Variables - Reading Bytes In A File?
Jan 2, 2010
After getting the file name I create a new filestream and load all the bytes from the FileStream into a byte array, now I need to get certain bytes and store them in fields like the second 4 bytes are the time the file was created. When storing these in the variables should I store them as bytes or as string/integers/etc.
Or have I done it completely wrong?
EDIT:Should I be doing this way instead of a filestream?
Dim data() as Byte = File.ReadAllBytes(path1)
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Mar 17, 2010
I've got a web app where I'm trying to validate that an uploaded file is .PDF. I can't use ContentType because if the user renames the file to have a ".PDF" extension, the browser reports the MIME type to be ".PDF" even if it isn't.
I understand that one way to "validate" that a file is a PDF file is to look at the first four bytes, which should always be "%PDF". How do I open and read the first four bytes of a file in VB.NET to see whether or not they are equal to "%PDF"?
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Dec 14, 2011
So i have one file, that has one header that tells me if the bytes are in little or big endian format.The content of the file after the file is something like this, one byte that indicates a new "section", then several bytes until the other "section". This bytes each one represent the number of the bytes that i need to read in the second section.
[Code]...
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Mar 8, 2011
Question 1: What is the difference between "Background Worker" and "Worker Pool" as indicated within the MSDN samples provided.
Question 2: I noticed while using, AddressOf _Function_, variables cannot be passed; what would be an efficient solution to this?
Question 3: While using multithreading is it required to invoke before setting variables, or only form properties?
Question 4: While using System.Net.Sockets is it safe/efficient to use Application.DoEvents while waiting for new data; or would be using a Do While loop be fine without DoEvents since the action would be multithreaded? Note: there can be up to 2000-3000 sockets in use at a time.
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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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Sep 7, 2009
I'm trying to read 5 bytes from a file and then do something according to what has been read. This is my code (I'll explain in a bit what's wrong):[code...]
It reads the 5 bytes I added to the encrypted file, but I want the CryptoStream to start from the sixth value and then copy the original bytes into the decrypted file, but it gives me an error:
Padding is invalid and cannot be removed.That's why I'm trying to make it read from the sixth value and then continue copying normally, but I'm stuck.
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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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Jul 6, 2010
I am fairly new to vb and have created an alarm program. I have figured out how to write an xml file saving my variables. I can only save one set of variables currently. I would like to save multiple alarms to the xml and read back the xml as a list of alarms that the program is processing. Can someone lead me in the direction to calling the xml a list of alarms and how to read them into variables
maybe if i save the alarms sorted by date and time I could process them as they expire.
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Apr 24, 2009
I have a program that saves encrypted data to a file and each variable is separated by a ";". I then read the file though this command:
[Code]...
It places all the encrypted data to a Rich Text Box. I need to decrypt the data and place into variables. How do I read each encrypted piece up to the ";" then decrypt, and place into a variable? I've seen streamreader examples but I don't want to use streamreader unless there is a way I can still get the OpenFileDialog view to be able to select the file location.
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Nov 29, 2009
I am reading data from a socket (as bytes) and storing this data in a string. Then later i need to access specific bytes within the string and do some math with them. However the bytes that I read back from the string are not what I am expecting.
[Code]...
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Jan 5, 2011
I've been using VBA quite a bit in the past to build userforms in Access, that used user-supplied data to custom-build sql statements on the fly, query data from a linked table, read that data into variables, perform calculations and spit out results onto the userform. Now I'm wanting to do some similar things in vb.net 2008.
I would use some code like this:
Set MyRecordset = New adodb.Recordset
MyRecordset.Open "SELECT * FROM Table1", CurrentProject.Connection, adOpenDynamic, adLockOptimistic
MyRecordset.Filter = "ID = '" & Me.cmbAgentName.Value & "'"
With MyRecordset
[Code] .....
Whenever I try this, I get an error message along the lines of "Conversion from type 'Field' to type 'String' is not valid."
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Dec 20, 2011
I am learning visual basic .net and I am attempting to translate some java source code to a vb.net project. The project reads mp3 details and then splits the file accurately according to the frameheader details etc.
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Apr 20, 2010
I as part of the support VB code for a larger ASP project, I need to read back the existing data from an Access database, to see if user has changed a value.
