uloc_setDefault

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

void uloc_setDefault(
    LPCSTR localeID,
    UErrorCode* status
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Sub uloc_setDefault(
    <MarshalAs(UnmanagedType.LPStr)> localeID As String,   ' LPCSTR
    ByRef status As Integer   ' UErrorCode* in/out
)
End Sub

' localeID : LPCSTR
' status : UErrorCode* in/out
Declare PtrSafe Sub uloc_setDefault Lib "icuuc" ( _
    ByVal localeID As String, _
    ByRef status 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_setDefault = ctypes.cdll.icuuc.uloc_setDefault
uloc_setDefault.restype = None
uloc_setDefault.argtypes = [
    wintypes.LPCSTR,  # localeID : LPCSTR
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
uloc_setDefault = Fiddle::Function.new(
  lib['uloc_setDefault'],
  [
    Fiddle::TYPE_VOIDP,  # localeID : LPCSTR
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOID, Fiddle::Function::CDECL)

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

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void uloc_setDefault([MarshalAs(UnmanagedType.LPStr)] string localeID, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_uloc_setDefault' -Namespace Win32 -PassThru
# $api::uloc_setDefault(localeID, status)

#uselib "icuuc.dll"
#func global uloc_setDefault "uloc_setDefault" sptr, sptr
; uloc_setDefault localeID, status
; localeID : LPCSTR -> "sptr"
; status : UErrorCode* in/out -> "sptr"

#uselib "icuuc.dll"
#func global uloc_setDefault "uloc_setDefault" str, int
; uloc_setDefault localeID, status
; localeID : LPCSTR -> "str"
; status : UErrorCode* in/out -> "int"

; void uloc_setDefault(LPCSTR localeID, UErrorCode* status)
#uselib "icuuc.dll"
#func global uloc_setDefault "uloc_setDefault" str, int
; uloc_setDefault localeID, status
; localeID : LPCSTR -> "str"
; status : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	proculoc_setDefault = icuuc.NewProc("uloc_setDefault")
)

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

procedure uloc_setDefault(
  localeID: PAnsiChar;   // LPCSTR
  status: Pointer   // UErrorCode* in/out
); cdecl;
  external 'icuuc.dll' name 'uloc_setDefault';

result := DllCall("icuuc\uloc_setDefault"
    , "AStr", localeID   ; LPCSTR
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: void

●uloc_setDefault(localeID, status) = DLL("icuuc.dll", "int uloc_setDefault(char*, void*)")
# 呼び出し: uloc_setDefault(localeID, status)
# localeID : LPCSTR -> "char*"
# 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。