WSASetBlockingHook

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

FARPROC WSASetBlockingHook(
    FARPROC lpBlockFunc
);

<DllImport("WS2_32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WSASetBlockingHook(
    lpBlockFunc As IntPtr   ' FARPROC
) As IntPtr
End Function

' lpBlockFunc : FARPROC
Declare PtrSafe Function WSASetBlockingHook Lib "ws2_32" ( _
    ByVal lpBlockFunc As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

WSASetBlockingHook = ctypes.windll.ws2_32.WSASetBlockingHook
WSASetBlockingHook.restype = ctypes.c_void_p
WSASetBlockingHook.argtypes = [
    ctypes.c_void_p,  # lpBlockFunc : FARPROC
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
WSASetBlockingHook = Fiddle::Function.new(
  lib['WSASetBlockingHook'],
  [
    Fiddle::TYPE_VOIDP,  # lpBlockFunc : FARPROC
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "ws2_32")]
extern "system" {
    fn WSASetBlockingHook(
        lpBlockFunc: *const core::ffi::c_void  // FARPROC
    ) -> *const core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", SetLastError = true)]
public static extern IntPtr WSASetBlockingHook(IntPtr lpBlockFunc);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_WSASetBlockingHook' -Namespace Win32 -PassThru
# $api::WSASetBlockingHook(lpBlockFunc)

#uselib "WS2_32.dll"
#func global WSASetBlockingHook "WSASetBlockingHook" sptr
; WSASetBlockingHook lpBlockFunc   ; 戻り値は stat
; lpBlockFunc : FARPROC -> "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 "WS2_32.dll"
#cfunc global WSASetBlockingHook "WSASetBlockingHook" sptr
; res = WSASetBlockingHook(lpBlockFunc)
; lpBlockFunc : FARPROC -> "sptr"

; FARPROC WSASetBlockingHook(FARPROC lpBlockFunc)
#uselib "WS2_32.dll"
#cfunc global WSASetBlockingHook "WSASetBlockingHook" intptr
; res = WSASetBlockingHook(lpBlockFunc)
; lpBlockFunc : FARPROC -> "intptr"

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

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procWSASetBlockingHook = ws2_32.NewProc("WSASetBlockingHook")
)

// lpBlockFunc (FARPROC)
r1, _, err := procWSASetBlockingHook.Call(
	uintptr(lpBlockFunc),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // FARPROC

function WSASetBlockingHook(
  lpBlockFunc: Pointer   // FARPROC
): Pointer; stdcall;
  external 'WS2_32.dll' name 'WSASetBlockingHook';

result := DllCall("WS2_32\WSASetBlockingHook"
    , "Ptr", lpBlockFunc   ; FARPROC
    , "Ptr")   ; return: FARPROC

●WSASetBlockingHook(lpBlockFunc) = DLL("WS2_32.dll", "void* WSASetBlockingHook(void*)")
# 呼び出し: WSASetBlockingHook(lpBlockFunc)
# lpBlockFunc : FARPROC -> "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)。