Read incoming data form a port

hi every one can any one pls help me with reading incoimg data of the port

i thought the code was

VB Code:

sock.IOControl(IOControlCode.DataToRead, byt, bytes)
sock.BeginReceive(Bufferdata, 0,bufferdata.Length, SocketFlags.None, New AsyncCallback(AddressOf OnReceive), Nothing)

error

VB Code:

Message = "The system detected an invalid pointer address in attempting to use a pointer argument in a call"

any help would be helpfull

Hi there,

Im not 100% clear about your goal here, which of the following applies?

1. You want to open a port and let something connect, read the data and possibly send something back.

or

2. You want to read data coming into a port that is already in use, and was not opened by your program. IE you want to make a packet sniffer?

Quote:

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2. You want to read data coming into a port that is already in use, and was not opened by your program. IE you want to make a packet sniffer?

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is the exact thing I am trying to do for more than 2 days

thx for future help

Have a look at this, its a contest winner

http://www.pscode.com/vb/scripts/Sho...4090&lngWId=10

Its not only a packet sniffer, but the guy has created a library, so people can just use the library to sniff the packets, I havent tested it but you should be able to have it read the data from a specific port on whatever protocol you choose such as TCP or UDP

There is another one here:

http://www.pscode.com/vb/scripts/Bro...1=Quick+Search

yeah I will take a look at it thx

Quote:

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Originally Posted by the182guy

Have a look at this, its a contest winner

http://www.pscode.com/vb/scripts/Sho...4090&lngWId=10

Its not only a packet sniffer, but the guy has created a library, so people can just use the library to sniff the packets, I havent tested it but you should be able to have it read the data from a specific port on whatever protocol you choose such as TCP or UDP

There is another one here:

http://www.pscode.com/vb/scripts/Bro...1=Quick+Search

---

i've tryed those before but they dont work.

@high6 are you using vb6 or .net?

I use .net And i doesn't work for me

Any one tryed winpcap before ??
if U did pls explain to me how to use them in vb.net