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IsNetworkAlive

関数

ネットワーク接続が利用可能かを判定する。

DLLSensApi.dll呼出規約winapiSetLastErrorあり対応OSWindows XP 以降

シグネチャ

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

BOOL IsNetworkAlive(
    DWORD* lpdwFlags
);

パラメーター

名前	型	方向
lpdwFlags	DWORD*	inout

戻り値の型: BOOL

各言語での呼び出し定義

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

BOOL IsNetworkAlive(
    DWORD* lpdwFlags
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("SensApi.dll", SetLastError = true, ExactSpelling = true)]
static extern bool IsNetworkAlive(
    ref uint lpdwFlags   // DWORD* in/out
);

<DllImport("SensApi.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function IsNetworkAlive(
    ByRef lpdwFlags As UInteger   ' DWORD* in/out
) As Boolean
End Function

' lpdwFlags : DWORD* in/out
Declare PtrSafe Function IsNetworkAlive Lib "sensapi" ( _
    ByRef lpdwFlags 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

IsNetworkAlive = ctypes.windll.sensapi.IsNetworkAlive
IsNetworkAlive.restype = wintypes.BOOL
IsNetworkAlive.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # lpdwFlags : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SensApi.dll')
IsNetworkAlive = Fiddle::Function.new(
  lib['IsNetworkAlive'],
  [
    Fiddle::TYPE_VOIDP,  # lpdwFlags : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

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

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

#uselib "SensApi.dll"
#func global IsNetworkAlive "IsNetworkAlive" sptr
; IsNetworkAlive varptr(lpdwFlags)   ; 戻り値は stat
; lpdwFlags : DWORD* in/out -> "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。

出力引数:

#uselib "SensApi.dll"
#cfunc global IsNetworkAlive "IsNetworkAlive" var
; res = IsNetworkAlive(lpdwFlags)
; lpdwFlags : DWORD* in/out -> "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。#uselib "SensApi.dll"
#cfunc global IsNetworkAlive "IsNetworkAlive" sptr
; res = IsNetworkAlive(varptr(lpdwFlags))
; lpdwFlags : DWORD* in/out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; BOOL IsNetworkAlive(DWORD* lpdwFlags)
#uselib "SensApi.dll"
#cfunc global IsNetworkAlive "IsNetworkAlive" var
; res = IsNetworkAlive(lpdwFlags)
; lpdwFlags : DWORD* in/out -> "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。; BOOL IsNetworkAlive(DWORD* lpdwFlags)
#uselib "SensApi.dll"
#cfunc global IsNetworkAlive "IsNetworkAlive" intptr
; res = IsNetworkAlive(varptr(lpdwFlags))
; lpdwFlags : DWORD* in/out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	sensapi = windows.NewLazySystemDLL("SensApi.dll")
	procIsNetworkAlive = sensapi.NewProc("IsNetworkAlive")
)

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

function IsNetworkAlive(
  lpdwFlags: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'SensApi.dll' name 'IsNetworkAlive';

result := DllCall("SensApi\IsNetworkAlive"
    , "Ptr", lpdwFlags   ; DWORD* in/out
    , "Int")   ; return: BOOL

●IsNetworkAlive(lpdwFlags) = DLL("SensApi.dll", "bool IsNetworkAlive(void*)")
# 呼び出し: IsNetworkAlive(lpdwFlags)
# lpdwFlags : DWORD* in/out -> "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)。