Edit The Port Bytes In The TCP Packet?
Feb 21, 2009
i have a program that sniffs for packets on a port going to a specific address on my lan and then sends an exact copy to the same address on another port, the problem is when i edit the port bytes in the TCP packet i have to regenerate the checksum, and thats where the problem comes in, everything i have researched on this just doesnt make sense to mei am looking for a function that will output the checksum and a little explanation on what i need to put in for it to come out right
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Apr 21, 2010
I have a problem that i cant solve i am trying to buffer 28 bytes from the com port into the array actual_packet_VPS1(30). It works with the counter set to 0 - 15 but doesnt work when we increase the counter size to 0 -28.
Private Sub MSComm5_OnComm(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MSComm5.OnComm
Dim buffer As Object
[Code].....
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Aug 30, 2010
I'm working with a device using the serial port and i am sending a command from the pc to the device like this:
1. I Change the parity to mark
2. then send a byte
3. then Change the parity to space (here is the problem)
4. Send a lot of bytes
but the device just ignores all the last bytes, im pretty sure its a timing problems, so a timeout occurred attempting to send a command, how can i change the parity without losing time?
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Mar 10, 2010
I'm using 2008 Express and I'm trying to send 1 byte of data on the serial port.
Serialport1.write(123) Sends 3 bytes with the ascii codes representing 1 2 and 3.
I want to send 1 byte that contains 123.
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Mar 12, 2009
In my serial port application, I have my code -
Private Sub SerialPort_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort.DataReceived
Dim cnt2 As Byte
[code]....
For some packets I sent, "Error Data Received" came up. I checked BytesReceived, it was 0. My question is: since SerialPort_DataReceived processes data received, data was supposed to be received. Why the number of bytes I read was zero? BTW, when is this event accessed? it is accessed when any number of bytes received or the whole packet received?
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Jun 4, 2009
I have a timer control that sends data to a hardware every 3 seconds. I sent 6 bytes of data. In return I am expecting 8 bytes of data in DataReceived event. First time I send 6 bytes of date, in DataReceived event, I get the expected 8 bytes. Then in next 3 seconds, again the expected 8 bytes of data is received. But after that I find that DataReceived is fired 2 times: first time I get 6 bytes and then I get 2 bytes. After that I again get 8 bytes as expected. So in short, 2 times I get 8 bytes as expected and 6 bytes and 2 bytes and again 8 bytes. This pattern is repeating continuously. Why? Is there any reason why I cannot get all 8 bytes everytime? Note that the code is in vb.net 2008
Code in button btn_Start ()
'Set serial port parameters
x.PortName = "COM1"
[Code].....
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Jul 8, 2009
I'm working on a project involving reading RFID tags, I've written the code and it reads the tags ok by using the recieved data handler and displaying the result in a listbox, the only problem is that the data displayed has a couple of unreadable characters at the start (I'm using ReadLine() command.)If I read the buffer byte by byte the data is all readable.How can I read and display the whole 16 Bytes in one go??
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Jan 22, 2010
I have textbox with vbscript, user could type integers, then hit return key, KeyUp event for return would trigge theWriteFile()being called for com port to write string to the device, if Ihit return key slow, I would get 0bytewritten for WriteFile(), timeout happening basically,if I hit return keyquick,
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Nov 13, 2010
I want it to do is that you input a string, then you select an algorithm (Theres only going to be one RijnDael) then you input a key, then the Initialization Vector comes from "txtIV.text" then you select the key bytes and the block bytes from the numeric up/down, then you either encrypt or decrypt.
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Sep 16, 2011
Ok i am having some issues designing a base-class to handle generics.Caveat is i need to restrict the type put in as a Numeric type, specifically Int16, Int32, or Int64 (Short or Long).I know you can do Of T as {Structure} but i dont want to select the key bytes and the block bytes from the numeric up/down.
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Feb 19, 2011
I keep getting a ProtocolViolationException "Bytes to be written to the stream exceed the Content-Length bytes size specified." on the following code.I've tried setting Content-Length numerous ways with no success.
Dim url = "https://domain.com"
Dim req As WebRequest = WebRequest.Create(url)
req.Method = "POST"
req.ContentType = "application/xml"
[Code]...
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Dec 28, 2010
What exactly does this line do?
i = stream.Read(bytes, 0, bytes.Length)
Does it read the entire message string sent by the client? I have a line to write to the stream later in the code and that does not seem to be sending anything back to the client, although the code around is excuting.
i = stream.Read(bytes, 0, bytes.Length)
While (i <> 0)
Try
' Translate data bytes to a ASCII string.
[code].....
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Sep 22, 2011
I created a text file contains 4 bytes of data
AABBCCDD
I just want to read the first 2 bytes (AABB) to execute it with my program.
Then I'll need to read the last 2 bytes (CCDD) for another computer routines
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Aug 2, 2009
Probably missing something silly here, Her eis what my display looks like Sending image...(401303) I would prefer it displays as Sending image...(391 kb)
[Code]...
