD* optional, out -> Pointer<Uint16>
// cchDriverDescMax : SHORT -> Int16
// pcchDriverDesc : SHORT* optional, out -> Pointer<Int16>
// szDriverAttributes : WORD* optional, out -> Pointer<Uint16>
// cchDrvrAttrMax : SHORT -> Int16
// pcchDrvrAttr : SHORT* optional, out -> Pointer<Int16>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SQLDriversW(
  henv: Pointer;   // void* in/out
  fDirection: Word;   // WORD
  szDriverDesc: Pointer;   // WORD* optional, out
  cchDriverDescMax: Smallint;   // SHORT
  pcchDriverDesc: Pointer;   // SHORT* optional, out
  szDriverAttributes: Pointer;   // WORD* optional, out
  cchDrvrAttrMax: Smallint;   // SHORT
  pcchDrvrAttr: Pointer   // SHORT* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLDriversW';

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

foreign import stdcall safe "SQLDriversW"
  c_SQLDriversW :: Ptr () -> Word16 -> Ptr Word16 -> Int16 -> Ptr Int16 -> Ptr Word16 -> Int16 -> Ptr Int16 -> IO Int16
-- henv : void* in/out -> Ptr ()
-- fDirection : WORD -> Word16
-- szDriverDesc : WORD* optional, out -> Ptr Word16
-- cchDriverDescMax : SHORT -> Int16
-- pcchDriverDesc : SHORT* optional, out -> Ptr Int16
-- szDriverAttributes : WORD* optional, out -> Ptr Word16
-- cchDrvrAttrMax : SHORT -> Int16
-- pcchDrvrAttr : 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 sqldriversw =
  foreign "SQLDriversW"
    ((ptr void) @-> uint16_t @-> (ptr uint16_t) @-> int16_t @-> (ptr int16_t) @-> (ptr uint16_t) @-> int16_t @-> (ptr int16_t) @-> returning int16_t)
(* henv : void* in/out -> (ptr void) *)
(* fDirection : WORD -> uint16_t *)
(* szDriverDesc : WORD* optional, out -> (ptr uint16_t) *)
(* cchDriverDescMax : SHORT -> int16_t *)
(* pcchDriverDesc : SHORT* optional, out -> (ptr int16_t) *)
(* szDriverAttributes : WORD* optional, out -> (ptr uint16_t) *)
(* cchDrvrAttrMax : SHORT -> int16_t *)
(* pcchDrvrAttr : 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 ("SQLDriversW" sqldrivers-w :convention :stdcall) :int16
  (henv :pointer)   ; void* in/out
  (f-direction :uint16)   ; WORD
  (sz-driver-desc :pointer)   ; WORD* optional, out
  (cch-driver-desc-max :int16)   ; SHORT
  (pcch-driver-desc :pointer)   ; SHORT* optional, out
  (sz-driver-attributes :pointer)   ; WORD* optional, out
  (cch-drvr-attr-max :int16)   ; SHORT
  (pcch-drvr-attr :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 $SQLDriversW = Win32::API::More->new('ODBC32',
    'short SQLDriversW(LPVOID henv, WORD fDirection, LPVOID szDriverDesc, short cchDriverDescMax, LPVOID pcchDriverDesc, LPVOID szDriverAttributes, short cchDrvrAttrMax, LPVOID pcchDrvrAttr)');
# my $ret = $SQLDriversW->Call($henv, $fDirection, $szDriverDesc, $cchDriverDescMax, $pcchDriverDesc, $szDriverAttributes, $cchDrvrAttrMax, $pcchDrvrAttr);
# henv : void* in/out -> LPVOID
# fDirection : WORD -> WORD
# szDriverDesc : WORD* optional, out -> LPVOID
# cchDriverDescMax : SHORT -> short
# pcchDriverDesc : SHORT* optional, out -> LPVOID
# szDriverAttributes : WORD* optional, out -> LPVOID
# cchDrvrAttrMax : SHORT -> short
# pcchDrvrAttr : 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。

SQLDriversW

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パラメーター

各言語での呼び出し定義

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