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DevGetObjects

関数
条件に一致するデバイスオブジェクトを同期的に取得する。
DLLapi-ms-win-devices-query-l1-1-0.dll呼出規約winapi

シグネチャ

// api-ms-win-devices-query-l1-1-0.dll
#include <windows.h>

HRESULT DevGetObjects(
    DEV_OBJECT_TYPE ObjectType,
    DWORD QueryFlags,
    DWORD cRequestedProperties,
    const DEVPROPCOMPKEY* pRequestedProperties,   // optional
    DWORD cFilterExpressionCount,
    const DEVPROP_FILTER_EXPRESSION* pFilter,   // optional
    DWORD* pcObjectCount,
    const DEV_OBJECT** ppObjects
);

パラメーター

名前型方向説明
ObjectTypeDEV_OBJECT_TYPEin問い合わせ対象のオブジェクト種別を示すDEV_OBJECT_TYPE列挙値。
QueryFlagsDWORDinクエリ動作を制御するDEVQUERYFLAGSビットフラグ。
cRequestedPropertiesDWORDin要求するプロパティ数。pRequestedProperties配列の要素数。0で非取得。
pRequestedPropertiesDEVPROPCOMPKEY*inoptional取得したいプロパティを示すDEVPROPCOMPKEY配列へのポインター。NULL可。
cFilterExpressionCountDWORDinフィルター式の数。pFilter配列の要素数。0でフィルターなし。
pFilterDEVPROP_FILTER_EXPRESSION*inoptional結果を絞り込むDEVPROP_FILTER_EXPRESSION配列へのポインター。NULL可。
pcObjectCountDWORD*out取得されたオブジェクト数を受け取るDWORDへのポインター。
ppObjectsDEV_OBJECT**out取得結果のDEV_OBJECT配列を受け取るポインター。DevFreeObjectsで解放する。

戻り値の型: HRESULT

各言語での呼び出し定義

// api-ms-win-devices-query-l1-1-0.dll
#include <windows.h>

HRESULT DevGetObjects(
    DEV_OBJECT_TYPE ObjectType,
    DWORD QueryFlags,
    DWORD cRequestedProperties,
    const DEVPROPCOMPKEY* pRequestedProperties,   // optional
    DWORD cFilterExpressionCount,
    const DEVPROP_FILTER_EXPRESSION* pFilter,   // optional
    DWORD* pcObjectCount,
    const DEV_OBJECT** ppObjects
);
[DllImport("api-ms-win-devices-query-l1-1-0.dll", ExactSpelling = true)]
static extern int DevGetObjects(
    int ObjectType,   // DEV_OBJECT_TYPE
    uint QueryFlags,   // DWORD
    uint cRequestedProperties,   // DWORD
    IntPtr pRequestedProperties,   // DEVPROPCOMPKEY* optional
    uint cFilterExpressionCount,   // DWORD
    IntPtr pFilter,   // DEVPROP_FILTER_EXPRESSION* optional
    out uint pcObjectCount,   // DWORD* out
    IntPtr ppObjects   // DEV_OBJECT** out
);
<DllImport("api-ms-win-devices-query-l1-1-0.dll", ExactSpelling:=True)>
Public Shared Function DevGetObjects(
    ObjectType As Integer,   ' DEV_OBJECT_TYPE
    QueryFlags As UInteger,   ' DWORD
    cRequestedProperties As UInteger,   ' DWORD
    pRequestedProperties As IntPtr,   ' DEVPROPCOMPKEY* optional
    cFilterExpressionCount As UInteger,   ' DWORD
    pFilter As IntPtr,   ' DEVPROP_FILTER_EXPRESSION* optional
    <Out> ByRef pcObjectCount As UInteger,   ' DWORD* out
    ppObjects As IntPtr   ' DEV_OBJECT** out
) As Integer
End Function
' ObjectType : DEV_OBJECT_TYPE
' QueryFlags : DWORD
' cRequestedProperties : DWORD
' pRequestedProperties : DEVPROPCOMPKEY* optional
' cFilterExpressionCount : DWORD
' pFilter : DEVPROP_FILTER_EXPRESSION* optional
' pcObjectCount : DWORD* out
' ppObjects : DEV_OBJECT** out
Declare PtrSafe Function DevGetObjects Lib "api-ms-win-devices-query-l1-1-0" ( _
    ByVal ObjectType As Long, _
    ByVal QueryFlags As Long, _
    ByVal cRequestedProperties As Long, _
    ByVal pRequestedProperties As LongPtr, _
    ByVal cFilterExpressionCount As Long, _
    ByVal pFilter As LongPtr, _
    ByRef pcObjectCount As Long, _
    ByVal ppObjects As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。
import ctypes
from ctypes import wintypes

