I use this function to convert file to bytes array:
Public Function ConvertToBytes(ByVal path As String) As Byte()
Dim _tempByte() As Byte = Nothing
If String.IsNullOrEmpty(path) = True Then
Throw New ArgumentNullException("File not exist", path )
Return Nothing
End If
[Code]...
I have a simple problem (I think). I would like to get the CRC of this array of bytes
0x0 0x7E or 0 7E or 0
Anyway the one calculator I use gives me: 78F0 or 78 F0 (Hex). Anyway, I think its CRC16 but im not sure. So if anyway can show me some code to give me a CRC calculation that matches (78 F0 or 78F0), that would be great, Im not sure if you have to include 7E or not
I can download files from a website, and i am using:
Try
My.Computer.Network.DownloadFile(Download Path, Destination Path, "", "", False, 60 * 1000, True, FileIO.UICancelOption.DoNothing)[code]....
And, when i do try downloading some files, they come as empty.They do download, and the folder has the succeeded files, and some files are empty..Is there a way to check if that folder has 0 byte files, and if it does, delete the files that are 0 bytes, OR delete the folder if whole folder is 0 byte..
I have a byte array and I need to get 4 bytes from it at a certain location(16) but I don't want to convert it to a integer or anything just keep it as 4 bytes to store in a variable.
View 1 RepliesIn web service I have function that return bytes array. Now, I call it from VbScript and I need to catch result of this function. How I can catch result of this function in value that is gone be like a value that function return (bytes array)?
View 1 RepliesI need to get the bytes from an array of bytes starting at a certain index and for a certain length (4), how can get this? Note: I don't want to use the Array.copy sub as it is not a function.I need to put it in something like Sub MySub([arguement as byte()]the_function_I_Need(Array, index, length))
View 2 RepliesI have a byte array containing bytes from a file(see my last questionnow I want to get the second lot of 4 bytes from the array and convert them to an integersomething like bytearray.get(4[start],4[length])
View 2 RepliesI have a bluetooth pen that I need to send an array of bytes too, can somebody offer advice on how i create an array of bytes for the following:0x68 0x00 0x02 0xFF 0x0A (in the guide this is the array of bytes I need to send)
View 1 RepliesI need to do some operations that require converting array of bytes to string and the other way. After struggling with it for a few hours I found out the core of my problems. Look at this piece of [code]...
View 5 RepliesDim sum As Byte
Dim Trans_Array(_64K, 2) As Byte
Const _64K As Integer = 65536
sum = 0
For i = 0 To 15
BinaryStream.Write(Trans_Array(Address + i, RIGHT_FILE))
sum = (Convert.ToByte(sum + Trans_Array(Address + i, RIGHT_FILE)))
Next
I can't figure out how to calculate the checksum of the bytes from array.
I have an address in the type 'array of bytes' (example):
81 ?? ?? 02 53 02 d0 27
To mess with it in visual basic, I use the format in Hex:
&H81 &H02 &H53 .....
I do not know what 'put' in relation to the 'question marks' I've tried:
&H??
&H_
&H00
And even leave it blank.
I just can't get it to work. I have an array of bytes, read from a png file. I'm trying to write a (very) simple HttpHandler to render the image:
context.Response.AddHeader("Content-Type", "image/png")
context.Response.BinaryWrite(bytes)
context.Response.End()
[Code].....
I have a long byte array.I need to eliminate the initial 16 bytes. Is there a shortcut do it?
View 2 RepliesI need some code to calculate the CRC16 of array of bytes.
Example: 00 or 0x0.
The problem I run into is that the CRC I get with a calculator I use is: 78F0.
So 00 = 78F0.
Problem is I dont know what type of CRC16 they are using or anything else. But I would like to make the same calculator in Visual Basic.
