CM_Get_Class_NameW

// CFGMGR32.dll  (Unicode / -W)
#include <windows.h>

CONFIGRET CM_Get_Class_NameW(
    GUID* ClassGuid,
    LPWSTR Buffer,   // optional
    DWORD* pulLength,
    DWORD ulFlags
);

<DllImport("CFGMGR32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function CM_Get_Class_NameW(
    ByRef ClassGuid As Guid,   ' GUID*
    <MarshalAs(UnmanagedType.LPWStr)> Buffer As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef pulLength As UInteger,   ' DWORD* in/out
    ulFlags As UInteger   ' DWORD
) As UInteger
End Function

' ClassGuid : GUID*
' Buffer : LPWSTR optional, out
' pulLength : DWORD* in/out
' ulFlags : DWORD
Declare PtrSafe Function CM_Get_Class_NameW Lib "cfgmgr32" ( _
    ByVal ClassGuid As LongPtr, _
    ByVal Buffer As LongPtr, _
    ByRef pulLength As Long, _
    ByVal ulFlags As Long) 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

CM_Get_Class_NameW = ctypes.windll.cfgmgr32.CM_Get_Class_NameW
CM_Get_Class_NameW.restype = wintypes.DWORD
CM_Get_Class_NameW.argtypes = [
    ctypes.c_void_p,  # ClassGuid : GUID*
    wintypes.LPWSTR,  # Buffer : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pulLength : DWORD* in/out
    wintypes.DWORD,  # ulFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CFGMGR32.dll')
CM_Get_Class_NameW = Fiddle::Function.new(
  lib['CM_Get_Class_NameW'],
  [
    Fiddle::TYPE_VOIDP,  # ClassGuid : GUID*
    Fiddle::TYPE_VOIDP,  # Buffer : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pulLength : DWORD* in/out
    -Fiddle::TYPE_INT,  # ulFlags : DWORD
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "cfgmgr32")]
extern "system" {
    fn CM_Get_Class_NameW(
        ClassGuid: *mut GUID,  // GUID*
        Buffer: *mut u16,  // LPWSTR optional, out
        pulLength: *mut u32,  // DWORD* in/out
        ulFlags: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("CFGMGR32.dll", CharSet = CharSet.Unicode)]
public static extern uint CM_Get_Class_NameW(ref Guid ClassGuid, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder Buffer, ref uint pulLength, uint ulFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CFGMGR32_CM_Get_Class_NameW' -Namespace Win32 -PassThru
# $api::CM_Get_Class_NameW(ClassGuid, Buffer, pulLength, ulFlags)

#uselib "CFGMGR32.dll"
#func global CM_Get_Class_NameW "CM_Get_Class_NameW" wptr, wptr, wptr, wptr
; CM_Get_Class_NameW varptr(ClassGuid), varptr(Buffer), varptr(pulLength), ulFlags   ; 戻り値は stat
; ClassGuid : GUID* -> "wptr"
; Buffer : LPWSTR optional, out -> "wptr"
; pulLength : DWORD* in/out -> "wptr"
; ulFlags : DWORD -> "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 "CFGMGR32.dll"
#cfunc global CM_Get_Class_NameW "CM_Get_Class_NameW" var, var, var, int
; res = CM_Get_Class_NameW(ClassGuid, Buffer, pulLength, ulFlags)
; ClassGuid : GUID* -> "var"
; Buffer : LPWSTR optional, out -> "var"
; pulLength : DWORD* in/out -> "var"
; ulFlags : 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。

; CONFIGRET CM_Get_Class_NameW(GUID* ClassGuid, LPWSTR Buffer, DWORD* pulLength, DWORD ulFlags)
#uselib "CFGMGR32.dll"
#cfunc global CM_Get_Class_NameW "CM_Get_Class_NameW" var, var, var, int
; res = CM_Get_Class_NameW(ClassGuid, Buffer, pulLength, ulFlags)
; ClassGuid : GUID* -> "var"
; Buffer : LPWSTR optional, out -> "var"
; pulLength : DWORD* in/out -> "var"
; ulFlags : 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 (
	cfgmgr32 = windows.NewLazySystemDLL("CFGMGR32.dll")
	procCM_Get_Class_NameW = cfgmgr32.NewProc("CM_Get_Class_NameW")
)

// ClassGuid (GUID*), Buffer (LPWSTR optional, out), pulLength (DWORD* in/out), ulFlags (DWORD)
r1, _, err := procCM_Get_Class_NameW.Call(
	uintptr(ClassGuid),
	uintptr(Buffer),
	uintptr(pulLength),
	uintptr(ulFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // CONFIGRET

function CM_Get_Class_NameW(
  ClassGuid: PGUID;   // GUID*
  Buffer: PWideChar;   // LPWSTR optional, out
  pulLength: Pointer;   // DWORD* in/out
  ulFlags: DWORD   // DWORD
): DWORD; stdcall;
  external 'CFGMGR32.dll' name 'CM_Get_Class_NameW';

result := DllCall("CFGMGR32\CM_Get_Class_NameW"
    , "Ptr", ClassGuid   ; GUID*
    , "Ptr", Buffer   ; LPWSTR optional, out
    , "Ptr", pulLength   ; DWORD* in/out
    , "UInt", ulFlags   ; DWORD
    , "UInt")   ; return: CONFIGRET

●CM_Get_Class_NameW(ClassGuid, Buffer, pulLength, ulFlags) = DLL("CFGMGR32.dll", "dword CM_Get_Class_NameW(void*, char*, void*, dword)")
# 呼び出し: CM_Get_Class_NameW(ClassGuid, Buffer, pulLength, ulFlags)
# ClassGuid : GUID* -> "void*"
# Buffer : LPWSTR optional, out -> "char*"
# pulLength : DWORD* in/out -> "void*"
# ulFlags : 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。