GetRegisteredRawInputDevices

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

DWORD GetRegisteredRawInputDevices(
    RAWINPUTDEVICE* pRawInputDevices,   // optional
    DWORD* puiNumDevices,
    DWORD cbSize
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetRegisteredRawInputDevices(
    pRawInputDevices As IntPtr,   ' RAWINPUTDEVICE* optional, out
    ByRef puiNumDevices As UInteger,   ' DWORD* in/out
    cbSize As UInteger   ' DWORD
) As UInteger
End Function

' pRawInputDevices : RAWINPUTDEVICE* optional, out
' puiNumDevices : DWORD* in/out
' cbSize : DWORD
Declare PtrSafe Function GetRegisteredRawInputDevices Lib "user32" ( _
    ByVal pRawInputDevices As LongPtr, _
    ByRef puiNumDevices As Long, _
    ByVal cbSize As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetRegisteredRawInputDevices = ctypes.windll.user32.GetRegisteredRawInputDevices
GetRegisteredRawInputDevices.restype = wintypes.DWORD
GetRegisteredRawInputDevices.argtypes = [
    ctypes.c_void_p,  # pRawInputDevices : RAWINPUTDEVICE* optional, out
    ctypes.POINTER(wintypes.DWORD),  # puiNumDevices : DWORD* in/out
    wintypes.DWORD,  # cbSize : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetRegisteredRawInputDevices = Fiddle::Function.new(
  lib['GetRegisteredRawInputDevices'],
  [
    Fiddle::TYPE_VOIDP,  # pRawInputDevices : RAWINPUTDEVICE* optional, out
    Fiddle::TYPE_VOIDP,  # puiNumDevices : DWORD* in/out
    -Fiddle::TYPE_INT,  # cbSize : DWORD
  ],
  -Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetRegisteredRawInputDevices(
        pRawInputDevices: *mut RAWINPUTDEVICE,  // RAWINPUTDEVICE* optional, out
        puiNumDevices: *mut u32,  // DWORD* in/out
        cbSize: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", SetLastError = true)]
public static extern uint GetRegisteredRawInputDevices(IntPtr pRawInputDevices, ref uint puiNumDevices, uint cbSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetRegisteredRawInputDevices' -Namespace Win32 -PassThru
# $api::GetRegisteredRawInputDevices(pRawInputDevices, puiNumDevices, cbSize)

#uselib "USER32.dll"
#func global GetRegisteredRawInputDevices "GetRegisteredRawInputDevices" sptr, sptr, sptr
; GetRegisteredRawInputDevices varptr(pRawInputDevices), varptr(puiNumDevices), cbSize   ; 戻り値は stat
; pRawInputDevices : RAWINPUTDEVICE* optional, out -> "sptr"
; puiNumDevices : DWORD* in/out -> "sptr"
; cbSize : DWORD -> "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。

#uselib "USER32.dll"
#cfunc global GetRegisteredRawInputDevices "GetRegisteredRawInputDevices" var, var, int
; res = GetRegisteredRawInputDevices(pRawInputDevices, puiNumDevices, cbSize)
; pRawInputDevices : RAWINPUTDEVICE* optional, out -> "var"
; puiNumDevices : DWORD* in/out -> "var"
; cbSize : 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。

; DWORD GetRegisteredRawInputDevices(RAWINPUTDEVICE* pRawInputDevices, DWORD* puiNumDevices, DWORD cbSize)
#uselib "USER32.dll"
#cfunc global GetRegisteredRawInputDevices "GetRegisteredRawInputDevices" var, var, int
; res = GetRegisteredRawInputDevices(pRawInputDevices, puiNumDevices, cbSize)
; pRawInputDevices : RAWINPUTDEVICE* optional, out -> "var"
; puiNumDevices : DWORD* in/out -> "var"
; cbSize : 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 (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetRegisteredRawInputDevices = user32.NewProc("GetRegisteredRawInputDevices")
)

// pRawInputDevices (RAWINPUTDEVICE* optional, out), puiNumDevices (DWORD* in/out), cbSize (DWORD)
r1, _, err := procGetRegisteredRawInputDevices.Call(
	uintptr(pRawInputDevices),
	uintptr(puiNumDevices),
	uintptr(cbSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetRegisteredRawInputDevices(
  pRawInputDevices: Pointer;   // RAWINPUTDEVICE* optional, out
  puiNumDevices: Pointer;   // DWORD* in/out
  cbSize: DWORD   // DWORD
): DWORD; stdcall;
  external 'USER32.dll' name 'GetRegisteredRawInputDevices';

result := DllCall("USER32\GetRegisteredRawInputDevices"
    , "Ptr", pRawInputDevices   ; RAWINPUTDEVICE* optional, out
    , "Ptr", puiNumDevices   ; DWORD* in/out
    , "UInt", cbSize   ; DWORD
    , "UInt")   ; return: DWORD

●GetRegisteredRawInputDevices(pRawInputDevices, puiNumDevices, cbSize) = DLL("USER32.dll", "dword GetRegisteredRawInputDevices(void*, void*, dword)")
# 呼び出し: GetRegisteredRawInputDevices(pRawInputDevices, puiNumDevices, cbSize)
# pRawInputDevices : RAWINPUTDEVICE* optional, out -> "void*"
# puiNumDevices : DWORD* in/out -> "void*"
# cbSize : 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)。