GetPointerDevices

// USER32.dll
#include <windows.h>

BOOL GetPointerDevices(
    DWORD* deviceCount,
    POINTER_DEVICE_INFO* pointerDevices   // optional
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetPointerDevices(
    ByRef deviceCount As UInteger,   ' DWORD* in/out
    pointerDevices As IntPtr   ' POINTER_DEVICE_INFO* optional, out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' deviceCount : DWORD* in/out
' pointerDevices : POINTER_DEVICE_INFO* optional, out
Declare PtrSafe Function GetPointerDevices Lib "user32" ( _
    ByRef deviceCount As Long, _
    ByVal pointerDevices 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

GetPointerDevices = ctypes.windll.user32.GetPointerDevices
GetPointerDevices.restype = wintypes.BOOL
GetPointerDevices.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # deviceCount : DWORD* in/out
    ctypes.c_void_p,  # pointerDevices : POINTER_DEVICE_INFO* optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetPointerDevices = Fiddle::Function.new(
  lib['GetPointerDevices'],
  [
    Fiddle::TYPE_VOIDP,  # deviceCount : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # pointerDevices : POINTER_DEVICE_INFO* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetPointerDevices(
        deviceCount: *mut u32,  // DWORD* in/out
        pointerDevices: *mut POINTER_DEVICE_INFO  // POINTER_DEVICE_INFO* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", SetLastError = true)]
public static extern bool GetPointerDevices(ref uint deviceCount, IntPtr pointerDevices);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetPointerDevices' -Namespace Win32 -PassThru
# $api::GetPointerDevices(deviceCount, pointerDevices)

#uselib "USER32.dll"
#func global GetPointerDevices "GetPointerDevices" sptr, sptr
; GetPointerDevices varptr(deviceCount), varptr(pointerDevices)   ; 戻り値は stat
; deviceCount : DWORD* in/out -> "sptr"
; pointerDevices : POINTER_DEVICE_INFO* optional, 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。

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetPointerDevices = user32.NewProc("GetPointerDevices")
)

// deviceCount (DWORD* in/out), pointerDevices (POINTER_DEVICE_INFO* optional, out)
r1, _, err := procGetPointerDevices.Call(
	uintptr(deviceCount),
	uintptr(pointerDevices),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetPointerDevices(
  deviceCount: Pointer;   // DWORD* in/out
  pointerDevices: Pointer   // POINTER_DEVICE_INFO* optional, out
): BOOL; stdcall;
  external 'USER32.dll' name 'GetPointerDevices';

result := DllCall("USER32\GetPointerDevices"
    , "Ptr", deviceCount   ; DWORD* in/out
    , "Ptr", pointerDevices   ; POINTER_DEVICE_INFO* optional, out
    , "Int")   ; return: BOOL

●GetPointerDevices(deviceCount, pointerDevices) = DLL("USER32.dll", "bool GetPointerDevices(void*, void*)")
# 呼び出し: GetPointerDevices(deviceCount, pointerDevices)
# deviceCount : DWORD* in/out -> "void*"
# pointerDevices : POINTER_DEVICE_INFO* 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)。

const std = @import("std");

extern "user32" fn GetPointerDevices(
    deviceCount: [*c]u32, // DWORD* in/out
    pointerDevices: [*c]POINTER_DEVICE_INFO // POINTER_DEVICE_INFO* optional, out
) callconv(std.os.windows.WINAPI) i32;

proc GetPointerDevices(
    deviceCount: ptr uint32,  # DWORD* in/out
    pointerDevices: ptr POINTER_DEVICE_INFO  # POINTER_DEVICE_INFO* optional, out
): int32 {.importc: "GetPointerDevices", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
int GetPointerDevices(
    uint* deviceCount,   // DWORD* in/out
    POINTER_DEVICE_INFO* pointerDevices   // POINTER_DEVICE_INFO* optional, out
);

