GetAtomNameA

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

DWORD GetAtomNameA(
    WORD nAtom,
    LPSTR lpBuffer,
    INT nSize
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetAtomNameA(
    nAtom As UShort,   ' WORD
    <MarshalAs(UnmanagedType.LPStr)> lpBuffer As System.Text.StringBuilder,   ' LPSTR out
    nSize As Integer   ' INT
) As UInteger
End Function

' nAtom : WORD
' lpBuffer : LPSTR out
' nSize : INT
Declare PtrSafe Function GetAtomNameA Lib "kernel32" ( _
    ByVal nAtom As Integer, _
    ByVal lpBuffer As String, _
    ByVal nSize 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

GetAtomNameA = ctypes.windll.kernel32.GetAtomNameA
GetAtomNameA.restype = wintypes.DWORD
GetAtomNameA.argtypes = [
    ctypes.c_ushort,  # nAtom : WORD
    wintypes.LPSTR,  # lpBuffer : LPSTR out
    ctypes.c_int,  # nSize : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetAtomNameA = Fiddle::Function.new(
  lib['GetAtomNameA'],
  [
    -Fiddle::TYPE_SHORT,  # nAtom : WORD
    Fiddle::TYPE_VOIDP,  # lpBuffer : LPSTR out
    Fiddle::TYPE_INT,  # nSize : INT
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetAtomNameA(
        nAtom: u16,  // WORD
        lpBuffer: *mut u8,  // LPSTR out
        nSize: i32  // INT
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern uint GetAtomNameA(ushort nAtom, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpBuffer, int nSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetAtomNameA' -Namespace Win32 -PassThru
# $api::GetAtomNameA(nAtom, lpBuffer, nSize)

#uselib "KERNEL32.dll"
#func global GetAtomNameA "GetAtomNameA" sptr, sptr, sptr
; GetAtomNameA nAtom, varptr(lpBuffer), nSize   ; 戻り値は stat
; nAtom : WORD -> "sptr"
; lpBuffer : LPSTR out -> "sptr"
; nSize : INT -> "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 "KERNEL32.dll"
#cfunc global GetAtomNameA "GetAtomNameA" int, var, int
; res = GetAtomNameA(nAtom, lpBuffer, nSize)
; nAtom : WORD -> "int"
; lpBuffer : LPSTR out -> "var"
; nSize : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; DWORD GetAtomNameA(WORD nAtom, LPSTR lpBuffer, INT nSize)
#uselib "KERNEL32.dll"
#cfunc global GetAtomNameA "GetAtomNameA" int, var, int
; res = GetAtomNameA(nAtom, lpBuffer, nSize)
; nAtom : WORD -> "int"
; lpBuffer : LPSTR out -> "var"
; nSize : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetAtomNameA = kernel32.NewProc("GetAtomNameA")
)

// nAtom (WORD), lpBuffer (LPSTR out), nSize (INT)
r1, _, err := procGetAtomNameA.Call(
	uintptr(nAtom),
	uintptr(lpBuffer),
	uintptr(nSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetAtomNameA(
  nAtom: Word;   // WORD
  lpBuffer: PAnsiChar;   // LPSTR out
  nSize: Integer   // INT
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetAtomNameA';

result := DllCall("KERNEL32\GetAtomNameA"
    , "UShort", nAtom   ; WORD
    , "Ptr", lpBuffer   ; LPSTR out
    , "Int", nSize   ; INT
    , "UInt")   ; return: DWORD

●GetAtomNameA(nAtom, lpBuffer, nSize) = DLL("KERNEL32.dll", "dword GetAtomNameA(int, char*, int)")
# 呼び出し: GetAtomNameA(nAtom, lpBuffer, nSize)
# nAtom : WORD -> "int"
# lpBuffer : LPSTR out -> "char*"
# nSize : INT -> "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)。