SHDeleteKeyA

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

WIN32_ERROR SHDeleteKeyA(
    HKEY hkey,
    LPCSTR pszSubKey   // optional
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SHDeleteKeyA(
    hkey As IntPtr,   ' HKEY
    <MarshalAs(UnmanagedType.LPStr)> pszSubKey As String   ' LPCSTR optional
) As UInteger
End Function

' hkey : HKEY
' pszSubKey : LPCSTR optional
Declare PtrSafe Function SHDeleteKeyA Lib "shlwapi" ( _
    ByVal hkey As LongPtr, _
    ByVal pszSubKey As String) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SHDeleteKeyA = ctypes.windll.shlwapi.SHDeleteKeyA
SHDeleteKeyA.restype = wintypes.DWORD
SHDeleteKeyA.argtypes = [
    wintypes.HANDLE,  # hkey : HKEY
    wintypes.LPCSTR,  # pszSubKey : LPCSTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
SHDeleteKeyA = Fiddle::Function.new(
  lib['SHDeleteKeyA'],
  [
    Fiddle::TYPE_VOIDP,  # hkey : HKEY
    Fiddle::TYPE_VOIDP,  # pszSubKey : LPCSTR optional
  ],
  -Fiddle::TYPE_INT)

#[link(name = "shlwapi")]
extern "system" {
    fn SHDeleteKeyA(
        hkey: *mut core::ffi::c_void,  // HKEY
        pszSubKey: *const u8  // LPCSTR optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "SHLWAPI.dll"
#func global SHDeleteKeyA "SHDeleteKeyA" sptr, sptr
; SHDeleteKeyA hkey, pszSubKey   ; 戻り値は stat
; hkey : HKEY -> "sptr"
; pszSubKey : LPCSTR optional -> "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 SHDeleteKeyA "SHDeleteKeyA" sptr, str
; res = SHDeleteKeyA(hkey, pszSubKey)
; hkey : HKEY -> "sptr"
; pszSubKey : LPCSTR optional -> "str"

; WIN32_ERROR SHDeleteKeyA(HKEY hkey, LPCSTR pszSubKey)
#uselib "SHLWAPI.dll"
#cfunc global SHDeleteKeyA "SHDeleteKeyA" intptr, str
; res = SHDeleteKeyA(hkey, pszSubKey)
; hkey : HKEY -> "intptr"
; pszSubKey : LPCSTR optional -> "str"

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHDeleteKeyA = shlwapi.NewProc("SHDeleteKeyA")
)

// hkey (HKEY), pszSubKey (LPCSTR optional)
r1, _, err := procSHDeleteKeyA.Call(
	uintptr(hkey),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszSubKey))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function SHDeleteKeyA(
  hkey: THandle;   // HKEY
  pszSubKey: PAnsiChar   // LPCSTR optional
): DWORD; stdcall;
  external 'SHLWAPI.dll' name 'SHDeleteKeyA';

result := DllCall("SHLWAPI\SHDeleteKeyA"
    , "Ptr", hkey   ; HKEY
    , "AStr", pszSubKey   ; LPCSTR optional
    , "UInt")   ; return: WIN32_ERROR

●SHDeleteKeyA(hkey, pszSubKey) = DLL("SHLWAPI.dll", "dword SHDeleteKeyA(void*, char*)")
# 呼び出し: SHDeleteKeyA(hkey, pszSubKey)
# hkey : HKEY -> "void*"
# pszSubKey : LPCSTR optional -> "char*"
# 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)。