ccall((:GetPointerDevices, "USER32.dll"), stdcall, Int32,
      (Ptr{UInt32}, Ptr{POINTER_DEVICE_INFO}),
      deviceCount, pointerDevices)
# deviceCount : DWORD* in/out -> Ptr{UInt32}
# pointerDevices : POINTER_DEVICE_INFO* optional, out -> Ptr{POINTER_DEVICE_INFO}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t GetPointerDevices(
    uint32_t* deviceCount,
    void* pointerDevices);
]]
local user32 = ffi.load("user32")
-- user32.GetPointerDevices(deviceCount, pointerDevices)
-- deviceCount : DWORD* in/out
-- pointerDevices : POINTER_DEVICE_INFO* 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。

const koffi = require('koffi');
const lib = koffi.load('USER32.dll');
const GetPointerDevices = lib.func('__stdcall', 'GetPointerDevices', 'int32_t', ['uint32_t *', 'void *']);
// GetPointerDevices(deviceCount, pointerDevices)
// deviceCount : DWORD* in/out -> 'uint32_t *'
// pointerDevices : POINTER_DEVICE_INFO* optional, 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("USER32.dll", {
  GetPointerDevices: { parameters: ["pointer", "pointer"], result: "i32" },
});
// lib.symbols.GetPointerDevices(deviceCount, pointerDevices)
// deviceCount : DWORD* in/out -> "pointer"
// pointerDevices : POINTER_DEVICE_INFO* optional, 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 GetPointerDevices(
    uint32_t* deviceCount,
    void* pointerDevices);
C, "USER32.dll");
// $ffi->GetPointerDevices(deviceCount, pointerDevices);
// deviceCount : DWORD* in/out
// pointerDevices : POINTER_DEVICE_INFO* 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 User32 extends StdCallLibrary {
    User32 INSTANCE = Native.load("user32", User32.class);
    boolean GetPointerDevices(
        IntByReference deviceCount,   // DWORD* in/out
        Pointer pointerDevices   // POINTER_DEVICE_INFO* optional, out
    );
}

@[Link("user32")]
lib LibUSER32
  fun GetPointerDevices = GetPointerDevices(
    deviceCount : UInt32*,   # DWORD* in/out
    pointerDevices : POINTER_DEVICE_INFO*   # POINTER_DEVICE_INFO* optional, 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 GetPointerDevicesNative = Int32 Function(Pointer<Uint32>, Pointer<Void>);
typedef GetPointerDevicesDart = int Function(Pointer<Uint32>, Pointer<Void>);
final GetPointerDevices = DynamicLibrary.open('USER32.dll')
    .lookupFunction<GetPointerDevicesNative, GetPointerDevicesDart>('GetPointerDevices');
// deviceCount : DWORD* in/out -> Pointer<Uint32>
// pointerDevices : POINTER_DEVICE_INFO* optional, out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetPointerDevices(
  deviceCount: Pointer;   // DWORD* in/out
  pointerDevices: Pointer   // POINTER_DEVICE_INFO* optional, out
): BOOL; stdcall;
  external 'USER32.dll' name 'GetPointerDevices';

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

foreign import stdcall safe "GetPointerDevices"
  c_GetPointerDevices :: Ptr Word32 -> Ptr () -> IO CInt
-- deviceCount : DWORD* in/out -> Ptr Word32
-- pointerDevices : POINTER_DEVICE_INFO* optional, 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 getpointerdevices =
  foreign "GetPointerDevices"
    ((ptr uint32_t) @-> (ptr void) @-> returning int32_t)
(* deviceCount : DWORD* in/out -> (ptr uint32_t) *)
(* pointerDevices : POINTER_DEVICE_INFO* optional, 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 user32 (t "USER32.dll"))
(cffi:use-foreign-library user32)

(cffi:defcfun ("GetPointerDevices" get-pointer-devices :convention :stdcall) :int32
  (device-count :pointer)   ; DWORD* in/out
  (pointer-devices :pointer))   ; POINTER_DEVICE_INFO* optional, out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetPointerDevices = Win32::API::More->new('USER32',
    'BOOL GetPointerDevices(LPVOID deviceCount, LPVOID pointerDevices)');
# my $ret = $GetPointerDevices->Call($deviceCount, $pointerDevices);
# deviceCount : DWORD* in/out -> LPVOID
# pointerDevices : POINTER_DEVICE_INFO* 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。