SHDeleteValueA

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

WIN32_ERROR SHDeleteValueA(
    HKEY hkey,
    LPCSTR pszSubKey,   // optional
    LPCSTR pszValue
);

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

' hkey : HKEY
' pszSubKey : LPCSTR optional
' pszValue : LPCSTR
Declare PtrSafe Function SHDeleteValueA Lib "shlwapi" ( _
    ByVal hkey As LongPtr, _
    ByVal pszSubKey As String, _
    ByVal pszValue 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

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

require 'fiddle'
require 'fiddle/import'

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

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

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

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

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

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHDeleteValueA = shlwapi.NewProc("SHDeleteValueA")
)

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

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

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

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