SHRegDeleteUSValueW

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

WIN32_ERROR SHRegDeleteUSValueW(
    INT_PTR hUSKey,
    LPCWSTR pwzValue,
    SHREGDEL_FLAGS delRegFlags
);

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

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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
SHRegDeleteUSValueW = Fiddle::Function.new(
  lib['SHRegDeleteUSValueW'],
  [
    Fiddle::TYPE_INTPTR_T,  # hUSKey : INT_PTR
    Fiddle::TYPE_VOIDP,  # pwzValue : 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 SHRegDeleteUSValueW(
        hUSKey: isize,  // INT_PTR
        pwzValue: *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 SHRegDeleteUSValueW(IntPtr hUSKey, [MarshalAs(UnmanagedType.LPWStr)] string pwzValue, int delRegFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_SHRegDeleteUSValueW' -Namespace Win32 -PassThru
# $api::SHRegDeleteUSValueW(hUSKey, pwzValue, delRegFlags)

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

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

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHRegDeleteUSValueW = shlwapi.NewProc("SHRegDeleteUSValueW")
)

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

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

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

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