Образец ICMP-ping

Const SOCKET_ERROR = 0
 
Private Type WSAdata
    wVersion As Integer
    wHighVersion As Integer
    szDescription(0 To 255) As Byte
    szSystemStatus(0 To 128) As Byte
    iMaxSockets As Integer
    iMaxUdpDg As Integer
    lpVendorInfo As Long
End Type
 
Private Type Hostent
    h_name As Long
    h_aliases As Long
    h_addrtype As Integer
    h_length As Integer
    h_addr_list As Long
End Type
 
Private Type IP_OPTION_INFORMATION
    TTL As Byte
    Tos As Byte
    Flags As Byte
    OptionsSize As Long
    OptionsData As String * 128
End Type
 
Private Type IP_ECHO_REPLY
    Address(0 To 3) As Byte
    Status As Long
    RoundTripTime As Long
    DataSize As Integer
    Reserved As Integer
    data As Long
    Options As IP_OPTION_INFORMATION
End Type
 
Private Declare Function GetHostByName Lib 'wsock32.dll' _
Alias 'gethostbyname' _
(ByVal HostName As String) As Long
 
Private Declare Function WSAStartup Lib 'wsock32.dll' _
(ByVal wVersionRequired&, _
lpWSAdata As WSAdata) As Long
 
Private Declare Function WSACleanup Lib 'wsock32.dll' () As Long
 
Private Declare Sub CopyMemory Lib 'kernel32' _
Alias 'RtlMoveMemory' _
(hpvDest As Any, _
hpvSource As Any, _
ByVal cbCopy As Long)
 
Private Declare Function IcmpCreateFile Lib 'icmp.dll' () As Long
 
Private Declare Function IcmpCloseHandle Lib 'icmp.dll' _
(ByVal HANDLE As Long) As Boolean
 
Private Declare Function IcmpSendEcho Lib 'ICMP' _
(ByVal IcmpHandle As Long, _
ByVal DestAddress As Long, _
ByVal RequestData As String, _
ByVal RequestSize As Integer, _
RequestOptns As IP_OPTION_INFORMATION, _
ReplyBuffer As IP_ECHO_REPLY, _
ByVal ReplySize As Long, _
ByVal TimeOut As Long) As Boolean
 
Private Sub Form_Load()
    Const HostName = 'www.geocities.com'
    Dim hFile As Long, lpWSAdata As WSAdata
    Dim hHostent As Hostent, AddrList As Long
    Dim Address As Long, rIP As String
    Dim OptInfo As IP_OPTION_INFORMATION
    Dim EchoReply As IP_ECHO_REPLY
    Call WSAStartup(&H101, lpWSAdata)
    If GetHostByName(HostName + String(64 - _
Len(HostName), 0)) <> SOCKET_ERROR Then
        CopyMemory hHostent.h_name, _
ByVal GetHostByName(HostName + _
String(64 - Len(HostName), 0)), _
Len(hHostent)
        CopyMemory AddrList, ByVal hHostent.h_addr_list, 4
        CopyMemory Address, ByVal AddrList, 4
    End If
    hFile = IcmpCreateFile()
    If hFile = 0 Then
        MsgBox 'Unable to Create File Handle'
        Exit Sub
    End If
    OptInfo.TTL = 255
    If IcmpSendEcho(hFile, Address, _
String(32, 'A'), 32, _
OptInfo, EchoReply, _
Len(EchoReply) + 8, 2000) Then
        rIP = CStr(EchoReply.Address(0)) + '.' + _
CStr(EchoReply.Address(1)) + '.' + _
CStr(EchoReply.Address(2)) + '.' + _
CStr(EchoReply.Address(3))
    Else
        MsgBox 'Timeout'
    End If
    If EchoReply.Status = 0 Then
        MsgBox 'Reply from ' + HostName + _
' (' + rIP + ') recieved after ' + _
Trim$(CStr(EchoReply.RoundTripTime)) + 'ms'
    Else
        MsgBox 'Failure

If GetHostByName(HostName + String(64 - _
Len(HostName), 0)) <> SOCKET_ERROR Then
CopyMemory hHostent.h_name, _
ByVal GetHostByName(HostName + _
String(64 - Len(HostName), 0)), _
Len(hHostent)
...