I'm reading the existing data back into a DataView using the following function:
Public Shared Function GetPolicyStatus(ByVal intPolicyID As Integer) As DataView
Dim strConString As String
Dim conMyData As OleDbConnection
[Code]....
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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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Apr 14, 2010
I need to be able to read bytes in Little Endian and in Big Endian as well. Is this possible to do in VB? I know that VB reads in Little Endian by default, but I also need to read in Big Endian.
I have tried this:
Dim i1 as Long
Dim fs As New IO.FileStream(filename, IO.FileMode.Open)
Dim br As New IO.BinaryReader(fs, System.Text.Encoding.BigEndianUnicode)
[code]....
This return the value "1616183296" when it is supposed to return "21856". I've opened the file up in Hex Workshop, and looking at it in Little Endian, I do get the value of "1616183296" and in Big Endian, I get the value of "21856".
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May 12, 2012
I've been trying for a long time to create a sorted table of values in a particularly specific way, and I seem to be running into a wall in .NET's file operations. The premise is this - I'm creating a table of values which are being stored as [1 Byte][2 Bytes][3 Bytes]. The location within the file is a value that relates to these three stored values, and so I'm attempting to seek to a specific position in the file, write the 6 bytes into that position, and repeat. There are literally billions of these values, and the total file size is over 100 GB.
Now, I've tried multiple methods to do this, but every single time, it decides it needs to rewrite the ENTIRE FILE every time any change is made. This results in every one of these billions of iterations taking a good 15 minutes, making the task literally impossible. I'm using .NET 4, and I've attempted to use Text, Binary, and Random Access to get it not to rewrite the entire file every edit, but it simply will not obey.
So my question boils down to this: How do I edit specific bytes in a file without writing more than just those bytes? The entire file has been pre-created to the precise size required, and no bytes will be added or deleted in the process. I simply need to overwrite the bytes that already exist.
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Aug 28, 2010
how to read bytes from a file... but is it possible to read each individual bit, one at a time?
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Oct 20, 2009
Is it possible to change few bytes in a file to make unreadable or is it necessary to change each single byte?
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Mar 26, 2010
I'm trying to edit the bytes in a file. Using this code:
Dim stream As Stream = File.Open("file.exe", FileMode.Open)
stream.Write(File.ReadAllBytes("srcfl.exe"), "0446335", "srcfl.exe".Length)
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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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Jan 31, 2010
I'm trying to open an existent file save a bytes in the start of it to later read them.
How can I do that? Because the "&" operand isn't working fo this type of data.
I'm using Encoding.UTF8.GetBytes("text") to convert info to bytes and then add them.
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Dec 22, 2010
I've been using the following code to download a text file from the web. It only downloads the first 100,000 bytes of the file which is no good if the file is big. The size of the file I'm downloading can vary from day to day, so I need to be able to download a text file of any size.
Dim wr As HttpWebRequest = CType(WebRequest.Create("http://sooty.postalgroup.co.uk/tempmac/nat-import.txt"), HttpWebRequest)
Dim ws As HttpWebResponse = CType(wr.GetResponse(), HttpWebResponse)
[Code].....
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Jun 21, 2012
[Code]...
How can i return the value? using bytes?
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Mar 5, 2011
I have an old fashion Database with several random access files and I need to import the data to a new Sql Server dababase the data. There are tables with 6 Bytes floating numbers fields and we have no Number data type with that length in VB. I tried and tried and... and can't find. I found this code in the ERP folder, is AlphaBasic. It use an envoirement namend A-shell from Microsabio .
[Code]...
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Mar 13, 2011
I want to replace some bytes from a binary file .[code]...
If the value of the textbox is too short I want to replace the remaining bytes for a new value "0"
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Feb 25, 2009
I am using the following code to write and empty (dummy) file to take up the remaining space on a device.RemSpace is a Public Variable declared as Long I have a function that gets the remaining space on the device and stores in the RemSpace variable (in bytes). I have tested with a msgbox to display the result of RemSpace, and it comes back correct (not 0). However, when the following code attempts to create the dummy file, the file is properly created but is only 0 bytes. What am I missing here?
[Code]...
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Nov 13, 2009
I want to open a file and to replace from 2MB to 3MB of it with another 1MB file. Is it possible?
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