I am in need of encrypting a byte array, but my encryption method that I found strictly deals with strings.
Here are the two pieces of code that I am dealing with.:
The byte array (the bytes that need to be sent encrypted)
Code:
Dim outStream As Byte() = System.Text.Encoding.ASCII.GetBytes(TextBox2.Text + "$")
serverStream.Write(outStream, 0, outStream.Length)
serverStream.Flush()
[Code]....
Working with System.Cryptography, I'm noticing that data arrays up to a certain size will either conform to the size of the Initialization Vector (IV) or the size of the Key provided. So with a 48-byte Key and a 32-byte IV, up to around 42 bytes of data will encrypt to 32 bytes and 44+ will encrypt to 48 bytes of data. I've tested this with a variety of data arrays, and it seems to always come out the same... but I have a concern that higher byte values in the original array may result in longer encrypted arrays.
how or whether I can construct byte arrays that will be guaranteed to come out of Encryption at a pre-determined size?
Objective: Combine byte arrays, read specific sections, and then cut byte array at specified point.
Private Sub DataArrival(ByRef aBot As xyzSocket, ByRef theData As Byte())
Dim RDLength As Int32
If aBot.ReceivedData Is Nothing Then[code]....
I'm not sure if I have this right to begin with because I can't test it without having it completed.
I have 2 byte arrays. I want to merge these two byte array into 1 byte array.Usually, I just create a new byte array with length = byte array #1 + byte array #2. Then copy byte array #1 and #2 to the new byte array.do I have more efficient way to merge 2 byte array using VB.NET and .Net 4?
View 2 RepliesI'm trying to find a simple and easy encryption/decryption method for strings. The strings will contain spaces, special characters, numbers, and letters. I just need to be able to encrypt/decrypt them.
View 3 RepliesI'm trying to combine 2 byte arrays and then create a new byte array that contains the contents of both but running into a problem. The error says 'Source Array was not long enough.' I'm trying to combine HeaderByteArray and bytBuffer into newByteArray. I don't understand what Source Array is not long enough means and how to correct this.[code]...
View 9 RepliesI am trying to compare two long bytearrays in vb.net and have run into a snag. Comparing two 50 meg files takes almost two mins so I'm clearly doing something wrong. I'm on an x64 machine with tons of memory so there are no issues there. Here is the code that I'm using at the moment and would like to change.[code]...
View 5 RepliesI think there is Copy.to function but i cant find it
View 2 RepliesA project requires to allocate a varying number of byte arrays (buffers).
It would be ideal if the following definition would be possible:
Dim ArrayOfBuffers() as buffer(10000) as Byte
The byte arrays must be ordered sequentially because they have to be written to a file by efficient procedures destinationFile.Write(ArrayOfBuffer(3),1000,1000)
The number of buffers will change during program execution sometimes. Therefore it would be nice to be able to do a ReDim on the data structure when needed.
am trying to pass a structure that contains 2D arrays as Byte from VB.net to a C++ dll. The dll returns the structure with the 1D arrays filled. I am using UnmanagedType.ByValArray to pass the arrays from VB.net to C++.
Sample :
----------------------------------------- Structure -------------------------------------------------------
<Serializable(), StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi, Pack:=1)> _
[Code].....
I am having some major problems with byte arrays. First off the bigger array I have the more values go missing, I originally wanted to make a huge array and just dump like a 100mb chunk of memory in it but when I did that every byte in the array returned 0. So I experimented a bit and found 4kb to be the biggest chunk size to reliably not return 0.. ok I figured I'll just loop the 4kb and glue them back together later but no such luck, after being combined into the main array the bigger the number gets the more values that should be there just aren't.
