InternetGetConnectedStateExW

// WININET.dll  (Unicode / -W)
#include <windows.h>

BOOL InternetGetConnectedStateExW(
    INTERNET_CONNECTION* lpdwFlags,   // optional
    LPWSTR lpszConnectionName,   // optional
    DWORD cchNameLen,
    DWORD dwReserved   // optional
);

<DllImport("WININET.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function InternetGetConnectedStateExW(
    lpdwFlags As IntPtr,   ' INTERNET_CONNECTION* optional, out
    <MarshalAs(UnmanagedType.LPWStr)> lpszConnectionName As System.Text.StringBuilder,   ' LPWSTR optional, out
    cchNameLen As UInteger,   ' DWORD
    dwReserved As UInteger   ' DWORD optional
) As Boolean
End Function

' lpdwFlags : INTERNET_CONNECTION* optional, out
' lpszConnectionName : LPWSTR optional, out
' cchNameLen : DWORD
' dwReserved : DWORD optional
Declare PtrSafe Function InternetGetConnectedStateExW Lib "wininet" ( _
    ByVal lpdwFlags As LongPtr, _
    ByVal lpszConnectionName As LongPtr, _
    ByVal cchNameLen As Long, _
    ByVal dwReserved As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

InternetGetConnectedStateExW = ctypes.windll.wininet.InternetGetConnectedStateExW
InternetGetConnectedStateExW.restype = wintypes.BOOL
InternetGetConnectedStateExW.argtypes = [
    ctypes.c_void_p,  # lpdwFlags : INTERNET_CONNECTION* optional, out
    wintypes.LPWSTR,  # lpszConnectionName : LPWSTR optional, out
    wintypes.DWORD,  # cchNameLen : DWORD
    wintypes.DWORD,  # dwReserved : DWORD optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
InternetGetConnectedStateExW = Fiddle::Function.new(
  lib['InternetGetConnectedStateExW'],
  [
    Fiddle::TYPE_VOIDP,  # lpdwFlags : INTERNET_CONNECTION* optional, out
    Fiddle::TYPE_VOIDP,  # lpszConnectionName : LPWSTR optional, out
    -Fiddle::TYPE_INT,  # cchNameLen : DWORD
    -Fiddle::TYPE_INT,  # dwReserved : DWORD optional
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "wininet")]
extern "system" {
    fn InternetGetConnectedStateExW(
        lpdwFlags: *mut u32,  // INTERNET_CONNECTION* optional, out
        lpszConnectionName: *mut u16,  // LPWSTR optional, out
        cchNameLen: u32,  // DWORD
        dwReserved: u32  // DWORD optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WININET.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool InternetGetConnectedStateExW(IntPtr lpdwFlags, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpszConnectionName, uint cchNameLen, uint dwReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_InternetGetConnectedStateExW' -Namespace Win32 -PassThru
# $api::InternetGetConnectedStateExW(lpdwFlags, lpszConnectionName, cchNameLen, dwReserved)

#uselib "WININET.dll"
#func global InternetGetConnectedStateExW "InternetGetConnectedStateExW" wptr, wptr, wptr, wptr
; InternetGetConnectedStateExW lpdwFlags, varptr(lpszConnectionName), cchNameLen, dwReserved   ; 戻り値は stat
; lpdwFlags : INTERNET_CONNECTION* optional, out -> "wptr"
; lpszConnectionName : LPWSTR optional, out -> "wptr"
; cchNameLen : DWORD -> "wptr"
; dwReserved : DWORD optional -> "wptr"
; ※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 "WININET.dll"
#cfunc global InternetGetConnectedStateExW "InternetGetConnectedStateExW" int, var, int, int
; res = InternetGetConnectedStateExW(lpdwFlags, lpszConnectionName, cchNameLen, dwReserved)
; lpdwFlags : INTERNET_CONNECTION* optional, out -> "int"
; lpszConnectionName : LPWSTR optional, out -> "var"
; cchNameLen : DWORD -> "int"
; dwReserved : DWORD optional -> "int"
; ※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。

; BOOL InternetGetConnectedStateExW(INTERNET_CONNECTION* lpdwFlags, LPWSTR lpszConnectionName, DWORD cchNameLen, DWORD dwReserved)
#uselib "WININET.dll"
#cfunc global InternetGetConnectedStateExW "InternetGetConnectedStateExW" int, var, int, int
; res = InternetGetConnectedStateExW(lpdwFlags, lpszConnectionName, cchNameLen, dwReserved)
; lpdwFlags : INTERNET_CONNECTION* optional, out -> "int"
; lpszConnectionName : LPWSTR optional, out -> "var"
; cchNameLen : DWORD -> "int"
; dwReserved : DWORD optional -> "int"
; ※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 (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procInternetGetConnectedStateExW = wininet.NewProc("InternetGetConnectedStateExW")
)

// lpdwFlags (INTERNET_CONNECTION* optional, out), lpszConnectionName (LPWSTR optional, out), cchNameLen (DWORD), dwReserved (DWORD optional)
r1, _, err := procInternetGetConnectedStateExW.Call(
	uintptr(lpdwFlags),
	uintptr(lpszConnectionName),
	uintptr(cchNameLen),
	uintptr(dwReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function InternetGetConnectedStateExW(
  lpdwFlags: Pointer;   // INTERNET_CONNECTION* optional, out
  lpszConnectionName: PWideChar;   // LPWSTR optional, out
  cchNameLen: DWORD;   // DWORD
  dwReserved: DWORD   // DWORD optional
): BOOL; stdcall;
  external 'WININET.dll' name 'InternetGetConnectedStateExW';

result := DllCall("WININET\InternetGetConnectedStateExW"
    , "Ptr", lpdwFlags   ; INTERNET_CONNECTION* optional, out
    , "Ptr", lpszConnectionName   ; LPWSTR optional, out
    , "UInt", cchNameLen   ; DWORD
    , "UInt", dwReserved   ; DWORD optional
    , "Int")   ; return: BOOL

●InternetGetConnectedStateExW(lpdwFlags, lpszConnectionName, cchNameLen, dwReserved) = DLL("WININET.dll", "bool InternetGetConnectedStateExW(void*, char*, dword, dword)")
# 呼び出し: InternetGetConnectedStateExW(lpdwFlags, lpszConnectionName, cchNameLen, dwReserved)
# lpdwFlags : INTERNET_CONNECTION* optional, out -> "void*"
# lpszConnectionName : LPWSTR optional, out -> "char*"
# cchNameLen : DWORD -> "dword"
# dwReserved : DWORD optional -> "dword"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。