u_charName

// icuuc.dll
#include <windows.h>

INT u_charName(
    INT code,
    UCharNameChoice nameChoice,
    LPSTR buffer,
    INT bufferLength,
    UErrorCode* pErrorCode
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function u_charName(
    code As Integer,   ' INT
    nameChoice As Integer,   ' UCharNameChoice
    <MarshalAs(UnmanagedType.LPStr)> buffer As String,   ' LPSTR
    bufferLength As Integer,   ' INT
    ByRef pErrorCode As Integer   ' UErrorCode* in/out
) As Integer
End Function

' code : INT
' nameChoice : UCharNameChoice
' buffer : LPSTR
' bufferLength : INT
' pErrorCode : UErrorCode* in/out
Declare PtrSafe Function u_charName Lib "icuuc" ( _
    ByVal code As Long, _
    ByVal nameChoice As Long, _
    ByVal buffer As String, _
    ByVal bufferLength As Long, _
    ByRef pErrorCode 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

u_charName = ctypes.cdll.icuuc.u_charName
u_charName.restype = ctypes.c_int
u_charName.argtypes = [
    ctypes.c_int,  # code : INT
    ctypes.c_int,  # nameChoice : UCharNameChoice
    wintypes.LPCSTR,  # buffer : LPSTR
    ctypes.c_int,  # bufferLength : INT
    ctypes.c_void_p,  # pErrorCode : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
u_charName = Fiddle::Function.new(
  lib['u_charName'],
  [
    Fiddle::TYPE_INT,  # code : INT
    Fiddle::TYPE_INT,  # nameChoice : UCharNameChoice
    Fiddle::TYPE_VOIDP,  # buffer : LPSTR
    Fiddle::TYPE_INT,  # bufferLength : INT
    Fiddle::TYPE_VOIDP,  # pErrorCode : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn u_charName(
        code: i32,  // INT
        nameChoice: i32,  // UCharNameChoice
        buffer: *mut u8,  // LPSTR
        bufferLength: i32,  // INT
        pErrorCode: *mut i32  // UErrorCode* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int u_charName(int code, int nameChoice, [MarshalAs(UnmanagedType.LPStr)] string buffer, int bufferLength, ref int pErrorCode);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_u_charName' -Namespace Win32 -PassThru
# $api::u_charName(code, nameChoice, buffer, bufferLength, pErrorCode)

#uselib "icuuc.dll"
#func global u_charName "u_charName" sptr, sptr, sptr, sptr, sptr
; u_charName code, nameChoice, buffer, bufferLength, pErrorCode   ; 戻り値は stat
; code : INT -> "sptr"
; nameChoice : UCharNameChoice -> "sptr"
; buffer : LPSTR -> "sptr"
; bufferLength : INT -> "sptr"
; pErrorCode : UErrorCode* in/out -> "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 "icuuc.dll"
#cfunc global u_charName "u_charName" int, int, str, int, int
; res = u_charName(code, nameChoice, buffer, bufferLength, pErrorCode)
; code : INT -> "int"
; nameChoice : UCharNameChoice -> "int"
; buffer : LPSTR -> "str"
; bufferLength : INT -> "int"
; pErrorCode : UErrorCode* in/out -> "int"

; INT u_charName(INT code, UCharNameChoice nameChoice, LPSTR buffer, INT bufferLength, UErrorCode* pErrorCode)
#uselib "icuuc.dll"
#cfunc global u_charName "u_charName" int, int, str, int, int
; res = u_charName(code, nameChoice, buffer, bufferLength, pErrorCode)
; code : INT -> "int"
; nameChoice : UCharNameChoice -> "int"
; buffer : LPSTR -> "str"
; bufferLength : INT -> "int"
; pErrorCode : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procu_charName = icuuc.NewProc("u_charName")
)

// code (INT), nameChoice (UCharNameChoice), buffer (LPSTR), bufferLength (INT), pErrorCode (UErrorCode* in/out)
r1, _, err := procu_charName.Call(
	uintptr(code),
	uintptr(nameChoice),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(buffer))),
	uintptr(bufferLength),
	uintptr(pErrorCode),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function u_charName(
  code: Integer;   // INT
  nameChoice: Integer;   // UCharNameChoice
  buffer: PAnsiChar;   // LPSTR
  bufferLength: Integer;   // INT
  pErrorCode: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuuc.dll' name 'u_charName';

result := DllCall("icuuc\u_charName"
    , "Int", code   ; INT
    , "Int", nameChoice   ; UCharNameChoice
    , "AStr", buffer   ; LPSTR
    , "Int", bufferLength   ; INT
    , "Ptr", pErrorCode   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●u_charName(code, nameChoice, buffer, bufferLength, pErrorCode) = DLL("icuuc.dll", "int u_charName(int, int, char*, int, void*)")
# 呼び出し: u_charName(code, nameChoice, buffer, bufferLength, pErrorCode)
# code : INT -> "int"
# nameChoice : UCharNameChoice -> "int"
# buffer : LPSTR -> "char*"
# bufferLength : INT -> "int"
# pErrorCode : UErrorCode* in/out -> "void*"
# 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)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。