IdnToAscii

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

INT IdnToAscii(
    DWORD dwFlags,
    LPCWSTR lpUnicodeCharStr,
    INT cchUnicodeChar,
    LPWSTR lpASCIICharStr,   // optional
    INT cchASCIIChar
);

<DllImport("NORMALIZ.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function IdnToAscii(
    dwFlags As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpUnicodeCharStr As String,   ' LPCWSTR
    cchUnicodeChar As Integer,   ' INT
    <MarshalAs(UnmanagedType.LPWStr)> lpASCIICharStr As System.Text.StringBuilder,   ' LPWSTR optional, out
    cchASCIIChar As Integer   ' INT
) As Integer
End Function

' dwFlags : DWORD
' lpUnicodeCharStr : LPCWSTR
' cchUnicodeChar : INT
' lpASCIICharStr : LPWSTR optional, out
' cchASCIIChar : INT
Declare PtrSafe Function IdnToAscii Lib "normaliz" ( _
    ByVal dwFlags As Long, _
    ByVal lpUnicodeCharStr As LongPtr, _
    ByVal cchUnicodeChar As Long, _
    ByVal lpASCIICharStr As LongPtr, _
    ByVal cchASCIIChar 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

IdnToAscii = ctypes.windll.normaliz.IdnToAscii
IdnToAscii.restype = ctypes.c_int
IdnToAscii.argtypes = [
    wintypes.DWORD,  # dwFlags : DWORD
    wintypes.LPCWSTR,  # lpUnicodeCharStr : LPCWSTR
    ctypes.c_int,  # cchUnicodeChar : INT
    wintypes.LPWSTR,  # lpASCIICharStr : LPWSTR optional, out
    ctypes.c_int,  # cchASCIIChar : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('NORMALIZ.dll')
IdnToAscii = Fiddle::Function.new(
  lib['IdnToAscii'],
  [
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # lpUnicodeCharStr : LPCWSTR
    Fiddle::TYPE_INT,  # cchUnicodeChar : INT
    Fiddle::TYPE_VOIDP,  # lpASCIICharStr : LPWSTR optional, out
    Fiddle::TYPE_INT,  # cchASCIIChar : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "normaliz")]
extern "system" {
    fn IdnToAscii(
        dwFlags: u32,  // DWORD
        lpUnicodeCharStr: *const u16,  // LPCWSTR
        cchUnicodeChar: i32,  // INT
        lpASCIICharStr: *mut u16,  // LPWSTR optional, out
        cchASCIIChar: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("NORMALIZ.dll", SetLastError = true)]
public static extern int IdnToAscii(uint dwFlags, [MarshalAs(UnmanagedType.LPWStr)] string lpUnicodeCharStr, int cchUnicodeChar, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpASCIICharStr, int cchASCIIChar);
"@
$api = Add-Type -MemberDefinition $sig -Name 'NORMALIZ_IdnToAscii' -Namespace Win32 -PassThru
# $api::IdnToAscii(dwFlags, lpUnicodeCharStr, cchUnicodeChar, lpASCIICharStr, cchASCIIChar)

#uselib "NORMALIZ.dll"
#func global IdnToAscii "IdnToAscii" sptr, sptr, sptr, sptr, sptr
; IdnToAscii dwFlags, lpUnicodeCharStr, cchUnicodeChar, varptr(lpASCIICharStr), cchASCIIChar   ; 戻り値は stat
; dwFlags : DWORD -> "sptr"
; lpUnicodeCharStr : LPCWSTR -> "sptr"
; cchUnicodeChar : INT -> "sptr"
; lpASCIICharStr : LPWSTR optional, out -> "sptr"
; cchASCIIChar : 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 "NORMALIZ.dll"
#cfunc global IdnToAscii "IdnToAscii" int, wstr, int, var, int
; res = IdnToAscii(dwFlags, lpUnicodeCharStr, cchUnicodeChar, lpASCIICharStr, cchASCIIChar)
; dwFlags : DWORD -> "int"
; lpUnicodeCharStr : LPCWSTR -> "wstr"
; cchUnicodeChar : INT -> "int"
; lpASCIICharStr : LPWSTR optional, out -> "var"
; cchASCIIChar : 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。

; INT IdnToAscii(DWORD dwFlags, LPCWSTR lpUnicodeCharStr, INT cchUnicodeChar, LPWSTR lpASCIICharStr, INT cchASCIIChar)
#uselib "NORMALIZ.dll"
#cfunc global IdnToAscii "IdnToAscii" int, wstr, int, var, int
; res = IdnToAscii(dwFlags, lpUnicodeCharStr, cchUnicodeChar, lpASCIICharStr, cchASCIIChar)
; dwFlags : DWORD -> "int"
; lpUnicodeCharStr : LPCWSTR -> "wstr"
; cchUnicodeChar : INT -> "int"
; lpASCIICharStr : LPWSTR optional, out -> "var"
; cchASCIIChar : 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 (
	normaliz = windows.NewLazySystemDLL("NORMALIZ.dll")
	procIdnToAscii = normaliz.NewProc("IdnToAscii")
)

// dwFlags (DWORD), lpUnicodeCharStr (LPCWSTR), cchUnicodeChar (INT), lpASCIICharStr (LPWSTR optional, out), cchASCIIChar (INT)
r1, _, err := procIdnToAscii.Call(
	uintptr(dwFlags),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpUnicodeCharStr))),
	uintptr(cchUnicodeChar),
	uintptr(lpASCIICharStr),
	uintptr(cchASCIIChar),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function IdnToAscii(
  dwFlags: DWORD;   // DWORD
  lpUnicodeCharStr: PWideChar;   // LPCWSTR
  cchUnicodeChar: Integer;   // INT
  lpASCIICharStr: PWideChar;   // LPWSTR optional, out
  cchASCIIChar: Integer   // INT
): Integer; stdcall;
  external 'NORMALIZ.dll' name 'IdnToAscii';

result := DllCall("NORMALIZ\IdnToAscii"
    , "UInt", dwFlags   ; DWORD
    , "WStr", lpUnicodeCharStr   ; LPCWSTR
    , "Int", cchUnicodeChar   ; INT
    , "Ptr", lpASCIICharStr   ; LPWSTR optional, out
    , "Int", cchASCIIChar   ; INT
    , "Int")   ; return: INT

●IdnToAscii(dwFlags, lpUnicodeCharStr, cchUnicodeChar, lpASCIICharStr, cchASCIIChar) = DLL("NORMALIZ.dll", "int IdnToAscii(dword, char*, int, char*, int)")
# 呼び出し: IdnToAscii(dwFlags, lpUnicodeCharStr, cchUnicodeChar, lpASCIICharStr, cchASCIIChar)
# dwFlags : DWORD -> "dword"
# lpUnicodeCharStr : LPCWSTR -> "char*"
# cchUnicodeChar : INT -> "int"
# lpASCIICharStr : LPWSTR optional, out -> "char*"
# cchASCIIChar : 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)。