ucnv_detectUnicodeSignature

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

LPSTR ucnv_detectUnicodeSignature(
    LPCSTR source,
    INT sourceLength,
    INT* signatureLength,
    UErrorCode* pErrorCode
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucnv_detectUnicodeSignature(
    <MarshalAs(UnmanagedType.LPStr)> source As String,   ' LPCSTR
    sourceLength As Integer,   ' INT
    ByRef signatureLength As Integer,   ' INT* in/out
    ByRef pErrorCode As Integer   ' UErrorCode* in/out
) As IntPtr
End Function

' source : LPCSTR
' sourceLength : INT
' signatureLength : INT* in/out
' pErrorCode : UErrorCode* in/out
Declare PtrSafe Function ucnv_detectUnicodeSignature Lib "icuuc" ( _
    ByVal source As String, _
    ByVal sourceLength As Long, _
    ByRef signatureLength As Long, _
    ByRef pErrorCode As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ucnv_detectUnicodeSignature = ctypes.cdll.icuuc.ucnv_detectUnicodeSignature
ucnv_detectUnicodeSignature.restype = wintypes.LPSTR
ucnv_detectUnicodeSignature.argtypes = [
    wintypes.LPCSTR,  # source : LPCSTR
    ctypes.c_int,  # sourceLength : INT
    ctypes.POINTER(ctypes.c_int),  # signatureLength : INT* in/out
    ctypes.c_void_p,  # pErrorCode : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_detectUnicodeSignature = Fiddle::Function.new(
  lib['ucnv_detectUnicodeSignature'],
  [
    Fiddle::TYPE_VOIDP,  # source : LPCSTR
    Fiddle::TYPE_INT,  # sourceLength : INT
    Fiddle::TYPE_VOIDP,  # signatureLength : INT* in/out
    Fiddle::TYPE_VOIDP,  # pErrorCode : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_detectUnicodeSignature(
        source: *const u8,  // LPCSTR
        sourceLength: i32,  // INT
        signatureLength: *mut i32,  // INT* in/out
        pErrorCode: *mut i32  // UErrorCode* in/out
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr ucnv_detectUnicodeSignature([MarshalAs(UnmanagedType.LPStr)] string source, int sourceLength, ref int signatureLength, ref int pErrorCode);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_detectUnicodeSignature' -Namespace Win32 -PassThru
# $api::ucnv_detectUnicodeSignature(source, sourceLength, signatureLength, pErrorCode)

#uselib "icuuc.dll"
#func global ucnv_detectUnicodeSignature "ucnv_detectUnicodeSignature" sptr, sptr, sptr, sptr
; ucnv_detectUnicodeSignature source, sourceLength, varptr(signatureLength), varptr(pErrorCode)   ; 戻り値は stat
; source : LPCSTR -> "sptr"
; sourceLength : INT -> "sptr"
; signatureLength : INT* in/out -> "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。

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_detectUnicodeSignature = icuuc.NewProc("ucnv_detectUnicodeSignature")
)

// source (LPCSTR), sourceLength (INT), signatureLength (INT* in/out), pErrorCode (UErrorCode* in/out)
r1, _, err := procucnv_detectUnicodeSignature.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(source))),
	uintptr(sourceLength),
	uintptr(signatureLength),
	uintptr(pErrorCode),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function ucnv_detectUnicodeSignature(
  source: PAnsiChar;   // LPCSTR
  sourceLength: Integer;   // INT
  signatureLength: Pointer;   // INT* in/out
  pErrorCode: Pointer   // UErrorCode* in/out
): PAnsiChar; cdecl;
  external 'icuuc.dll' name 'ucnv_detectUnicodeSignature';

result := DllCall("icuuc\ucnv_detectUnicodeSignature"
    , "AStr", source   ; LPCSTR
    , "Int", sourceLength   ; INT
    , "Ptr", signatureLength   ; INT* in/out
    , "Ptr", pErrorCode   ; UErrorCode* in/out
    , "Cdecl Ptr")   ; return: LPSTR

●ucnv_detectUnicodeSignature(source, sourceLength, signatureLength, pErrorCode) = DLL("icuuc.dll", "char* ucnv_detectUnicodeSignature(char*, int, void*, void*)")
# 呼び出し: ucnv_detectUnicodeSignature(source, sourceLength, signatureLength, pErrorCode)
# source : LPCSTR -> "char*"
# sourceLength : INT -> "int"
# signatureLength : INT* in/out -> "void*"
# 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。

const std = @import("std");

extern "icuuc" fn ucnv_detectUnicodeSignature(
    source: [*c]const u8, // LPCSTR
    sourceLength: i32, // INT
    signatureLength: [*c]i32, // INT* in/out
    pErrorCode: [*c]i32 // UErrorCode* in/out
) callconv(.c) [*c]const u8;

proc ucnv_detectUnicodeSignature(
    source: cstring,  # LPCSTR
    sourceLength: int32,  # INT
    signatureLength: ptr int32,  # INT* in/out
    pErrorCode: ptr int32  # UErrorCode* in/out
): cstring {.importc: "ucnv_detectUnicodeSignature", cdecl, dynlib: "icuuc.dll".}

pragma(lib, "icuuc");
extern(C)
const(char)* ucnv_detectUnicodeSignature(
    const(char)* source,   // LPCSTR
    int sourceLength,   // INT
    int* signatureLength,   // INT* in/out
    int* pErrorCode   // UErrorCode* in/out
);

ccall((:ucnv_detectUnicodeSignature, "icuuc.dll"), Cstring,
      (Cstring, Int32, Ptr{Int32}, Ptr{Int32}),
      source, sourceLength, signatureLength, pErrorCode)
# source : LPCSTR -> Cstring
# sourceLength : INT -> Int32
# signatureLength : INT* in/out -> Ptr{Int32}
# pErrorCode : UErrorCode* in/out -> Ptr{Int32}

