VS 2008 Add 1 Byte To The File?
Jun 11, 2010I would like to make application which can add 1 byte to the file. Is this possible ? I dont know here to even start?
View 1 RepliesI would like to make application which can add 1 byte to the file. Is this possible ? I dont know here to even start?
View 1 RepliesSeen this in
Dim file as FileStream = New FileStream("myfile.text", 0, FileMode.Open, FileAccess.Read)
Dim reader as BinaryReader = New BinaryReader(file)
Dim data as Byte() = reader.ReadBytes(CType(file.length, Integer))
Why is the file.length being converted to Byte, when Integer range is greater, and the code not failing to do so? I don't understand.
How do I read a raw byte array from any file, and write that byte array back into a new file?
View 3 RepliesWhy does C# define Byte+Byte=Int32 instead of Byte+Byte=Byte like VB?
View 1 Repliestrying to find a decent answer for my question; I do have a utf8 file which I (down)load, manipulate and wanting to save back again.The result always is that the file I produce is not in utf8 format;
Dim fs2 As New FileStream("c: est.dat", FileMode.Create, FileAccess.Write, FileShare.None)
Dim w As New BinaryWriter(fs2, Encoding.UTF8)
[code].....
If i use a stream to modify few bytes in a file without changing the total number of bytes
does the stream rewrite all the file even if just few bytes have been replaced?
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 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]....
I'm making a program that will patch a program with a new Exe. Its all working with this code
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles patch.Click
patching = True
[CODE]..........
I get an "Could not find file 'System.Byte[]'." error.
how to upload file using fileupload control into sql database. I have class where i created insert function and getting info frm the .aspx.vb file
Class File
========
Imports System
Imports System.Data
Imports System.Data.SqlClient
[coe]....
Is it possible in VB to truncate a larger data type ( an int with a value greater than 255) to a smaller one, say a Byte (which only goes up to 255) in a way such that the 8LSBs of the integer are copied to the newly created byte. I have tried this using CType with the following code, however it does not work.
Dim TestByte As Byte = CType(Test, Byte)
Where the variable "Test" is an integer with a value of 419. This code always results in the Overflow exception.
[code].....
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 would like to create a function so that I can pass a string and it will return me the binary value, I will use this later in other parts of the script but I am getting an error that I don't understand.
Private Function ConvertToMD5(ByVal OldPassword As String) As Byte
Dim NewPassword As String = ""
'The string we wish to encrypt
[code]....
On the "Return hashedDataBytes I get "Value of type '1-dimensional array of Byte' cannot be converted to 'Byte'"
I had made an app that opens a file and changes a hex byte then when I click another button it saves it.I am now thinking of making an app that will change some hex bytes to something else, but the catch is that not every file will have some of the hex bytes that others will. Like I want it to search for 71, 13, 31, and 11, and change them to 15, but not all files will have say a 71 or some might not have a 13 or a 31...Also, if there was a couple of bytes in a row that I needed to change, say F132, would I be able to search for all of that at once, and then change it to something like F133?
View 3 RepliesHow could you convert a IntPrt to a Byte Array (Byte()) ?
View 19 RepliesI have a byte array that I convert into a string like so Dim byt As Byte() = New Byte(255) {} s = New String(Encoding.ASCII.GetChars(byte))My question is when I look at the string in a debuger its clearly a normal string but when I compare it to what I know its supposed to be it doesnt equal. So i did a quick check and for some reason its return a string thats the length of 256 characters. So i did a s.trim and it still is 256 characters long.
View 1 RepliesI would like to know how to convert a unisgned byte to signed byte
Atm I got this
a
Function readSignedByte() As SByte
'-128/127
Dim b As SByte
[Code]....
it doesn't work one that well works for numbers positive over 127 if lets say ReadByte() has 128 it would give overflow error which I don't want it to give I would like it to overflow the number to negivate value aka its signed value.
given my code below, I'm trying to figure out how to create an array of 1 byte containing 7 bits. So the byte in the array would contain 0111111 to correspond to mData_Out's boolean values. How would I change the following code? [Code]
View 8 RepliesI am trying to write some code to get a kinect for windows sample running, which is originally written in C#. I get stuck with translating the following C# code to VB.NET:
byte intensity = (byte)(~(realDepth >> 4));
What is the VB.NET equivalent for the code above? how to translate the "~" code sign.
I want to write a byte array to the end of an existing file. How to append byte array to file?
View 4 RepliesFile.txt contains both chinese and english characters.. English characters are 1 byte and Chinese characters are 2 bytes.
View 9 RepliesBasically what I'm now trying to find out is simply how to convert an Executable file into byte or byte array as i've heard it called, and then back again. I had a friend used to do it with a program in VB6 a few years ago where he would convert the EXE into byte and store it in a sql database and then his boss would be able to retrieve it later on when he was out on business overseas and it seemed to work very well.I'd like to know how to do it in VB.NET, however after going through some sites using google search I have come up short.
View 6 RepliesI am retrieving an image from the SQL database into Byte() variable in vb.net
Dim img as byte()=dr(0)
How do I create a file in my C:images directory from the above img.
I want to read the img and then create a file with name bimage.gif
1.txt content:
1224hafhal2948102
My code:
Dim data() As Byte = System.IO.File.ReadAllBytes("c:1.txt")
label1.text=data(1)
How do read first byte,last byte(get the value) from my text file? From my file, i want read the first char "1" and last char "2" through read byte method and show in label.
i m using readallbyte method to read my log file. How to get first five bytes in every lines to do the comparison?
Dim data() As Byte = System.IO.File.ReadAllBytes("c:1.txt") 'read log file in bytes
Dim lines() As String = System.IO.File.ReadAllLines("c:1.txt") 'read log file in lines
Let's say:
For i=0 to 100
If lines(i).startwith("212330") Then
'code
End If
Next
The value 22330 is read from the file in byte. But i not sure whether can find the byte value by using readalllines method.
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]....
View 5 RepliesIm using this code to upload a file into a table as byte: The ScreenshotPath is "Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) & "\Screenshot.gif""
Public Function UploadScreenshotToMySQL(ByRef ScreenshotPath As String) As Boolean
Try Dim MySQLCommand As New MySqlCommand
With MySQLCommand
.Connection = MySQLConnection
[Code]...
It says that a fatal error acquired. I dont see any errors
i tried saving the string 1995030 to file as byte as a hex value.Used the following lines to do this by hand:
Dim fs As New FileStream("test.txt", FileMode.Open, FileAccess.ReadWrite)
fs.WriteByte(&H2D))
fs.WriteByte(&HB3)
fs.WriteByte(&H56)
This works as expected and everything is fine until this point.Now i tried to solve this problem by code.Tried the following:fs.writebyte(&H(str))Str contains the actual hex value to write.
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?
View 3 Replies