VS 2010 - How To Read Byte Array Using Structure
Dec 9, 2011
I have a byte array and I want to read it using a structure. This is a common situation with structured files having information in various places in the file and it's much easier to read the data if it's mapped with a structure. BitConverter would be great if it worked with Structures, but it doesn't. Basically, I want to read the same memory address either as a byte array or as a structure, or have a function that works like
vb.net
MyStructure = BitConverter.ToStructure(bytearray(), position)
Maybe there's a pointer method to do this?
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Aug 29, 2009
I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.
I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.
Public Structure MESSAGETYPE_OIP_Login
Dim Header() As COMMANDHEADER
Dim UserName() As PSTRING
[Code]....
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Mar 27, 2011
I'm trying to get a string from a byte array previously read from memory
i can get the string like this
dim mem as string= ASCIIEncoding.ASCII.GetString(memory) or dim mem as string= UTF8Encoding.UTF8.GetString(memory) but when i try to concatenate this with another string i get a strange result dim result as string = "this is you memory string " & mem & " problem string" no matter what comes after mem in the concatenation it seems like it is not there when in fact it is because when i try this (mem has two chars in it) dim result as string = "this is you memory string " & mem(0) & mem(1) & " problem string" problem string appears so what i assume is that there are some vbCrLf chars in the string after reading (or is it from the conversion?)
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Apr 6, 2011
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.
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Aug 17, 2009
I wish to write a structure made up of fixed length strings to a file using y.Computer.FileSystem.WriteAllBytes or the like.I am using a VB6 project with fixed length strings that I have converted in to VB.Net.
Structure Record
<VBFixedString(22),System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray,SizeConst:=22)> Public tim() As Char
[code].....
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Aug 28, 2009
I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.[code]
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Sep 20, 2009
How do I read a raw byte array from any file, and write that byte array back into a new file?
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Apr 26, 2010
I have a client(VB.Net) that receives a packet from the server(Java), and for a while I struggled with some really weird packets that didn't make any sense, eventually took a look at the Java servers source and saw packet structures like this...
[code]...
and so I came across the term of bit-masking. After a few failed attempts and unsatisfying google searches later, here we are.In short, I need to read a byte array bit by bit.
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Feb 9, 2011
I am trying to achieve a drag and drop of outlook emails to my vb app. I found this thread which is very helpful
[url]...
the op shows how to get the FileName returned as well as a byte array which contains other data about the email message.
How can I read the byte array and get out the other information about the email message?
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Sep 20, 2011
I'm trying to read a byte array into a string however it's array is filling up from a dll in the following format. [Code] now its decoding the first byte but I think because of the next [0] it's not completing the whole array. This is the code that I'm using:
Radiotext = System.Text.Encoding.ASCII.GetString(szRetRDS)
I did think about writing it into another byte array excluding the [0] but unsure how I would go about this.
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Mar 15, 2010
Is there any special way of reading a pdf file into a byte array? The reason I ask...I want to fax a pdf file using faxDocument and FaxServer. My current code is working fine for everything else. Now I know that in the documention it says it should not work for pdf. But I can get some pdfs to send and some do not. When I fax a pdf through windows, it works. [code]....
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Mar 7, 2010
Some binary files have application variables at the end if you open it with a text editor you can see these variables. Now when I read these files into the processor memory the program does not work properly, however if I read a file without this it works fine. So how can I read a byte[] array to EOF so that when I pass that byte array into win32 api create-process it will create the process without corrupting the program?
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Jun 25, 2009
I try to read a stream and save it as byte array to add it later to zip file.this is the code that I use
Dim totalbytes As Byte() = Nothing
Dim iBytesRead As Integer
Dim sChunks As FileStream = File.OpenRead("c:myfile.wav")
Dim Totalread As Int64 = 0
[code]....
but there is something is not correct,
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Apr 13, 2011
Is it possible to read perhaps the first 150/300 bytes of a byte array without having to copy the array to another array of proper size.[cod]e...
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Jul 6, 2010
How can i write and read a array of a structure to a file? I have the following structure
[Code]...
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Aug 3, 2011
I have an array of structure like this:
Structure Planner
Dim Type As String
Dim Circuit As String
Dim Socket As String
Dim StepCMDText As String
End Structure
how do i write it into a file? (also read it later
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Jul 21, 2010
How would I copy/convert a string containing an ascii representation of hex values in to a byte array containing the actual hex values? For example, I have a variable containing the hex values delimited by spaces (I can change the delimiter):
[Code]...
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Jun 22, 2012
I'm trying to read the binary data from a binary file with the code below but the it's return the value in the byte array. How can i read the binary data from the binary file and then convert the data into string?This is how i create the binary file.
Dim fs As New FileStream(Application.StartupPath & "Agency.dat", FileMode.OpenOrCreate)
Dim bf As New BinaryFormatter()
Call bf.Serialize(fs, GAgency)[code]....
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Nov 27, 2008
Define a structure named product, The structure should contain 2 variables one as a string and the other as a decimal. The decimal is used to store the price and the string is used to store the item number.
Declare a module level array that contains 5 product structure variables
Code the main forms load event procedure so that it reads the item number and prices from the itemInfo.txt file The procedure should store the item numbers and prices in the module level array. It also should add the item numbers to the list box.
When the user selects an item in the list box the items price should appear in the xPriceLabel. code the appropriate procedure.
The code I have is as follows
' Project name: Glovers Project
' Project purpose: The project displays the price of an item.
