RegDeleteKeyExA

// ADVAPI32.dll  (ANSI / -A)
#include <windows.h>

WIN32_ERROR RegDeleteKeyExA(
    HKEY hKey,
    LPCSTR lpSubKey,
    DWORD samDesired,
    DWORD Reserved   // optional
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function RegDeleteKeyExA(
    hKey As IntPtr,   ' HKEY
    <MarshalAs(UnmanagedType.LPStr)> lpSubKey As String,   ' LPCSTR
    samDesired As UInteger,   ' DWORD
    Reserved As UInteger   ' DWORD optional
) As UInteger
End Function

' hKey : HKEY
' lpSubKey : LPCSTR
' samDesired : DWORD
' Reserved : DWORD optional
Declare PtrSafe Function RegDeleteKeyExA Lib "advapi32" ( _
    ByVal hKey As LongPtr, _
    ByVal lpSubKey As String, _
    ByVal samDesired As Long, _
    ByVal Reserved 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

RegDeleteKeyExA = ctypes.windll.advapi32.RegDeleteKeyExA
RegDeleteKeyExA.restype = wintypes.DWORD
RegDeleteKeyExA.argtypes = [
    wintypes.HANDLE,  # hKey : HKEY
    wintypes.LPCSTR,  # lpSubKey : LPCSTR
    wintypes.DWORD,  # samDesired : DWORD
    wintypes.DWORD,  # Reserved : DWORD optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
RegDeleteKeyExA = Fiddle::Function.new(
  lib['RegDeleteKeyExA'],
  [
    Fiddle::TYPE_VOIDP,  # hKey : HKEY
    Fiddle::TYPE_VOIDP,  # lpSubKey : LPCSTR
    -Fiddle::TYPE_INT,  # samDesired : DWORD
    -Fiddle::TYPE_INT,  # Reserved : DWORD optional
  ],
  -Fiddle::TYPE_INT)

#[link(name = "advapi32")]
extern "system" {
    fn RegDeleteKeyExA(
        hKey: *mut core::ffi::c_void,  // HKEY
        lpSubKey: *const u8,  // LPCSTR
        samDesired: u32,  // DWORD
        Reserved: u32  // DWORD optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ADVAPI32.dll", CharSet = CharSet.Ansi)]
public static extern uint RegDeleteKeyExA(IntPtr hKey, [MarshalAs(UnmanagedType.LPStr)] string lpSubKey, uint samDesired, uint Reserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_RegDeleteKeyExA' -Namespace Win32 -PassThru
# $api::RegDeleteKeyExA(hKey, lpSubKey, samDesired, Reserved)

#uselib "ADVAPI32.dll"
#func global RegDeleteKeyExA "RegDeleteKeyExA" sptr, sptr, sptr, sptr
; RegDeleteKeyExA hKey, lpSubKey, samDesired, Reserved   ; 戻り値は stat
; hKey : HKEY -> "sptr"
; lpSubKey : LPCSTR -> "sptr"
; samDesired : DWORD -> "sptr"
; Reserved : DWORD 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 "ADVAPI32.dll"
#cfunc global RegDeleteKeyExA "RegDeleteKeyExA" sptr, str, int, int
; res = RegDeleteKeyExA(hKey, lpSubKey, samDesired, Reserved)
; hKey : HKEY -> "sptr"
; lpSubKey : LPCSTR -> "str"
; samDesired : DWORD -> "int"
; Reserved : DWORD optional -> "int"

; WIN32_ERROR RegDeleteKeyExA(HKEY hKey, LPCSTR lpSubKey, DWORD samDesired, DWORD Reserved)
#uselib "ADVAPI32.dll"
#cfunc global RegDeleteKeyExA "RegDeleteKeyExA" intptr, str, int, int
; res = RegDeleteKeyExA(hKey, lpSubKey, samDesired, Reserved)
; hKey : HKEY -> "intptr"
; lpSubKey : LPCSTR -> "str"
; samDesired : DWORD -> "int"
; Reserved : DWORD optional -> "int"

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procRegDeleteKeyExA = advapi32.NewProc("RegDeleteKeyExA")
)

// hKey (HKEY), lpSubKey (LPCSTR), samDesired (DWORD), Reserved (DWORD optional)
r1, _, err := procRegDeleteKeyExA.Call(
	uintptr(hKey),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpSubKey))),
	uintptr(samDesired),
	uintptr(Reserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function RegDeleteKeyExA(
  hKey: THandle;   // HKEY
  lpSubKey: PAnsiChar;   // LPCSTR
  samDesired: DWORD;   // DWORD
  Reserved: DWORD   // DWORD optional
): DWORD; stdcall;
  external 'ADVAPI32.dll' name 'RegDeleteKeyExA';

result := DllCall("ADVAPI32\RegDeleteKeyExA"
    , "Ptr", hKey   ; HKEY
    , "AStr", lpSubKey   ; LPCSTR
    , "UInt", samDesired   ; DWORD
    , "UInt", Reserved   ; DWORD optional
    , "UInt")   ; return: WIN32_ERROR

●RegDeleteKeyExA(hKey, lpSubKey, samDesired, Reserved) = DLL("ADVAPI32.dll", "dword RegDeleteKeyExA(void*, char*, dword, dword)")
# 呼び出し: RegDeleteKeyExA(hKey, lpSubKey, samDesired, Reserved)
# hKey : HKEY -> "void*"
# lpSubKey : LPCSTR -> "char*"
# samDesired : DWORD -> "dword"
# Reserved : DWORD optional -> "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)。