ucnvsel_selectForUTF8

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

UEnumeration* ucnvsel_selectForUTF8(
    const UConverterSelector* sel,
    LPCSTR s,
    INT length,
    UErrorCode* status
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucnvsel_selectForUTF8(
    ByRef sel As IntPtr,   ' UConverterSelector*
    <MarshalAs(UnmanagedType.LPStr)> s As String,   ' LPCSTR
    length As Integer,   ' INT
    ByRef status As Integer   ' UErrorCode* in/out
) As IntPtr
End Function

' sel : UConverterSelector*
' s : LPCSTR
' length : INT
' status : UErrorCode* in/out
Declare PtrSafe Function ucnvsel_selectForUTF8 Lib "icuuc" ( _
    ByRef sel As LongPtr, _
    ByVal s As String, _
    ByVal length As Long, _
    ByRef status 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

ucnvsel_selectForUTF8 = ctypes.cdll.icuuc.ucnvsel_selectForUTF8
ucnvsel_selectForUTF8.restype = ctypes.c_void_p
ucnvsel_selectForUTF8.argtypes = [
    ctypes.c_void_p,  # sel : UConverterSelector*
    wintypes.LPCSTR,  # s : LPCSTR
    ctypes.c_int,  # length : INT
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnvsel_selectForUTF8 = Fiddle::Function.new(
  lib['ucnvsel_selectForUTF8'],
  [
    Fiddle::TYPE_VOIDP,  # sel : UConverterSelector*
    Fiddle::TYPE_VOIDP,  # s : LPCSTR
    Fiddle::TYPE_INT,  # length : INT
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnvsel_selectForUTF8(
        sel: *const isize,  // UConverterSelector*
        s: *const u8,  // LPCSTR
        length: i32,  // INT
        status: *mut i32  // UErrorCode* in/out
    ) -> *mut isize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr ucnvsel_selectForUTF8(ref IntPtr sel, [MarshalAs(UnmanagedType.LPStr)] string s, int length, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnvsel_selectForUTF8' -Namespace Win32 -PassThru
# $api::ucnvsel_selectForUTF8(sel, s, length, status)

#uselib "icuuc.dll"
#func global ucnvsel_selectForUTF8 "ucnvsel_selectForUTF8" sptr, sptr, sptr, sptr
; ucnvsel_selectForUTF8 sel, s, length, status   ; 戻り値は stat
; sel : UConverterSelector* -> "sptr"
; s : LPCSTR -> "sptr"
; length : INT -> "sptr"
; status : 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 ucnvsel_selectForUTF8 "ucnvsel_selectForUTF8" int, str, int, int
; res = ucnvsel_selectForUTF8(sel, s, length, status)
; sel : UConverterSelector* -> "int"
; s : LPCSTR -> "str"
; length : INT -> "int"
; status : UErrorCode* in/out -> "int"

; UEnumeration* ucnvsel_selectForUTF8(UConverterSelector* sel, LPCSTR s, INT length, UErrorCode* status)
#uselib "icuuc.dll"
#cfunc global ucnvsel_selectForUTF8 "ucnvsel_selectForUTF8" int, str, int, int
; res = ucnvsel_selectForUTF8(sel, s, length, status)
; sel : UConverterSelector* -> "int"
; s : LPCSTR -> "str"
; length : INT -> "int"
; status : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnvsel_selectForUTF8 = icuuc.NewProc("ucnvsel_selectForUTF8")
)

// sel (UConverterSelector*), s (LPCSTR), length (INT), status (UErrorCode* in/out)
r1, _, err := procucnvsel_selectForUTF8.Call(
	uintptr(sel),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(s))),
	uintptr(length),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // UEnumeration*

function ucnvsel_selectForUTF8(
  sel: Pointer;   // UConverterSelector*
  s: PAnsiChar;   // LPCSTR
  length: Integer;   // INT
  status: Pointer   // UErrorCode* in/out
): Pointer; cdecl;
  external 'icuuc.dll' name 'ucnvsel_selectForUTF8';

result := DllCall("icuuc\ucnvsel_selectForUTF8"
    , "Ptr", sel   ; UConverterSelector*
    , "AStr", s   ; LPCSTR
    , "Int", length   ; INT
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Ptr")   ; return: UEnumeration*

●ucnvsel_selectForUTF8(sel, s, length, status) = DLL("icuuc.dll", "void* ucnvsel_selectForUTF8(void*, char*, int, void*)")
# 呼び出し: ucnvsel_selectForUTF8(sel, s, length, status)
# sel : UConverterSelector* -> "void*"
# s : LPCSTR -> "char*"
# length : INT -> "int"
# status : 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。