DevGetObjects = ctypes.windll.LoadLibrary("api-ms-win-devices-query-l1-1-0.dll").DevGetObjects
DevGetObjects.restype = ctypes.c_int
DevGetObjects.argtypes = [
    ctypes.c_int,  # ObjectType : DEV_OBJECT_TYPE
    wintypes.DWORD,  # QueryFlags : DWORD
    wintypes.DWORD,  # cRequestedProperties : DWORD
    ctypes.c_void_p,  # pRequestedProperties : DEVPROPCOMPKEY* optional
    wintypes.DWORD,  # cFilterExpressionCount : DWORD
    ctypes.c_void_p,  # pFilter : DEVPROP_FILTER_EXPRESSION* optional
    ctypes.POINTER(wintypes.DWORD),  # pcObjectCount : DWORD* out
    ctypes.c_void_p,  # ppObjects : DEV_OBJECT** out
]
require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('api-ms-win-devices-query-l1-1-0.dll')
DevGetObjects = Fiddle::Function.new(
  lib['DevGetObjects'],
  [
    Fiddle::TYPE_INT,  # ObjectType : DEV_OBJECT_TYPE
    -Fiddle::TYPE_INT,  # QueryFlags : DWORD
    -Fiddle::TYPE_INT,  # cRequestedProperties : DWORD
    Fiddle::TYPE_VOIDP,  # pRequestedProperties : DEVPROPCOMPKEY* optional
    -Fiddle::TYPE_INT,  # cFilterExpressionCount : DWORD
    Fiddle::TYPE_VOIDP,  # pFilter : DEVPROP_FILTER_EXPRESSION* optional
    Fiddle::TYPE_VOIDP,  # pcObjectCount : DWORD* out
    Fiddle::TYPE_VOIDP,  # ppObjects : DEV_OBJECT** out
  ],
  Fiddle::TYPE_INT)
#[link(name = "api-ms-win-devices-query-l1-1-0")]
extern "system" {
    fn DevGetObjects(
        ObjectType: i32,  // DEV_OBJECT_TYPE
        QueryFlags: u32,  // DWORD
        cRequestedProperties: u32,  // DWORD
        pRequestedProperties: *const DEVPROPCOMPKEY,  // DEVPROPCOMPKEY* optional
        cFilterExpressionCount: u32,  // DWORD
        pFilter: *const DEVPROP_FILTER_EXPRESSION,  // DEVPROP_FILTER_EXPRESSION* optional
        pcObjectCount: *mut u32,  // DWORD* out
        ppObjects: *const *const DEV_OBJECT  // DEV_OBJECT** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.
$sig = @"
[DllImport("api-ms-win-devices-query-l1-1-0.dll")]
public static extern int DevGetObjects(int ObjectType, uint QueryFlags, uint cRequestedProperties, IntPtr pRequestedProperties, uint cFilterExpressionCount, IntPtr pFilter, out uint pcObjectCount, IntPtr ppObjects);
"@
$api = Add-Type -MemberDefinition $sig -Name 'api-ms-win-devices-query-l1-1-0_DevGetObjects' -Namespace Win32 -PassThru
# $api::DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects)
#uselib "api-ms-win-devices-query-l1-1-0.dll"
#func global DevGetObjects "DevGetObjects" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; DevGetObjects ObjectType, QueryFlags, cRequestedProperties, varptr(pRequestedProperties), cFilterExpressionCount, varptr(pFilter), varptr(pcObjectCount), varptr(ppObjects)   ; 戻り値は stat
; ObjectType : DEV_OBJECT_TYPE -> "sptr"
; QueryFlags : DWORD -> "sptr"
; cRequestedProperties : DWORD -> "sptr"
; pRequestedProperties : DEVPROPCOMPKEY* optional -> "sptr"
; cFilterExpressionCount : DWORD -> "sptr"
; pFilter : DEVPROP_FILTER_EXPRESSION* optional -> "sptr"
; pcObjectCount : DWORD* out -> "sptr"
; ppObjects : DEV_OBJECT** out -> "sptr"
; ※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 "api-ms-win-devices-query-l1-1-0.dll"
#cfunc global DevGetObjects "DevGetObjects" int, int, int, var, int, var, var, var
; res = DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects)
; ObjectType : DEV_OBJECT_TYPE -> "int"
; QueryFlags : DWORD -> "int"
; cRequestedProperties : DWORD -> "int"
; pRequestedProperties : DEVPROPCOMPKEY* optional -> "var"
; cFilterExpressionCount : DWORD -> "int"
; pFilter : DEVPROP_FILTER_EXPRESSION* optional -> "var"
; pcObjectCount : DWORD* out -> "var"
; ppObjects : DEV_OBJECT** 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。
出力引数: 
; HRESULT DevGetObjects(DEV_OBJECT_TYPE ObjectType, DWORD QueryFlags, DWORD cRequestedProperties, DEVPROPCOMPKEY* pRequestedProperties, DWORD cFilterExpressionCount, DEVPROP_FILTER_EXPRESSION* pFilter, DWORD* pcObjectCount, DEV_OBJECT** ppObjects)
#uselib "api-ms-win-devices-query-l1-1-0.dll"
#cfunc global DevGetObjects "DevGetObjects" int, int, int, var, int, var, var, var
; res = DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects)
; ObjectType : DEV_OBJECT_TYPE -> "int"
; QueryFlags : DWORD -> "int"
; cRequestedProperties : DWORD -> "int"
; pRequestedProperties : DEVPROPCOMPKEY* optional -> "var"
; cFilterExpressionCount : DWORD -> "int"
; pFilter : DEVPROP_FILTER_EXPRESSION* optional -> "var"
; pcObjectCount : DWORD* out -> "var"
; ppObjects : DEV_OBJECT** 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 (
	api_ms_win_devices_query_l1_1_0 = windows.NewLazySystemDLL("api-ms-win-devices-query-l1-1-0.dll")
	procDevGetObjects = api_ms_win_devices_query_l1_1_0.NewProc("DevGetObjects")
)

