I am trying to compare two long bytearrays in vb.net and have run into a snag. Comparing two 50 meg files takes almost two mins so I'm clearly doing something wrong. I'm on an x64 machine with tons of memory so there are no issues there. Here is the code that I'm using at the moment and would like to change.[code]...
View 5 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.
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'm trying to combine 2 byte arrays and then create a new byte array that contains the contents of both but running into a problem. The error says 'Source Array was not long enough.' I'm trying to combine HeaderByteArray and bytBuffer into newByteArray. I don't understand what Source Array is not long enough means and how to correct this.[code]...
View 9 RepliesI think there is Copy.to function but i cant find it
View 2 RepliesIs it possible to compare 2 arrays without looping? For this example, I need to compare aryFi.Count to currentarraycount. if aryFI.count>currentarraycount, then I need to add the ones in aryFi.count into a public array named pgarraylist. Since aryFi contains more items, I can't just take the .count-the difference in counts, I need a way to get the items contained in aryFi but not in currentarraycount. EDIT - currentarray is the list of currentarraycount Sounds confusing - but here's an example.
Public pgarraylist As New ArrayList
Dim aryFi As IO.FileInfo() = di.GetFiles("*.xls")
cntdif = aryFi.Count - currentarraycount 'currentarraycount is updated after changes occur and when loading program.
For y = cntdif To 1 Step -1
[code]....
How can i compare two arrays like :
Dim Ar1,Ar2 as array
Ar1 = My.Computer.FileSystem.ReadAllBytes("C:Try.mp3")
Ar2 = My.Computer.FileSystem.ReadAllBytes("C:Try1.mp3")
how can i compare that two?
I am trying to make an intelligent stock pick/dispatch location system at the point of invoice from a stock database. Multiple locations are available to dispatch from, and essentially I want to make efficient dispatch, so if all items purchased can be dispatched from one location, they are grouped and dispatched as such, but if not, it groups what it can and dispatches the rest from wherever the highest stock level is available.Because the number of locations has to be variable, this system is scalable.Because the number of items is also scalable So, instead of listing suitable stock locations, I am now listing the quantity of stock available in each location for the respective items.
Items Locations
_________|__1___|___2__|__3__| - this is location IDs
Item 1 | 3 , 4 , 1 - this is the qty of stock available
[code]....
I can turn this into a string which might be used to split and create arrays
ie
stockDetails = "3,4,1|2,4,0|1,3,1|6,1,3"
Here, the comma separated values are quantity of available stock in each stock location and the pipes separate the individual items, so the table above is translated to the string above.I am not keen on multi-dimensional arrays and don't know how I'd create one without knowing how many stock locations there are.
We can safely assume That the stock quantities are in the correct order to correlate back to the stock locations IDs.
Each pipe separate series of comma separated values will have the same number of comma separated values.I just can't work out how to determine the pick locations! In the above example, all four items can actually be picked from stock location 1, providing only one of each item is purchased. Suppose though a customer bought 2 of item 3. Then the pick would have to be from location 2. All kinds of other scenarios can of course be presented depending on the number of items purchased, the quantity of items purchased and how many stock locations there are to pick from.I started off simply picking from the location with the highest available stock, but that made no sense when stock was available to pick from more than one locaton because we ended up with multiple dispatch locations which was not necessary.How can I analyse these variable length strings/arrays to determine the most intelligent way to dispatch.
I'm trying to determine the highest customers in a single month of the year. I also need to add the corresponding month to that.
View 4 Repliesand i need to convert the image into a text.now anyone thinking that i can just use ocr is unfortunatly wrong i have tried about 5 of them and they dont work because the text in the image is to small for it to recognise it.so i need to search the above image for a smaller image such as this.so by doing this if i get a result saying true then i will be able to go from be there and convert to text.now i know of two way to search an image for a smaller image. first is by going by pixel search and well i can get that to work but it is to slow.the second method is to convert the image to a byte array(beig an image it will be a 2d byte array) and convert the other image to a byte array and then compare.
