WSARecvFrom

// WS2_32.dll
#include <windows.h>

INT WSARecvFrom(
    SOCKET s,
    WSABUF* lpBuffers,
    DWORD dwBufferCount,
    DWORD* lpNumberOfBytesRecvd,   // optional
    DWORD* lpFlags,
    SOCKADDR* lpFrom,   // optional
    INT* lpFromlen,   // optional
    OVERLAPPED* lpOverlapped,   // optional
    LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine   // optional
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WSARecvFrom(
    s As UIntPtr,   ' SOCKET
    lpBuffers As IntPtr,   ' WSABUF*
    dwBufferCount As UInteger,   ' DWORD
    lpNumberOfBytesRecvd As IntPtr,   ' DWORD* optional, out
    ByRef lpFlags As UInteger,   ' DWORD* in/out
    lpFrom As IntPtr,   ' SOCKADDR* optional, out
    lpFromlen As IntPtr,   ' INT* optional, in/out
    lpOverlapped As IntPtr,   ' OVERLAPPED* optional, in/out
    lpCompletionRoutine As IntPtr   ' LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
) As Integer
End Function

' s : SOCKET
' lpBuffers : WSABUF*
' dwBufferCount : DWORD
' lpNumberOfBytesRecvd : DWORD* optional, out
' lpFlags : DWORD* in/out
' lpFrom : SOCKADDR* optional, out
' lpFromlen : INT* optional, in/out
' lpOverlapped : OVERLAPPED* optional, in/out
' lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
Declare PtrSafe Function WSARecvFrom Lib "ws2_32" ( _
    ByVal s As LongPtr, _
    ByVal lpBuffers As LongPtr, _
    ByVal dwBufferCount As Long, _
    ByVal lpNumberOfBytesRecvd As LongPtr, _
    ByRef lpFlags As Long, _
    ByVal lpFrom As LongPtr, _
    ByVal lpFromlen As LongPtr, _
    ByVal lpOverlapped As LongPtr, _
    ByVal lpCompletionRoutine As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

WSARecvFrom = ctypes.windll.ws2_32.WSARecvFrom
WSARecvFrom.restype = ctypes.c_int
WSARecvFrom.argtypes = [
    ctypes.c_size_t,  # s : SOCKET
    ctypes.c_void_p,  # lpBuffers : WSABUF*
    wintypes.DWORD,  # dwBufferCount : DWORD
    ctypes.POINTER(wintypes.DWORD),  # lpNumberOfBytesRecvd : DWORD* optional, out
    ctypes.POINTER(wintypes.DWORD),  # lpFlags : DWORD* in/out
    ctypes.c_void_p,  # lpFrom : SOCKADDR* optional, out
    ctypes.POINTER(ctypes.c_int),  # lpFromlen : INT* optional, in/out
    ctypes.c_void_p,  # lpOverlapped : OVERLAPPED* optional, in/out
    ctypes.c_void_p,  # lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
WSARecvFrom = Fiddle::Function.new(
  lib['WSARecvFrom'],
  [
    Fiddle::TYPE_UINTPTR_T,  # s : SOCKET
    Fiddle::TYPE_VOIDP,  # lpBuffers : WSABUF*
    -Fiddle::TYPE_INT,  # dwBufferCount : DWORD
    Fiddle::TYPE_VOIDP,  # lpNumberOfBytesRecvd : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # lpFlags : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # lpFrom : SOCKADDR* optional, out
    Fiddle::TYPE_VOIDP,  # lpFromlen : INT* optional, in/out
    Fiddle::TYPE_VOIDP,  # lpOverlapped : OVERLAPPED* optional, in/out
    Fiddle::TYPE_VOIDP,  # lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "ws2_32")]
extern "system" {
    fn WSARecvFrom(
        s: usize,  // SOCKET
        lpBuffers: *mut WSABUF,  // WSABUF*
        dwBufferCount: u32,  // DWORD
        lpNumberOfBytesRecvd: *mut u32,  // DWORD* optional, out
        lpFlags: *mut u32,  // DWORD* in/out
        lpFrom: *mut SOCKADDR,  // SOCKADDR* optional, out
        lpFromlen: *mut i32,  // INT* optional, in/out
        lpOverlapped: *mut OVERLAPPED,  // OVERLAPPED* optional, in/out
        lpCompletionRoutine: *const core::ffi::c_void  // LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern int WSARecvFrom(UIntPtr s, IntPtr lpBuffers, uint dwBufferCount, IntPtr lpNumberOfBytesRecvd, ref uint lpFlags, IntPtr lpFrom, IntPtr lpFromlen, IntPtr lpOverlapped, IntPtr lpCompletionRoutine);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_WSARecvFrom' -Namespace Win32 -PassThru
# $api::WSARecvFrom(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpFrom, lpFromlen, lpOverlapped, lpCompletionRoutine)

