recvfrom

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

INT recvfrom(
    SOCKET s,
    LPSTR buf,
    INT len,
    INT flags,
    SOCKADDR* from,   // optional
    INT* fromlen   // optional
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function recvfrom(
    s As UIntPtr,   ' SOCKET
    <MarshalAs(UnmanagedType.LPStr)> buf As System.Text.StringBuilder,   ' LPSTR out
    len As Integer,   ' INT
    flags As Integer,   ' INT
    [from] As IntPtr,   ' SOCKADDR* optional, out
    fromlen As IntPtr   ' INT* optional, in/out
) As Integer
End Function

' s : SOCKET
' buf : LPSTR out
' len : INT
' flags : INT
' from : SOCKADDR* optional, out
' fromlen : INT* optional, in/out
Declare PtrSafe Function recvfrom Lib "ws2_32" ( _
    ByVal s As LongPtr, _
    ByVal buf As String, _
    ByVal len As Long, _
    ByVal flags As Long, _
    ByVal from As LongPtr, _
    ByVal fromlen 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

recvfrom = ctypes.windll.ws2_32.recvfrom
recvfrom.restype = ctypes.c_int
recvfrom.argtypes = [
    ctypes.c_size_t,  # s : SOCKET
    wintypes.LPSTR,  # buf : LPSTR out
    ctypes.c_int,  # len : INT
    ctypes.c_int,  # flags : INT
    ctypes.c_void_p,  # from : SOCKADDR* optional, out
    ctypes.POINTER(ctypes.c_int),  # fromlen : INT* optional, in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
recvfrom = Fiddle::Function.new(
  lib['recvfrom'],
  [
    Fiddle::TYPE_UINTPTR_T,  # s : SOCKET
    Fiddle::TYPE_VOIDP,  # buf : LPSTR out
    Fiddle::TYPE_INT,  # len : INT
    Fiddle::TYPE_INT,  # flags : INT
    Fiddle::TYPE_VOIDP,  # from : SOCKADDR* optional, out
    Fiddle::TYPE_VOIDP,  # fromlen : INT* optional, in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ws2_32")]
extern "system" {
    fn recvfrom(
        s: usize,  // SOCKET
        buf: *mut u8,  // LPSTR out
        len: i32,  // INT
        flags: i32,  // INT
        from: *mut SOCKADDR,  // SOCKADDR* optional, out
        fromlen: *mut i32  // INT* optional, in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern int recvfrom(UIntPtr s, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder buf, int len, int flags, IntPtr from, IntPtr fromlen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_recvfrom' -Namespace Win32 -PassThru
# $api::recvfrom(s, buf, len, flags, from, fromlen)

#uselib "WS2_32.dll"
#func global recvfrom "recvfrom" sptr, sptr, sptr, sptr, sptr, sptr
; recvfrom s, varptr(buf), len, flags, varptr(from), varptr(fromlen)   ; 戻り値は stat
; s : SOCKET -> "sptr"
; buf : LPSTR out -> "sptr"
; len : INT -> "sptr"
; flags : INT -> "sptr"
; from : SOCKADDR* optional, out -> "sptr"
; fromlen : INT* optional, 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。

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

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procrecvfrom = ws2_32.NewProc("recvfrom")
)

// s (SOCKET), buf (LPSTR out), len (INT), flags (INT), from (SOCKADDR* optional, out), fromlen (INT* optional, in/out)
r1, _, err := procrecvfrom.Call(
	uintptr(s),
	uintptr(buf),
	uintptr(len),
	uintptr(flags),
	uintptr(from),
	uintptr(fromlen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function recvfrom(
  s: NativeUInt;   // SOCKET
  buf: PAnsiChar;   // LPSTR out
  len: Integer;   // INT
  flags: Integer;   // INT
  from: Pointer;   // SOCKADDR* optional, out
  fromlen: Pointer   // INT* optional, in/out
): Integer; stdcall;
  external 'WS2_32.dll' name 'recvfrom';

result := DllCall("WS2_32\recvfrom"
    , "UPtr", s   ; SOCKET
    , "Ptr", buf   ; LPSTR out
    , "Int", len   ; INT
    , "Int", flags   ; INT
    , "Ptr", from   ; SOCKADDR* optional, out
    , "Ptr", fromlen   ; INT* optional, in/out
    , "Int")   ; return: INT