View 4 RepliesA project requires to allocate a varying number of byte arrays (buffers).
It would be ideal if the following definition would be possible:
Dim ArrayOfBuffers() as buffer(10000) as Byte
The byte arrays must be ordered sequentially because they have to be written to a file by efficient procedures destinationFile.Write(ArrayOfBuffer(3),1000,1000)
The number of buffers will change during program execution sometimes. Therefore it would be nice to be able to do a ReDim on the data structure when needed.
I am in need of encrypting a byte array, but my encryption method that I found strictly deals with strings.
Here are the two pieces of code that I am dealing with.:
The byte array (the bytes that need to be sent encrypted)
Code:
Dim outStream As Byte() = System.Text.Encoding.ASCII.GetBytes(TextBox2.Text + "$")
serverStream.Write(outStream, 0, outStream.Length)
serverStream.Flush()
[Code]....
am trying to pass a structure that contains 2D arrays as Byte from VB.net to a C++ dll. The dll returns the structure with the 1D arrays filled. I am using UnmanagedType.ByValArray to pass the arrays from VB.net to C++.
Sample :
----------------------------------------- Structure -------------------------------------------------------
<Serializable(), StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi, Pack:=1)> _
[Code].....
I am having some major problems with byte arrays. First off the bigger array I have the more values go missing, I originally wanted to make a huge array and just dump like a 100mb chunk of memory in it but when I did that every byte in the array returned 0. So I experimented a bit and found 4kb to be the biggest chunk size to reliably not return 0.. ok I figured I'll just loop the 4kb and glue them back together later but no such luck, after being combined into the main array the bigger the number gets the more values that should be there just aren't.
Here's a code sample:
Dim retval(4095) As Byte
Dim combval(RLen) As Byte
For i = 0 To RLen - 4095 Step 4096
ReadProcessMemory(ProcAccess, i, retval, 4096, 0)
retval.CopyTo(combval, i)
Next i
WriteLine(combval(321603964))
WriteLine(ReadMemory(321603964, 1)(0))
So with the last 2 lines if I pull up some smaller number like 8 digits or so it reports back no problem but anything slightly bigger like the number i have written in there right now is just 0. After some additional research I discovered that the reason why 4kb is the max size I can reliably get is coz that's the size memory chunks are made of, "page" as they call it. Why the memory reading drops off at higher addresses alltho I suspect it has something to do with the way memory is structured and I am just not hitting the startpoint of a page anymore due to an offset or something somewhere.
I declare my 2D lists:
Dim _invoiceitems As New List(Of List(Of String))
Dim _dbitems As New List(Of List(Of String))
Each List is filled like this: Example Code To fill:
_invoiceitems.Add(New List(Of String))
_invoiceitems(0).Add("Code #")
_invoiceitems(0).Add("Quantity")
Well, now i need a third list called (_changesitems) Note that this result with the differences: be the result of subtraction of quantities if this is found (dbitems - invoiceitems).
I have a question about efficient implementation. Lets say I have two arrays:
One array is all possible items in a house: Table, Chair, TV, Fireplace, Bed
The other is an array of items in a particular house: Table, TV, Bed
I also have two list boxes:
1. listbox for items in the house - the "HAS" list box
2. listbox items not in the house - the "NEEDS" list box
I need to list the items already in the house in the "HAS" list box as well as the items that are NOT in the house in the "NEEDS" list box. It seems to me that nested "For each" loops would be a start to solving this problem but I am not exactly sure which case needs to be nested.
I want to put the matches from a regular expression into an array or something that i can use to compare it with another array, it being the lines from a txt file names "users.txt". Code A:
[Code]...