' Created/revised: <your name> on <current date>
[Code].....
Seems the problem I am having is this line is returning a value less than 0.
itemprice = (itemnumber.Substring(productIndex, newLineIndex - productIndex))
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Nov 24, 2011
I have read a byte array called compressed_byte_array() from a file. This array is compressed using the zlib compression Deflate (RFC1951).
How would I decompress this array and store it in another array, let's say decompressed_byte_array(). I probably have to use DeflateStream and I have tried a few methods, but always ending up with a error message.
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Jan 29, 2012
I have this code which works well:
Public Function AESEncrypt(ByVal PlainText As String, ByVal Password As String, ByVal salt As String)
Dim HashAlgorithm As String = "SHA1" 'Can be SHA1 or MD5
Dim PasswordIterations As String = 2
Dim InitialVector As String = "CanEncryption123" 'This should be a string of 16 ASCII characters.
Dim KeySize As Integer = 256 'Can be 128, 192, or 256.
[Code] .....
What I am after is this: Rather than having a string to encrypt/decrypt, I have a byte array.
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Mar 30, 2011
I think I need a two dimensional byte array I currently have something like this:
Dim MbyteData(196608) As Byte
' Open the file that is to be loaded into a byte array
Dim oFile As System.IO.FileInfo
oFile = New System.IO.FileInfo(sFilePath)
[code]....
I now need to load several files at once (say four) so I need four arrays of 196608 bytes and I want to reference them by a number - 0 to 3, assuming the array is zero based. If I use Dim MbyteData(196608, 3) as byte or Dim MbyteData(3, 196608) as byte the syntax seems to be correct but I hit an error ("Number of indices is less than the number of dimensions of the indexed array") when I try to add the extra dimension to the stream read with something like oFileStream.Read(MbyteData(index), 0, MiByteCount).
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Dec 25, 2011
and i need to convert the image into a text.now anyone thinking that i can just use ocr is unfortunatly wrong i have tried about 5 of them and they dont work because the text in the image is to small for it to recognise it.so i need to search the above image for a smaller image such as this.so by doing this if i get a result saying true then i will be able to go from be there and convert to text.now i know of two way to search an image for a smaller image. first is by going by pixel search and well i can get that to work but it is to slow.the second method is to convert the image to a byte array(beig an image it will be a 2d byte array) and convert the other image to a byte array and then compare.
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Jan 14, 2012
I have a text box that I will paste into a byte array, for example:
02 01 05 BF DD 03
All I need to do is when I click on a button, for the program to take the length of the array and store it in RCVDMSG_Length() and then take the contents of the text box and put it into a byte array RCVDMSG(). From there I think I can figure out how to manipulate the array... but it's this first step that I'm stuck on....
So far I have this in my Form:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim RCVDMSG() As Byte
Dim RCVDMSG_Length() As Integer
RCVDMSG_Length = Len(TextBox1.Text)
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Feb 24, 2011
I am creating a class that will represent a file and I am going to have lots of properties. Now I want the properties to return either a integer or a byte array. Is this possible or do I need to create 2 different properties one for the integer and one for the byte array? When I try I get. 'Public Property something As Integer' and 'Public Property something As Byte()' cannot overload each other because they differ only by return types.
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Jun 6, 2012
Im trying to query a game server, and have been looking up what to send and so on...This is what they say:Quote:Request formatServer info can be requested by sending the following byte values in a UDP packet to the server.
FF FF FF FF 54 53 6F 75 72 63 65 20 45 6E 67 69 TSource Engi
6E 65 20 51 75 65 72 79 00 ne Query
[code].....
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Jun 16, 2012
I'm using WinPcap to capture incoming data. Basically I'm dealing with a continuous stream of incoming data, either as byte array or as memorystream (pieces up to 64kb).
I need to check this data to see if there's a certain url and then extract it.
The url I need to find looks like this:http://201.122.38.5/data/today/798572987-589571?139805890582 The length of the 'code' after "/today/" is always the same. The IP address changes. What's the best/fastest/most efficient way to continuously check these byte arrays or memorystreams and extract the urls without hogging the CPU too much?
[Code]...
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Feb 4, 2011
below is a byte array to string encoder. It uses the yEnc algorithm that is used for Usenet binaries (Usenet only supports text).
Doing a performance analysis in VS2010 shows that this is the most CPU intensive part of the application.
The encoder function is used thousands of times, so I'd like to optimize it as much as possible.
I'm using 'ReDim Preserve' instead of 'Take()ToArray', because I'm targeting .NET Framework 2.0. Is there a more efficient way of getting only a part of a byte array?
vb.net
'Values for yEnc Encoder
Public Structure EncoderValues
Public lChar As Byte
[Code].....
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Mar 24, 2010
I am trying to Convert a data field stored as IMAGE ( SQL Server 2000) using Java to a byte array using VB.NET Java uses signed numbers for a Byte array where as VB dosent. Can somone point me to how I can covert java byte array to VB byte array?
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Jul 16, 2010
i need to save an array of intptrs as a part of a structure in a file, vb.net gives me "File I/O of a structure with field 'pList' of type 'IntPtr' is not valid." error, ok i figured and tried to convert them to integers and while it worked for other singular intptrs it did not for the array as it just throws me a conversion error. I then tried rebuilding the array in the new sub of the save structure and while that sorta worked(i think) it then gives a "bad size" error when saving. Im out of ideas, saving the array elements one by one would be suicide as the amount varies and is well in hundreds,
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