unumf_resultToDecimalNumber

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

INT unumf_resultToDecimalNumber(
    const UFormattedNumber* uresult,
    LPSTR dest,
    INT destCapacity,
    UErrorCode* ec
);

<DllImport("icu.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function unumf_resultToDecimalNumber(
    ByRef uresult As IntPtr,   ' UFormattedNumber*
    <MarshalAs(UnmanagedType.LPStr)> dest As String,   ' LPSTR
    destCapacity As Integer,   ' INT
    ByRef ec As Integer   ' UErrorCode* in/out
) As Integer
End Function

' uresult : UFormattedNumber*
' dest : LPSTR
' destCapacity : INT
' ec : UErrorCode* in/out
Declare PtrSafe Function unumf_resultToDecimalNumber Lib "icu" ( _
    ByRef uresult As LongPtr, _
    ByVal dest As String, _
    ByVal destCapacity As Long, _
    ByRef ec 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

unumf_resultToDecimalNumber = ctypes.cdll.icu.unumf_resultToDecimalNumber
unumf_resultToDecimalNumber.restype = ctypes.c_int
unumf_resultToDecimalNumber.argtypes = [
    ctypes.c_void_p,  # uresult : UFormattedNumber*
    wintypes.LPCSTR,  # dest : LPSTR
    ctypes.c_int,  # destCapacity : INT
    ctypes.c_void_p,  # ec : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icu.dll')
unumf_resultToDecimalNumber = Fiddle::Function.new(
  lib['unumf_resultToDecimalNumber'],
  [
    Fiddle::TYPE_VOIDP,  # uresult : UFormattedNumber*
    Fiddle::TYPE_VOIDP,  # dest : LPSTR
    Fiddle::TYPE_INT,  # destCapacity : INT
    Fiddle::TYPE_VOIDP,  # ec : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icu")]
extern "C" {
    fn unumf_resultToDecimalNumber(
        uresult: *const isize,  // UFormattedNumber*
        dest: *mut u8,  // LPSTR
        destCapacity: i32,  // INT
        ec: *mut i32  // UErrorCode* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icu.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int unumf_resultToDecimalNumber(ref IntPtr uresult, [MarshalAs(UnmanagedType.LPStr)] string dest, int destCapacity, ref int ec);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icu_unumf_resultToDecimalNumber' -Namespace Win32 -PassThru
# $api::unumf_resultToDecimalNumber(uresult, dest, destCapacity, ec)

#uselib "icu.dll"
#func global unumf_resultToDecimalNumber "unumf_resultToDecimalNumber" sptr, sptr, sptr, sptr
; unumf_resultToDecimalNumber uresult, dest, destCapacity, ec   ; 戻り値は stat
; uresult : UFormattedNumber* -> "sptr"
; dest : LPSTR -> "sptr"
; destCapacity : INT -> "sptr"
; ec : 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 "icu.dll"
#cfunc global unumf_resultToDecimalNumber "unumf_resultToDecimalNumber" int, str, int, int
; res = unumf_resultToDecimalNumber(uresult, dest, destCapacity, ec)
; uresult : UFormattedNumber* -> "int"
; dest : LPSTR -> "str"
; destCapacity : INT -> "int"
; ec : UErrorCode* in/out -> "int"

; INT unumf_resultToDecimalNumber(UFormattedNumber* uresult, LPSTR dest, INT destCapacity, UErrorCode* ec)
#uselib "icu.dll"
#cfunc global unumf_resultToDecimalNumber "unumf_resultToDecimalNumber" int, str, int, int
; res = unumf_resultToDecimalNumber(uresult, dest, destCapacity, ec)
; uresult : UFormattedNumber* -> "int"
; dest : LPSTR -> "str"
; destCapacity : INT -> "int"
; ec : UErrorCode* in/out -> "int"

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

var (
	icu = windows.NewLazySystemDLL("icu.dll")
	procunumf_resultToDecimalNumber = icu.NewProc("unumf_resultToDecimalNumber")
)

// uresult (UFormattedNumber*), dest (LPSTR), destCapacity (INT), ec (UErrorCode* in/out)
r1, _, err := procunumf_resultToDecimalNumber.Call(
	uintptr(uresult),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(dest))),
	uintptr(destCapacity),
	uintptr(ec),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function unumf_resultToDecimalNumber(
  uresult: Pointer;   // UFormattedNumber*
  dest: PAnsiChar;   // LPSTR
  destCapacity: Integer;   // INT
  ec: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icu.dll' name 'unumf_resultToDecimalNumber';

result := DllCall("icu\unumf_resultToDecimalNumber"
    , "Ptr", uresult   ; UFormattedNumber*
    , "AStr", dest   ; LPSTR
    , "Int", destCapacity   ; INT
    , "Ptr", ec   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●unumf_resultToDecimalNumber(uresult, dest, destCapacity, ec) = DLL("icu.dll", "int unumf_resultToDecimalNumber(void*, char*, int, void*)")
# 呼び出し: unumf_resultToDecimalNumber(uresult, dest, destCapacity, ec)
# uresult : UFormattedNumber* -> "void*"
# dest : LPSTR -> "char*"
# destCapacity : INT -> "int"
# ec : 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。