I have a variable as a single. what is the value of second byte of my variable.or what is the value of third byte of my variable value in memory.?in c language we use at like this *(char(&x)+1)which method do the same thing in vb.net
View 1 RepliesI have a Generic List of Bytes with Hexadecimal values stored in it. for example, elements 0 to 3 contain 42 9E D1 EC which as a single, is equal to 79.41. I've tried using:
dim foo as string = ""
for i as integer = 0 to 3
foo = foo + system.convert.tosingle(byteArray(i)).ToString
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I am totally new with VB.NET. I have started coding for Modbus protocol. The response that I receive from the slave is as below -
01 = byte slave id
03 = byte function code
04 = byte -no. of bytes sent by slave
00 = byte(8 bits) (Lower Register MSB)
00 = byte(8 bits) (Lower Register LSB)
64 = byte(8 bits) (Upper Register MSB)
00 = byte(8 bits) (Upper Register LSB)
2bytes for crc
Now I want the value of 64 00 00 00 into floating point number in Vb.net . I think in vb.net its single as its 32bit floating precision number. Now the bytes that I need are 00 64 00 00 but if i process in this way the output is different, so I tried manually putting the data into the byte array and found out that I need 64 00 00 00 to be processed so that i can get desired output.
i would like to convert a single byte to a string.
dim mybyte as byte = &h11
dim mystring as string
i tried
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Ok, this is going to be a bit bizarre, but I'm looking for something strange, so all suggestions are welcome:I have a function that takes a single byte as an argument. From that byte, without using any random function, I need to create two other random bytes. I specifically cannot use the Random object, but fortunately, the other bytes do not need to be random relative to the argument. Also, the argument is random.
Therefore, one other byte can be created by XORing with &HFF, which will create the inverse of the argument. Since the argument is random, the inverse is also random. I need one other technique that will create that last pseudo-random byte. I thought about bit shifting, but that results in something quite a bit less than random (it will be biased high or low, depending on the bit shifting).
One possibility that I am trying is to use CByte(100000/arg). Does anybody have any other suggestions?
EDIT: The result of that equation for all values of the argument is a very interesting pattern. It will probably be fine, but I'd still take suggestions.
I have a byte array with 512 Elements and need to get and set a single bit of a byte in this array.The operation must not change any other bits, only the specified one.So if I have a byte like &B00110011 and would like to change the third bit to 1 it should be &B00110111.
Like this:Dim myarray(511) as byte myarray(3).2 = 1 ---> This would change the third bit (start counting at 0) of the third byte to 1 I know it should be easily possible using bit-masking but I don't have the time to try for days to get it working.
We can declare a byte variable like this, for hex '88'
Dim bytes = New Byte() { &H88 } My case, 88 is assigned to a variable, hexvalue
How to declare the byte with the variable hex value?
Dim bytes = New Byte() { &H & hexvalue }the above throws syntax error.
I'm trying out a program which I found on the net. Why is it necessary to put to curly braces at the end of the statement? It gives an error: "Byte has no constructors". Dim data As Byte() = New Byte(1023) {} I can't put the code like this either, it produces the error "byte cannot be a 1-dimensional array".
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I have a byte variable that stores picture. How to clear the value of this variable.#
View 2 RepliesTry to store hex value D9 to byte variable.
Dim x As Byte
x = encText.GetBytes(&HD9)
When Debug.Print for check, answer show hex 83 (decimal 131). Why it cannot store correct hex value?
I understand the concept of bytes and declaring variables to save on processing space. I understand that the max value that can be stored in a byte is 255. I cannot seem to wrap my head around my current issue. I don't have much experience working with byte manipulation.
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Why does C# define Byte+Byte=Int32 instead of Byte+Byte=Byte like VB?
View 1 RepliesI have a strange problem with the following code:
Code:
Private Sub Listener()
Dim infiniteCounter As Integer
[code]......
how can i, for example add a datum from the rs232 with other variable here is my code:
Dim ii As Byte
Dim c(100) As Char
c = Me.SerialPort1.ReadExisting()
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I'm a newbie in VB.NET, I am trying to directly set the bits of a single variable. For example - dim afloat as single afloat = &h0000000c afloat will then be set to to '12'. However, I wish to actually set the bits of afloat to &h0000000c, which will give a different value.