local ffi = require("ffi")
ffi.cdef[[
const char* ucnv_detectUnicodeSignature(
    const char* source,
    int32_t sourceLength,
    int32_t* signatureLength,
    int32_t* pErrorCode);
]]
local icuuc = ffi.load("icuuc")
-- icuuc.ucnv_detectUnicodeSignature(source, sourceLength, signatureLength, pErrorCode)
-- source : LPCSTR
-- sourceLength : INT
-- signatureLength : INT* in/out
-- pErrorCode : UErrorCode* in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('icuuc.dll');
const ucnv_detectUnicodeSignature = lib.func('__cdecl', 'ucnv_detectUnicodeSignature', 'void *', ['str', 'int32_t', 'int32_t *', 'int32_t *']);
// ucnv_detectUnicodeSignature(source, sourceLength, signatureLength, pErrorCode)
// source : LPCSTR -> 'str'
// sourceLength : INT -> 'int32_t'
// signatureLength : INT* in/out -> 'int32_t *'
// pErrorCode : UErrorCode* in/out -> 'int32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("icuuc.dll", {
  ucnv_detectUnicodeSignature: { parameters: ["buffer", "i32", "pointer", "pointer"], result: "pointer" },
});
// lib.symbols.ucnv_detectUnicodeSignature(source, sourceLength, signatureLength, pErrorCode)
// source : LPCSTR -> "buffer"
// sourceLength : INT -> "i32"
// signatureLength : INT* in/out -> "pointer"
// pErrorCode : UErrorCode* in/out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
const char* ucnv_detectUnicodeSignature(
    const char* source,
    int32_t sourceLength,
    int32_t* signatureLength,
    int32_t* pErrorCode);
C, "icuuc.dll");
// $ffi->ucnv_detectUnicodeSignature(source, sourceLength, signatureLength, pErrorCode);
// source : LPCSTR
// sourceLength : INT
// signatureLength : INT* in/out
// pErrorCode : UErrorCode* in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Icuuc extends Library {
    Icuuc INSTANCE = Native.load("icuuc", Icuuc.class);
    Pointer ucnv_detectUnicodeSignature(
        String source,   // LPCSTR
        int sourceLength,   // INT
        IntByReference signatureLength,   // INT* in/out
        IntByReference pErrorCode   // UErrorCode* in/out
    );
}

@[Link("icuuc")]
lib Libicuuc
  fun ucnv_detectUnicodeSignature = ucnv_detectUnicodeSignature(
    source : UInt8*,   # LPCSTR
    sourceLength : Int32,   # INT
    signatureLength : Int32*,   # INT* in/out
    pErrorCode : Int32*   # UErrorCode* in/out
  ) : UInt8*
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef ucnv_detectUnicodeSignatureNative = Pointer<Utf8> Function(Pointer<Utf8>, Int32, Pointer<Int32>, Pointer<Int32>);
typedef ucnv_detectUnicodeSignatureDart = Pointer<Utf8> Function(Pointer<Utf8>, int, Pointer<Int32>, Pointer<Int32>);
final ucnv_detectUnicodeSignature = DynamicLibrary.open('icuuc.dll')
    .lookupFunction<ucnv_detectUnicodeSignatureNative, ucnv_detectUnicodeSignatureDart>('ucnv_detectUnicodeSignature');
// source : LPCSTR -> Pointer<Utf8>
// sourceLength : INT -> Int32
// signatureLength : INT* in/out -> Pointer<Int32>
// pErrorCode : UErrorCode* in/out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function ucnv_detectUnicodeSignature(
  source: PAnsiChar;   // LPCSTR
  sourceLength: Integer;   // INT
  signatureLength: Pointer;   // INT* in/out
  pErrorCode: Pointer   // UErrorCode* in/out
): PAnsiChar; cdecl;
  external 'icuuc.dll' name 'ucnv_detectUnicodeSignature';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import ccall safe "ucnv_detectUnicodeSignature"
  c_ucnv_detectUnicodeSignature :: CString -> Int32 -> Ptr Int32 -> Ptr Int32 -> IO CString
-- source : LPCSTR -> CString
-- sourceLength : INT -> Int32
-- signatureLength : INT* in/out -> Ptr Int32
-- pErrorCode : UErrorCode* in/out -> Ptr Int32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let ucnv_detectunicodesignature =
  foreign "ucnv_detectUnicodeSignature"
    (string @-> int32_t @-> (ptr int32_t) @-> (ptr int32_t) @-> returning string)
(* source : LPCSTR -> string *)
(* sourceLength : INT -> int32_t *)
(* signatureLength : INT* in/out -> (ptr int32_t) *)
(* pErrorCode : UErrorCode* in/out -> (ptr int32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library icuuc (t "icuuc.dll"))
(cffi:use-foreign-library icuuc)

(cffi:defcfun ("ucnv_detectUnicodeSignature" ucnv-detect-unicode-signature :convention :cdecl) :string
  (source :string)   ; LPCSTR
  (source-length :int32)   ; INT
  (signature-length :pointer)   ; INT* in/out
  (p-error-code :pointer))   ; UErrorCode* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $ucnv_detectUnicodeSignature = Win32::API::More->new('icuuc',
    'LPSTR ucnv_detectUnicodeSignature(LPCSTR source, int sourceLength, LPVOID signatureLength, LPVOID pErrorCode)');
# my $ret = $ucnv_detectUnicodeSignature->Call($source, $sourceLength, $signatureLength, $pErrorCode);
# source : LPCSTR -> LPCSTR
# sourceLength : INT -> int
# signatureLength : INT* in/out -> LPVOID
# pErrorCode : UErrorCode* in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。