I want my program the be able to calculate the CRC32 of a file and to change it. I already have the CRC32 calculation class now I wanna know how to make it change the value.
CRC32 calculation class:
Code:
Private crc32Table() As Integer
Private Const BUFFER_SIZE As Integer = 1024I
[Code]....
I need change this code to calculate crc16 form file, I found on net only this example. My actualy knowledge in programming is totaly green.
Public Shared Function GetCRC32(ByVal sFileName As String) As String
Try
Dim FS As FileStream = New FileStream(sFileName, FileMode.Open, FileAccess.Read, FileShare.Read, 8192)
[Code].....
i have a scanner set up which scans .bin and .iso files and returns the crc32 checksums (then displays various info based of that etc)
Im looking into adding support for .rar and .zip files, so the end user wont have to extract there files to scan them, how ever that adds to many variable for the crc32's based of what each persons compression is etc. So what about scanning the file inside of the rar/zip file.
So would it be possible to scan a rar or zip file, and get the crc32 of the .iso/.bin located within that archive?
I'm trying to find a CRC32 computation algorythm that output data in positive 8-character HEX (like winrar CRC for example).
All algorythms found return a positive/negative integer that I don't know how to handle...
I'm developing a data logging application using VB for the actual logging to a MySQL database. I'm reading a value from a device and then running an insert query every minute. This is great but if the value doesnt change all day then my records are going to all be the same. I'd like to try and calculate the percentage of change on the value and only run the insert query if the percentage of change is greater than, say 5%.
View 2 RepliesI am trying to generate CRC32 in my program. Unfortunately it works ~70% of the time. Would that mean that my function doesn't take care of some special case correctly? Can someone give it a quick look and let me know if I did an error while converting C code to vb.net ?
[Code]...
I'm encrypting a file with AES using CryptoStream. I'm also creating a CRC32 hash of the original file data. Later I need to decrypt the file and create a CRC32 hash of the decrypted data, in order to check if the decrypted file is 100% the same as the original file.
This is a part of the encryption routine. I'm reading a file in chunks and writing them encrypted to a new file. At the same time I'm creating a CRC32 hash of the chunks of data, which will give me the CRC32 hash of the entire file in the end. This works fine.
vb.net
'// Create the CryptoStream
Dim Crypto_Stream As New CryptoStream(FS, crypto_transform, CryptoStreamMode.Write)
[code]....
I am working on Visual Basic Express and I am supposed to calculate the change from a transaction.
View 1 RepliesIt is a cashier change return where the user enter the amount owed and the amount paid and when he/she press calculate the program should display the change due as well as the number of Dollars, Quarters, Dimes, Nickels, and pennies returned to the customer. When I run the program sometimes it gives me the right output and others it gives wrong output and it rounds the output. I just want to let you know that I have the option strict on. I will paste the code below
CODE:
I am retrieving lists of crc32 hashes that contain names of files, not there contents.I need to be able to decrypt the strings which are hashed names like "vacationplans_2010.txt" which are less then 25 characters long.
View 3 RepliesI am making a program for a game to change the textures. But when you edit an image file(the texture) it will change CRC32 and the game will notice you changed it so if you start the game the texture will just become grey. So what I want is that you can change the CRC32 code back to the old one that the game wil recognize and the texture won't turn grey. Now I found the CRC32 calculation on the internet but I can't figure out how to change it to the code you want.The CRC32 calculation class:
Option Explicit On
Option Strict On
<System.Diagnostics.DebuggerStepThrough()> _
[code]....
I am trying to learn how to use the modulus operator.this excersise is a change calculator and is supposed to calculate the number of dollars , qtrs, dimes, nickels and pennies from the change that is calculated.
in the form if i put a value in for owed = 30.00 and paid 34.25 my dollars returned = 4 and that is correct but the number of qtrs = 0 and should be 1. I am not sure how to correctly use this - any assistance you can provide is great - this is purely educational
Private Sub btnCalc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalc.Click
Dim owed As Decimal
Dim paid As Decimal
Dim change As Decimal
[Code]...
I'm having a little trouble working with structures and using a counter for the same structure. my structure gets its data from a text file which i readoff and assign ok. Here's part of my code
[Code]....
I have a calculate function that adds twenty text boxes together a+b, etc... 20 +20, B changes value when a selection in combobx is changed, how can i make the calculate funtion work up selection change in combobox ? You would think the selection change or index change , but that doesnt work because the tetbox doesnt actually get the new value till after the combo selection is made, so you actually have to go and make the selection twice I know i can put the code in the textbox value change , but i dont want to do that for 20 text boxes and i am assuming there must be a BETTER way?
View 1 RepliesI am trying to calculate the number of years for my calculate age event handler, however i am apparently missing a method or whatnot because im trying to calculate the age , can anyone suggest help on this. I need to subtract years to get my age but when i try the birthdate.Subtract (currentDate) method i get an error about not able to convert from LONG?
So below is what I have.
