IPアドレス文字列（例:192.168.10.1)をコード値に変換したり、コード値からIPアドレス文字列に変換するサンプル
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| Option Explicit | |
| Private Const WSADESCRIPTION_LEN As Integer = 256 | |
| Private Const WSASYS_STATUS_LEN As Integer = 128 | |
| Private Type WSAData | |
| wVersion As Integer | |
| wHighVersion As Integer | |
| szDescription(0 To WSADESCRIPTION_LEN) As Byte | |
| szSystemStatus(0 To WSADESCRIPTION_LEN) As Byte | |
| iMaxSockets As Integer | |
| iMaxUDPDG As Integer | |
| lpVendorInfo As Long | |
| End Type | |
| Public Const AF_INET As Integer = 2 | |
| Public Const AF_INET6 As Integer = 23 | |
| Private Declare PtrSafe Function WSAStartup Lib "wsock32.dll" (ByVal wVersionRequested As Integer, lpWSADATA As Any) As Long | |
| Private Declare PtrSafe Function WSACleanup Lib "wsock32.dll" () As Long | |
| 'IPv4またはIPv6インターネットネットワークアドレスからインターネット標準形式の文字列に変換 | |
| Private Declare PtrSafe Function inet_addr Lib "Ws2_32.dll" (ByVal cp As String) As Long | |
| 'IPv4またはIPv6インターネットネットワークアドレスからインターネット標準形式の文字列に変換 | |
| Private Declare PtrSafe Function InetNtopW Lib "Ws2_32.dll" (ByVal Family As Integer, ByRef pAddr As Long, ByVal pStringBuf As String, ByVal StringBufSize As Integer) As Long | |
| Public Function IPアドレス変換_逆変換サンプル() As String | |
| Dim WSA As WSAData | |
| Dim sName As String | |
| Dim RetCode As Long | |
| RetCode = WSAStartup(MAKEWORD(2, 2), WSA) | |
| If (RetCode <> 0) Then | |
| Call WSACleanup | |
| Exit Function | |
| End If | |
| Dim s As String * 128 | |
| s = String(100, vbNullChar) | |
| Dim s2 As String | |
| Dim i As Long | |
| 'サンプル１ IPネットワークアドレス（文字列）からネットワークアドレスへ | |
| i = inet_addr("192.168.10.1") | |
| Debug.Print "inet_addr:" & i | |
| 'サンプル２ ネットワークアドレスからIPネットワークアドレス（文字列）へ変換 | |
| Call InetNtopW(AF_INET, i, s, 128) | |
| s2 = Replace(s, vbNullChar, "") | |
| Debug.Print "IPv4アドレス：" & s2 | |
| 'サンプル３ IPv6ネットワークアドレスもIPv6ネットワークアドレス（文字列）へ変換可能のようだ | |
| Call InetNtopW(AF_INET6, i, s, 128) | |
| s2 = Replace(s, vbNullChar, "") | |
| Debug.Print "IPv6アドレス：" & s2 | |
| Call WSACleanup | |
| End Function | |
| Public Function MAKEWORD(Lo As Byte, Hi As Byte) As Integer | |
| MAKEWORD = Lo + Hi * 256& Or 32768 * (Hi > 127) | |
| End Function | |
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