View 1 Replieshow to store multiple variables in a single one to be stored in string?I have some 5 linq variables which am trying to store in a single string...Can you tell me how should i do so?
View 3 RepliesSince I like to use the ReadAllBytes and WriteAllBytes methods to save my variables to disk, I have had no troubles thus far with Integers.It has been easy to convert a short integer into a string of two bytes to save them using WriteAllBytes as following example:-
ReDimxji(0 To 601)
For I% = 0 To 300
J% = hbs(I%)
[code].....
But now I want to store some Single variables using WriteAllBytes, so I need to convert my single variables to a string of four bytes for each.
I have been searching the internet trying to understand in its simplist form why this behavior happens.
Dim mysingle As Single = 456.11 Dim mybool As Boolean = mysingle = 456.11
In the lines above mybool becomes false. I found this behavior when putting the single into a double I found extra digits showing. The .net documentations states a single is an approimate value I gatehr a single is a 32bit floating point number? But why are extra digits appearing when I have explicitly said what the number is.. surely the memory should store that numbers either side of my number are 0 to fill up the memory location?
How can I get access in a fast way to the single bytes that form a double variable?
In pseudo-code I want to do something like this:
Dim myDouble as Double
Dim myArray(7) as Byte
myArray = myDouble
'continue doing things with the single bytes
The code is meant for use in a I/O-handler. The double-variables have to be sent / received via TCP. For this purpose they shall be put into / assembled from I/O-buffers.
How do I Change the variable strLettersGuessed into a single-element array
View 4 RepliesI have a variable defined as Object(,) that was read in from excel. Without getting into a for/next, is there a simple way to read the c-th column or r-th rown from that array into a single variable?
View 2 RepliesI have a very large number of tables with data in the following format:
A X Y Z
1 0-2 0-13 0-1
2 3-5 14 2-4
3 6-9 15-16 5-10
In other words, there is a variable (call it A) with a single value that corresponds to a range of values in the other variables (call them X, Y, and Z).My program needs to accept user text input of values of X, Y, Z, etc. and then match each to the corresponding value of A.Example: User enters 4 in the X text box; program determines that if X=4, A=2.Again, we're talking about tables and tables of data in this format. Unaware of a better method, I have been using arrays.
Example:
Dim a() as double = {1,1,1,2,2,2,3,3,3,3...}
Dim x() as double = {0,1,2,3,4,5,6,7,8,9,10...}
Note how I had to artificially deal with variable A so that the index of each score corresponds to the index of the matching X variable.It is this modification of the variables that is taking forever. There has to be a better way! Hypothetically, what I need is the ability to do something like this:
Dim a() as double = {1,2,3,4...}
dim x() as double = {0 to 2, 3 to 5, 6 to 9...}
Is there a way to represent a range of values at a single index of an array, such as my hypothetical example above? This would save me hours of re-shaping the data to make the arrays work.
I have a listview box. I load the listview up from a text file and everything is divided into three groups. I need to be able to select multiple lines then push that out to a single variable, separated by commas. Two things are happening that are problematic:
1) If I just have it set to smallicons and no checkboxes, anything I select is highlighted right up until the control loses focus at which point everything un-selects.
2) If I turn on checkboxes, I can click boxes and they stay selected when I lose focus BUT the checkboxes are cut off on the left side of the control. (The checkbox appears to go off the edge of the control.) There's plenty of space in the control for the checkbox and the listed items.
can we have a single global variable which can be manipulated by multiple forms
View 6 RepliesI'm trying to use the timer (not a Timer object) in a Do... Until loop. I want the loop to put a single variable into a label. When I do this it works and puts the value into the label (lblOxygenReading):
If btnGetOxygen.Text = "Get Oxygen Reading" Then
Select Case True
Case rdoColorWhite.Checked
strCurrentColor = "White"
Case rdoColorRed.Checked
[Code] .....
It goes through the Do loop and the For.. next loop but doesn't change the label. Visual Studio doesn't show any errors when I'm writing the code, but when I run it, it hangs somewhere.
In vb.net 2.0 is it possible to declare a variable globally so that it is visible to all projects of a single solution?
View 1 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 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
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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]....