// ObjectType (DEV_OBJECT_TYPE), QueryFlags (DWORD), cRequestedProperties (DWORD), pRequestedProperties (DEVPROPCOMPKEY* optional), cFilterExpressionCount (DWORD), pFilter (DEVPROP_FILTER_EXPRESSION* optional), pcObjectCount (DWORD* out), ppObjects (DEV_OBJECT** out)
r1, _, err := procDevGetObjects.Call(
	uintptr(ObjectType),
	uintptr(QueryFlags),
	uintptr(cRequestedProperties),
	uintptr(pRequestedProperties),
	uintptr(cFilterExpressionCount),
	uintptr(pFilter),
	uintptr(pcObjectCount),
	uintptr(ppObjects),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT
function DevGetObjects(
  ObjectType: Integer;   // DEV_OBJECT_TYPE
  QueryFlags: DWORD;   // DWORD
  cRequestedProperties: DWORD;   // DWORD
  pRequestedProperties: Pointer;   // DEVPROPCOMPKEY* optional
  cFilterExpressionCount: DWORD;   // DWORD
  pFilter: Pointer;   // DEVPROP_FILTER_EXPRESSION* optional
  pcObjectCount: Pointer;   // DWORD* out
  ppObjects: Pointer   // DEV_OBJECT** out
): Integer; stdcall;
  external 'api-ms-win-devices-query-l1-1-0.dll' name 'DevGetObjects';
result := DllCall("api-ms-win-devices-query-l1-1-0\DevGetObjects"
    , "Int", ObjectType   ; DEV_OBJECT_TYPE
    , "UInt", QueryFlags   ; DWORD
    , "UInt", cRequestedProperties   ; DWORD
    , "Ptr", pRequestedProperties   ; DEVPROPCOMPKEY* optional
    , "UInt", cFilterExpressionCount   ; DWORD
    , "Ptr", pFilter   ; DEVPROP_FILTER_EXPRESSION* optional
    , "Ptr", pcObjectCount   ; DWORD* out
    , "Ptr", ppObjects   ; DEV_OBJECT** out
    , "Int")   ; return: HRESULT
●DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects) = DLL("api-ms-win-devices-query-l1-1-0.dll", "int DevGetObjects(int, dword, dword, void*, dword, void*, void*, void*)")
# 呼び出し: DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects)
# ObjectType : DEV_OBJECT_TYPE -> "int"
# QueryFlags : DWORD -> "dword"
# cRequestedProperties : DWORD -> "dword"
# pRequestedProperties : DEVPROPCOMPKEY* optional -> "void*"
# cFilterExpressionCount : DWORD -> "dword"
# pFilter : DEVPROP_FILTER_EXPRESSION* optional -> "void*"
# pcObjectCount : DWORD* out -> "void*"
# ppObjects : DEV_OBJECT** 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)。
const std = @import("std");

