SHRegDeleteEmptyUSKeyA

// SHLWAPI.dll  (ANSI / -A)
#include <windows.h>

WIN32_ERROR SHRegDeleteEmptyUSKeyA(
    INT_PTR hUSKey,
    LPCSTR pszSubKey,
    SHREGDEL_FLAGS delRegFlags
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SHRegDeleteEmptyUSKeyA(
    hUSKey As IntPtr,   ' INT_PTR
    <MarshalAs(UnmanagedType.LPStr)> pszSubKey As String,   ' LPCSTR
    delRegFlags As Integer   ' SHREGDEL_FLAGS
) As UInteger
End Function

' hUSKey : INT_PTR
' pszSubKey : LPCSTR
' delRegFlags : SHREGDEL_FLAGS
Declare PtrSafe Function SHRegDeleteEmptyUSKeyA Lib "shlwapi" ( _
    ByVal hUSKey As LongPtr, _
    ByVal pszSubKey As String, _
    ByVal delRegFlags 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

SHRegDeleteEmptyUSKeyA = ctypes.windll.shlwapi.SHRegDeleteEmptyUSKeyA
SHRegDeleteEmptyUSKeyA.restype = wintypes.DWORD
SHRegDeleteEmptyUSKeyA.argtypes = [
    ctypes.c_ssize_t,  # hUSKey : INT_PTR
    wintypes.LPCSTR,  # pszSubKey : LPCSTR
    ctypes.c_int,  # delRegFlags : SHREGDEL_FLAGS
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
SHRegDeleteEmptyUSKeyA = Fiddle::Function.new(
  lib['SHRegDeleteEmptyUSKeyA'],
  [
    Fiddle::TYPE_INTPTR_T,  # hUSKey : INT_PTR
    Fiddle::TYPE_VOIDP,  # pszSubKey : LPCSTR
    Fiddle::TYPE_INT,  # delRegFlags : SHREGDEL_FLAGS
  ],
  -Fiddle::TYPE_INT)

#[link(name = "shlwapi")]
extern "system" {
    fn SHRegDeleteEmptyUSKeyA(
        hUSKey: isize,  // INT_PTR
        pszSubKey: *const u8,  // LPCSTR
        delRegFlags: i32  // SHREGDEL_FLAGS
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Ansi)]
public static extern uint SHRegDeleteEmptyUSKeyA(IntPtr hUSKey, [MarshalAs(UnmanagedType.LPStr)] string pszSubKey, int delRegFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_SHRegDeleteEmptyUSKeyA' -Namespace Win32 -PassThru
# $api::SHRegDeleteEmptyUSKeyA(hUSKey, pszSubKey, delRegFlags)

#uselib "SHLWAPI.dll"
#func global SHRegDeleteEmptyUSKeyA "SHRegDeleteEmptyUSKeyA" sptr, sptr, sptr
; SHRegDeleteEmptyUSKeyA hUSKey, pszSubKey, delRegFlags   ; 戻り値は stat
; hUSKey : INT_PTR -> "sptr"
; pszSubKey : LPCSTR -> "sptr"
; delRegFlags : SHREGDEL_FLAGS -> "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 "SHLWAPI.dll"
#cfunc global SHRegDeleteEmptyUSKeyA "SHRegDeleteEmptyUSKeyA" sptr, str, int
; res = SHRegDeleteEmptyUSKeyA(hUSKey, pszSubKey, delRegFlags)
; hUSKey : INT_PTR -> "sptr"
; pszSubKey : LPCSTR -> "str"
; delRegFlags : SHREGDEL_FLAGS -> "int"

; WIN32_ERROR SHRegDeleteEmptyUSKeyA(INT_PTR hUSKey, LPCSTR pszSubKey, SHREGDEL_FLAGS delRegFlags)
#uselib "SHLWAPI.dll"
#cfunc global SHRegDeleteEmptyUSKeyA "SHRegDeleteEmptyUSKeyA" intptr, str, int
; res = SHRegDeleteEmptyUSKeyA(hUSKey, pszSubKey, delRegFlags)
; hUSKey : INT_PTR -> "intptr"
; pszSubKey : LPCSTR -> "str"
; delRegFlags : SHREGDEL_FLAGS -> "int"

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHRegDeleteEmptyUSKeyA = shlwapi.NewProc("SHRegDeleteEmptyUSKeyA")
)

// hUSKey (INT_PTR), pszSubKey (LPCSTR), delRegFlags (SHREGDEL_FLAGS)
r1, _, err := procSHRegDeleteEmptyUSKeyA.Call(
	uintptr(hUSKey),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszSubKey))),
	uintptr(delRegFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function SHRegDeleteEmptyUSKeyA(
  hUSKey: NativeInt;   // INT_PTR
  pszSubKey: PAnsiChar;   // LPCSTR
  delRegFlags: Integer   // SHREGDEL_FLAGS
): DWORD; stdcall;
  external 'SHLWAPI.dll' name 'SHRegDeleteEmptyUSKeyA';

result := DllCall("SHLWAPI\SHRegDeleteEmptyUSKeyA"
    , "Ptr", hUSKey   ; INT_PTR
    , "AStr", pszSubKey   ; LPCSTR
    , "Int", delRegFlags   ; SHREGDEL_FLAGS
    , "UInt")   ; return: WIN32_ERROR

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