Read incoming data form a port

[demon.KILER]

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

i thought the code was


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

error

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

any help would be helpfull

[the182guy]

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?

[demon.KILER]

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?

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

thx for future help

[the182guy]

Have a look at this, its a contest winner

http://www.pscode.com/vb/scripts/ShowCode.asp?txtCodeId=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/BrowseCategoryOrSearchResults.asp?optSort=Alphabetical&txtCriteria=packet+sniffer&blnWorldDropDownUsed=TRUE&txtMaxNumberOfEntriesPerPage=10&blnResetAllVariables=TRUE&lngWId=10&B1=Quick+Search

[demon.KILER]

yeah I will take a look at it thx

[high6]

Have a look at this, its a contest winner

http://www.pscode.com/vb/scripts/ShowCode.asp?txtCodeId=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/BrowseCategoryOrSearchResults.asp?optSort=Alphabetical&txtCriteria=packet+sniffer&blnWorldDropDownUsed=TRUE&txtMaxNumberOfEntriesPerPage=10&blnResetAllVariables=TRUE&lngWId=10&B1=Quick+Search


i've tryed those before but they dont work.

[the182guy]

@high6 are you using vb6 or .net?

[demon.KILER]

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

[demon.KILER]

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