#uselib "WS2_32.dll"
#func global WSARecvFrom "WSARecvFrom" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; WSARecvFrom s, varptr(lpBuffers), dwBufferCount, varptr(lpNumberOfBytesRecvd), varptr(lpFlags), varptr(lpFrom), varptr(lpFromlen), varptr(lpOverlapped), lpCompletionRoutine   ; 戻り値は stat
; s : SOCKET -> "sptr"
; lpBuffers : WSABUF* -> "sptr"
; dwBufferCount : DWORD -> "sptr"
; lpNumberOfBytesRecvd : DWORD* optional, out -> "sptr"
; lpFlags : DWORD* in/out -> "sptr"
; lpFrom : SOCKADDR* optional, out -> "sptr"
; lpFromlen : INT* optional, in/out -> "sptr"
; lpOverlapped : OVERLAPPED* optional, in/out -> "sptr"
; lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> "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。

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

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procWSARecvFrom = ws2_32.NewProc("WSARecvFrom")
)

// s (SOCKET), lpBuffers (WSABUF*), dwBufferCount (DWORD), lpNumberOfBytesRecvd (DWORD* optional, out), lpFlags (DWORD* in/out), lpFrom (SOCKADDR* optional, out), lpFromlen (INT* optional, in/out), lpOverlapped (OVERLAPPED* optional, in/out), lpCompletionRoutine (LPWSAOVERLAPPED_COMPLETION_ROUTINE optional)
r1, _, err := procWSARecvFrom.Call(
	uintptr(s),
	uintptr(lpBuffers),
	uintptr(dwBufferCount),
	uintptr(lpNumberOfBytesRecvd),
	uintptr(lpFlags),
	uintptr(lpFrom),
	uintptr(lpFromlen),
	uintptr(lpOverlapped),
	uintptr(lpCompletionRoutine),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function WSARecvFrom(
  s: NativeUInt;   // SOCKET
  lpBuffers: Pointer;   // WSABUF*
  dwBufferCount: DWORD;   // DWORD
  lpNumberOfBytesRecvd: Pointer;   // DWORD* optional, out
  lpFlags: Pointer;   // DWORD* in/out
  lpFrom: Pointer;   // SOCKADDR* optional, out
  lpFromlen: Pointer;   // INT* optional, in/out
  lpOverlapped: Pointer;   // OVERLAPPED* optional, in/out
  lpCompletionRoutine: Pointer   // LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
): Integer; stdcall;
  external 'WS2_32.dll' name 'WSARecvFrom';

result := DllCall("WS2_32\WSARecvFrom"
    , "UPtr", s   ; SOCKET
    , "Ptr", lpBuffers   ; WSABUF*
    , "UInt", dwBufferCount   ; DWORD
    , "Ptr", lpNumberOfBytesRecvd   ; DWORD* optional, out
    , "Ptr", lpFlags   ; DWORD* in/out
    , "Ptr", lpFrom   ; SOCKADDR* optional, out
    , "Ptr", lpFromlen   ; INT* optional, in/out
    , "Ptr", lpOverlapped   ; OVERLAPPED* optional, in/out
    , "Ptr", lpCompletionRoutine   ; LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
    , "Int")   ; return: INT

●WSARecvFrom(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpFrom, lpFromlen, lpOverlapped, lpCompletionRoutine) = DLL("WS2_32.dll", "int WSARecvFrom(int, void*, dword, void*, void*, void*, void*, void*, void*)")
# 呼び出し: WSARecvFrom(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpFrom, lpFromlen, lpOverlapped, lpCompletionRoutine)
# s : SOCKET -> "int"
# lpBuffers : WSABUF* -> "void*"
# dwBufferCount : DWORD -> "dword"
# lpNumberOfBytesRecvd : DWORD* optional, out -> "void*"
# lpFlags : DWORD* in/out -> "void*"
# lpFrom : SOCKADDR* optional, out -> "void*"
# lpFromlen : INT* optional, in/out -> "void*"
# lpOverlapped : OVERLAPPED* optional, in/out -> "void*"
# lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> "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)。

const std = @import("std");

