Bandwidth calculation (Internet data transfer) - vb.net

Question

I have used the following code to get bandwidth
It works but i have following doubts
1.I need Total Internet Data transferred in MB, how do i convert?, total data transferred (download+upload) varies with other bandwidth monitoring applications. how do i get exact data transferred?
2.I need to exclude file transfer in local LAN in Data Transfer, The follwoing method includes internet data transfer + Local file transfer
Option Explicit
Public Enum OperationalStates
MIB_IF_OPER_STATUS_NON_OPERATIONAL = 0
MIB_IF_OPER_STATUS_UNREACHABLE = 1
MIB_IF_OPER_STATUS_DISCONNECTED = 2
MIB_IF_OPER_STATUS_CONNECTING = 3
MIB_IF_OPER_STATUS_CONNECTED = 4
MIB_IF_OPER_STATUS_OPERATIONAL = 5
End Enum
Public Enum InterfaceTypes
MIB_IF_TYPE_OTHER = 1
MIB_IF_TYPE_ETHERNET = 6
MIB_IF_TYPE_TOKENRING = 9
MIB_IF_TYPE_FDDI = 15
MIB_IF_TYPE_PPP = 23
MIB_IF_TYPE_LOOPBACK = 24
MIB_IF_TYPE_SLIP = 28
End Enum
Public Enum AdminStatuses
MIB_IF_ADMIN_STATUS_UP = 1
MIB_IF_ADMIN_STATUS_DOWN = 2
MIB_IF_ADMIN_STATUS_TESTING = 3
End Enum
Private Const MAXLEN_IFDESCR As Integer = 256
Private Const MAXLEN_PHYSADDR As Integer = 8
Private Const MAX_INTERFACE_NAME_LEN As Integer = 256
Private Const ERROR_NOT_SUPPORTED As Long = 50
Private Const ERROR_SUCCESS As Long = 0
Private Type MIB_IFROW
wszName(0 To 511) As Byte
dwIndex As Long '// index of the interface
dwType As Long '// type of interface
dwMtu As Long '// max transmission unit
dwSpeed As Long '// speed of the interface
dwPhysAddrLen As Long '// length of physical address
bPhysAddr(0 To 7) As Byte '// physical address of adapter
dwAdminStatus As Long '// administrative status
dwOperStatus As Long '// operational status
dwLastChange As Long
dwInOctets As Long '// octets received
dwInUcastPkts As Long '// unicast packets received
dwInNUcastPkts As Long '// non-unicast packets received
dwInDiscards As Long '// received packets discarded
dwInErrors As Long '// erroneous packets received
dwInUnknownProtos As Long
dwOutOctets As Long '// octets sent
dwOutUcastPkts As Long '// unicast packets sent
dwOutNUcastPkts As Long '// non-unicast packets sent
dwOutDiscards As Long '// outgoing packets discarded
dwOutErrors As Long '// erroneous packets sent
dwOutQLen As Long '// output queue length
dwDescrLen As Long '// length of bDescr member
bDescr(0 To 255) As Byte '// interface description
End Type
Private m_lngBytesReceived As Long
Private m_lngBytesSent As Long
Private Declare Function GetIfTable _
Lib "IPhlpAPI" (ByRef pIfRowTable As Any, _
ByRef pdwSize As Long, _
ByVal bOrder As Long) As Long
Private Declare Sub CopyMemory _
Lib "kernel32" _
Alias "RtlMoveMemory" (ByRef pDest As Any, _
ByRef pSource As Any, _
ByVal Length As Long)
Private Declare Function FreeResource Lib "kernel32" (ByVal hResData As Long) As Long
Public Property Get BytesReceived() As Long
BytesReceived = m_lngBytesReceived
End Property
Public Property Get BytesSent() As Long
BytesSent = m_lngBytesSent
End Property
Public Function InitInterfaces() As Boolean
Dim arrBuffer() As Byte
Dim lngSize As Long
Dim lngRetVal As Long
Dim Name As String
Dim lngRows As Long
Dim lngRow As Long
Dim i As Integer
Dim j As Integer
Dim IfRowTable As MIB_IFROW
On Error GoTo err
lngSize = 0
m_lngBytesReceived = 0
m_lngBytesSent = 0
lngRetVal = GetIfTable(ByVal 0&, lngSize, 0)
If lngRetVal = ERROR_NOT_SUPPORTED Then
Exit Function
End If
ReDim arrBuffer(0 To lngSize - 1) As Byte
lngRetVal = GetIfTable(arrBuffer(0), lngSize, 0)
If lngRetVal = ERROR_SUCCESS Then
CopyMemory lngRows, arrBuffer(0), 4
If lngRows >= 1 Then
For lngRow = 1 To lngRows
CopyMemory IfRowTable, arrBuffer(4 + (lngRow - 1) * Len(IfRowTable)), Len(IfRowTable)
For i = 0 To 25
Name = Name & Chr(IfRowTable.bDescr(i))
If IfRowTable.bDescr(i) = Chr(0) Then GoTo ok
Next
ok:
If Not InStr(1, Name, "loop", vbTextCompare) > 0 Then
With IfRowTable
m_lngBytesReceived = m_lngBytesReceived + .dwInOctets
m_lngBytesSent = m_lngBytesSent + .dwOutOctets
End With 'IFROWTABLE
'Set IfRowTable = Nothing
InitInterfaces = True
End If
Name = vbNullString
Next
Erase arrBuffer
End If
End If
On Error GoTo 0
Exit Function
err:
Call GErrorHandler(err.Number, err.Description, "CIPHelper:InitInterfaces:" & err.Source, True)
End Function
Private Sub GetBandwidth()
Dim c As New CIpHelper, R As Double, s As Double
Dim r1 As Double, c1 As Double, SendBytes1 As Double, ReceivedBytes1 As Double
On Error GoTo errh:
c.InitInterfaces
If FirstTime Then
FirstTime = False
SendBytes = Format(c.BytesSent / 1024, ".0")
ReceivedBytes = Format(c.BytesReceived / 1024, ".0")
SendBytes1 = c.BytesSent
ReceivedBytes1 = c.BytesReceived
Else 'FIRSTTIME = FALSE/0
R = ((c.BytesReceived / 1024) - ReceivedBytes)
s = ((c.BytesSent / 1024) - SendBytes)
End If
lblBandwidthUsed = R+s
OldR = R
OldS = s
On Error GoTo 0
Exit Sub
errh:
Call GErrorHandler(err.Number, err.Description, "ScreenBlock:GetBandwidth:" & err.Source, True)
End Sub

Answer 1

1) 1024 bytes = 1 kB and 1024 kB = 1 MB. In other words, divide the number of kilobytes by 1024.
2) I assume if you don't want to monitor LAN traffic, you want to monitor Wireless traffic. That might be a little tricky to do as a generic solution, but if you know the MAC address of your lan network card, you can exclude it in the calculations which looks like the "bPhysAddr" variable to me.
You can get the MAC address of a PC executing the command in the command line:
ipconfig /all