ucnv_getSubstChars

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

void ucnv_getSubstChars(
    const UConverter* converter,
    LPSTR subChars,
    CHAR* len,
    UErrorCode* err
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Sub ucnv_getSubstChars(
    ByRef converter As IntPtr,   ' UConverter*
    <MarshalAs(UnmanagedType.LPStr)> subChars As String,   ' LPSTR
    len As IntPtr,   ' CHAR* in/out
    ByRef err As Integer   ' UErrorCode* in/out
)
End Sub

' converter : UConverter*
' subChars : LPSTR
' len : CHAR* in/out
' err : UErrorCode* in/out
Declare PtrSafe Sub ucnv_getSubstChars Lib "icuuc" ( _
    ByRef converter As LongPtr, _
    ByVal subChars As String, _
    ByVal len As LongPtr, _
    ByRef err As Long)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ucnv_getSubstChars = ctypes.cdll.icuuc.ucnv_getSubstChars
ucnv_getSubstChars.restype = None
ucnv_getSubstChars.argtypes = [
    ctypes.c_void_p,  # converter : UConverter*
    wintypes.LPCSTR,  # subChars : LPSTR
    ctypes.POINTER(ctypes.c_byte),  # len : CHAR* in/out
    ctypes.c_void_p,  # err : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_getSubstChars = Fiddle::Function.new(
  lib['ucnv_getSubstChars'],
  [
    Fiddle::TYPE_VOIDP,  # converter : UConverter*
    Fiddle::TYPE_VOIDP,  # subChars : LPSTR
    Fiddle::TYPE_VOIDP,  # len : CHAR* in/out
    Fiddle::TYPE_VOIDP,  # err : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOID, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_getSubstChars(
        converter: *const isize,  // UConverter*
        subChars: *mut u8,  // LPSTR
        len: *mut i8,  // CHAR* in/out
        err: *mut i32  // UErrorCode* in/out
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void ucnv_getSubstChars(ref IntPtr converter, [MarshalAs(UnmanagedType.LPStr)] string subChars, IntPtr len, ref int err);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_getSubstChars' -Namespace Win32 -PassThru
# $api::ucnv_getSubstChars(converter, subChars, len, err)

#uselib "icuuc.dll"
#func global ucnv_getSubstChars "ucnv_getSubstChars" sptr, sptr, sptr, sptr
; ucnv_getSubstChars varptr(converter), subChars, varptr(len), varptr(err)
; converter : UConverter* -> "sptr"
; subChars : LPSTR -> "sptr"
; len : CHAR* in/out -> "sptr"
; err : UErrorCode* in/out -> "sptr"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_getSubstChars = icuuc.NewProc("ucnv_getSubstChars")
)

// converter (UConverter*), subChars (LPSTR), len (CHAR* in/out), err (UErrorCode* in/out)
r1, _, err := procucnv_getSubstChars.Call(
	uintptr(converter),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(subChars))),
	uintptr(len),
	uintptr(err),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure ucnv_getSubstChars(
  converter: Pointer;   // UConverter*
  subChars: PAnsiChar;   // LPSTR
  len: Pointer;   // CHAR* in/out
  err: Pointer   // UErrorCode* in/out
); cdecl;
  external 'icuuc.dll' name 'ucnv_getSubstChars';

result := DllCall("icuuc\ucnv_getSubstChars"
    , "Ptr", converter   ; UConverter*
    , "AStr", subChars   ; LPSTR
    , "Ptr", len   ; CHAR* in/out
    , "Ptr", err   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: void

●ucnv_getSubstChars(converter, subChars, len, err) = DLL("icuuc.dll", "int ucnv_getSubstChars(void*, char*, void*, void*)")
# 呼び出し: ucnv_getSubstChars(converter, subChars, len, err)
# converter : UConverter* -> "void*"
# subChars : LPSTR -> "char*"
# len : CHAR* in/out -> "void*"
# err : 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_getSubstChars(
    converter: [*c]isize, // UConverter*
    subChars: [*c]const u8, // LPSTR
    len: [*c]i8, // CHAR* in/out
    err: [*c]i32 // UErrorCode* in/out
) callconv(.c) void;

proc ucnv_getSubstChars(
    `converter`: ptr int,  # UConverter*
    subChars: cstring,  # LPSTR
    len: ptr int8,  # CHAR* in/out
    err: ptr int32  # UErrorCode* in/out
) {.importc: "ucnv_getSubstChars", cdecl, dynlib: "icuuc.dll".}

pragma(lib, "icuuc");
extern(C)
void ucnv_getSubstChars(
    ptrdiff_t* converter,   // UConverter*
    const(char)* subChars,   // LPSTR
    byte* len,   // CHAR* in/out
    int* err   // UErrorCode* in/out
);