extern "ws2_32" fn WSARecvFrom(
    s: usize, // SOCKET
    lpBuffers: [*c]WSABUF, // WSABUF*
    dwBufferCount: u32, // DWORD
    lpNumberOfBytesRecvd: [*c]u32, // DWORD* optional, out
    lpFlags: [*c]u32, // DWORD* in/out
    lpFrom: [*c]SOCKADDR, // SOCKADDR* optional, out
    lpFromlen: [*c]i32, // INT* optional, in/out
    lpOverlapped: [*c]OVERLAPPED, // OVERLAPPED* optional, in/out
    lpCompletionRoutine: ?*anyopaque // LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
) callconv(std.os.windows.WINAPI) i32;

proc WSARecvFrom(
    s: uint,  # SOCKET
    lpBuffers: ptr WSABUF,  # WSABUF*
    dwBufferCount: uint32,  # DWORD
    lpNumberOfBytesRecvd: ptr uint32,  # DWORD* optional, out
    lpFlags: ptr uint32,  # DWORD* in/out
    lpFrom: ptr SOCKADDR,  # SOCKADDR* optional, out
    lpFromlen: ptr int32,  # INT* optional, in/out
    lpOverlapped: ptr OVERLAPPED,  # OVERLAPPED* optional, in/out
    lpCompletionRoutine: pointer  # LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
): int32 {.importc: "WSARecvFrom", stdcall, dynlib: "WS2_32.dll".}

pragma(lib, "ws2_32");
extern(Windows)
int WSARecvFrom(
    size_t s,   // SOCKET
    WSABUF* lpBuffers,   // WSABUF*
    uint dwBufferCount,   // DWORD
    uint* lpNumberOfBytesRecvd,   // DWORD* optional, out
    uint* lpFlags,   // DWORD* in/out
    SOCKADDR* lpFrom,   // SOCKADDR* optional, out
    int* lpFromlen,   // INT* optional, in/out
    OVERLAPPED* lpOverlapped,   // OVERLAPPED* optional, in/out
    void* lpCompletionRoutine   // LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
);

ccall((:WSARecvFrom, "WS2_32.dll"), stdcall, Int32,
      (Csize_t, Ptr{WSABUF}, UInt32, Ptr{UInt32}, Ptr{UInt32}, Ptr{SOCKADDR}, Ptr{Int32}, Ptr{OVERLAPPED}, Ptr{Cvoid}),
      s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpFrom, lpFromlen, lpOverlapped, lpCompletionRoutine)
# s : SOCKET -> Csize_t
# lpBuffers : WSABUF* -> Ptr{WSABUF}
# dwBufferCount : DWORD -> UInt32
# lpNumberOfBytesRecvd : DWORD* optional, out -> Ptr{UInt32}
# lpFlags : DWORD* in/out -> Ptr{UInt32}
# lpFrom : SOCKADDR* optional, out -> Ptr{SOCKADDR}
# lpFromlen : INT* optional, in/out -> Ptr{Int32}
# lpOverlapped : OVERLAPPED* optional, in/out -> Ptr{OVERLAPPED}
# lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> Ptr{Cvoid}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t WSARecvFrom(
    uintptr_t s,
    void* lpBuffers,
    uint32_t dwBufferCount,
    uint32_t* lpNumberOfBytesRecvd,
    uint32_t* lpFlags,
    void* lpFrom,
    int32_t* lpFromlen,
    void* lpOverlapped,
    void* lpCompletionRoutine);
]]
local ws2_32 = ffi.load("ws2_32")
-- ws2_32.WSARecvFrom(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpFrom, lpFromlen, lpOverlapped, lpCompletionRoutine)
-- s : SOCKET
-- lpBuffers : WSABUF*
-- dwBufferCount : DWORD
-- lpNumberOfBytesRecvd : DWORD* optional, out
-- lpFlags : DWORD* in/out
-- lpFrom : SOCKADDR* optional, out
-- lpFromlen : INT* optional, in/out
-- lpOverlapped : OVERLAPPED* optional, in/out
-- lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('WS2_32.dll');
const WSARecvFrom = lib.func('__stdcall', 'WSARecvFrom', 'int32_t', ['uintptr_t', 'void *', 'uint32_t', 'uint32_t *', 'uint32_t *', 'void *', 'int32_t *', 'void *', 'void *']);
// WSARecvFrom(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpFrom, lpFromlen, lpOverlapped, lpCompletionRoutine)
// s : SOCKET -> 'uintptr_t'
// lpBuffers : WSABUF* -> 'void *'
// dwBufferCount : DWORD -> 'uint32_t'
// lpNumberOfBytesRecvd : DWORD* optional, out -> 'uint32_t *'
// lpFlags : DWORD* in/out -> 'uint32_t *'
// lpFrom : SOCKADDR* optional, out -> 'void *'
// lpFromlen : INT* optional, in/out -> 'int32_t *'
// lpOverlapped : OVERLAPPED* optional, in/out -> 'void *'
// lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。
// コールバック(関数ポインタ)は koffi.proto/koffi.register で型を定義して渡す(素の void* では JS 関数を渡せない)。

