uloc_getLanguage

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

INT uloc_getLanguage(
    LPCSTR localeID,
    LPSTR language,
    INT languageCapacity,
    UErrorCode* err
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function uloc_getLanguage(
    <MarshalAs(UnmanagedType.LPStr)> localeID As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> language As String,   ' LPSTR
    languageCapacity As Integer,   ' INT
    ByRef err As Integer   ' UErrorCode* in/out
) As Integer
End Function

' localeID : LPCSTR
' language : LPSTR
' languageCapacity : INT
' err : UErrorCode* in/out
Declare PtrSafe Function uloc_getLanguage Lib "icuuc" ( _
    ByVal localeID As String, _
    ByVal language As String, _
    ByVal languageCapacity As Long, _
    ByRef err 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_getLanguage = ctypes.cdll.icuuc.uloc_getLanguage
uloc_getLanguage.restype = ctypes.c_int
uloc_getLanguage.argtypes = [
    wintypes.LPCSTR,  # localeID : LPCSTR
    wintypes.LPCSTR,  # language : LPSTR
    ctypes.c_int,  # languageCapacity : INT
    ctypes.c_void_p,  # err : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
uloc_getLanguage = Fiddle::Function.new(
  lib['uloc_getLanguage'],
  [
    Fiddle::TYPE_VOIDP,  # localeID : LPCSTR
    Fiddle::TYPE_VOIDP,  # language : LPSTR
    Fiddle::TYPE_INT,  # languageCapacity : INT
    Fiddle::TYPE_VOIDP,  # err : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn uloc_getLanguage(
        localeID: *const u8,  // LPCSTR
        language: *mut u8,  // LPSTR
        languageCapacity: i32,  // INT
        err: *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_getLanguage([MarshalAs(UnmanagedType.LPStr)] string localeID, [MarshalAs(UnmanagedType.LPStr)] string language, int languageCapacity, ref int err);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_uloc_getLanguage' -Namespace Win32 -PassThru
# $api::uloc_getLanguage(localeID, language, languageCapacity, err)

#uselib "icuuc.dll"
#func global uloc_getLanguage "uloc_getLanguage" sptr, sptr, sptr, sptr
; uloc_getLanguage localeID, language, languageCapacity, err   ; 戻り値は stat
; localeID : LPCSTR -> "sptr"
; language : LPSTR -> "sptr"
; languageCapacity : INT -> "sptr"
; err : 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_getLanguage "uloc_getLanguage" str, str, int, int
; res = uloc_getLanguage(localeID, language, languageCapacity, err)
; localeID : LPCSTR -> "str"
; language : LPSTR -> "str"
; languageCapacity : INT -> "int"
; err : UErrorCode* in/out -> "int"

; INT uloc_getLanguage(LPCSTR localeID, LPSTR language, INT languageCapacity, UErrorCode* err)
#uselib "icuuc.dll"
#cfunc global uloc_getLanguage "uloc_getLanguage" str, str, int, int
; res = uloc_getLanguage(localeID, language, languageCapacity, err)
; localeID : LPCSTR -> "str"
; language : LPSTR -> "str"
; languageCapacity : INT -> "int"
; err : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	proculoc_getLanguage = icuuc.NewProc("uloc_getLanguage")
)

// localeID (LPCSTR), language (LPSTR), languageCapacity (INT), err (UErrorCode* in/out)
r1, _, err := proculoc_getLanguage.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(localeID))),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(language))),
	uintptr(languageCapacity),
	uintptr(err),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function uloc_getLanguage(
  localeID: PAnsiChar;   // LPCSTR
  language: PAnsiChar;   // LPSTR
  languageCapacity: Integer;   // INT
  err: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuuc.dll' name 'uloc_getLanguage';

result := DllCall("icuuc\uloc_getLanguage"
    , "AStr", localeID   ; LPCSTR
    , "AStr", language   ; LPSTR
    , "Int", languageCapacity   ; INT
    , "Ptr", err   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●uloc_getLanguage(localeID, language, languageCapacity, err) = DLL("icuuc.dll", "int uloc_getLanguage(char*, char*, int, void*)")
# 呼び出し: uloc_getLanguage(localeID, language, languageCapacity, err)
# localeID : LPCSTR -> "char*"
# language : LPSTR -> "char*"
# languageCapacity : INT -> "int"
# err : 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。