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Check that your computer is connected to internet even on Lan environment

Check that your computer is connected to internet even on Lan environment

API Declarations



Private Const WS_VERSION_REQD = &H101
Private Const WS_VERSION_MAJOR = WS_VERSION_REQD \ &H100 And &HFF&
Private Const WS_VERSION_MINOR = WS_VERSION_REQD And &HFF&
Private Const MIN_SOCKETS_REQD = 1
Private Const SOCKET_ERROR = -1
Private Const WSADescription_Len = 256
Private Const WSASYS_Status_Len = 128

Private Type HOSTENT
hName As Long
hAliases As Long
hAddrType As Integer
hLength As Integer
hAddrList As Long
End Type

Private Type WSADATA
wversion As Integer
wHighVersion As Integer
szDescription(0 To WSADescription_Len) As Byte
szSystemStatus(0 To WSASYS_Status_Len) As Byte
iMaxSockets As Integer
iMaxUdpDg As Integer
lpszVendorInfo As Long
End Type

Private Declare Function WSAGetLastError Lib "WSOCK32.DLL" () 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 Function gethostbyname Lib "WSOCK32.DLL" (ByVal hostname$) As Long
Private Declare Sub RtlMoveMemory Lib "KERNEL32" (hpvDest As Any, ByVal hpvSource&, ByVal cbCopy&)

' add a command button command1




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(2(2 Vote))

'then It means that you are connected

Function hibyte(ByVal wParam As Integer)
   
   hibyte = wParam \ &H100 And &HFF&
   
End Function

Function lobyte(ByVal wParam As Integer)
   
   lobyte = wParam And &HFF&
   
End Function

Sub SocketsInitialize()
   
   Dim WSAD As WSADATA
   Dim iReturn As Integer
   Dim sLowByte As String, sHighByte As String, sMsg As String
   
   iReturn = WSAStartup(WS_VERSION_REQD, WSAD)
   
   If iReturn <> 0 Then
      MsgBox "Winsock.dll is not responding."
      End
   End If
   
   If lobyte(WSAD.wversion) < WS_VERSION_MAJOR Or (lobyte(WSAD.wversion) = WS_VERSION_MAJOR And hibyte(WSAD.wversion) < WS_VERSION_MINOR) Then
      sHighByte = Trim$(Str$(hibyte(WSAD.wversion)))
      sLowByte = Trim$(Str$(lobyte(WSAD.wversion)))
      sMsg = "Windows Sockets version " & sLowByte & "." & sHighByte
      sMsg = sMsg & " is not supported by winsock.dll "
      MsgBox sMsg
      End
   End If
   
   If WSAD.iMaxSockets < MIN_SOCKETS_REQD Then
      sMsg = "This application requires a minimum of "
      sMsg = sMsg & Trim$(Str$(MIN_SOCKETS_REQD)) & " supported sockets."
      MsgBox sMsg
      End
   End If
   
End Sub

Sub SocketsCleanup()
   Dim lReturn As Long
   
   lReturn = WSACleanup()
   
   If lReturn <> 0 Then
      MsgBox "Socket error " & Trim$(Str$(lReturn)) & " occurred in Cleanup "
      End
   End If
   
End Sub

Private Sub Command1_Click()
    If isConnected = True Then
        MsgBox "connected"
    Else
        MsgBox "not connected"
    End If
End Sub

Sub Form_Load()
   
   SocketsInitialize
   
End Sub

Private Sub Form_Unload(Cancel As Integer)
   
   SocketsCleanup
   
End Sub

Private Function isConnected() As Boolean
   Dim hostent_addr As Long
   Dim host As HOSTENT
   Dim hostip_addr As Long
   Dim temp_ip_address() As Byte
   Dim i As Integer
   Dim ip_address As String
   
   hostent_addr = gethostbyname("www.yahoo.com")
   
   If hostent_addr = 0 Then
     isConnected = False
      Exit Function
   End If
   
   RtlMoveMemory host, hostent_addr, LenB(host)
   RtlMoveMemory hostip_addr, host.hAddrList, 4
   
   ReDim temp_ip_address(1 To host.hLength)
   RtlMoveMemory temp_ip_address(1), hostip_addr, host.hLength
   
   For i = 1 To host.hLength
      ip_address = ip_address & temp_ip_address(i) & "."
   Next
   ip_address = Mid$(ip_address, 1, Len(ip_address) - 1)
   
    If IsNumeric(Mid$(ip_address, 1, 1)) Then
        isConnected = True
    Else
        isConnected = False
    End If
  
   
End Function