uloc_getDisplayCountry

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

INT uloc_getDisplayCountry(
    LPCSTR locale,
    LPCSTR displayLocale,
    WORD* country,
    INT countryCapacity,
    UErrorCode* status
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function uloc_getDisplayCountry(
    <MarshalAs(UnmanagedType.LPStr)> locale As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> displayLocale As String,   ' LPCSTR
    ByRef country As UShort,   ' WORD* in/out
    countryCapacity As Integer,   ' INT
    ByRef status As Integer   ' UErrorCode* in/out
) As Integer
End Function

' locale : LPCSTR
' displayLocale : LPCSTR
' country : WORD* in/out
' countryCapacity : INT
' status : UErrorCode* in/out
Declare PtrSafe Function uloc_getDisplayCountry Lib "icuuc" ( _
    ByVal locale As String, _
    ByVal displayLocale As String, _
    ByRef country As Integer, _
    ByVal countryCapacity As Long, _
    ByRef status As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

uloc_getDisplayCountry = ctypes.cdll.icuuc.uloc_getDisplayCountry
uloc_getDisplayCountry.restype = ctypes.c_int
uloc_getDisplayCountry.argtypes = [
    wintypes.LPCSTR,  # locale : LPCSTR
    wintypes.LPCSTR,  # displayLocale : LPCSTR
    ctypes.POINTER(ctypes.c_ushort),  # country : WORD* in/out
    ctypes.c_int,  # countryCapacity : INT
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
uloc_getDisplayCountry = Fiddle::Function.new(
  lib['uloc_getDisplayCountry'],
  [
    Fiddle::TYPE_VOIDP,  # locale : LPCSTR
    Fiddle::TYPE_VOIDP,  # displayLocale : LPCSTR
    Fiddle::TYPE_VOIDP,  # country : WORD* in/out
    Fiddle::TYPE_INT,  # countryCapacity : INT
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn uloc_getDisplayCountry(
        locale: *const u8,  // LPCSTR
        displayLocale: *const u8,  // LPCSTR
        country: *mut u16,  // WORD* in/out
        countryCapacity: i32,  // INT
        status: *mut i32  // UErrorCode* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int uloc_getDisplayCountry([MarshalAs(UnmanagedType.LPStr)] string locale, [MarshalAs(UnmanagedType.LPStr)] string displayLocale, ref ushort country, int countryCapacity, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_uloc_getDisplayCountry' -Namespace Win32 -PassThru
# $api::uloc_getDisplayCountry(locale, displayLocale, country, countryCapacity, status)

#uselib "icuuc.dll"
#func global uloc_getDisplayCountry "uloc_getDisplayCountry" sptr, sptr, sptr, sptr, sptr
; uloc_getDisplayCountry locale, displayLocale, varptr(country), countryCapacity, status   ; 戻り値は stat
; locale : LPCSTR -> "sptr"
; displayLocale : LPCSTR -> "sptr"
; country : WORD* in/out -> "sptr"
; countryCapacity : 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 uloc_getDisplayCountry "uloc_getDisplayCountry" str, str, var, int, int
; res = uloc_getDisplayCountry(locale, displayLocale, country, countryCapacity, status)
; locale : LPCSTR -> "str"
; displayLocale : LPCSTR -> "str"
; country : WORD* in/out -> "var"
; countryCapacity : INT -> "int"
; status : UErrorCode* in/out -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; INT uloc_getDisplayCountry(LPCSTR locale, LPCSTR displayLocale, WORD* country, INT countryCapacity, UErrorCode* status)
#uselib "icuuc.dll"
#cfunc global uloc_getDisplayCountry "uloc_getDisplayCountry" str, str, var, int, int
; res = uloc_getDisplayCountry(locale, displayLocale, country, countryCapacity, status)
; locale : LPCSTR -> "str"
; displayLocale : LPCSTR -> "str"
; country : WORD* in/out -> "var"
; countryCapacity : INT -> "int"
; status : UErrorCode* in/out -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	proculoc_getDisplayCountry = icuuc.NewProc("uloc_getDisplayCountry")
)

// locale (LPCSTR), displayLocale (LPCSTR), country (WORD* in/out), countryCapacity (INT), status (UErrorCode* in/out)
r1, _, err := proculoc_getDisplayCountry.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(locale))),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(displayLocale))),
	uintptr(country),
	uintptr(countryCapacity),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function uloc_getDisplayCountry(
  locale: PAnsiChar;   // LPCSTR
  displayLocale: PAnsiChar;   // LPCSTR
  country: Pointer;   // WORD* in/out
  countryCapacity: Integer;   // INT
  status: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuuc.dll' name 'uloc_getDisplayCountry';

result := DllCall("icuuc\uloc_getDisplayCountry"
    , "AStr", locale   ; LPCSTR
    , "AStr", displayLocale   ; LPCSTR
    , "Ptr", country   ; WORD* in/out
    , "Int", countryCapacity   ; INT
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●uloc_getDisplayCountry(locale, displayLocale, country, countryCapacity, status) = DLL("icuuc.dll", "int uloc_getDisplayCountry(char*, char*, void*, int, void*)")
# 呼び出し: uloc_getDisplayCountry(locale, displayLocale, country, countryCapacity, status)
# locale : LPCSTR -> "char*"
# displayLocale : LPCSTR -> "char*"
# country : WORD* in/out -> "void*"
# countryCapacity : 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。