I have some data, stored in a byte array, compressed with LZSS compression. I've crawled the net for the last 2 days trying to find some code to decompress this data without success. Has anyone come across a suitable routine that can help?
View 2 RepliesI have read a byte array called compressed_byte_array() from a file. This array is compressed using the zlib compression Deflate (RFC1951).
How would I decompress this array and store it in another array, let's say decompressed_byte_array(). I probably have to use DeflateStream and I have tried a few methods, but always ending up with a error message.
I'm writing a C# application that reads data from an SQL database generated by VB6 code. The data is an array of Singles. I'm trying to convert them to a float[]
Below is the VB6 code that wrote the data in the database (cannot change this code):
Set fso = New FileSystemObject
strFilePath = "c: emp emp.tmp"
' Output the data to a temporary file
[Code]....
The problem here is the VB6 binary to string conversion. The VB6 string char is 2 bytes wide and I don't know how to transform this back to a binary format I can handle.
Below is a dump of the temp file that the VB6 code generates:
And here is the dump of the data as I read it from the database in (=the VB6 string):
I am attempting to retrieve byte array data from one in memory Datatable row and column and store the value retrieved in a different in memory DataTable row and column. The second DataTable is not associated with a database. I have not been able to save the byte array data in the second DataTable.
[Code]....
I'm trying to save binary data ( convert from image) to byte array in mifare card with acr 120 reader.
image : 687 byte
mifare : 1 k
My problem its can't save but I am trying to save char data its work.
<div class="body">
I have a word document data been inserted into database as VarBinary(max) column. Now, i need to fetch this information and display in my aspx page directly.I am getting this value from database in Byte Array and try to convert that into string and add that string to a div.I am using the below two ways: In both the ways first i am getting them to a temp txt(in 1st way) and doc (in 2nd way) files and reading back those file I am using .net 2.0 frame work
Write Method:Writing data to temp file(either doc or txt based on the filepath which has filename)
Eg: filepath: "c:temp.doc"
Public Sub writeFileData(ByVal strFilePath As String, ByVal bytFileData() As Byte)
Try
[code]....
Failure reasons: I am getting the output as some symbols, prob because the server is not able to read the format of the word content.how to read the word document data in binary data to a string.
I am trying to Convert a data field stored as IMAGE ( SQL Server 2000) using Java to a byte array using VB.NET Java uses signed numbers for a Byte array where as VB dosent. Can somone point me to how I can covert java byte array to VB byte array?
View 2 RepliesObjective: 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.
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]....
I have put together an array for data from two text boxes to be stored in. This works fine at the moment. I am now looking to build some form of array that will have some stored data in it already, so that someone can select the information they require from a listbox.
View 7 RepliesI 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'm new to .net. I would like to know how to convert a text data in string or in a file into a simple byte array[ ] format.
View 3 RepliesI have 9 1-dimensional arrays of bytes and 1 of them is empty, I want to make the empty one equal to the others put together like you would a string:
Dim bla As String = "bla" & "bla" & "bla"
'now bla = "blablabla"
but instead:
[Code]......
How do I read a raw byte array from any file, and write that byte array back into a new file?
View 3 RepliesI've inherited a tested function that processes incoming data from a .NET Serial Port. (Dim RXBuffer as string = serialport1.ReadExisting) I've written a different part of the application that processes a byte array as received from an asynchronous .NET socket.
Is there a way I can convert the byte array into a string as if it arrived from the serial port?
I would prefer to rewrite a very long 'if statement' into byte array functions syntax that look like:
dim b as boolean = IsBitSet(state_buffer(i), j) 'rather than:
dim b as boolean = (Asc(Mid(RXPacket.Pdu, CInt((i - (i Mod 8)) / 8) + 1, 1)) And CInt(2 ^ (i Mod 8))) > 0
I have tried to run below macro in excel 2010, but the error pop up and after press debug button, the line "expected_loss = application.worksheetfunction.average(final_loss)" was highlighted. May I know how to solve this problem?
Sub test ()
'Aim: to store data in array and calculate the average of the data in the array
Dim final_loss(1 to 70000) as double
[code].....
How 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 Repliesgiven 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 working on an inventory managment project for a lumber mill. I am currently writing a piece of software to be used on the sorting section of the mill. The problem I am having is when a stick of lumber needs to be cut down in lengt. My current setup has a combo box that is populated with lengths of lumber that we might have (2' - 60'), a "Add" button and a data control (homemade solution with lots of labels, and panels).
