RegSetValueA

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

WIN32_ERROR RegSetValueA(
    HKEY hKey,
    LPCSTR lpSubKey,   // optional
    REG_VALUE_TYPE dwType,
    LPCSTR lpData,   // optional
    DWORD cbData
);

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

' hKey : HKEY
' lpSubKey : LPCSTR optional
' dwType : REG_VALUE_TYPE
' lpData : LPCSTR optional
' cbData : DWORD
Declare PtrSafe Function RegSetValueA Lib "advapi32" ( _
    ByVal hKey As LongPtr, _
    ByVal lpSubKey As String, _
    ByVal dwType As Long, _
    ByVal lpData As String, _
    ByVal cbData 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

RegSetValueA = ctypes.windll.advapi32.RegSetValueA
RegSetValueA.restype = wintypes.DWORD
RegSetValueA.argtypes = [
    wintypes.HANDLE,  # hKey : HKEY
    wintypes.LPCSTR,  # lpSubKey : LPCSTR optional
    wintypes.DWORD,  # dwType : REG_VALUE_TYPE
    wintypes.LPCSTR,  # lpData : LPCSTR optional
    wintypes.DWORD,  # cbData : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
RegSetValueA = Fiddle::Function.new(
  lib['RegSetValueA'],
  [
    Fiddle::TYPE_VOIDP,  # hKey : HKEY
    Fiddle::TYPE_VOIDP,  # lpSubKey : LPCSTR optional
    -Fiddle::TYPE_INT,  # dwType : REG_VALUE_TYPE
    Fiddle::TYPE_VOIDP,  # lpData : LPCSTR optional
    -Fiddle::TYPE_INT,  # cbData : DWORD
  ],
  -Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("ADVAPI32.dll", CharSet = CharSet.Ansi)]
public static extern uint RegSetValueA(IntPtr hKey, [MarshalAs(UnmanagedType.LPStr)] string lpSubKey, uint dwType, [MarshalAs(UnmanagedType.LPStr)] string lpData, uint cbData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_RegSetValueA' -Namespace Win32 -PassThru
# $api::RegSetValueA(hKey, lpSubKey, dwType, lpData, cbData)

#uselib "ADVAPI32.dll"
#func global RegSetValueA "RegSetValueA" sptr, sptr, sptr, sptr, sptr
; RegSetValueA hKey, lpSubKey, dwType, lpData, cbData   ; 戻り値は stat
; hKey : HKEY -> "sptr"
; lpSubKey : LPCSTR optional -> "sptr"
; dwType : REG_VALUE_TYPE -> "sptr"
; lpData : LPCSTR optional -> "sptr"
; cbData : DWORD -> "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 RegSetValueA "RegSetValueA" sptr, str, int, str, int
; res = RegSetValueA(hKey, lpSubKey, dwType, lpData, cbData)
; hKey : HKEY -> "sptr"
; lpSubKey : LPCSTR optional -> "str"
; dwType : REG_VALUE_TYPE -> "int"
; lpData : LPCSTR optional -> "str"
; cbData : DWORD -> "int"

; WIN32_ERROR RegSetValueA(HKEY hKey, LPCSTR lpSubKey, REG_VALUE_TYPE dwType, LPCSTR lpData, DWORD cbData)
#uselib "ADVAPI32.dll"
#cfunc global RegSetValueA "RegSetValueA" intptr, str, int, str, int
; res = RegSetValueA(hKey, lpSubKey, dwType, lpData, cbData)
; hKey : HKEY -> "intptr"
; lpSubKey : LPCSTR optional -> "str"
; dwType : REG_VALUE_TYPE -> "int"
; lpData : LPCSTR optional -> "str"
; cbData : DWORD -> "int"

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procRegSetValueA = advapi32.NewProc("RegSetValueA")
)

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

function RegSetValueA(
  hKey: THandle;   // HKEY
  lpSubKey: PAnsiChar;   // LPCSTR optional
  dwType: DWORD;   // REG_VALUE_TYPE
  lpData: PAnsiChar;   // LPCSTR optional
  cbData: DWORD   // DWORD
): DWORD; stdcall;
  external 'ADVAPI32.dll' name 'RegSetValueA';

result := DllCall("ADVAPI32\RegSetValueA"
    , "Ptr", hKey   ; HKEY
    , "AStr", lpSubKey   ; LPCSTR optional
    , "UInt", dwType   ; REG_VALUE_TYPE
    , "AStr", lpData   ; LPCSTR optional
    , "UInt", cbData   ; DWORD
    , "UInt")   ; return: WIN32_ERROR

●RegSetValueA(hKey, lpSubKey, dwType, lpData, cbData) = DLL("ADVAPI32.dll", "dword RegSetValueA(void*, char*, dword, char*, dword)")
# 呼び出し: RegSetValueA(hKey, lpSubKey, dwType, lpData, cbData)
# hKey : HKEY -> "void*"
# lpSubKey : LPCSTR optional -> "char*"
# dwType : REG_VALUE_TYPE -> "dword"
# lpData : LPCSTR optional -> "char*"
# cbData : DWORD -> "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)。