ucnv_getAvailableName

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

LPSTR ucnv_getAvailableName(
    INT n
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucnv_getAvailableName(
    n As Integer   ' INT
) As IntPtr
End Function

' n : INT
Declare PtrSafe Function ucnv_getAvailableName Lib "icuuc" ( _
    ByVal n 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_getAvailableName = ctypes.cdll.icuuc.ucnv_getAvailableName
ucnv_getAvailableName.restype = wintypes.LPSTR
ucnv_getAvailableName.argtypes = [
    ctypes.c_int,  # n : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_getAvailableName = Fiddle::Function.new(
  lib['ucnv_getAvailableName'],
  [
    Fiddle::TYPE_INT,  # n : INT
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_getAvailableName(
        n: i32  // INT
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr ucnv_getAvailableName(int n);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_getAvailableName' -Namespace Win32 -PassThru
# $api::ucnv_getAvailableName(n)

#uselib "icuuc.dll"
#func global ucnv_getAvailableName "ucnv_getAvailableName" sptr
; ucnv_getAvailableName n   ; 戻り値は stat
; n : 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 "icuuc.dll"
#cfunc global ucnv_getAvailableName "ucnv_getAvailableName" int
; res = ucnv_getAvailableName(n)
; n : INT -> "int"

; LPSTR ucnv_getAvailableName(INT n)
#uselib "icuuc.dll"
#cfunc global ucnv_getAvailableName "ucnv_getAvailableName" int
; res = ucnv_getAvailableName(n)
; n : INT -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_getAvailableName = icuuc.NewProc("ucnv_getAvailableName")
)

// n (INT)
r1, _, err := procucnv_getAvailableName.Call(
	uintptr(n),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function ucnv_getAvailableName(
  n: Integer   // INT
): PAnsiChar; cdecl;
  external 'icuuc.dll' name 'ucnv_getAvailableName';

result := DllCall("icuuc\ucnv_getAvailableName"
    , "Int", n   ; INT
    , "Cdecl Ptr")   ; return: LPSTR

●ucnv_getAvailableName(n) = DLL("icuuc.dll", "char* ucnv_getAvailableName(int)")
# 呼び出し: ucnv_getAvailableName(n)
# n : 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)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。