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Converting code to VB.NET

Posted on 2007-03-23
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Last Modified: 2013-12-17
Trying to convert the following code to VB.NET  In my attempt to do this on my own I must have missed something.  My code is below also.

Also reference my origional question that brought me to this code
http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/Q_22454308.html

Code to convert***************
[DllImport("iphlpapi.dll")]
public static extern int SendARP( int DestIP, int SrcIP, [Out] byte[]
pMacAddr, ref int PhyAddrLen );

IPAddress addr = IPAddress.Parse("192.168.0.1");
byte[] mac = new byte[6];
int len = mac.Length;
SendARP( (int)addr.Address, 0, mac, ref len );
string macAddress = BitConverter.ToString( mac, 0, len );

My conversion attempt*****************************

Public Class MACRetriever

    Declare Function SendARP Lib "iphlpapi.dll" Alias "SendARP" (ByVal DestIP As Int32, ByVal SrcIP As Int32, ByRef pMacAddr() As Byte, ByRef PhyAddrLen As Int32) As Int32

    Public Shared Function GetMac() As String
        Dim addr As Net.IPAddress = Net.IPAddress.Parse("10.3.1.245")
        Dim addrMe As Net.IPAddress = Net.IPAddress.Parse("10.3.1.247")
        Dim mac(6) As Byte
        Dim Mac2(6) As Byte

        Dim b As Byte
        For Each b In mac
            b = 1
        Next
        Dim len As Int32 = mac.Length
        Try
            SendARP(addr.Address, addrMe.Address, mac, len)

            Dim macAddress As String = BitConverter.ToString(Mac2, 0, len)
            Return macAddress
        Catch ex As Exception

        End Try
        Return "No Luck"
    End Function

End Class

0
Comment
Question by:Corey Scheich
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4 Comments
 
LVL 25

Expert Comment

by:dstanley9
ID: 18779545
Two things I see:
1)
        For Each b In mac
            b = 1
        Next

This doesn't really do anything to the source array (the byte is passed by value).  What you want is:

        For i = 0 to mac.Length
            mac(i) = 1
        Next

2)
You're never setting Mac2 to anything.  Was your intent to copy mac into Mac2?
0
 
LVL 13

Accepted Solution

by:
Corey Scheich earned 0 total points
ID: 18780416
I figured out what went wrong I was passing the byte array as byref and it needs to be byval.  The following works.

    Declare Function SendARP Lib "iphlpapi.dll" Alias "SendARP" (ByVal DestIP As Int32, ByVal SrcIP As Int32, ByVal pMacAddr() As Byte, ByRef PhyAddrLen As Int32) As Int32

    Public Shared Function GetMac(ByVal ForIP As String) As String
        Try
            Dim addr As Net.IPAddress = Net.IPAddress.Parse(ForIP)
            Dim addrMe As Net.IPAddress = Net.IPAddress.Parse("10.3.1.247")
            Dim mac(5) As Byte
            Dim IP() As Byte
            Dim IPInt As Int32

            IP = addr.GetAddressBytes()
            IPInt = BitConverter.ToInt32(IP, 0)

            Dim len As Int32 = mac.Length
            SendARP(BitConverter.ToInt32(addr.GetAddressBytes(), 0), 0, mac, len)

            Dim macAddress As String = BitConverter.ToString(mac, 0, mac.Length)
            Return macAddress

        Catch ex As Exception

        End Try
        Return ""
    End Function
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