ucnv_getAlias

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

LPSTR ucnv_getAlias(
    LPCSTR alias,
    WORD n,
    UErrorCode* pErrorCode
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucnv_getAlias(
    <MarshalAs(UnmanagedType.LPStr)> [alias] As String,   ' LPCSTR
    n As UShort,   ' WORD
    ByRef pErrorCode As Integer   ' UErrorCode* in/out
) As IntPtr
End Function

' alias : LPCSTR
' n : WORD
' pErrorCode : UErrorCode* in/out
Declare PtrSafe Function ucnv_getAlias Lib "icuuc" ( _
    ByVal alias As String, _
    ByVal n As Integer, _
    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_getAlias = ctypes.cdll.icuuc.ucnv_getAlias
ucnv_getAlias.restype = wintypes.LPSTR
ucnv_getAlias.argtypes = [
    wintypes.LPCSTR,  # alias : LPCSTR
    ctypes.c_ushort,  # n : WORD
    ctypes.c_void_p,  # pErrorCode : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_getAlias = Fiddle::Function.new(
  lib['ucnv_getAlias'],
  [
    Fiddle::TYPE_VOIDP,  # alias : LPCSTR
    -Fiddle::TYPE_SHORT,  # n : WORD
    Fiddle::TYPE_VOIDP,  # pErrorCode : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_getAlias(
        alias: *const u8,  // LPCSTR
        n: u16,  // WORD
        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_getAlias([MarshalAs(UnmanagedType.LPStr)] string alias, ushort n, ref int pErrorCode);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_getAlias' -Namespace Win32 -PassThru
# $api::ucnv_getAlias(alias, n, pErrorCode)

#uselib "icuuc.dll"
#func global ucnv_getAlias "ucnv_getAlias" sptr, sptr, sptr
; ucnv_getAlias alias, n, pErrorCode   ; 戻り値は stat
; alias : LPCSTR -> "sptr"
; n : WORD -> "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。

#uselib "icuuc.dll"
#cfunc global ucnv_getAlias "ucnv_getAlias" str, int, int
; res = ucnv_getAlias(alias, n, pErrorCode)
; alias : LPCSTR -> "str"
; n : WORD -> "int"
; pErrorCode : UErrorCode* in/out -> "int"

; LPSTR ucnv_getAlias(LPCSTR alias, WORD n, UErrorCode* pErrorCode)
#uselib "icuuc.dll"
#cfunc global ucnv_getAlias "ucnv_getAlias" str, int, int
; res = ucnv_getAlias(alias, n, pErrorCode)
; alias : LPCSTR -> "str"
; n : WORD -> "int"
; pErrorCode : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_getAlias = icuuc.NewProc("ucnv_getAlias")
)

// alias (LPCSTR), n (WORD), pErrorCode (UErrorCode* in/out)
r1, _, err := procucnv_getAlias.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(alias))),
	uintptr(n),
	uintptr(pErrorCode),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function ucnv_getAlias(
  alias: PAnsiChar;   // LPCSTR
  n: Word;   // WORD
  pErrorCode: Pointer   // UErrorCode* in/out
): PAnsiChar; cdecl;
  external 'icuuc.dll' name 'ucnv_getAlias';

result := DllCall("icuuc\ucnv_getAlias"
    , "AStr", alias   ; LPCSTR
    , "UShort", n   ; WORD
    , "Ptr", pErrorCode   ; UErrorCode* in/out
    , "Cdecl Ptr")   ; return: LPSTR

●ucnv_getAlias(alias, n, pErrorCode) = DLL("icuuc.dll", "char* ucnv_getAlias(char*, int, void*)")
# 呼び出し: ucnv_getAlias(alias, n, pErrorCode)
# alias : LPCSTR -> "char*"
# n : WORD -> "int"
# 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。