ucnv_setFallback

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

void ucnv_setFallback(
    UConverter* cnv,
    CHAR usesFallback
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Sub ucnv_setFallback(
    ByRef cnv As IntPtr,   ' UConverter* in/out
    usesFallback As SByte   ' CHAR
)
End Sub

' cnv : UConverter* in/out
' usesFallback : CHAR
Declare PtrSafe Sub ucnv_setFallback Lib "icuuc" ( _
    ByRef cnv As LongPtr, _
    ByVal usesFallback As Byte)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ucnv_setFallback = ctypes.cdll.icuuc.ucnv_setFallback
ucnv_setFallback.restype = None
ucnv_setFallback.argtypes = [
    ctypes.c_void_p,  # cnv : UConverter* in/out
    ctypes.c_byte,  # usesFallback : CHAR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_setFallback = Fiddle::Function.new(
  lib['ucnv_setFallback'],
  [
    Fiddle::TYPE_VOIDP,  # cnv : UConverter* in/out
    Fiddle::TYPE_CHAR,  # usesFallback : CHAR
  ],
  Fiddle::TYPE_VOID, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_setFallback(
        cnv: *mut isize,  // UConverter* in/out
        usesFallback: i8  // CHAR
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void ucnv_setFallback(ref IntPtr cnv, sbyte usesFallback);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_setFallback' -Namespace Win32 -PassThru
# $api::ucnv_setFallback(cnv, usesFallback)

#uselib "icuuc.dll"
#func global ucnv_setFallback "ucnv_setFallback" sptr, sptr
; ucnv_setFallback varptr(cnv), usesFallback
; cnv : UConverter* in/out -> "sptr"
; usesFallback : CHAR -> "sptr"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_setFallback = icuuc.NewProc("ucnv_setFallback")
)

// cnv (UConverter* in/out), usesFallback (CHAR)
r1, _, err := procucnv_setFallback.Call(
	uintptr(cnv),
	uintptr(usesFallback),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure ucnv_setFallback(
  cnv: Pointer;   // UConverter* in/out
  usesFallback: Shortint   // CHAR
); cdecl;
  external 'icuuc.dll' name 'ucnv_setFallback';

result := DllCall("icuuc\ucnv_setFallback"
    , "Ptr", cnv   ; UConverter* in/out
    , "Char", usesFallback   ; CHAR
    , "Cdecl Int")   ; return: void

●ucnv_setFallback(cnv, usesFallback) = DLL("icuuc.dll", "int ucnv_setFallback(void*, char)")
# 呼び出し: ucnv_setFallback(cnv, usesFallback)
# cnv : UConverter* in/out -> "void*"
# usesFallback : CHAR -> "char"
# 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_setFallback(
    cnv: [*c]isize, // UConverter* in/out
    usesFallback: i8 // CHAR
) callconv(.c) void;

proc ucnv_setFallback(
    cnv: ptr int,  # UConverter* in/out
    usesFallback: int8  # CHAR
) {.importc: "ucnv_setFallback", cdecl, dynlib: "icuuc.dll".}

pragma(lib, "icuuc");
extern(C)
void ucnv_setFallback(
    ptrdiff_t* cnv,   // UConverter* in/out
    byte usesFallback   // CHAR
);

ccall((:ucnv_setFallback, "icuuc.dll"), Cvoid,
      (Ptr{Int}, Int8),
      cnv, usesFallback)
# cnv : UConverter* in/out -> Ptr{Int}
# usesFallback : CHAR -> Int8

local ffi = require("ffi")
ffi.cdef[[
void ucnv_setFallback(
    intptr_t* cnv,
    int8_t usesFallback);
]]
local icuuc = ffi.load("icuuc")
-- icuuc.ucnv_setFallback(cnv, usesFallback)
-- cnv : UConverter* in/out
-- usesFallback : CHAR
-- 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_setFallback = lib.func('__cdecl', 'ucnv_setFallback', 'void', ['intptr_t *', 'int8_t']);
// ucnv_setFallback(cnv, usesFallback)
// cnv : UConverter* in/out -> 'intptr_t *'
// usesFallback : CHAR -> 'int8_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_setFallback: { parameters: ["pointer", "i8"], result: "void" },
});
// lib.symbols.ucnv_setFallback(cnv, usesFallback)
// cnv : UConverter* in/out -> "pointer"
// usesFallback : CHAR -> "i8"
// 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_setFallback(
    intptr_t* cnv,
    int8_t usesFallback);
C, "icuuc.dll");
// $ffi->ucnv_setFallback(cnv, usesFallback);
// cnv : UConverter* in/out
// usesFallback : CHAR
// 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_setFallback(
        LongByReference cnv,   // UConverter* in/out
        byte usesFallback   // CHAR
    );
}

@[Link("icuuc")]
lib Libicuuc
  fun ucnv_setFallback = ucnv_setFallback(
    cnv : LibC::SSizeT*,   # UConverter* in/out
    usesFallback : Int8   # CHAR
  ) : 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_setFallbackNative = Void Function(Pointer<IntPtr>, Int8);
typedef ucnv_setFallbackDart = void Function(Pointer<IntPtr>, int);
final ucnv_setFallback = DynamicLibrary.open('icuuc.dll')
    .lookupFunction<ucnv_setFallbackNative, ucnv_setFallbackDart>('ucnv_setFallback');
// cnv : UConverter* in/out -> Pointer<IntPtr>
// usesFallback : CHAR -> Int8
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
procedure ucnv_setFallback(
  cnv: Pointer;   // UConverter* in/out
  usesFallback: Shortint   // CHAR
); cdecl;
  external 'icuuc.dll' name 'ucnv_setFallback';

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

foreign import ccall safe "ucnv_setFallback"
  c_ucnv_setFallback :: Ptr CIntPtr -> Int8 -> IO ()
-- cnv : UConverter* in/out -> Ptr CIntPtr
-- usesFallback : CHAR -> Int8
-- 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_setfallback =
  foreign "ucnv_setFallback"
    ((ptr intptr_t) @-> int8_t @-> returning void)
(* cnv : UConverter* in/out -> (ptr intptr_t) *)
(* usesFallback : CHAR -> int8_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_setFallback" ucnv-set-fallback :convention :cdecl) :void
  (cnv :pointer)   ; UConverter* in/out
  (uses-fallback :int8))   ; CHAR
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $ucnv_setFallback = Win32::API::More->new('icuuc',
    'void ucnv_setFallback(LPVOID cnv, char usesFallback)');
# my $ret = $ucnv_setFallback->Call($cnv, $usesFallback);
# cnv : UConverter* in/out -> LPVOID
# usesFallback : CHAR -> char
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。