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Apr 28, 2010
I have a form that adds new contacts. New contacts are added by pressing an appropriate button and they appear as an entry in the list on the form. I try now to add an edit button that will edit existing entries.User will select a given entry on the list and press edit button and will be presented with an appropriate form (AddContFrm).Right now it simply adds another entry with the same title. Logic is handled in a class called Contact.vb Here is my code.
Public Class Contact
Public Contact As String
Public Title As String[code]....
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Nov 27, 2010
I'm mohammed from Oman ,I'm visual studio.net programmer How I can Read the Data From Barcode Weight scales By Serial port and TcpIp port
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Jul 25, 2011
I have a Windows form.in windows form have a combo box that give me a list of available port serial with it code (Dim ports As String() =SerialPort.GetPortNames())for example( Com1,Com8,Com15,...).but I want to give me fullname of serial port in device manager for example in dvice manager is these (Comunication Port(COM1) - Printer Port(LPT1) And USB Serial Port(COM8)).how to Get it?
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Jun 9, 2010
I would like to detect the Address and Port number of the Parallel Port in computer.
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Mar 10, 2009
I'm building a simple udp lan chat application in vb.net and I'm wondering how I should split my packets. Each sent packet should have like an id, a username and ip address from where it's coming and maybe also a command part for like join or leave to update my userlist and a text message. I'd like to know what is the easiest way to put all this in a simple packet then easily split and access different parts from it when it's received. thanks.I'm using UDP since this is only in lan so i'm broadcasting to *.*.*.255
What I want to know is what would be the most easy and powerful way to format my packets so they include a username , an id, a command and a text message, then the user receiving it decrypt it to show only the message written by which user or if it's a command like join or leave to show the appropriate message of joining and add the user to the list for exemple.
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Mar 11, 2010
first question is: Do you need to port-forward anything in order to receive a response?he sake of all that is good and holy, don't use ACCESS, EXCEL, or a TEXT FILE as a database. If you want your program to use a "local database", without any of the hassle of setting up a MS SQL or MySQL server, just click this link: >>> SQLite <<< Seriously. This is for your own good.
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Aug 2, 2011
If I uninstall the COM1 and reboot, it works. If I shut down (power off) and restart, I get the message below. If I uninstall then click on Scan for Hardware Changes,The given port name does not start with COM/com or does not resolve to a valid serial port. Parameter name:portName
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Feb 22, 2009
I am trying to intercept connections on port 2302 that is being used by a game. I was think about using something along the lines of
#Region " Imports "
Imports System
Imports System.IO
Imports System.Windows.Forms
[code]....
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May 2, 2011
I want to create my own pocket editor like WPE because i want to program it.(To send special messages to the game servers when my program receives something.)
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Aug 7, 2011
I can already capture packets however is it possible to edit the packet and then send it off? Suppose I had a udp pakcet that said "11-mydata", I want to change it to "11-newdata" then send it off. I know which packets will be accepted and which ones will be modified and sent. So is this possible?
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Oct 9, 2010
I just update my software and begin to use the vs2010.I want to when my users use my program,if they haven't installed the net framework4.0 or they installed the old net framework version,my install program can auto-install the net framework.
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May 2, 2012
Working with my friend on a Minecraft casino program. I want the program to send a packet of data to the server. He can make the plugin to capture the data in java but how do I make my end of it to make it send the data to the server? Do I need to make a class with the data to send the data?
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Jun 17, 2011
Now, I have a executable build in vb .net with MySQL.Data.dll (library to allow connection to my remote database) that checks for data in a databaseNow then, when using a packet sniffer tool, I can see all my detailsHow can I prevent thisAlso, as a security measure, I have tried obfuscating the connection string in the exe, but that is only on the code part so I'm sure is not enough as I've seen my string in Wireshark
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Feb 2, 2011
I have a packet that I need to send to a client with an ID of 255. I've had no problems sending packets with IDs of 0, 1, and 2. The ID has to be 255. For some reason, after the translation has happened, both me with my server, and the client, get "63" for any Id greater than 127.
This is the code I am using:
Console.WriteLine(Asc(System.Text.ASCIIEncoding.ASCII.GetString(System.Text.ASCIIEncoding.ASCII.GetBytes(Chr("255")))))
Now, This is an overly complicated version of what the server does. You may consider this a bit unnecessary but the inverse functions performed are for your viewing reasons only.
Where it says "255" is the Packet Id I need sent in the format above. As I said, anything larger than 127 returns "63".
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Apr 9, 2012
I want ask how i can send hex packet to server
i am able to connect IP and port
in packet the data i send is.3..the hex code of data is 00 33 00 07 00 00 04 0F 95 13 00 00 00 here we can see that for 3 hex 33 is used and for char "." 00 07 13 and many others are used and for its 0F used [code]...
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Jun 8, 2009
I have simple udp client and server using UdpClient class in .net frame work 2.0. My Ip address is 192.168.5.20
and client ip address is 192.168.1.25 and we client pc and mine are on same network. When i tried to send udp packet from client to server exception occurs: "A socket operation was attempted to an unreachale host 192.168.5.20:10080..." But when i change my(server) IP address to "192.168.1.20" communication is fine.How i can solve this problem or,how i can send packets other than my domains ip addresses.
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