Byte Swapping "54h" Command From Little Endian To Big Endian Using .NET?

Oct 20, 2011

I am trying to communicate with a Omega Instrument using serial port communication. Omega Instrument has Motorola Format and i am using VB.NET as programming language. I have to perform byte swapping and send command 54h to the Omega Instrument so that it will display RMT.


VS 2008 Reading Bytes (Little Endian/Big Endian)?

Apr 14, 2010

I need to be able to read bytes in Little Endian and in Big Endian as well. Is this possible to do in VB? I know that VB reads in Little Endian by default, but I also need to read in Big Endian.

I have tried this:

Dim i1 as Long
Dim fs As New IO.FileStream(filename, IO.FileMode.Open)
Dim br As New IO.BinaryReader(fs, System.Text.Encoding.BigEndianUnicode)


This return the value "1616183296" when it is supposed to return "21856". I've opened the file up in Hex Workshop, and looking at it in Little Endian, I do get the value of "1616183296" and in Big Endian, I get the value of "21856".

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Oct 26, 2009

I'm converting a stream of bytes from a network packet into a specific struct, and vice versa. For example, when converting a short back and forth, my method looks like this:

myShort = buf(0) + (buf(1) * 256)
or the other direction:
buf(0) = myShort mod 256
buf(1) = myShort 256

When it comes to a 4 byte integer, after some experimentation I found that converting from the byte array to integer is done this way:

myInt = buf(0) + (buf(1) * 256) + buf(2) + (buf(3) * 256)

Basically adding two shorts together. I'm not quite sure to do the reverse of that, to fill the 4 bytes from myInt.

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Jul 26, 2011

I'm working on a project that's going to be deployed via .NET on Windows and via Mono on Linux; the same data needs to be exchangeable between the platforms, including where platform A is Little-Endian and platform B is Big-Endian.Where text is concerned, I know ASCII/Unicode is natively Big-Endian, so there's no problem with that.Where numbers are concerned, I know that byte arrays have to be reversed on Big-Endian platforms to store the data in Little-Endian format.But what exactly is the 64 bit value output from System. Date Time.ToBinary?Is this a number representing the number of seconds elapsed since Jan 1 1970, is this some kind of serialized attribute that outputs some DotNET-recognizable value, or what?Does this byte array need to be handled differently in Big and Little Endian environments?It never hurts to try. In a worst case scenario, you'll learn from it.

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May 27, 2010

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Apr 29, 2010

Sample: EscreveByte = Val(AscW(Letra)) sw.WriteByte(EscreveByte)


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Aug 7, 2010

Why does C# define Byte+Byte=Int32 instead of Byte+Byte=Byte like VB?

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How can i do this with coding?

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Nov 6, 2009

I display some values in a combobox that come from an array.By default the selected index of the combobox should be the first item.

If cboAtt.Items.Count = 0 Then
For i = 0 To nums(att)


This works perfectly, but now I want the combobox to display the new (initial) value that is swapped, except than when I do that the cboAtt_SelectedIndexChanged event is triggered which results to an infinite loop --> crash.

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Nov 19, 2008

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May 20, 2011

vb 2008 drag and drop replacing text in txt1 with text intxt2 and replacing txt2 with txt1 and all the other textboxes. more than one time. So far I h get it to swap the text from txt1 to txt2. example txt1 = "one" and txt2 = "two" after drag and drop txt1 = "two" and txt2 = "one" now we need to keep swapping with 2 more textboxes. Here is the sode so far.

Class Form1
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Jul 22, 2009

This I'm almost certain is an easy problem for those with more experience than me. I just need a routine that trades the places of 2 members of a collection class.

For example: If there are 5 objects stored in a CList of() collection class, I want to swap item # 3 and #5 (or any pair of indexes), what would be the code?

This simple problem has my head spinning because once you remove a member all the indexes change.

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Apr 22, 2012

Create two arrays, ask the user to populate them and display both arrays Swap the contents of the arrays using loops and then display the content.

What is the best method to have the end user populate an array? I am doing this as a windows form. Have multiple text boxes that they have to fill out? Set the elements of the array to the text box values? And how to swap the contents at run time is something I am not sure of. Isn't there a Array Swap function or something? Here is what I have so far:

Note: the bottom section was a test..and it isn't working as expected.



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Nov 8, 2010

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Feb 19, 2010

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Here is the code for the initial startup of the project:
Public Class Form4
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[Code] .....

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I've set up a test database to begin unit-testing an app that I've recently been added to. It is a 3-tier design (presentation layer, BOL and DAL) and this is my first time writing unit tests. I've decided to start at the BOL and I figure the best way is to swap out the ConnectionString (which has been passed along as a Shared String) with one that points to my new test database. However, I don't wish to change any production code. I simply wish to somehow redirect the app to the test database during unit tests.

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Dim RDLength As Int32
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I'm not sure if I have this right to begin with because I can't test it without having it completed.

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On the "Return hashedDataBytes I get "Value of type '1-dimensional array of Byte' cannot be converted to 'Byte'"

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Atm I got this

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