Here's a code sample:
Dim retval(4095) As Byte
Dim combval(RLen) As Byte
For i = 0 To RLen - 4095 Step 4096
ReadProcessMemory(ProcAccess, i, retval, 4096, 0)
retval.CopyTo(combval, i)
Next i
WriteLine(combval(321603964))
WriteLine(ReadMemory(321603964, 1)(0))
So with the last 2 lines if I pull up some smaller number like 8 digits or so it reports back no problem but anything slightly bigger like the number i have written in there right now is just 0. After some additional research I discovered that the reason why 4kb is the max size I can reliably get is coz that's the size memory chunks are made of, "page" as they call it. Why the memory reading drops off at higher addresses alltho I suspect it has something to do with the way memory is structured and I am just not hitting the startpoint of a page anymore due to an offset or something somewhere.
I have an aspx page which houses an iframe. When a button is clicked, a WCF is called to produce a PDF which is read into a byte array. I was storing the byte array in a Globals.vb file like this:
Public Shared PDF_Data as Byte()
The global was loaded from the parent aspx page like this:
PDF_Data = MyWCF.Create_PDF_File(SomeVariable)
After that, the iFrame's src was set to a blank aspx page, which had the following code in the page_load event:
'Write the PDF binary data to the screen (viewer)
Response.Clear()
Response.Buffer = True
Response.ContentType = "application/pdf"
Response.BinaryWrite(Globals.PDF_Data.ToArray)
However, realizing that this application will have several users who will get different PDF documents, I have learned that this is not the way to go. My shared variable would be accessible to all users, a big no-no.However, I am stumped as to how I'm going to store the byte array and make it available to a child aspx page from it's parent.
The relevant code below is not achieving what I hoped it would. I intend for
1. SerialPortBufferTemp to be used as the container for each Serial Port Read.
2. _buffer should contain the resultant array from two separate Reads, the second appended directly after the first.
(E.g. 60 bytes read on the 2nd Read will be appended to the 168 bytes received on the first Read (228 total resultant byte length))
The problem with my code below is that _buffer has increase in size from 300 bytes to 600 bytes, skipped bytes 168 to 300 (leaving them all zeros) and added the remaining 60 bytes from the second read beginning at _buffer[300].
private List<byte> _buffer = new List<byte>();
byte[] SerialPortBufferTemp = new byte[300];
serialPort1.Read(SerialPortBufferTemp, 0, iBytesRead);
if (iValidRecordCtr == 0) {
_buffer.Clear();
[Code] .....
I have two strings arrays
Dim sir1() As String = "m1-m2","m1-m3"
Dim sir2() As String = "1-0","0-0"
What I want is this output:
m1-m2 1-0
m1-m3 0-0
Which is the fast method to concatenate them?
I tried
Dim sir3() As String
sir3=sir1&sir2 but with no result
I have two strings arrays
Dim sir1() As String = "m1-m2","m1-m3"
Dim sir2() As String = "1-0","0-0"
[code].....
I have been summoned with the task of taking a tab delimited file and converting that file so it can be read by a third-party program. I am trying to think of the best way to do this, but I am having a hard time. Here is a view of the raw data that must be altered:
fkstoreidHeaderMarkB1RegNodateofbusinessNoRegEntriesTipsOverRingsVoids$Voids#NetSalesDP1_2GuestsDP3GuestsDP4GuestsDetailMarkfkdaypartidRecTypeGLB2Sales
1061HNULL101/01/2008NULLNULLNULL113.263512785.4714453137D2041005NULL2220.25
1061HNULL101/01/2008NULLNULLNULL113.263512785.4714453137D3041005NULL9170.19
1061HNULL101/01/2008NULLNULLNULL113.263512785.4714453137D4041005NULL670.75
[Code]...
I am toiling with the best way of doing this. So far, I am not having much luck. I have used arrays quite successfully in Java, but I am not sure that this is the best way to go here. I would have to get how many lines there are and read each line. Make the changes, and then go on to the next line. I think scanning the document line by line using a loop is the best way. However, I am not sure.
I was wondering if, perhaps, someone could help me understand why the following code gives me a garbled result? Instead of displaying as it should I get '.Net 2.0 Application Development Foundation Framework Microsoft'.[code]
View 2 RepliesI can open a file in a hex editor and know that each 2 digits is a byte, they are 8 digits in binary correct?
