InternetCheckConnectionA

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

BOOL InternetCheckConnectionA(
    LPCSTR lpszUrl,
    DWORD dwFlags,
    DWORD dwReserved
);

<DllImport("WININET.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function InternetCheckConnectionA(
    <MarshalAs(UnmanagedType.LPStr)> lpszUrl As String,   ' LPCSTR
    dwFlags As UInteger,   ' DWORD
    dwReserved As UInteger   ' DWORD
) As Boolean
End Function

' lpszUrl : LPCSTR
' dwFlags : DWORD
' dwReserved : DWORD
Declare PtrSafe Function InternetCheckConnectionA Lib "wininet" ( _
    ByVal lpszUrl As String, _
    ByVal dwFlags 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

InternetCheckConnectionA = ctypes.windll.wininet.InternetCheckConnectionA
InternetCheckConnectionA.restype = wintypes.BOOL
InternetCheckConnectionA.argtypes = [
    wintypes.LPCSTR,  # lpszUrl : LPCSTR
    wintypes.DWORD,  # dwFlags : DWORD
    wintypes.DWORD,  # dwReserved : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
InternetCheckConnectionA = Fiddle::Function.new(
  lib['InternetCheckConnectionA'],
  [
    Fiddle::TYPE_VOIDP,  # lpszUrl : LPCSTR
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    -Fiddle::TYPE_INT,  # dwReserved : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "wininet")]
extern "system" {
    fn InternetCheckConnectionA(
        lpszUrl: *const u8,  // LPCSTR
        dwFlags: u32,  // DWORD
        dwReserved: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WININET.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool InternetCheckConnectionA([MarshalAs(UnmanagedType.LPStr)] string lpszUrl, uint dwFlags, uint dwReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_InternetCheckConnectionA' -Namespace Win32 -PassThru
# $api::InternetCheckConnectionA(lpszUrl, dwFlags, dwReserved)

#uselib "WININET.dll"
#func global InternetCheckConnectionA "InternetCheckConnectionA" sptr, sptr, sptr
; InternetCheckConnectionA lpszUrl, dwFlags, dwReserved   ; 戻り値は stat
; lpszUrl : LPCSTR -> "sptr"
; dwFlags : DWORD -> "sptr"
; dwReserved : DWORD -> "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 InternetCheckConnectionA "InternetCheckConnectionA" str, int, int
; res = InternetCheckConnectionA(lpszUrl, dwFlags, dwReserved)
; lpszUrl : LPCSTR -> "str"
; dwFlags : DWORD -> "int"
; dwReserved : DWORD -> "int"

; BOOL InternetCheckConnectionA(LPCSTR lpszUrl, DWORD dwFlags, DWORD dwReserved)
#uselib "WININET.dll"
#cfunc global InternetCheckConnectionA "InternetCheckConnectionA" str, int, int
; res = InternetCheckConnectionA(lpszUrl, dwFlags, dwReserved)
; lpszUrl : LPCSTR -> "str"
; dwFlags : DWORD -> "int"
; dwReserved : DWORD -> "int"

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

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procInternetCheckConnectionA = wininet.NewProc("InternetCheckConnectionA")
)

// lpszUrl (LPCSTR), dwFlags (DWORD), dwReserved (DWORD)
r1, _, err := procInternetCheckConnectionA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpszUrl))),
	uintptr(dwFlags),
	uintptr(dwReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function InternetCheckConnectionA(
  lpszUrl: PAnsiChar;   // LPCSTR
  dwFlags: DWORD;   // DWORD
  dwReserved: DWORD   // DWORD
): BOOL; stdcall;
  external 'WININET.dll' name 'InternetCheckConnectionA';

result := DllCall("WININET\InternetCheckConnectionA"
    , "AStr", lpszUrl   ; LPCSTR
    , "UInt", dwFlags   ; DWORD
    , "UInt", dwReserved   ; DWORD
    , "Int")   ; return: BOOL

●InternetCheckConnectionA(lpszUrl, dwFlags, dwReserved) = DLL("WININET.dll", "bool InternetCheckConnectionA(char*, dword, dword)")
# 呼び出し: InternetCheckConnectionA(lpszUrl, dwFlags, dwReserved)
# lpszUrl : LPCSTR -> "char*"
# dwFlags : DWORD -> "dword"
# dwReserved : DWORD -> "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)。