extern "api-ms-win-devices-query-l1-1-0" fn DevGetObjects(
    ObjectType: i32, // DEV_OBJECT_TYPE
    QueryFlags: u32, // DWORD
    cRequestedProperties: u32, // DWORD
    pRequestedProperties: [*c]DEVPROPCOMPKEY, // DEVPROPCOMPKEY* optional
    cFilterExpressionCount: u32, // DWORD
    pFilter: [*c]DEVPROP_FILTER_EXPRESSION, // DEVPROP_FILTER_EXPRESSION* optional
    pcObjectCount: [*c]u32, // DWORD* out
    ppObjects: [*c][*c]DEV_OBJECT // DEV_OBJECT** out
) callconv(std.os.windows.WINAPI) i32;
proc DevGetObjects(
    ObjectType: int32,  # DEV_OBJECT_TYPE
    QueryFlags: uint32,  # DWORD
    cRequestedProperties: uint32,  # DWORD
    pRequestedProperties: ptr DEVPROPCOMPKEY,  # DEVPROPCOMPKEY* optional
    cFilterExpressionCount: uint32,  # DWORD
    pFilter: ptr DEVPROP_FILTER_EXPRESSION,  # DEVPROP_FILTER_EXPRESSION* optional
    pcObjectCount: ptr uint32,  # DWORD* out
    ppObjects: ptr DEV_OBJECT  # DEV_OBJECT** out
): int32 {.importc: "DevGetObjects", stdcall, dynlib: "api-ms-win-devices-query-l1-1-0.dll".}
pragma(lib, "api-ms-win-devices-query-l1-1-0");
extern(Windows)
int DevGetObjects(
    int ObjectType,   // DEV_OBJECT_TYPE
    uint QueryFlags,   // DWORD
    uint cRequestedProperties,   // DWORD
    DEVPROPCOMPKEY* pRequestedProperties,   // DEVPROPCOMPKEY* optional
    uint cFilterExpressionCount,   // DWORD
    DEVPROP_FILTER_EXPRESSION* pFilter,   // DEVPROP_FILTER_EXPRESSION* optional
    uint* pcObjectCount,   // DWORD* out
    DEV_OBJECT** ppObjects   // DEV_OBJECT** out
);
ccall((:DevGetObjects, "api-ms-win-devices-query-l1-1-0.dll"), stdcall, Int32,
      (Int32, UInt32, UInt32, Ptr{DEVPROPCOMPKEY}, UInt32, Ptr{DEVPROP_FILTER_EXPRESSION}, Ptr{UInt32}, Ptr{DEV_OBJECT}),
      ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects)
# ObjectType : DEV_OBJECT_TYPE -> Int32
# QueryFlags : DWORD -> UInt32
# cRequestedProperties : DWORD -> UInt32
# pRequestedProperties : DEVPROPCOMPKEY* optional -> Ptr{DEVPROPCOMPKEY}
# cFilterExpressionCount : DWORD -> UInt32
# pFilter : DEVPROP_FILTER_EXPRESSION* optional -> Ptr{DEVPROP_FILTER_EXPRESSION}
# pcObjectCount : DWORD* out -> Ptr{UInt32}
# ppObjects : DEV_OBJECT** out -> Ptr{DEV_OBJECT}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
local ffi = require("ffi")
ffi.cdef[[
int32_t DevGetObjects(
    int32_t ObjectType,
    uint32_t QueryFlags,
    uint32_t cRequestedProperties,
    void* pRequestedProperties,
    uint32_t cFilterExpressionCount,
    void* pFilter,
    uint32_t* pcObjectCount,
    void* ppObjects);
]]
local api-ms-win-devices-query-l1-1-0 = ffi.load("api-ms-win-devices-query-l1-1-0")
-- api-ms-win-devices-query-l1-1-0.DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects)
-- ObjectType : DEV_OBJECT_TYPE
-- QueryFlags : DWORD
-- cRequestedProperties : DWORD
-- pRequestedProperties : DEVPROPCOMPKEY* optional
-- cFilterExpressionCount : DWORD
-- pFilter : DEVPROP_FILTER_EXPRESSION* optional
-- pcObjectCount : DWORD* out
-- ppObjects : DEV_OBJECT** 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。
const koffi = require('koffi');
