VarUI2FromR8

// OLEAUT32.dll
#include <windows.h>

HRESULT VarUI2FromR8(
    DOUBLE dblIn,
    WORD* puiOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarUI2FromR8(
    dblIn As Double,   ' DOUBLE
    ByRef puiOut As UShort   ' WORD* in/out
) As Integer
End Function

' dblIn : DOUBLE
' puiOut : WORD* in/out
Declare PtrSafe Function VarUI2FromR8 Lib "oleaut32" ( _
    ByVal dblIn As Double, _
    ByRef puiOut As Integer) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VarUI2FromR8 = ctypes.windll.oleaut32.VarUI2FromR8
VarUI2FromR8.restype = ctypes.c_int
VarUI2FromR8.argtypes = [
    ctypes.c_double,  # dblIn : DOUBLE
    ctypes.POINTER(ctypes.c_ushort),  # puiOut : WORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarUI2FromR8 = Fiddle::Function.new(
  lib['VarUI2FromR8'],
  [
    Fiddle::TYPE_DOUBLE,  # dblIn : DOUBLE
    Fiddle::TYPE_VOIDP,  # puiOut : WORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarUI2FromR8(
        dblIn: f64,  // DOUBLE
        puiOut: *mut u16  // WORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarUI2FromR8(double dblIn, ref ushort puiOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarUI2FromR8' -Namespace Win32 -PassThru
# $api::VarUI2FromR8(dblIn, puiOut)

#uselib "OLEAUT32.dll"
#func global VarUI2FromR8 "VarUI2FromR8" double, sptr
; VarUI2FromR8 dblIn, varptr(puiOut)   ; 戻り値は stat
; dblIn : DOUBLE -> "double"
; puiOut : WORD* 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 "OLEAUT32.dll"
#cfunc global VarUI2FromR8 "VarUI2FromR8" double, var
; res = VarUI2FromR8(dblIn, puiOut)
; dblIn : DOUBLE -> "double"
; puiOut : WORD* in/out -> "var"
; ※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。

; HRESULT VarUI2FromR8(DOUBLE dblIn, WORD* puiOut)
#uselib "OLEAUT32.dll"
#cfunc global VarUI2FromR8 "VarUI2FromR8" double, var
; res = VarUI2FromR8(dblIn, puiOut)
; dblIn : DOUBLE -> "double"
; puiOut : WORD* in/out -> "var"
; ※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 (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarUI2FromR8 = oleaut32.NewProc("VarUI2FromR8")
)

// dblIn (DOUBLE), puiOut (WORD* in/out)
r1, _, err := procVarUI2FromR8.Call(
	uintptr(math.Float64bits(dblIn)),
	uintptr(puiOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT
// 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 VarUI2FromR8(
  dblIn: Double;   // DOUBLE
  puiOut: Pointer   // WORD* in/out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarUI2FromR8';

result := DllCall("OLEAUT32\VarUI2FromR8"
    , "Double", dblIn   ; DOUBLE
    , "Ptr", puiOut   ; WORD* in/out
    , "Int")   ; return: HRESULT

●VarUI2FromR8(dblIn, puiOut) = DLL("OLEAUT32.dll", "int VarUI2FromR8(double, void*)")
# 呼び出し: VarUI2FromR8(dblIn, puiOut)
# dblIn : DOUBLE -> "double"
# puiOut : WORD* 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)。