const lib = Deno.dlopen("WS2_32.dll", {
  WSARecvFrom: { parameters: ["usize", "pointer", "u32", "pointer", "pointer", "pointer", "pointer", "pointer", "pointer"], result: "i32" },
});
// lib.symbols.WSARecvFrom(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpFrom, lpFromlen, lpOverlapped, lpCompletionRoutine)
// s : SOCKET -> "usize"
// lpBuffers : WSABUF* -> "pointer"
// dwBufferCount : DWORD -> "u32"
// lpNumberOfBytesRecvd : DWORD* optional, out -> "pointer"
// lpFlags : DWORD* in/out -> "pointer"
// lpFrom : SOCKADDR* optional, out -> "pointer"
// lpFromlen : INT* optional, in/out -> "pointer"
// lpOverlapped : OVERLAPPED* optional, in/out -> "pointer"
// lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t WSARecvFrom(
    size_t s,
    void* lpBuffers,
    uint32_t dwBufferCount,
    uint32_t* lpNumberOfBytesRecvd,
    uint32_t* lpFlags,
    void* lpFrom,
    int32_t* lpFromlen,
    void* lpOverlapped,
    void* lpCompletionRoutine);
C, "WS2_32.dll");
// $ffi->WSARecvFrom(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpFrom, lpFromlen, lpOverlapped, lpCompletionRoutine);
// s : SOCKET
// lpBuffers : WSABUF*
// dwBufferCount : DWORD
// lpNumberOfBytesRecvd : DWORD* optional, out
// lpFlags : DWORD* in/out
// lpFrom : SOCKADDR* optional, out
// lpFromlen : INT* optional, in/out
// lpOverlapped : OVERLAPPED* optional, in/out
// lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Ws2_32 extends StdCallLibrary {
    Ws2_32 INSTANCE = Native.load("ws2_32", Ws2_32.class);
    int WSARecvFrom(
        long s,   // SOCKET
        Pointer lpBuffers,   // WSABUF*
        int dwBufferCount,   // DWORD
        IntByReference lpNumberOfBytesRecvd,   // DWORD* optional, out
        IntByReference lpFlags,   // DWORD* in/out
        Pointer lpFrom,   // SOCKADDR* optional, out
        IntByReference lpFromlen,   // INT* optional, in/out
        Pointer lpOverlapped,   // OVERLAPPED* optional, in/out
        Callback lpCompletionRoutine   // LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
    );
}