const lib = koffi.load('api-ms-win-devices-query-l1-1-0.dll');
const DevGetObjects = lib.func('__stdcall', 'DevGetObjects', 'int32_t', ['int32_t', 'uint32_t', 'uint32_t', 'void *', 'uint32_t', 'void *', 'uint32_t *', 'void *']);
// DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects)
// ObjectType : DEV_OBJECT_TYPE -> 'int32_t'
// QueryFlags : DWORD -> 'uint32_t'
// cRequestedProperties : DWORD -> 'uint32_t'
// pRequestedProperties : DEVPROPCOMPKEY* optional -> 'void *'
// cFilterExpressionCount : DWORD -> 'uint32_t'
// pFilter : DEVPROP_FILTER_EXPRESSION* optional -> 'void *'
// pcObjectCount : DWORD* out -> 'uint32_t *'
// ppObjects : DEV_OBJECT** out -> 'void *'
// 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("api-ms-win-devices-query-l1-1-0.dll", {
  DevGetObjects: { parameters: ["i32", "u32", "u32", "pointer", "u32", "pointer", "pointer", "pointer"], result: "i32" },
});
// lib.symbols.DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects)
// ObjectType : DEV_OBJECT_TYPE -> "i32"
// QueryFlags : DWORD -> "u32"
// cRequestedProperties : DWORD -> "u32"
// pRequestedProperties : DEVPROPCOMPKEY* optional -> "pointer"
// cFilterExpressionCount : DWORD -> "u32"
// pFilter : DEVPROP_FILTER_EXPRESSION* optional -> "pointer"
// pcObjectCount : DWORD* out -> "pointer"
// ppObjects : DEV_OBJECT** out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。
<?php
$ffi = FFI::cdef(<<<C
int32_t DevGetObjects(
    int32_t ObjectType,
    uint32_t QueryFlags,
    uint32_t cRequestedProperties,
    void* pRequestedProperties,
    uint32_t cFilterExpressionCount,
    void* pFilter,
    uint32_t* pcObjectCount,
    void* ppObjects);
C, "api-ms-win-devices-query-l1-1-0.dll");
// $ffi->DevGetObjects(ObjectType, QueryFlags, cRequestedProperties, pRequestedProperties, cFilterExpressionCount, pFilter, pcObjectCount, ppObjects);
// ObjectType : DEV_OBJECT_TYPE
// QueryFlags : DWORD
// cRequestedProperties : DWORD
// pRequestedProperties : DEVPROPCOMPKEY* optional
// cFilterExpressionCount : DWORD
// pFilter : DEVPROP_FILTER_EXPRESSION* optional
// pcObjectCount : DWORD* out
// ppObjects : DEV_OBJECT** 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 Api-ms-win-devices-query-l1-1-0 extends StdCallLibrary {
    Api-ms-win-devices-query-l1-1-0 INSTANCE = Native.load("api-ms-win-devices-query-l1-1-0", Api-ms-win-devices-query-l1-1-0.class);
    int DevGetObjects(
        int ObjectType,   // DEV_OBJECT_TYPE
        int QueryFlags,   // DWORD
        int cRequestedProperties,   // DWORD
        Pointer pRequestedProperties,   // DEVPROPCOMPKEY* optional
        int cFilterExpressionCount,   // DWORD
        Pointer pFilter,   // DEVPROP_FILTER_EXPRESSION* optional
        IntByReference pcObjectCount,   // DWORD* out
        Pointer ppObjects   // DEV_OBJECT** out
    );
}
@[Link("api-ms-win-devices-query-l1-1-0")]
lib Libapi-ms-win-devices-query-l1-1-0
  fun DevGetObjects = DevGetObjects(
    ObjectType : Int32,   # DEV_OBJECT_TYPE
    QueryFlags : UInt32,   # DWORD
    cRequestedProperties : UInt32,   # DWORD
