udat_setContext

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

void udat_setContext(
    void** fmt,
    UDisplayContext value,
    UErrorCode* status
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Sub udat_setContext(
    fmt As IntPtr,   ' void** in/out
    value As Integer,   ' UDisplayContext
    ByRef status As Integer   ' UErrorCode* in/out
)
End Sub

' fmt : void** in/out
' value : UDisplayContext
' status : UErrorCode* in/out
Declare PtrSafe Sub udat_setContext Lib "icuin" ( _
    ByVal fmt As LongPtr, _
    ByVal value As Long, _
    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

udat_setContext = ctypes.cdll.icuin.udat_setContext
udat_setContext.restype = None
udat_setContext.argtypes = [
    ctypes.c_void_p,  # fmt : void** in/out
    ctypes.c_int,  # value : UDisplayContext
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
udat_setContext = Fiddle::Function.new(
  lib['udat_setContext'],
  [
    Fiddle::TYPE_VOIDP,  # fmt : void** in/out
    Fiddle::TYPE_INT,  # value : UDisplayContext
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOID, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn udat_setContext(
        fmt: *mut *mut (),  // void** in/out
        value: i32,  // UDisplayContext
        status: *mut i32  // UErrorCode* in/out
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuin.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void udat_setContext(IntPtr fmt, int value, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuin_udat_setContext' -Namespace Win32 -PassThru
# $api::udat_setContext(fmt, value, status)

#uselib "icuin.dll"
#func global udat_setContext "udat_setContext" sptr, sptr, sptr
; udat_setContext fmt, value, status
; fmt : void** in/out -> "sptr"
; value : UDisplayContext -> "sptr"
; status : UErrorCode* in/out -> "sptr"

#uselib "icuin.dll"
#func global udat_setContext "udat_setContext" sptr, int, int
; udat_setContext fmt, value, status
; fmt : void** in/out -> "sptr"
; value : UDisplayContext -> "int"
; status : UErrorCode* in/out -> "int"

; void udat_setContext(void** fmt, UDisplayContext value, UErrorCode* status)
#uselib "icuin.dll"
#func global udat_setContext "udat_setContext" intptr, int, int
; udat_setContext fmt, value, status
; fmt : void** in/out -> "intptr"
; value : UDisplayContext -> "int"
; status : UErrorCode* in/out -> "int"

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

var (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procudat_setContext = icuin.NewProc("udat_setContext")
)

// fmt (void** in/out), value (UDisplayContext), status (UErrorCode* in/out)
r1, _, err := procudat_setContext.Call(
	uintptr(fmt),
	uintptr(value),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure udat_setContext(
  fmt: Pointer;   // void** in/out
  value: Integer;   // UDisplayContext
  status: Pointer   // UErrorCode* in/out
); cdecl;
  external 'icuin.dll' name 'udat_setContext';

result := DllCall("icuin\udat_setContext"
    , "Ptr", fmt   ; void** in/out
    , "Int", value   ; UDisplayContext
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: void

●udat_setContext(fmt, value, status) = DLL("icuin.dll", "int udat_setContext(void*, int, void*)")
# 呼び出し: udat_setContext(fmt, value, status)
# fmt : void** in/out -> "void*"
# value : UDisplayContext -> "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。