I Have a vb6 code which is used to test whether internet connection is there or not for a PC.I make use of checking google DNS for it.It works fine in Windows XP.But in Windows 8 if internet is connected or not it always returns success(Internet is connected). I am making use of Below is part of coding
And below is ping procedure
It is only a part of coding(I do pass parameters properly such as sAddress with DNS of google etc).Now i have observed that when internet connection is there in windows xp ping = Reply.Status returns 0 (which is for success).Same is the case in Windows 8 also.But when internet connection is not there windows xp returns ping value as 11003(which means no internet connection).But in windows 8 it still returns 0 which is for success.
So i think it is problem with IcmpSendEcho function which returns wrong value
i have defined following also
Hint:also in link IcmpSendEcho IP_OPTION_INFORMATION for 64 bit pc is different etc.. etc..
So please help me to solve the problem
Code:
Private Function CheckForInternet(ByVal ServerIP As String, ByRef IsTimedOut As Boolean) A
s Boolean
On Error GoTo CheckForInternet_EH
Dim Reply As ICMP_ECHO_REPLY
Dim lngSuccess As Long
Dim strIPAddress As String
Dim a As String
Dim startTimer As Single
Dim EndTimer As Single
Const Time_out_in_ms As Integer = 1000
'Get the sockets ready.
If SocketsInitialize() Then
'Address to ping
strIPAddress = ServerIP
'Ping the IP that is passing the address and get a reply.
lngSuccess = ping(strIPAddress, Time_out_in_ms, Reply)
'Clean up the sockets.
SocketsCleanup
''Return Value
If lngSuccess = ICMP_SUCCESS Then
CheckForInternet = True
ElseIf lngSuccess = ICMP_STATUS_REQUEST_TIMED_OUT Then
IsTimedOut = True
End If
'Else
' 'Winsock error failure, initializing the sockets.
' Debug.Print WINSOCK_ERROR
End If
Exit Function
CheckForInternet_EH:
Call msglog(Err.Description & Space(10) & "CheckForInternet", False)
End FunctionCode:
Public Function ping(ByVal sAddress As String, ByVal time_out As Long, Reply As ICMP_ECHO_REPLY) As Long
On Error GoTo ping_EH
Dim hIcmp As Long
Dim lAddress As Long
Dim lTimeOut As Long
Dim StringToSend As String
'Short string of data to send
StringToSend = "hello"
'ICMP (ping) timeout
lTimeOut = time_out ''ms
'Convert string address to a long representation.
lAddress = inet_addr(sAddress)
If (lAddress <> -1) And (lAddress <> 0) Then
'Create the handle for ICMP requests.
hIcmp = IcmpCreateFile()
If hIcmp Then
'Ping the destination IP address.
Call IcmpSendEcho(hIcmp, lAddress, StringToSend, Len(StringToSend), 0, Reply, Len(Reply), lTimeOut)
'Reply status
ping = Reply.Status
'Close the Icmp handle.
IcmpCloseHandle hIcmp
Else
'Debug.Print "failure opening icmp handle."
ping = -1
End If
Else
ping = -1
End If
Exit Function
ping_EH:
Call msglog(Err.Description & Space(10) & "ping", False)
End FunctionSo i think it is problem with IcmpSendEcho function which returns wrong value
i have defined following also
Code:
Private Declare Function IcmpSendEcho Lib "icmp.dll" _
(ByVal IcmpHandle As Long, _
ByVal DestinationAddress As Long, _
ByVal RequestData As String, _
ByVal RequestSize As Long, _
ByVal RequestOptions As Long, _
ReplyBuffer As ICMP_ECHO_REPLY, _
ByVal ReplySize As Long, _
ByVal Timeout As Long) As Long
'This structure describes the options that will be included in the header of an IP packet.
'http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcetcpip/htm/cerefIP_OPTION_INFORMATION.asp
Private Type IP_OPTION_INFORMATION
Ttl As Byte
Tos As Byte
Flags As Byte
OptionsSize As Byte
OptionsData As Long
End Type
'This structure describes the data that is returned in response to an echo request.
'http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcesdkr/htm/_wcesdk_icmp_echo_reply.asp
Public Type ICMP_ECHO_REPLY
address As Long
Status As Long
RoundTripTime As Long
DataSize As Long
Reserved As Integer
ptrData As Long
Options As IP_OPTION_INFORMATION
Data As String * 250
End TypeHint:also in link IcmpSendEcho IP_OPTION_INFORMATION for 64 bit pc is different etc.. etc..
So please help me to solve the problem