    pRequestedProperties : DEVPROPCOMPKEY*,   # DEVPROPCOMPKEY* optional
    cFilterExpressionCount : UInt32,   # DWORD
    pFilter : DEVPROP_FILTER_EXPRESSION*,   # DEVPROP_FILTER_EXPRESSION* optional
    pcObjectCount : UInt32*,   # DWORD* out
    ppObjects : DEV_OBJECT**   # DEV_OBJECT** out
  ) : Int32
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 DevGetObjectsNative = Int32 Function(Int32, Uint32, Uint32, Pointer<Void>, Uint32, Pointer<Void>, Pointer<Uint32>, Pointer<Void>);
typedef DevGetObjectsDart = int Function(int, int, int, Pointer<Void>, int, Pointer<Void>, Pointer<Uint32>, Pointer<Void>);
final DevGetObjects = DynamicLibrary.open('api-ms-win-devices-query-l1-1-0.dll')
    .lookupFunction<DevGetObjectsNative, DevGetObjectsDart>('DevGetObjects');
// ObjectType : DEV_OBJECT_TYPE -> Int32
// QueryFlags : DWORD -> Uint32
// cRequestedProperties : DWORD -> Uint32
// pRequestedProperties : DEVPROPCOMPKEY* optional -> Pointer<Void>
// cFilterExpressionCount : DWORD -> Uint32
// pFilter : DEVPROP_FILTER_EXPRESSION* optional -> Pointer<Void>
// pcObjectCount : DWORD* out -> Pointer<Uint32>
// ppObjects : DEV_OBJECT** out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。
{$mode objfpc}{$H+}
function DevGetObjects(
  ObjectType: Integer;   // DEV_OBJECT_TYPE
  QueryFlags: DWORD;   // DWORD
  cRequestedProperties: DWORD;   // DWORD
  pRequestedProperties: Pointer;   // DEVPROPCOMPKEY* optional
  cFilterExpressionCount: DWORD;   // DWORD
  pFilter: Pointer;   // DEVPROP_FILTER_EXPRESSION* optional
  pcObjectCount: Pointer;   // DWORD* out
  ppObjects: Pointer   // DEV_OBJECT** out
): Integer; stdcall;
  external 'api-ms-win-devices-query-l1-1-0.dll' name 'DevGetObjects';
import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "DevGetObjects"
  c_DevGetObjects :: Int32 -> Word32 -> Word32 -> Ptr () -> Word32 -> Ptr () -> Ptr Word32 -> Ptr () -> IO Int32
-- ObjectType : DEV_OBJECT_TYPE -> Int32
-- QueryFlags : DWORD -> Word32
-- cRequestedProperties : DWORD -> Word32
-- pRequestedProperties : DEVPROPCOMPKEY* optional -> Ptr ()
-- cFilterExpressionCount : DWORD -> Word32
-- pFilter : DEVPROP_FILTER_EXPRESSION* optional -> Ptr ()
-- pcObjectCount : DWORD* out -> Ptr Word32
-- ppObjects : DEV_OBJECT** out -> Ptr ()
-- 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 devgetobjects =
  foreign "DevGetObjects"
    (int32_t @-> uint32_t @-> uint32_t @-> (ptr void) @-> uint32_t @-> (ptr void) @-> (ptr uint32_t) @-> (ptr void) @-> returning int32_t)
(* ObjectType : DEV_OBJECT_TYPE -> int32_t *)
(* QueryFlags : DWORD -> uint32_t *)
(* cRequestedProperties : DWORD -> uint32_t *)
(* pRequestedProperties : DEVPROPCOMPKEY* optional -> (ptr void) *)
(* cFilterExpressionCount : DWORD -> uint32_t *)
(* pFilter : DEVPROP_FILTER_EXPRESSION* optional -> (ptr void) *)
(* pcObjectCount : DWORD* out -> (ptr uint32_t) *)
(* ppObjects : DEV_OBJECT** out -> (ptr void) *)
(* 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 api-ms-win-devices-query-l1-1-0 (t "api-ms-win-devices-query-l1-1-0.dll"))
(cffi:use-foreign-library api-ms-win-devices-query-l1-1-0)