●recvfrom(s, buf, len, flags, from, fromlen) = DLL("WS2_32.dll", "int recvfrom(int, char*, int, int, void*, void*)")
# 呼び出し: recvfrom(s, buf, len, flags, from, fromlen)
# s : SOCKET -> "int"
# buf : LPSTR out -> "char*"
# len : INT -> "int"
# flags : INT -> "int"
# from : SOCKADDR* optional, out -> "void*"
# fromlen : INT* optional, 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)。

const std = @import("std");

extern "ws2_32" fn recvfrom(
    s: usize, // SOCKET
    buf: [*c]u8, // LPSTR out
    len: i32, // INT
    flags: i32, // INT
    from: [*c]SOCKADDR, // SOCKADDR* optional, out
    fromlen: [*c]i32 // INT* optional, in/out
) callconv(std.os.windows.WINAPI) i32;

proc recvfrom(
    s: uint,  # SOCKET
    buf: ptr char,  # LPSTR out
    len: int32,  # INT
    flags: int32,  # INT
    `from`: ptr SOCKADDR,  # SOCKADDR* optional, out
    fromlen: ptr int32  # INT* optional, in/out
): int32 {.importc: "recvfrom", stdcall, dynlib: "WS2_32.dll".}

pragma(lib, "ws2_32");
extern(Windows)
int recvfrom(
    size_t s,   // SOCKET
    char* buf,   // LPSTR out
    int len,   // INT
    int flags,   // INT
    SOCKADDR* from,   // SOCKADDR* optional, out
    int* fromlen   // INT* optional, in/out
);

ccall((:recvfrom, "WS2_32.dll"), stdcall, Int32,
      (Csize_t, Ptr{UInt8}, Int32, Int32, Ptr{SOCKADDR}, Ptr{Int32}),
      s, buf, len, flags, from, fromlen)
# s : SOCKET -> Csize_t
# buf : LPSTR out -> Ptr{UInt8}
# len : INT -> Int32
# flags : INT -> Int32
# from : SOCKADDR* optional, out -> Ptr{SOCKADDR}
# fromlen : INT* optional, in/out -> Ptr{Int32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t recvfrom(
    uintptr_t s,
    char* buf,
    int32_t len,
    int32_t flags,
    void* from,
    int32_t* fromlen);
]]
local ws2_32 = ffi.load("ws2_32")
-- ws2_32.recvfrom(s, buf, len, flags, from, fromlen)
-- s : SOCKET
-- buf : LPSTR out
-- len : INT
-- flags : INT
-- from : SOCKADDR* optional, out
-- fromlen : INT* optional, in/out
-- 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 recvfrom = lib.func('__stdcall', 'recvfrom', 'int32_t', ['uintptr_t', 'char *', 'int32_t', 'int32_t', 'void *', 'int32_t *']);
// recvfrom(s, buf, len, flags, from, fromlen)
// s : SOCKET -> 'uintptr_t'
// buf : LPSTR out -> 'char *'
// len : INT -> 'int32_t'
// flags : INT -> 'int32_t'
// from : SOCKADDR* optional, out -> 'void *'
// fromlen : INT* optional, in/out -> 'int32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("WS2_32.dll", {
  recvfrom: { parameters: ["usize", "buffer", "i32", "i32", "pointer", "pointer"], result: "i32" },
});
// lib.symbols.recvfrom(s, buf, len, flags, from, fromlen)
// s : SOCKET -> "usize"
// buf : LPSTR out -> "buffer"
// len : INT -> "i32"
// flags : INT -> "i32"
// from : SOCKADDR* optional, out -> "pointer"
// fromlen : INT* optional, in/out -> "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 recvfrom(
    size_t s,
    char* buf,
    int32_t len,
    int32_t flags,
    void* from,
    int32_t* fromlen);
C, "WS2_32.dll");
// $ffi->recvfrom(s, buf, len, flags, from, fromlen);
// s : SOCKET
// buf : LPSTR out
// len : INT
// flags : INT
// from : SOCKADDR* optional, out
// fromlen : INT* optional, in/out
// 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 recvfrom(
        long s,   // SOCKET
        byte[] buf,   // LPSTR out
        int len,   // INT
        int flags,   // INT
        Pointer from,   // SOCKADDR* optional, out
        IntByReference fromlen   // INT* optional, in/out
    );
}

