VS 2010 Recovering Bytes From A File?
Aug 1, 2011
Well basicly i have a file from which i extract bytes and save them to a text file using this code :
Private Sub browse_Click(sender As System.Object, e As System.EventArgs) Handles browse.Click
Dim oFile As System.IO.FileInfo
[Code]....
Everything works well, but I don't know how to recover this file using the extracted data from bytes ! I Know for example the first byte of that file is 39 But i just can't do :
dim mybytes() as byte
mybytes(1)=39
You see what im talking about? I Want to recover those bytes from the same file I saved
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May 31, 2012
I used to posted a question on the problem I've discribed for the resource file randomly disordering by VS 2010 (also seen in VS 2008). And there was no obvious key to solve the problem.Designer codes are messed up by VS..But today I have a good news for you all: there might be ways to recover the problem.So I hope the moderators and devs of VS would notice this topic.
1. Build a form, and lay several kinds of controls, (maybe must) containing several ContextMenuStrip, ToolTip, ErrProvider, etc.
2. Set Localizable = True, and set some text(maybe must) including tooltip on/errinfo on properties for the controls at another language eg. Chinese PRC.
3. Double click and open the resource frmxxx.resource.zh-CN from the right or left (of your layout)panel by showing all files. Where frmxxx is the form we are just designing with languages.
4. From the opened resource file grid, remove some items. This is a not-common action (and I suppose this would be the reason why ppl were replying that they had never met the problem I've posted above), right, but it does very useful when the devs who want to remove some localized strings that no longer needed. Disgard the prompt and click OK.
5. Save the project or not. That does not matter.
6.0 DO NOT CLOSE VS NOR close your project. Just continue to go back to the form designer, and make more changes to the controls'text/tooltip/errinfo properties.
6.1 OR, IF YOU NOW CLOSE YOUR PROJECT and/or reopen later, the problem WILL NOT HAPPEN.
7. Save the project. Now check carefully, and you may found some properties are already messed up cross-controls!What is worse, this is just a beginning of the story. Developing the project in the first couple of days is alright if you don't care about the disordering of properties. But a nightmare would come to you someday, sooner or later, when you could never solve the problem but only to restore or giveup.
I don't mean that this would happen on every project everytime, and not sure if it's the only way to go, but it really taking occur by following these steps now. Fortunately I have just created a backup of my project so I can have it restored without any lose of work.
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Mar 4, 2012
The code search for the specified bytes in jpg file and when first match is founded msgbox gives you position of the bytes in the file and Function stops. [Code] Now, because I am newbie to VB I have one question. How can I change the Function so that Function search the whole file for all byte matches?
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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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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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Jan 9, 2009
My computer was running really slow so I decided to reformat my computer and reinstall Vista. I thought I had backed up everything I needed, but I COMPLETELY forgot to grab the Projects folder in my user folder, so this huge project I was working on is gone Does anyone know of any data recovery software that I could get for free (or even buy if it will definitely work) to get these files back? I can't afford professional data recovery.
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Mar 12, 2012
I have a WinForms app that is relying on several libraries over which I have limited control, such as Forms.Images and Forms.WebBrowser. Sporadic sudden memory leaks cause my application to crash. These are not over-time memory leaks that build up. They are random, often different COM exceptions and are impossible to predict -- sometimes they happen after one hour, sometimes after a day.
My current methodology to at least temporarily cope with the problem is to have another application verify that the first one is running by using GetProcessesByName(). However, this is problematic because the ongoing process sometimes crashes but does not close. I just get a WER message (despite the fact that WER is turned off on the computer). What's worse is that when the first process crashes and the memory leak builds up, the second process-checking application ALSO crashes. And then nothing works until I manually reboot the whole shabang.
1) Does anybody know an effective way to have Process A check if Process B is running without having Process A subjected to the memory problems that made Process B crash?
2) If the above is not possible, or too difficult, does anybody know any good third-party tools that can be used to ensure that processes are running without any outstanding WER errors, that restart processes if WER faults are detected, and that can withstand maxed out RAM?
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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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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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Jun 4, 2012
[Code]...
I have found the above code on generating passwords but when I converted the whole project it displays 2 warnings that the code was obsolete but when I search google I didnt found any fix for that warning.
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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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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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Jun 17, 2010
I'm receiving a byte array from a network device by using the TcpClient class and as I have no idea how much data will be being sent I have to just declare a buffer that is X number of bytes long and keep reading into that until I've got all of the data. I then convert this byte array to a string using Text.Encoding.ASCII.GetString but the problem is that this gets any null bytes that were at the end of the buffer after the string and it includes them in the string. This then means when I do String.EndsWith it doesnt work as I would expect it to because there are just loads of 0 bytes at the end of the string.
Once I had realised that was what was happening (which took a long time as these null bytes are completely invisible when you are looking at the data in String form) I thought fine I'll just use Trim on the string but I've found that this doesnt make any difference at all. I thought Trim was supposed to remove any blank space from the start/end of a string, which I assumed would include empty bytes as well.
So is there any alternative I can use that will trim the empty bytes off the end or do I have to do it the 'manual' way and loop through my byte array before converting it to string and remove any null bytes? One thing that has just popped into my head as I'm typing this is to try using the Chr method and pass it 0 and combine that with Trim like so:
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Sep 20, 2011
My issue is regarding overloaded functions of the already provided IIf function that would handle specific types. As you all know the IIf function provided returns objects, rather a specific type so for my needs I created a few overloaded function to do just that but with a specific type in mind. So having said I have IIf functions for types of booleans, strings, bytes, integers, etc etc.
Now my problem is when I'm trying to pass a byte value to this function that would return one of the two byte values. When I do this the designer keeps confusing my values as an integer value and calls for me to convert it to a byte. If I did this then it would defeat my entire purpose for creating these functions-which is to avoid any conversions. The only way I can solve this is by converting the whole statement itself or the true/false parameter parts individual to specify to the designer that these values are bytes. I'm just hoping there's a way of identifying the difference between bytes and integers..
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Dec 17, 2011
I'm trying to read bytes with 1200 interval for 100 times, but I can't get it working. This is my
Try
Dim fr As FileStream = File.OpenRead(OpenFileDialog1.FileName)
Dim data(fr.Length) As Byte
[Code]....
I need to read from offset 4896, then from 6096, then from 7296 for 100 times and for each interval add to the listbox.
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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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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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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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Oct 2, 2009
I am not so good with buffers and arrays and I dont know how to continue from here:
[Code]...
My intention is to open an image file as bytes, Convert the bytes to a string, send bytes to server and server stores bytes in a database. Then I need to reverse the process and be able to convert the bytes to an image.
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