The user will scan a tag into the system, and the system pulls up the info from the db. If the piece need to be cut, the user will select the length of the cut, and click the add button. The system will then populate the first line of the data control with the info from the cut (previous piece info, and new length). It also populates a pieceObject struct. This happens for any additional cut that might happen.
The problem I am having is that everytime I press the "Add" button, the length variable will update every length in the piece array.
Here is a section of the code I am dealing with.
piece is a lumberPiece, and pieceAry is a array of 15 lumberPieces
Each time the add button is pressed, the current data is stored into the array, and then the pieceNum is incremented.
[code]...
Recently I have learned visual basic 2008 express edition and developed programs for data crunching and analysis. The VB 2008 express edition has microsoft visual studio 2008 v. 9.0.30729.1 SP and .NET Framework version 3.5 SP1. Now I want to create x-Y (date-Y value) graphs using the crunched data stored in an array list simulating a data base access. I download and installed the "Microsoft Chart Control for .NET Framework " and try to learn to use it within the VB 2008 express edition using the tutorial. It seems that the chart control did not get installed?
1. Do I need at VB 2008 professional to allow using the chart control?
2. Why after installing chart control, there is no change on the items under the NET components within the Toolbox>ChooseItem>.
3. How do I get to use the chart control under VB 2008 express edition.
4. Any code available to generate versatile graphics without using the chart control? Because the chart control has tons of classes already it seems the best is to just use the existing and downloadable chart control?
I am trying to get a count of all the times a byte sequences occurs in another byte sequences. It cannot however re-use a bytes if it already counted them. For example given the string let's assume the byte sequence was k.k it would then find only 3 occurrences rather than 5 because they would be broke down like: [k.k].[k.k].[k.k]. and not like [k.[k].[k].[k].[k].k] where they over lap and essentially just shift 2 to the right.
Ideally the idea is to get an idea how a compression dictionary or run time encoding might look. so the goal would be to get down to just 2 parts, as (k.k.k.) is the biggest and best symbol you can have.
Here is source so far:
[Code]...
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 can open a file in a hex editor and know that each 2 digits is a byte, they are 8 digits in binary correct?
How are they stored in arrays in VB.NET?
So if I have:
Dim xx() as byte =
What would I put after the equals? The hex digits from the hex editor? (This is just a program I'm not going to save, basically I don't want to open files to get etc. I want to put in the bytes in the code.)
I didn't think it fair to post a comment on Fredrik Mörk's answer in this 2 year old post, so I thought I'd just ask it as a new question instead..NB: This is not a critiscm of the answer in any way, I'm simply trying to understand this all before delving into memory management / the marshal class.
In that answer, the function GetByteArray allocates memory to each object within the given array, within a loop.Would the GetByteArray function on the aforementioned post have benefited at all from allocating memory for the total size of the provided array:
Dim arrayBufferPtr = Marshal.AllocHGlobal(Marshal.SizeOf(<arrayElement>) * <array>.Count)
I just wonder if allocating the memory, as shown in the answer, causes any kind of fragmentation? Assuming there may be fragmentation, would there be much of an impact to be concerned with? Would allocating the memory in the way I've shown force you to call IntPtr.ToInt## to obtain pointer offsets from the overall allocation pointer, and therefore force you to check the underlying architecture to ensure the correct method is used*1 or is there a better way? (ToInt32/ToInt64 depending on x86/64?)
*1 I read elsewhere that calling the wrong IntPtr.ToInt## will cause overflow exceptions. What I mean by that statement is would I use:
Dim anOffsetPtr As New IntPtr(arrayBufferPtr.ToInt## + (loopIndex * <arrayElementSize>))
I've read through a few articles on the VB.Net Marshal class and memory allocation; listed below, but if you know fo any other good articles I'm all ears![URL]..
A c# class's single dimension byte array contains socket level instrument sensor data as per:
public static byte[] frameData
is there is any direct method or function in array class that can check if any given byte array is a subarray of other array?or should i loop through the each byte of main array to see if smaller array exists in that or not?
View 2 Repliesgiven the following Sub, how would I initialize byte array 'temp'to zeros and give it the length of the incoming byte array passed into the subroutine?
Sub ReceivePacket(ByVal buffer As Byte())
Dim temp() As Byte 'initialize to zeros and length of buffer
temp = buffer.Skip(17).ToArray()
End Sub
I have an array defined As string and the value stored in site is like "7E", "A1" and so on. But in order to send out this array through serial port. I need to change the the array to As Byte instead of using As String. How can I convert it?
View 8 Replies