Although I think for the Polynum they are using: 0x8408 and I believe the initial value is: 0xFFFF
Here is some code that supposibly is the calculation:
// this function calculates a CRC16 over a unsigned char Array with, LSB first
// @Param1 (DataBuf): An Array, which contains the Data for Calculation
// @Param2 (SizeOfDataBuf): length of the Data Buffer (DataBuf)
[Code].....
unfortunately I cannot resort to C# in my current project, so I'll have to solve this without the unsafe keyword.I've got a bitmap, and I need to access the pixels and channel values directly. I'd like to go beyond Marshal.ReadByte() and Marshal.WriteByte() (and definitely beyond GetPixel and SetPixel).Is there a way to put all the pixel data of the bitmap into a Byte array that works on both 32 and 64 bit systems? I want the exact same layout as the original bitmap, so the padding for each row (if it exists) also needs to be included.Marshal doesn't seem to have something akin to:
byte[] ReadBytes(IntPtr start, int offset, int count)
Unless I totally missed it..
Is it possible convert an array of bytes (PNG format) to image and then, show it in a picture box control?
View 3 RepliesI need to send a structure which contains structure to a socket server but i am abit lost here.Structure example
'example of first structure
structure firstStruct
Dim headerName as u
[code].....
I need to move bytes in byte array.
Dim data() As Byte = {&HE4, &H96, &HA3, &H47, &H42, &H4A, &H80, &H90}
I need to make so that the first two bytes would be deleted and the rest moved to the first one's for example:
Delete: E4, 96
Move: A3 and all the rest to the place where E4 was. (|A3 = 0|,|47 = 1| etc.)
In C++ it's possible to do it like that:
unsigned char data[]={0xE4, 0x96, 0xA3, 0x47, 0x42, 0x4A, 0x80, 0x90};
data+=2;
how to do this in VB.Net without making a new byte array and then using a loop to put the all bytes in that place - it would be too long and would use more resources.
I'm concatenating data files, but the problem is that I'm seeing some extra bytes where the files are joined. The new file has extra bytes. I had thought this was maybe a problem with encoding.Here are the methods that I've tried to use to concatenate the files. The first example I'm getting extra 0xA0 0x00 bytes.
Dim inputfiles() As String = Directory.GetFiles(sourcedir, pattern)
Dim bufSize As Integer = 1024 * 64
Dim buf As Byte() = New Byte(bufSize) {}
[code].....
I need to read a binary file. The Byte-Ordering in this file is different from the Intel-Standard. In good old FORTRAN I've used Equivalence-Statement in such cases (For example Defining a 4-Byte-Integer-variable and 4 Bytes at the same memory location / read the file as bytes / store them in the neccessary order / access the memory using the Integer-Variable). In VB dotnet I programmed a solution using shift-operators:
[Code]...
I would like to know if there is any other way than using WriteableBitmap to convert the current screen into array of bytes.Because I am trying to get a screenshot of Esri map, but I am getting "pixel access not allowed" error
View 2 RepliesI have a string of bytes which I am reading from a microcontroller via a serial port which is as follows : 02 10 18 14 CB 73 43 D3 14 00 0D 00 09 00 1B 00 04 B8 3C 00 00 24 00 30 AB
I would like to write some code to place each the bytes into an array with each element of the array consisting of one byte each.
How can I efficiently find the location of the first instance of a four byte sequence within a byte array? Is there something more efficient than looping through the whole array, or a built-in method?
I'm searching through a byte array for a pair of CrLF. I can't convert it to string for an InStr first because I need the position of it in the original byte array.
I am trying to figure out the location of this, as it delimits between a string portion and a binary portion, similar (well, exactly like for this part of it) to an HTTP header. There is a string portion, and two CrLf before the content begins.
When looking at an array of bytes from a stream for a multi-page tiff document, can you determine where one page stops and another begins? I want to take a multi page document, let's say 50 pages and allow a user to pick different pages of that to make other muti-page documents.
View 1 RepliesI need an array and each item in the array is an array of bytes like this , but I'm not sure how to do the :Dim xx as array
xx(0) *as byte* = {&H12, &HFF}
xx(1) *as byte* = {&H45, &HFE}
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.
View 1 RepliesOk 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.
View 2 RepliesI 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]...
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].....
I am trying to work my way through the NerdDinner tutorial - and as an exercise I'm converting it to VB as I go. I'm not very far in and after having gotten past the C# Yield statement I'm stuck on Shared VB Array Initialisors.
static IDictionary<string, Regex> countryRegex =
new Dictionary<string, Regex>() {
{ "USA", new Regex("^[2-9]\d{2}-\d{3}-\d{4}$")},
[code].....