ccall((:ucnv_getSubstChars, "icuuc.dll"), Cvoid,
      (Ptr{Int}, Cstring, Ptr{Int8}, Ptr{Int32}),
      converter, subChars, len, err)
# converter : UConverter* -> Ptr{Int}
# subChars : LPSTR -> Cstring
# len : CHAR* in/out -> Ptr{Int8}
# err : UErrorCode* in/out -> Ptr{Int32}

local ffi = require("ffi")
ffi.cdef[[
void ucnv_getSubstChars(
    intptr_t* converter,
    const char* subChars,
    int8_t* len,
    int32_t* err);
]]
local icuuc = ffi.load("icuuc")
-- icuuc.ucnv_getSubstChars(converter, subChars, len, err)
-- converter : UConverter*
-- subChars : LPSTR
-- len : CHAR* in/out
-- err : 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_getSubstChars = lib.func('__cdecl', 'ucnv_getSubstChars', 'void', ['intptr_t *', 'str', 'int8_t *', 'int32_t *']);
// ucnv_getSubstChars(converter, subChars, len, err)
// converter : UConverter* -> 'intptr_t *'
// subChars : LPSTR -> 'str'
// len : CHAR* in/out -> 'int8_t *'
// err : 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_getSubstChars: { parameters: ["pointer", "buffer", "pointer", "pointer"], result: "void" },
});
// lib.symbols.ucnv_getSubstChars(converter, subChars, len, err)
// converter : UConverter* -> "pointer"
// subChars : LPSTR -> "buffer"
// len : CHAR* in/out -> "pointer"
// err : 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
void ucnv_getSubstChars(
    intptr_t* converter,
    const char* subChars,
    int8_t* len,
    int32_t* err);
C, "icuuc.dll");
// $ffi->ucnv_getSubstChars(converter, subChars, len, err);
// converter : UConverter*
// subChars : LPSTR
// len : CHAR* in/out
// err : 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);
    void ucnv_getSubstChars(
        LongByReference converter,   // UConverter*
        String subChars,   // LPSTR
        byte[] len,   // CHAR* in/out
        IntByReference err   // UErrorCode* in/out
    );
}

@[Link("icuuc")]
lib Libicuuc
  fun ucnv_getSubstChars = ucnv_getSubstChars(
    converter : LibC::SSizeT*,   # UConverter*
    subChars : UInt8*,   # LPSTR
    len : Int8*,   # CHAR* in/out
    err : Int32*   # UErrorCode* in/out
  ) : Void
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_getSubstCharsNative = Void Function(Pointer<IntPtr>, Pointer<Utf8>, Pointer<Int8>, Pointer<Int32>);
typedef ucnv_getSubstCharsDart = void Function(Pointer<IntPtr>, Pointer<Utf8>, Pointer<Int8>, Pointer<Int32>);
final ucnv_getSubstChars = DynamicLibrary.open('icuuc.dll')
    .lookupFunction<ucnv_getSubstCharsNative, ucnv_getSubstCharsDart>('ucnv_getSubstChars');
// converter : UConverter* -> Pointer<IntPtr>
// subChars : LPSTR -> Pointer<Utf8>
// len : CHAR* in/out -> Pointer<Int8>
// err : UErrorCode* in/out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
procedure ucnv_getSubstChars(
  converter: Pointer;   // UConverter*
  subChars: PAnsiChar;   // LPSTR
  len: Pointer;   // CHAR* in/out
  err: Pointer   // UErrorCode* in/out
); cdecl;
  external 'icuuc.dll' name 'ucnv_getSubstChars';

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

foreign import ccall safe "ucnv_getSubstChars"
  c_ucnv_getSubstChars :: Ptr CIntPtr -> CString -> Ptr Int8 -> Ptr Int32 -> IO ()
-- converter : UConverter* -> Ptr CIntPtr
-- subChars : LPSTR -> CString
-- len : CHAR* in/out -> Ptr Int8
-- err : 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_getsubstchars =
  foreign "ucnv_getSubstChars"
    ((ptr intptr_t) @-> string @-> (ptr int8_t) @-> (ptr int32_t) @-> returning void)
(* converter : UConverter* -> (ptr intptr_t) *)
(* subChars : LPSTR -> string *)
(* len : CHAR* in/out -> (ptr int8_t) *)
(* err : 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_getSubstChars" ucnv-get-subst-chars :convention :cdecl) :void
  (converter :pointer)   ; UConverter*
  (sub-chars :string)   ; LPSTR
  (len :pointer)   ; CHAR* in/out
  (err :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_getSubstChars = Win32::API::More->new('icuuc',
    'void ucnv_getSubstChars(LPVOID converter, LPCSTR subChars, LPVOID len, LPVOID err)');
# my $ret = $ucnv_getSubstChars->Call($converter, $subChars, $len, $err);
# converter : UConverter* -> LPVOID
# subChars : LPSTR -> LPCSTR
# len : CHAR* in/out -> LPVOID
# err : 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。