WlanReasonCodeToString

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

DWORD WlanReasonCodeToString(
    DWORD dwReasonCode,
    DWORD dwBufferSize,
    LPWSTR pStringBuffer,
    void* pReserved   // optional
);

<DllImport("wlanapi.dll", ExactSpelling:=True)>
Public Shared Function WlanReasonCodeToString(
    dwReasonCode As UInteger,   ' DWORD
    dwBufferSize As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pStringBuffer As String,   ' LPWSTR
    pReserved As IntPtr   ' void* optional
) As UInteger
End Function

' dwReasonCode : DWORD
' dwBufferSize : DWORD
' pStringBuffer : LPWSTR
' pReserved : void* optional
Declare PtrSafe Function WlanReasonCodeToString Lib "wlanapi" ( _
    ByVal dwReasonCode As Long, _
    ByVal dwBufferSize As Long, _
    ByVal pStringBuffer As LongPtr, _
    ByVal pReserved 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

WlanReasonCodeToString = ctypes.windll.wlanapi.WlanReasonCodeToString
WlanReasonCodeToString.restype = wintypes.DWORD
WlanReasonCodeToString.argtypes = [
    wintypes.DWORD,  # dwReasonCode : DWORD
    wintypes.DWORD,  # dwBufferSize : DWORD
    wintypes.LPCWSTR,  # pStringBuffer : LPWSTR
    ctypes.POINTER(None),  # pReserved : void* optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('wlanapi.dll')
WlanReasonCodeToString = Fiddle::Function.new(
  lib['WlanReasonCodeToString'],
  [
    -Fiddle::TYPE_INT,  # dwReasonCode : DWORD
    -Fiddle::TYPE_INT,  # dwBufferSize : DWORD
    Fiddle::TYPE_VOIDP,  # pStringBuffer : LPWSTR
    Fiddle::TYPE_VOIDP,  # pReserved : void* optional
  ],
  -Fiddle::TYPE_INT)

#[link(name = "wlanapi")]
extern "system" {
    fn WlanReasonCodeToString(
        dwReasonCode: u32,  // DWORD
        dwBufferSize: u32,  // DWORD
        pStringBuffer: *mut u16,  // LPWSTR
        pReserved: *mut ()  // void* optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("wlanapi.dll")]
public static extern uint WlanReasonCodeToString(uint dwReasonCode, uint dwBufferSize, [MarshalAs(UnmanagedType.LPWStr)] string pStringBuffer, IntPtr pReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'wlanapi_WlanReasonCodeToString' -Namespace Win32 -PassThru
# $api::WlanReasonCodeToString(dwReasonCode, dwBufferSize, pStringBuffer, pReserved)

#uselib "wlanapi.dll"
#func global WlanReasonCodeToString "WlanReasonCodeToString" sptr, sptr, sptr, sptr
; WlanReasonCodeToString dwReasonCode, dwBufferSize, pStringBuffer, pReserved   ; 戻り値は stat
; dwReasonCode : DWORD -> "sptr"
; dwBufferSize : DWORD -> "sptr"
; pStringBuffer : LPWSTR -> "sptr"
; pReserved : void* 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 "wlanapi.dll"
#cfunc global WlanReasonCodeToString "WlanReasonCodeToString" int, int, wstr, sptr
; res = WlanReasonCodeToString(dwReasonCode, dwBufferSize, pStringBuffer, pReserved)
; dwReasonCode : DWORD -> "int"
; dwBufferSize : DWORD -> "int"
; pStringBuffer : LPWSTR -> "wstr"
; pReserved : void* optional -> "sptr"

; DWORD WlanReasonCodeToString(DWORD dwReasonCode, DWORD dwBufferSize, LPWSTR pStringBuffer, void* pReserved)
#uselib "wlanapi.dll"
#cfunc global WlanReasonCodeToString "WlanReasonCodeToString" int, int, wstr, intptr
; res = WlanReasonCodeToString(dwReasonCode, dwBufferSize, pStringBuffer, pReserved)
; dwReasonCode : DWORD -> "int"
; dwBufferSize : DWORD -> "int"
; pStringBuffer : LPWSTR -> "wstr"
; pReserved : void* optional -> "intptr"

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

var (
	wlanapi = windows.NewLazySystemDLL("wlanapi.dll")
	procWlanReasonCodeToString = wlanapi.NewProc("WlanReasonCodeToString")
)

// dwReasonCode (DWORD), dwBufferSize (DWORD), pStringBuffer (LPWSTR), pReserved (void* optional)
r1, _, err := procWlanReasonCodeToString.Call(
	uintptr(dwReasonCode),
	uintptr(dwBufferSize),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pStringBuffer))),
	uintptr(pReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function WlanReasonCodeToString(
  dwReasonCode: DWORD;   // DWORD
  dwBufferSize: DWORD;   // DWORD
  pStringBuffer: PWideChar;   // LPWSTR
  pReserved: Pointer   // void* optional
): DWORD; stdcall;
  external 'wlanapi.dll' name 'WlanReasonCodeToString';

result := DllCall("wlanapi\WlanReasonCodeToString"
    , "UInt", dwReasonCode   ; DWORD
    , "UInt", dwBufferSize   ; DWORD
    , "WStr", pStringBuffer   ; LPWSTR
    , "Ptr", pReserved   ; void* optional
    , "UInt")   ; return: DWORD

●WlanReasonCodeToString(dwReasonCode, dwBufferSize, pStringBuffer, pReserved) = DLL("wlanapi.dll", "dword WlanReasonCodeToString(dword, dword, char*, void*)")
# 呼び出し: WlanReasonCodeToString(dwReasonCode, dwBufferSize, pStringBuffer, pReserved)
# dwReasonCode : DWORD -> "dword"
# dwBufferSize : DWORD -> "dword"
# pStringBuffer : LPWSTR -> "char*"
# pReserved : void* 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)。