(cffi:defcfun ("DevGetObjects" dev-get-objects :convention :stdcall) :int32
  (object-type :int32)   ; DEV_OBJECT_TYPE
  (query-flags :uint32)   ; DWORD
  (c-requested-properties :uint32)   ; DWORD
  (p-requested-properties :pointer)   ; DEVPROPCOMPKEY* optional
  (c-filter-expression-count :uint32)   ; DWORD
  (p-filter :pointer)   ; DEVPROP_FILTER_EXPRESSION* optional
  (pc-object-count :pointer)   ; DWORD* out
  (pp-objects :pointer))   ; DEV_OBJECT** out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。
use Win32::API;
my $DevGetObjects = Win32::API::More->new('api-ms-win-devices-query-l1-1-0',
    'int DevGetObjects(int ObjectType, DWORD QueryFlags, DWORD cRequestedProperties, LPVOID pRequestedProperties, DWORD cFilterExpressionCount, LPVOID pFilter, LPVOID pcObjectCount, LPVOID ppObjects)');
# my $ret = $DevGetObjects->Call($ObjectType, $QueryFlags, $cRequestedProperties, $pRequestedProperties, $cFilterExpressionCount, $pFilter, $pcObjectCount, $ppObjects);
# ObjectType : DEV_OBJECT_TYPE -> int
# QueryFlags : DWORD -> DWORD
# cRequestedProperties : DWORD -> DWORD
# pRequestedProperties : DEVPROPCOMPKEY* optional -> LPVOID
# cFilterExpressionCount : DWORD -> DWORD
# pFilter : DEVPROP_FILTER_EXPRESSION* optional -> LPVOID
# pcObjectCount : DWORD* out -> LPVOID
# ppObjects : DEV_OBJECT** out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。

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