SetupDiGetINFClassW

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

BOOL SetupDiGetINFClassW(
    LPCWSTR InfName,
    GUID* ClassGuid,
    LPWSTR ClassName,
    DWORD ClassNameSize,
    DWORD* RequiredSize   // optional
);

<DllImport("SETUPAPI.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetupDiGetINFClassW(
    <MarshalAs(UnmanagedType.LPWStr)> InfName As String,   ' LPCWSTR
    <Out> ByRef ClassGuid As Guid,   ' GUID* out
    <MarshalAs(UnmanagedType.LPWStr)> ClassName As System.Text.StringBuilder,   ' LPWSTR out
    ClassNameSize As UInteger,   ' DWORD
    RequiredSize As IntPtr   ' DWORD* optional, out
) As Boolean
End Function

' InfName : LPCWSTR
' ClassGuid : GUID* out
' ClassName : LPWSTR out
' ClassNameSize : DWORD
' RequiredSize : DWORD* optional, out
Declare PtrSafe Function SetupDiGetINFClassW Lib "setupapi" ( _
    ByVal InfName As LongPtr, _
    ByVal ClassGuid As LongPtr, _
    ByVal ClassName As LongPtr, _
    ByVal ClassNameSize As Long, _
    ByVal RequiredSize As LongPtr) As Long
' 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

SetupDiGetINFClassW = ctypes.windll.setupapi.SetupDiGetINFClassW
SetupDiGetINFClassW.restype = wintypes.BOOL
SetupDiGetINFClassW.argtypes = [
    wintypes.LPCWSTR,  # InfName : LPCWSTR
    ctypes.c_void_p,  # ClassGuid : GUID* out
    wintypes.LPWSTR,  # ClassName : LPWSTR out
    wintypes.DWORD,  # ClassNameSize : DWORD
    ctypes.POINTER(wintypes.DWORD),  # RequiredSize : DWORD* optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SETUPAPI.dll')
SetupDiGetINFClassW = Fiddle::Function.new(
  lib['SetupDiGetINFClassW'],
  [
    Fiddle::TYPE_VOIDP,  # InfName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # ClassGuid : GUID* out
    Fiddle::TYPE_VOIDP,  # ClassName : LPWSTR out
    -Fiddle::TYPE_INT,  # ClassNameSize : DWORD
    Fiddle::TYPE_VOIDP,  # RequiredSize : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "setupapi")]
extern "system" {
    fn SetupDiGetINFClassW(
        InfName: *const u16,  // LPCWSTR
        ClassGuid: *mut GUID,  // GUID* out
        ClassName: *mut u16,  // LPWSTR out
        ClassNameSize: u32,  // DWORD
        RequiredSize: *mut u32  // DWORD* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("SETUPAPI.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool SetupDiGetINFClassW([MarshalAs(UnmanagedType.LPWStr)] string InfName, out Guid ClassGuid, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder ClassName, uint ClassNameSize, IntPtr RequiredSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SETUPAPI_SetupDiGetINFClassW' -Namespace Win32 -PassThru
# $api::SetupDiGetINFClassW(InfName, ClassGuid, ClassName, ClassNameSize, RequiredSize)

#uselib "SETUPAPI.dll"
#func global SetupDiGetINFClassW "SetupDiGetINFClassW" wptr, wptr, wptr, wptr, wptr
; SetupDiGetINFClassW InfName, varptr(ClassGuid), varptr(ClassName), ClassNameSize, varptr(RequiredSize)   ; 戻り値は stat
; InfName : LPCWSTR -> "wptr"
; ClassGuid : GUID* out -> "wptr"
; ClassName : LPWSTR out -> "wptr"
; ClassNameSize : DWORD -> "wptr"
; RequiredSize : DWORD* 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。

#uselib "SETUPAPI.dll"
#cfunc global SetupDiGetINFClassW "SetupDiGetINFClassW" wstr, var, var, int, var
; res = SetupDiGetINFClassW(InfName, ClassGuid, ClassName, ClassNameSize, RequiredSize)
; InfName : LPCWSTR -> "wstr"
; ClassGuid : GUID* out -> "var"
; ClassName : LPWSTR out -> "var"
; ClassNameSize : DWORD -> "int"
; RequiredSize : DWORD* 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。

; BOOL SetupDiGetINFClassW(LPCWSTR InfName, GUID* ClassGuid, LPWSTR ClassName, DWORD ClassNameSize, DWORD* RequiredSize)
#uselib "SETUPAPI.dll"
#cfunc global SetupDiGetINFClassW "SetupDiGetINFClassW" wstr, var, var, int, var
; res = SetupDiGetINFClassW(InfName, ClassGuid, ClassName, ClassNameSize, RequiredSize)
; InfName : LPCWSTR -> "wstr"
; ClassGuid : GUID* out -> "var"
; ClassName : LPWSTR out -> "var"
; ClassNameSize : DWORD -> "int"
; RequiredSize : DWORD* 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。

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

var (
	setupapi = windows.NewLazySystemDLL("SETUPAPI.dll")
	procSetupDiGetINFClassW = setupapi.NewProc("SetupDiGetINFClassW")
)

// InfName (LPCWSTR), ClassGuid (GUID* out), ClassName (LPWSTR out), ClassNameSize (DWORD), RequiredSize (DWORD* optional, out)
r1, _, err := procSetupDiGetINFClassW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(InfName))),
	uintptr(ClassGuid),
	uintptr(ClassName),
	uintptr(ClassNameSize),
	uintptr(RequiredSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetupDiGetINFClassW(
  InfName: PWideChar;   // LPCWSTR
  ClassGuid: PGUID;   // GUID* out
  ClassName: PWideChar;   // LPWSTR out
  ClassNameSize: DWORD;   // DWORD
  RequiredSize: Pointer   // DWORD* optional, out
): BOOL; stdcall;
  external 'SETUPAPI.dll' name 'SetupDiGetINFClassW';

result := DllCall("SETUPAPI\SetupDiGetINFClassW"
    , "WStr", InfName   ; LPCWSTR
    , "Ptr", ClassGuid   ; GUID* out
    , "Ptr", ClassName   ; LPWSTR out
    , "UInt", ClassNameSize   ; DWORD
    , "Ptr", RequiredSize   ; DWORD* optional, out
    , "Int")   ; return: BOOL

●SetupDiGetINFClassW(InfName, ClassGuid, ClassName, ClassNameSize, RequiredSize) = DLL("SETUPAPI.dll", "bool SetupDiGetINFClassW(char*, void*, char*, dword, void*)")
# 呼び出し: SetupDiGetINFClassW(InfName, ClassGuid, ClassName, ClassNameSize, RequiredSize)
# InfName : LPCWSTR -> "char*"
# ClassGuid : GUID* out -> "void*"
# ClassName : LPWSTR out -> "char*"
# ClassNameSize : DWORD -> "dword"
# RequiredSize : DWORD* 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。