ucal_getFieldDifference

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

INT ucal_getFieldDifference(
    void** cal,
    DOUBLE target,
    UCalendarDateFields field,
    UErrorCode* status
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucal_getFieldDifference(
    cal As IntPtr,   ' void** in/out
    target As Double,   ' DOUBLE
    field As Integer,   ' UCalendarDateFields
    ByRef status As Integer   ' UErrorCode* in/out
) As Integer
End Function

' cal : void** in/out
' target : DOUBLE
' field : UCalendarDateFields
' status : UErrorCode* in/out
Declare PtrSafe Function ucal_getFieldDifference Lib "icuin" ( _
    ByVal cal As LongPtr, _
    ByVal target As Double, _
    ByVal field 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

ucal_getFieldDifference = ctypes.cdll.icuin.ucal_getFieldDifference
ucal_getFieldDifference.restype = ctypes.c_int
ucal_getFieldDifference.argtypes = [
    ctypes.c_void_p,  # cal : void** in/out
    ctypes.c_double,  # target : DOUBLE
    ctypes.c_int,  # field : UCalendarDateFields
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
ucal_getFieldDifference = Fiddle::Function.new(
  lib['ucal_getFieldDifference'],
  [
    Fiddle::TYPE_VOIDP,  # cal : void** in/out
    Fiddle::TYPE_DOUBLE,  # target : DOUBLE
    Fiddle::TYPE_INT,  # field : UCalendarDateFields
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn ucal_getFieldDifference(
        cal: *mut *mut (),  // void** in/out
        target: f64,  // DOUBLE
        field: i32,  // UCalendarDateFields
        status: *mut i32  // UErrorCode* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuin.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int ucal_getFieldDifference(IntPtr cal, double target, int field, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuin_ucal_getFieldDifference' -Namespace Win32 -PassThru
# $api::ucal_getFieldDifference(cal, target, field, status)

#uselib "icuin.dll"
#func global ucal_getFieldDifference "ucal_getFieldDifference" sptr, double, sptr, sptr
; ucal_getFieldDifference cal, target, field, status   ; 戻り値は stat
; cal : void** in/out -> "sptr"
; target : DOUBLE -> "double"
; field : UCalendarDateFields -> "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 "icuin.dll"
#cfunc global ucal_getFieldDifference "ucal_getFieldDifference" sptr, double, int, int
; res = ucal_getFieldDifference(cal, target, field, status)
; cal : void** in/out -> "sptr"
; target : DOUBLE -> "double"
; field : UCalendarDateFields -> "int"
; status : UErrorCode* in/out -> "int"

; INT ucal_getFieldDifference(void** cal, DOUBLE target, UCalendarDateFields field, UErrorCode* status)
#uselib "icuin.dll"
#cfunc global ucal_getFieldDifference "ucal_getFieldDifference" intptr, double, int, int
; res = ucal_getFieldDifference(cal, target, field, status)
; cal : void** in/out -> "intptr"
; target : DOUBLE -> "double"
; field : UCalendarDateFields -> "int"
; status : UErrorCode* in/out -> "int"

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

var (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procucal_getFieldDifference = icuin.NewProc("ucal_getFieldDifference")
)

// cal (void** in/out), target (DOUBLE), field (UCalendarDateFields), status (UErrorCode* in/out)
r1, _, err := procucal_getFieldDifference.Call(
	uintptr(cal),
	uintptr(math.Float64bits(target)),
	uintptr(field),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT
// 注意: float/double 引数は proc.Call では XMM レジスタに渡せません。
// windows.SyscallN(proc.Addr(), math.Float64bits(x), ...) もしくは cgo を使用してください。

function ucal_getFieldDifference(
  cal: Pointer;   // void** in/out
  target: Double;   // DOUBLE
  field: Integer;   // UCalendarDateFields
  status: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuin.dll' name 'ucal_getFieldDifference';

result := DllCall("icuin\ucal_getFieldDifference"
    , "Ptr", cal   ; void** in/out
    , "Double", target   ; DOUBLE
    , "Int", field   ; UCalendarDateFields
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●ucal_getFieldDifference(cal, target, field, status) = DLL("icuin.dll", "int ucal_getFieldDifference(void*, double, int, void*)")
# 呼び出し: ucal_getFieldDifference(cal, target, field, status)
# cal : void** in/out -> "void*"
# target : DOUBLE -> "double"
# field : UCalendarDateFields -> "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。