CreateMailslotA

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

HANDLE CreateMailslotA(
    LPCSTR lpName,
    DWORD nMaxMessageSize,
    DWORD lReadTimeout,
    SECURITY_ATTRIBUTES* lpSecurityAttributes   // optional
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CreateMailslotA(
    <MarshalAs(UnmanagedType.LPStr)> lpName As String,   ' LPCSTR
    nMaxMessageSize As UInteger,   ' DWORD
    lReadTimeout As UInteger,   ' DWORD
    lpSecurityAttributes As IntPtr   ' SECURITY_ATTRIBUTES* optional
) As IntPtr
End Function

' lpName : LPCSTR
' nMaxMessageSize : DWORD
' lReadTimeout : DWORD
' lpSecurityAttributes : SECURITY_ATTRIBUTES* optional
Declare PtrSafe Function CreateMailslotA Lib "kernel32" ( _
    ByVal lpName As String, _
    ByVal nMaxMessageSize As Long, _
    ByVal lReadTimeout As Long, _
    ByVal lpSecurityAttributes 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

CreateMailslotA = ctypes.windll.kernel32.CreateMailslotA
CreateMailslotA.restype = ctypes.c_void_p
CreateMailslotA.argtypes = [
    wintypes.LPCSTR,  # lpName : LPCSTR
    wintypes.DWORD,  # nMaxMessageSize : DWORD
    wintypes.DWORD,  # lReadTimeout : DWORD
    ctypes.c_void_p,  # lpSecurityAttributes : SECURITY_ATTRIBUTES* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
CreateMailslotA = Fiddle::Function.new(
  lib['CreateMailslotA'],
  [
    Fiddle::TYPE_VOIDP,  # lpName : LPCSTR
    -Fiddle::TYPE_INT,  # nMaxMessageSize : DWORD
    -Fiddle::TYPE_INT,  # lReadTimeout : DWORD
    Fiddle::TYPE_VOIDP,  # lpSecurityAttributes : SECURITY_ATTRIBUTES* optional
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "kernel32")]
extern "system" {
    fn CreateMailslotA(
        lpName: *const u8,  // LPCSTR
        nMaxMessageSize: u32,  // DWORD
        lReadTimeout: u32,  // DWORD
        lpSecurityAttributes: *mut SECURITY_ATTRIBUTES  // SECURITY_ATTRIBUTES* optional
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern IntPtr CreateMailslotA([MarshalAs(UnmanagedType.LPStr)] string lpName, uint nMaxMessageSize, uint lReadTimeout, IntPtr lpSecurityAttributes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_CreateMailslotA' -Namespace Win32 -PassThru
# $api::CreateMailslotA(lpName, nMaxMessageSize, lReadTimeout, lpSecurityAttributes)

#uselib "KERNEL32.dll"
#func global CreateMailslotA "CreateMailslotA" sptr, sptr, sptr, sptr
; CreateMailslotA lpName, nMaxMessageSize, lReadTimeout, varptr(lpSecurityAttributes)   ; 戻り値は stat
; lpName : LPCSTR -> "sptr"
; nMaxMessageSize : DWORD -> "sptr"
; lReadTimeout : DWORD -> "sptr"
; lpSecurityAttributes : SECURITY_ATTRIBUTES* 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。

#uselib "KERNEL32.dll"
#cfunc global CreateMailslotA "CreateMailslotA" str, int, int, var
; res = CreateMailslotA(lpName, nMaxMessageSize, lReadTimeout, lpSecurityAttributes)
; lpName : LPCSTR -> "str"
; nMaxMessageSize : DWORD -> "int"
; lReadTimeout : DWORD -> "int"
; lpSecurityAttributes : SECURITY_ATTRIBUTES* optional -> "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。

; HANDLE CreateMailslotA(LPCSTR lpName, DWORD nMaxMessageSize, DWORD lReadTimeout, SECURITY_ATTRIBUTES* lpSecurityAttributes)
#uselib "KERNEL32.dll"
#cfunc global CreateMailslotA "CreateMailslotA" str, int, int, var
; res = CreateMailslotA(lpName, nMaxMessageSize, lReadTimeout, lpSecurityAttributes)
; lpName : LPCSTR -> "str"
; nMaxMessageSize : DWORD -> "int"
; lReadTimeout : DWORD -> "int"
; lpSecurityAttributes : SECURITY_ATTRIBUTES* optional -> "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 (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procCreateMailslotA = kernel32.NewProc("CreateMailslotA")
)

// lpName (LPCSTR), nMaxMessageSize (DWORD), lReadTimeout (DWORD), lpSecurityAttributes (SECURITY_ATTRIBUTES* optional)
r1, _, err := procCreateMailslotA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpName))),
	uintptr(nMaxMessageSize),
	uintptr(lReadTimeout),
	uintptr(lpSecurityAttributes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HANDLE

function CreateMailslotA(
  lpName: PAnsiChar;   // LPCSTR
  nMaxMessageSize: DWORD;   // DWORD
  lReadTimeout: DWORD;   // DWORD
  lpSecurityAttributes: Pointer   // SECURITY_ATTRIBUTES* optional
): THandle; stdcall;
  external 'KERNEL32.dll' name 'CreateMailslotA';

result := DllCall("KERNEL32\CreateMailslotA"
    , "AStr", lpName   ; LPCSTR
    , "UInt", nMaxMessageSize   ; DWORD
    , "UInt", lReadTimeout   ; DWORD
    , "Ptr", lpSecurityAttributes   ; SECURITY_ATTRIBUTES* optional
    , "Ptr")   ; return: HANDLE

●CreateMailslotA(lpName, nMaxMessageSize, lReadTimeout, lpSecurityAttributes) = DLL("KERNEL32.dll", "void* CreateMailslotA(char*, dword, dword, void*)")
# 呼び出し: CreateMailslotA(lpName, nMaxMessageSize, lReadTimeout, lpSecurityAttributes)
# lpName : LPCSTR -> "char*"
# nMaxMessageSize : DWORD -> "dword"
# lReadTimeout : DWORD -> "dword"
# lpSecurityAttributes : SECURITY_ATTRIBUTES* 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)。