SHRegDeleteEmptyUSKeyW

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

WIN32_ERROR SHRegDeleteEmptyUSKeyW(
    INT_PTR hUSKey,
    LPCWSTR pwzSubKey,
    SHREGDEL_FLAGS delRegFlags
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SHRegDeleteEmptyUSKeyW(
    hUSKey As IntPtr,   ' INT_PTR
    <MarshalAs(UnmanagedType.LPWStr)> pwzSubKey As String,   ' LPCWSTR
    delRegFlags As Integer   ' SHREGDEL_FLAGS
) As UInteger
End Function

' hUSKey : INT_PTR
' pwzSubKey : LPCWSTR
' delRegFlags : SHREGDEL_FLAGS
Declare PtrSafe Function SHRegDeleteEmptyUSKeyW Lib "shlwapi" ( _
    ByVal hUSKey As LongPtr, _
    ByVal pwzSubKey As LongPtr, _
    ByVal delRegFlags 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

SHRegDeleteEmptyUSKeyW = ctypes.windll.shlwapi.SHRegDeleteEmptyUSKeyW
SHRegDeleteEmptyUSKeyW.restype = wintypes.DWORD
SHRegDeleteEmptyUSKeyW.argtypes = [
    ctypes.c_ssize_t,  # hUSKey : INT_PTR
    wintypes.LPCWSTR,  # pwzSubKey : LPCWSTR
    ctypes.c_int,  # delRegFlags : SHREGDEL_FLAGS
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
SHRegDeleteEmptyUSKeyW = Fiddle::Function.new(
  lib['SHRegDeleteEmptyUSKeyW'],
  [
    Fiddle::TYPE_INTPTR_T,  # hUSKey : INT_PTR
    Fiddle::TYPE_VOIDP,  # pwzSubKey : LPCWSTR
    Fiddle::TYPE_INT,  # delRegFlags : SHREGDEL_FLAGS
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shlwapi")]
extern "system" {
    fn SHRegDeleteEmptyUSKeyW(
        hUSKey: isize,  // INT_PTR
        pwzSubKey: *const u16,  // LPCWSTR
        delRegFlags: i32  // SHREGDEL_FLAGS
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Unicode)]
public static extern uint SHRegDeleteEmptyUSKeyW(IntPtr hUSKey, [MarshalAs(UnmanagedType.LPWStr)] string pwzSubKey, int delRegFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_SHRegDeleteEmptyUSKeyW' -Namespace Win32 -PassThru
# $api::SHRegDeleteEmptyUSKeyW(hUSKey, pwzSubKey, delRegFlags)

#uselib "SHLWAPI.dll"
#func global SHRegDeleteEmptyUSKeyW "SHRegDeleteEmptyUSKeyW" wptr, wptr, wptr
; SHRegDeleteEmptyUSKeyW hUSKey, pwzSubKey, delRegFlags   ; 戻り値は stat
; hUSKey : INT_PTR -> "wptr"
; pwzSubKey : LPCWSTR -> "wptr"
; delRegFlags : SHREGDEL_FLAGS -> "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 "SHLWAPI.dll"
#cfunc global SHRegDeleteEmptyUSKeyW "SHRegDeleteEmptyUSKeyW" sptr, wstr, int
; res = SHRegDeleteEmptyUSKeyW(hUSKey, pwzSubKey, delRegFlags)
; hUSKey : INT_PTR -> "sptr"
; pwzSubKey : LPCWSTR -> "wstr"
; delRegFlags : SHREGDEL_FLAGS -> "int"

; WIN32_ERROR SHRegDeleteEmptyUSKeyW(INT_PTR hUSKey, LPCWSTR pwzSubKey, SHREGDEL_FLAGS delRegFlags)
#uselib "SHLWAPI.dll"
#cfunc global SHRegDeleteEmptyUSKeyW "SHRegDeleteEmptyUSKeyW" intptr, wstr, int
; res = SHRegDeleteEmptyUSKeyW(hUSKey, pwzSubKey, delRegFlags)
; hUSKey : INT_PTR -> "intptr"
; pwzSubKey : LPCWSTR -> "wstr"
; delRegFlags : SHREGDEL_FLAGS -> "int"

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHRegDeleteEmptyUSKeyW = shlwapi.NewProc("SHRegDeleteEmptyUSKeyW")
)

// hUSKey (INT_PTR), pwzSubKey (LPCWSTR), delRegFlags (SHREGDEL_FLAGS)
r1, _, err := procSHRegDeleteEmptyUSKeyW.Call(
	uintptr(hUSKey),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwzSubKey))),
	uintptr(delRegFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function SHRegDeleteEmptyUSKeyW(
  hUSKey: NativeInt;   // INT_PTR
  pwzSubKey: PWideChar;   // LPCWSTR
  delRegFlags: Integer   // SHREGDEL_FLAGS
): DWORD; stdcall;
  external 'SHLWAPI.dll' name 'SHRegDeleteEmptyUSKeyW';

result := DllCall("SHLWAPI\SHRegDeleteEmptyUSKeyW"
    , "Ptr", hUSKey   ; INT_PTR
    , "WStr", pwzSubKey   ; LPCWSTR
    , "Int", delRegFlags   ; SHREGDEL_FLAGS
    , "UInt")   ; return: WIN32_ERROR

●SHRegDeleteEmptyUSKeyW(hUSKey, pwzSubKey, delRegFlags) = DLL("SHLWAPI.dll", "dword SHRegDeleteEmptyUSKeyW(int, char*, int)")
# 呼び出し: SHRegDeleteEmptyUSKeyW(hUSKey, pwzSubKey, delRegFlags)
# hUSKey : INT_PTR -> "int"
# pwzSubKey : LPCWSTR -> "char*"
# delRegFlags : SHREGDEL_FLAGS -> "int"
# 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。