Private Sub btnCalculateAge_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateAge.Click
Dim currentDate As Date
Dim BirthDate As Date
Dim Age As Long
[CODE]
How to calculate the no. of rows in the file which we have uploaded that might be either a text file or csv or excel file.Im using the code to get the records count like this:
Dim FileCount = From lin1 As String In File.ReadAllLines(hidFilePath.Value.ToString())
Let dd = lin1.Count
Select dd[code]..........
but in some cases im getting wrong count. it is not showing the exact count.i should be able to get the count without looping each record in the file.
i have a big problem i have no idea what i am doing and need to create a program that can add customers and calculate and add the car qoutes to a text file. the information also needs to be retrieved, basically i want someone to finish the qoutes form for me complete with code its like connect the dots but with code :P can you fill in the "dots", create and edit btw for some reason it was called !! ERROR !! because it was a bad second version of the first version that got deleted so i used this one anyway XD[URL]..
View 5 RepliesI'm trying to calculate an average no from data imported from a text file using streamreader. I'm not sure how the loop should read, and the result (average) I want to hold in a separate variable for future use.[code]...
View 1 Repliesi am trying to code a program in vb.net that will calculate the predominant or average colour in an image file and then change the fillcolor of a rectangle to that predominant colour. I want to do that by getting the RGB value of each pixel, adding them up and then dividing them by the total number of pixels in the picture. This is the code that I wrote to do that.
[Code]...
I am a beginner programmer so this is basically the second time I fired up VS (not much experience). I searched the internet for the last hour but found nothing that might help me. I made sure every value is positive and changed all numerical variables from integer to decimal and I still get the error.I have absolutely no idea why this doesnt work but if I remove the "for" loop then the line written in bold works just fine.BTW this is my first post so scuze any mystakes I probably made.
So I am doing an assignment for class and I need to calculate wind chill and print the output into HTML file. This is what I have so far, so if someone could help me out, cause I am not getting the right answer.Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TextBox2.Text = 35.74 + (Val(TextBox1.Text) * 0.6215) - ((Val(TextBox1.Text * 35.75) ^ 0.16) + ((Val(TextBox1.Text) * Val(TextBox1.Text) * 0.4275) ^ 0.16))End Sub
Mod: Please remember to place your code inside the tags
How to calculate the time remaining in copying a file and displaying it through a progess bar?
View 1 RepliesSo, I've got a text boxes which loads up a content from a XML file, usually a numbers I want a button, so when I will change the numbers on the text box, the data in file will change as well, in other words a save button That's how the data is being taken from a file
[code]...
Those EditPaths, Playa2 etc are making up a path to a file
in the current project im making i've decided to add in some tools, 1 of which is a renamer based of a renamer app that already exists (called scdtoolz), i want to build my own version of it so i can learn some new things, and build a nice GUI version of it.[code]So what i have managed to determine is that the current app scans the folders contents for the CRC32 Checksum, and renames based of that, since the 456.bin's CRC32 Checksum was 2274F80B, and in the text file 2274F80B is found here 'WWF - Rage in the Cage (T-81015)(U)#2274F80B#'So now i have determined game identification is based of the CRC32 checksums, how would i go about coding a similar ap in vb.net?first i need to make the app scan a folder, but how to return crcchecksum? and then rename if check = XXXX? If MD4 sums are easier/simpler i can use those instead, im lookin at a few hash app sources now, so i think i can see how to get the md5 but not the crc32 yet, or how to rename the 2 files and folder based of the text file.
View 6 RepliesHow do i exactly check internet connection speed.I have searched around google and found out a method w/c will Download a file like 1mb size, then it will calculate the speed.
View 1 RepliesI need to be able to change a path inside a document ( a config file to a program) to the current directory of the application im creating in VB so the text file looks something like
Quote:
something=234
blabla=io
ServerRoot=C:Server
i need to change c:server
I am using net 2010 net framework 2 & w7 In windows explorer I want to move or rename a file but I get a windows message with a heading "File Access Denied" you need administrator permission to do this In my vb code I want to move the same file but get an error, the security on the file is "Read & execute" and "Read" How do I detect this before the code for moving & also set the permissions so I can move it with vb code.
View 6 RepliesOn an xp system using VB 2008 exprees, I'm trying to write code which will change a file's permisions when run from a non admin account. To do this I need to now how to run the code as an administrator. I've got the code to change permissions working, I just don't know how to run it with an administrator's credentials. The code is:
Imports System.IO
Imports System.Security.AccessControl
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code].....
How can i change a RTF file to a HTML file in VB.NET
View 1 RepliesI'm using Visual Studio 2010 / VB / dot net 4.0, and I have a drop-down menu in my left column that switches resource languages for the end user. It reads like this:
--------English ------- <<- Engish is always the default top language option
French |
Spanish |
[code].....
in my program have 2 textbox-textbox1 and textbox2. 2button-Open and Save. and 2radio button-csv and shp. the situasion is when user 'Open' user will select any file(e.g:hello.txt) and it works-C:\Program File\Document\hello.txt display on textbox1. Now if i want select radio button whether csv or shp the output will display on textbox2 and change the C:\Program File\Document\hello.txt to C:\Program File\Document\hello.csv(if i select csv).
View 1 Replies