And the second code will do the exact same thing. What i want to do is compare each line in the Txt file (Code B) to the reg expression matches (Code A) and for it to alert me if any is missing. So it needs to compare Code B to Code A. (PS. Order is irrelevant, it can be in different places as long as its there) In my other thread i got a little confused and couldn't clearly communicate what i was trying to do.
I have a program that has to store a pre-made array that contains strings (moviename, moviegenre).
I setup all the items in the array already, example:
moviearray(0,0) = "Green Lantern"
moviearray(0,1) = "Action"
For this example, if the user selected "Green Lantern" from my listbox, then the label needs to display "Action". So yeah, it's a 2-column array: first column = movie name, 2nd column = movie genre. Now, I have a listbox containing all of the movie names (not entered by the array, but entered through the Item property of the listbox). When a selection is made in the listbox and a button is clicked, I need to have the genre of the movie output to a label. That is where I am stuck, I just can't figure out to compare what's in the list box with the first column of the array to output the 2nd column to the label.
i have tese two arrays
if i find filter_ids in stroutids i want to remove those from stroutids array
Dim strOutIDs() As String = Split(OutIDs, ",")
Dim Filter_Ids() As String = Split(Me.ucIo_Entry.Filterd_RowIds, ",")
[Code]...
I have an aspx page which houses an iframe. When a button is clicked, a WCF is called to produce a PDF which is read into a byte array. I was storing the byte array in a Globals.vb file like this:
Public Shared PDF_Data as Byte()
The global was loaded from the parent aspx page like this:
PDF_Data = MyWCF.Create_PDF_File(SomeVariable)
After that, the iFrame's src was set to a blank aspx page, which had the following code in the page_load event:
'Write the PDF binary data to the screen (viewer)
Response.Clear()
Response.Buffer = True
Response.ContentType = "application/pdf"
Response.BinaryWrite(Globals.PDF_Data.ToArray)
However, realizing that this application will have several users who will get different PDF documents, I have learned that this is not the way to go. My shared variable would be accessible to all users, a big no-no.However, I am stumped as to how I'm going to store the byte array and make it available to a child aspx page from it's parent.
The relevant code below is not achieving what I hoped it would. I intend for
1. SerialPortBufferTemp to be used as the container for each Serial Port Read.
2. _buffer should contain the resultant array from two separate Reads, the second appended directly after the first.
(E.g. 60 bytes read on the 2nd Read will be appended to the 168 bytes received on the first Read (228 total resultant byte length))
The problem with my code below is that _buffer has increase in size from 300 bytes to 600 bytes, skipped bytes 168 to 300 (leaving them all zeros) and added the remaining 60 bytes from the second read beginning at _buffer[300].
private List<byte> _buffer = new List<byte>();
byte[] SerialPortBufferTemp = new byte[300];
serialPort1.Read(SerialPortBufferTemp, 0, iBytesRead);
if (iValidRecordCtr == 0) {
_buffer.Clear();
[Code] .....
Working with System.Cryptography, I'm noticing that data arrays up to a certain size will either conform to the size of the Initialization Vector (IV) or the size of the Key provided. So with a 48-byte Key and a 32-byte IV, up to around 42 bytes of data will encrypt to 32 bytes and 44+ will encrypt to 48 bytes of data. I've tested this with a variety of data arrays, and it seems to always come out the same... but I have a concern that higher byte values in the original array may result in longer encrypted arrays.
how or whether I can construct byte arrays that will be guaranteed to come out of Encryption at a pre-determined size?
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.)
As a continuation of my other thread, "Finding A Pattern without a string Array (http:[url]....)", I would like to continue asking questions about enhancing a scanner with a few things:
1. Here is my code for finding signatures in a file:
'First the Signature Class:
Interface Signature
End Interface[code]......
Im looking for a method to parse incoming byte arrays. The code i use now for recieving is:
[Code]...
Why does C# define Byte+Byte=Int32 instead of Byte+Byte=Byte like VB?
View 1 RepliesI 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]....
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].....