InternetGetConnectedState

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

BOOL InternetGetConnectedState(
    INTERNET_CONNECTION* lpdwFlags,
    DWORD dwReserved   // optional
);

<DllImport("WININET.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function InternetGetConnectedState(
    <Out> ByRef lpdwFlags As UInteger,   ' INTERNET_CONNECTION* out
    dwReserved As UInteger   ' DWORD optional
) As Boolean
End Function

' lpdwFlags : INTERNET_CONNECTION* out
' dwReserved : DWORD optional
Declare PtrSafe Function InternetGetConnectedState Lib "wininet" ( _
    ByRef lpdwFlags As Long, _
    ByVal dwReserved As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

InternetGetConnectedState = ctypes.windll.wininet.InternetGetConnectedState
InternetGetConnectedState.restype = wintypes.BOOL
InternetGetConnectedState.argtypes = [
    ctypes.c_void_p,  # lpdwFlags : INTERNET_CONNECTION* out
    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')
InternetGetConnectedState = Fiddle::Function.new(
  lib['InternetGetConnectedState'],
  [
    Fiddle::TYPE_VOIDP,  # lpdwFlags : INTERNET_CONNECTION* out
    -Fiddle::TYPE_INT,  # dwReserved : DWORD optional
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WININET.dll", SetLastError = true)]
public static extern bool InternetGetConnectedState(out uint lpdwFlags, uint dwReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_InternetGetConnectedState' -Namespace Win32 -PassThru
# $api::InternetGetConnectedState(lpdwFlags, dwReserved)

#uselib "WININET.dll"
#func global InternetGetConnectedState "InternetGetConnectedState" sptr, sptr
; InternetGetConnectedState lpdwFlags, dwReserved   ; 戻り値は stat
; lpdwFlags : INTERNET_CONNECTION* out -> "sptr"
; dwReserved : DWORD 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 "WININET.dll"
#cfunc global InternetGetConnectedState "InternetGetConnectedState" int, int
; res = InternetGetConnectedState(lpdwFlags, dwReserved)
; lpdwFlags : INTERNET_CONNECTION* out -> "int"
; dwReserved : DWORD optional -> "int"

; BOOL InternetGetConnectedState(INTERNET_CONNECTION* lpdwFlags, DWORD dwReserved)
#uselib "WININET.dll"
#cfunc global InternetGetConnectedState "InternetGetConnectedState" int, int
; res = InternetGetConnectedState(lpdwFlags, dwReserved)
; lpdwFlags : INTERNET_CONNECTION* out -> "int"
; dwReserved : DWORD optional -> "int"

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

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procInternetGetConnectedState = wininet.NewProc("InternetGetConnectedState")
)

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

function InternetGetConnectedState(
  lpdwFlags: Pointer;   // INTERNET_CONNECTION* out
  dwReserved: DWORD   // DWORD optional
): BOOL; stdcall;
  external 'WININET.dll' name 'InternetGetConnectedState';

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

●InternetGetConnectedState(lpdwFlags, dwReserved) = DLL("WININET.dll", "bool InternetGetConnectedState(void*, dword)")
# 呼び出し: InternetGetConnectedState(lpdwFlags, dwReserved)
# lpdwFlags : INTERNET_CONNECTION* out -> "void*"
# 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)。