@[Link("ws2_32")]
lib LibWS2_32
  fun recvfrom = recvfrom(
    s : LibC::SizeT,   # SOCKET
    buf : UInt8*,   # LPSTR out
    len : Int32,   # INT
    flags : Int32,   # INT
    from : SOCKADDR*,   # SOCKADDR* optional, out
    fromlen : Int32*   # INT* optional, in/out
  ) : 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 recvfromNative = Int32 Function(UintPtr, Pointer<Utf8>, Int32, Int32, Pointer<Void>, Pointer<Int32>);
typedef recvfromDart = int Function(int, Pointer<Utf8>, int, int, Pointer<Void>, Pointer<Int32>);
final recvfrom = DynamicLibrary.open('WS2_32.dll')
    .lookupFunction<recvfromNative, recvfromDart>('recvfrom');
// s : SOCKET -> UintPtr
// buf : LPSTR out -> Pointer<Utf8>
// len : INT -> Int32
// flags : INT -> Int32
// from : SOCKADDR* optional, out -> Pointer<Void>
// fromlen : INT* optional, in/out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function recvfrom(
  s: NativeUInt;   // SOCKET
  buf: PAnsiChar;   // LPSTR out
  len: Integer;   // INT
  flags: Integer;   // INT
  from: Pointer;   // SOCKADDR* optional, out
  fromlen: Pointer   // INT* optional, in/out
): Integer; stdcall;
  external 'WS2_32.dll' name 'recvfrom';

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

foreign import stdcall safe "recvfrom"
  c_recvfrom :: CUIntPtr -> CString -> Int32 -> Int32 -> Ptr () -> Ptr Int32 -> IO Int32
-- s : SOCKET -> CUIntPtr
-- buf : LPSTR out -> CString
-- len : INT -> Int32
-- flags : INT -> Int32
-- from : SOCKADDR* optional, out -> Ptr ()
-- fromlen : INT* optional, in/out -> Ptr Int32
-- 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 recvfrom =
  foreign "recvfrom"
    (size_t @-> string @-> int32_t @-> int32_t @-> (ptr void) @-> (ptr int32_t) @-> returning int32_t)
(* s : SOCKET -> size_t *)
(* buf : LPSTR out -> string *)
(* len : INT -> int32_t *)
(* flags : INT -> int32_t *)
(* from : SOCKADDR* optional, out -> (ptr void) *)
(* fromlen : INT* optional, in/out -> (ptr int32_t) *)
(* 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 ("recvfrom" recvfrom :convention :stdcall) :int32
  (s :uint64)   ; SOCKET
  (buf :pointer)   ; LPSTR out
  (len :int32)   ; INT
  (flags :int32)   ; INT
  (from :pointer)   ; SOCKADDR* optional, out
  (fromlen :pointer))   ; INT* optional, in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $recvfrom = Win32::API::More->new('WS2_32',
    'int recvfrom(WPARAM s, LPSTR buf, int len, int flags, LPVOID from, LPVOID fromlen)');
# my $ret = $recvfrom->Call($s, $buf, $len, $flags, $from, $fromlen);
# s : SOCKET -> WPARAM
# buf : LPSTR out -> LPSTR
# len : INT -> int
# flags : INT -> int
# from : SOCKADDR* optional, out -> LPVOID
# fromlen : INT* optional, in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。