How are they stored in arrays in VB.NET?
So if I have:
Dim xx() as byte =
What would I put after the equals? The hex digits from the hex editor? (This is just a program I'm not going to save, basically I don't want to open files to get etc. I want to put in the bytes in the code.)
I'm making a random sentence generator that takes subjects, predicates, etc. from user input, stores them, and then randomly chooses one value from each category and prints it in a textbox. Or at least, that's how it's supposed to work. But I just can't seem to get the text to print in the textbox. Everything compiles fine, but when I click generate, Windows gives an error.
Since I have barely any time, for it is a project at an enrichment course that ends in 2 days, I've been trying everything I could without taking too long.[code]...
The problem I'm having is I'm not sure how to go about getting the correct ones into the correct arrays. The data is scattered throughout the file. They are not on the same line and some are multiple on a line as well as blank lines, however they are in pairs. As they are not separated by commas or just white space is there a way to load the first string to the first array and every other string to the second array
View 3 RepliesAs a continuation of my other thread, "Finding A Pattern without a string Array (http:[url]....)", I would like to continue asking questions about enhancing a scanner with a few things:
1. Here is my code for finding signatures in a file:
'First the Signature Class:
Interface Signature
End Interface[code]......
I was getting weird results when doing multiple splits on a string, so I decided to make a simple test to figure out what was going ontestString "1234567891011121314151617181920"If I wanted to get whats between 10 to 20 in Javascript I would do this:var results = testString.split("10")[1].split("20")[0]Which would return 111213141516171819However when I do this in VB I get 111Split(testString,"10")(1).Split("20")(0)It seems the 2nd split is only recognizing the first character no matter what I put.
View 3 RepliesI'm attempting to create a small app that allows a teacher to input 5 students with 5 test scores each. I need to create arrays of strings to hold the five students names, an array of five strings to hold each student�s letter grade, and five arrays of five single precision numbers to hold each students set of test scores.
[Code]...
i've to declare two constant arrays one bidemensional of strings the other bidimensional of Doubles?
View 10 RepliesIm looking for a method to parse incoming byte arrays. The code i use now for recieving is:
[Code]...
Why does C# define Byte+Byte=Int32 instead of Byte+Byte=Byte like VB?
View 1 RepliesSay I have a List(Of Tag) with Tag being an object. One member of Tag, Tag.Description, is a string, and I want to make a comma-separated concatenation of the Description members.Is there an easier way to do this than to read the Description members into a List(Of String) and then use the Join function?
View 2 RepliesI have set up a method in vb.net and in xcode for encrypting a string using as far as i can tell the same parameters for an AES encryption.I've looked all over the place but cannot find information on whether they use the same encryption algorithm and settings.
this is the vb.net code:
Dim encryptAES As New AesCryptoServiceProvider()
Dim encoding As New UTF8Encoding()
Dim encryptor As ICryptoTransform
encryptAES.Key = encoding.GetBytes("12345678901234567890123456789032")
encryptAES.IV = encoding.GetBytes("1234567890123416")
encryptAES.Mode = CipherMode.CBC
[Code]...
I create my algorthm and its finished but there is a problem, it encrypte all text and all text in a file but after decryption when i open my file (a video file)the player show all information about file(duration,size and ect) currectly but it dont play that my program encrypt and decrypt byte by byte and place a asci code in bytes(0 to 255)
View 12 RepliesI just converted the following code from c# to vb.net. It is functional and works correctly with my company's firmware/devices. My next challenge. Previous serialport code used much more readable structs which where then converted (after building a packet) into byte() automatically as part of the serialport encoding. (this is my understanding)How could I
1. morph byte arrays 'ToSocket' and 'ToMTP' below into structs and
2. convert into byte array for Socket.BeginSend(byte(),.....) to stream out to remote devices?
Imports System.ComponentModel
Imports System.Text
Imports System.Net.Sockets
[Code]....