@[Link("ws2_32")]
lib LibWS2_32
  fun WSARecvFrom = WSARecvFrom(
    s : LibC::SizeT,   # SOCKET
    lpBuffers : WSABUF*,   # WSABUF*
    dwBufferCount : UInt32,   # DWORD
    lpNumberOfBytesRecvd : UInt32*,   # DWORD* optional, out
    lpFlags : UInt32*,   # DWORD* in/out
    lpFrom : SOCKADDR*,   # SOCKADDR* optional, out
    lpFromlen : Int32*,   # INT* optional, in/out
    lpOverlapped : OVERLAPPED*,   # OVERLAPPED* optional, in/out
    lpCompletionRoutine : Void*   # LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef WSARecvFromNative = Int32 Function(UintPtr, Pointer<Void>, Uint32, Pointer<Uint32>, Pointer<Uint32>, Pointer<Void>, Pointer<Int32>, Pointer<Void>, Pointer<Void>);
typedef WSARecvFromDart = int Function(int, Pointer<Void>, int, Pointer<Uint32>, Pointer<Uint32>, Pointer<Void>, Pointer<Int32>, Pointer<Void>, Pointer<Void>);
final WSARecvFrom = DynamicLibrary.open('WS2_32.dll')
    .lookupFunction<WSARecvFromNative, WSARecvFromDart>('WSARecvFrom');
// s : SOCKET -> UintPtr
// lpBuffers : WSABUF* -> Pointer<Void>
// dwBufferCount : DWORD -> Uint32
// lpNumberOfBytesRecvd : DWORD* optional, out -> Pointer<Uint32>
// lpFlags : DWORD* in/out -> Pointer<Uint32>
// lpFrom : SOCKADDR* optional, out -> Pointer<Void>
// lpFromlen : INT* optional, in/out -> Pointer<Int32>
// lpOverlapped : OVERLAPPED* optional, in/out -> Pointer<Void>
// lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function WSARecvFrom(
  s: NativeUInt;   // SOCKET
  lpBuffers: Pointer;   // WSABUF*
  dwBufferCount: DWORD;   // DWORD
  lpNumberOfBytesRecvd: Pointer;   // DWORD* optional, out
  lpFlags: Pointer;   // DWORD* in/out
  lpFrom: Pointer;   // SOCKADDR* optional, out
  lpFromlen: Pointer;   // INT* optional, in/out
  lpOverlapped: Pointer;   // OVERLAPPED* optional, in/out
  lpCompletionRoutine: Pointer   // LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
): Integer; stdcall;
  external 'WS2_32.dll' name 'WSARecvFrom';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "WSARecvFrom"
  c_WSARecvFrom :: CUIntPtr -> Ptr () -> Word32 -> Ptr Word32 -> Ptr Word32 -> Ptr () -> Ptr Int32 -> Ptr () -> Ptr () -> IO Int32
-- s : SOCKET -> CUIntPtr
-- lpBuffers : WSABUF* -> Ptr ()
-- dwBufferCount : DWORD -> Word32
-- lpNumberOfBytesRecvd : DWORD* optional, out -> Ptr Word32
-- lpFlags : DWORD* in/out -> Ptr Word32
-- lpFrom : SOCKADDR* optional, out -> Ptr ()
-- lpFromlen : INT* optional, in/out -> Ptr Int32
-- lpOverlapped : OVERLAPPED* optional, in/out -> Ptr ()
-- lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> Ptr ()
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let wsarecvfrom =
  foreign "WSARecvFrom"
    (size_t @-> (ptr void) @-> uint32_t @-> (ptr uint32_t) @-> (ptr uint32_t) @-> (ptr void) @-> (ptr int32_t) @-> (ptr void) @-> (ptr void) @-> returning int32_t)
(* s : SOCKET -> size_t *)
(* lpBuffers : WSABUF* -> (ptr void) *)
(* dwBufferCount : DWORD -> uint32_t *)
(* lpNumberOfBytesRecvd : DWORD* optional, out -> (ptr uint32_t) *)
(* lpFlags : DWORD* in/out -> (ptr uint32_t) *)
(* lpFrom : SOCKADDR* optional, out -> (ptr void) *)
(* lpFromlen : INT* optional, in/out -> (ptr int32_t) *)
(* lpOverlapped : OVERLAPPED* optional, in/out -> (ptr void) *)
(* lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> (ptr void) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library ws2_32 (t "WS2_32.dll"))
(cffi:use-foreign-library ws2_32)

(cffi:defcfun ("WSARecvFrom" wsarecv-from :convention :stdcall) :int32
  (s :uint64)   ; SOCKET
  (lp-buffers :pointer)   ; WSABUF*
  (dw-buffer-count :uint32)   ; DWORD
  (lp-number-of-bytes-recvd :pointer)   ; DWORD* optional, out
  (lp-flags :pointer)   ; DWORD* in/out
  (lp-from :pointer)   ; SOCKADDR* optional, out
  (lp-fromlen :pointer)   ; INT* optional, in/out
  (lp-overlapped :pointer)   ; OVERLAPPED* optional, in/out
  (lp-completion-routine :pointer))   ; LPWSAOVERLAPPED_COMPLETION_ROUTINE optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $WSARecvFrom = Win32::API::More->new('WS2_32',
    'int WSARecvFrom(WPARAM s, LPVOID lpBuffers, DWORD dwBufferCount, LPVOID lpNumberOfBytesRecvd, LPVOID lpFlags, LPVOID lpFrom, LPVOID lpFromlen, LPVOID lpOverlapped, LPVOID lpCompletionRoutine)');
# my $ret = $WSARecvFrom->Call($s, $lpBuffers, $dwBufferCount, $lpNumberOfBytesRecvd, $lpFlags, $lpFrom, $lpFromlen, $lpOverlapped, $lpCompletionRoutine);
# s : SOCKET -> WPARAM
# lpBuffers : WSABUF* -> LPVOID
# dwBufferCount : DWORD -> DWORD
# lpNumberOfBytesRecvd : DWORD* optional, out -> LPVOID
# lpFlags : DWORD* in/out -> LPVOID
# lpFrom : SOCKADDR* optional, out -> LPVOID
# lpFromlen : INT* optional, in/out -> LPVOID
# lpOverlapped : OVERLAPPED* optional, in/out -> LPVOID
# lpCompletionRoutine : LPWSAOVERLAPPED_COMPLETION_ROUTINE optional -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# コールバック(関数ポインタ)は Perl sub を直接渡せません。Win32::API::Callback を使用してください。