.net :: Storing 4 Bits From A Byte?
Aug 19, 2010
What is the best way to store 4 bits from a byte in VB.Net? Where best means:Most straightforward method of storage from a Byte type.The easiest to work with while performing bitwise operations.Straightforward conversion of the bits to other types.Storing them in a BitArray via it's constructor reverses the order of the bits. This means that attempting to get the value of the first bit will require looking for that value in the last entry in the BitArray.
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Oct 2, 2010
given 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]
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Jan 27, 2012
I'm trying to check whether a Win(RAR) archive is password protected.
0x74 0x24 0x94
How can I convert 0x24 0x94 to bits and check whether the file is encrypted with a password?
HEAD_TYPE Header type: 0x74
1 byte
HEAD_FLAGS Bit flags:
[code]....
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Oct 4, 2011
value = CInt(&HB)
Dim b As New BitArray(BitConverter.GetBytes(value))
Dim sb As New System.Text.StringBuilder
[code]....
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Jul 5, 2011
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.
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Mar 14, 2011
I am a visual basic developer, I have windows 7 64 bits and Visual Studio 64 bits installed.CAN I DESIGN APPLICATIONS WITH THESE SETTINGS THAT CAN BE COMPATIBLE with 32 bits operating system(example in windows Xp 32 bits)?
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Feb 8, 2009
I have a simple byte array: Dim TheBuffer() As Byte={0,1,2,3} and I want to store it to a TEXT file. Is there any simple way of doing this? I want to enter the text file and see the array 0,1,2,3. don't want binary format etc.
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Apr 8, 2011
I'm trying to figure out how to calculate the lower 7 bits and 7-13 bits of two hex numbers.
Here is some example c code, just need this in vb.net:
serialBytes[2] = 0x64 & 0x7F; // Second byte holds the lower 7 bits of target.
serialBytes[3] = (0x64 >> 7) & 0x7F; // Third data byte holds the bits 7-13 of target
The 0x7F is a constant so the only number that changes based off input is the 0x64.
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Mar 28, 2012
how can I use SQLConfigDataSource to add DSN to the 32 bits ODBC on Windows 7 64 bits? I know it use C:WindowsSysWow64odbcad32.exe and on registry, HKLMSoftwareWow6432Node but the API do not allow me to configure it?how can I do ?
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May 9, 2010
An application created with Visual Basic in Win7 64 bits will it still work fine in both WinXP 32 bits and Win7 32 bits ?
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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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Apr 6, 2011
Objective: 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.
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Dec 18, 2010
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)
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Dec 8, 2009
I 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]....
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Jul 13, 2012
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]....
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May 16, 2011
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].....
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Sep 20, 2011
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?
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Mar 30, 2009
I 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'"
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Nov 18, 2010
How could you convert a IntPrt to a Byte Array (Byte()) ?
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Jan 25, 2011
I 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.
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May 6, 2007
I would like to know how to convert a unisgned byte to signed byte
Atm I got this
a
Function readSignedByte() As SByte
'-128/127
Dim b As SByte
[Code]....
it doesn't work one that well works for numbers positive over 127 if lets say ReadByte() has 128 it would give overflow error which I don't want it to give I would like it to overflow the number to negivate value aka its signed value.
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Mar 14, 2012
I am trying to write some code to get a kinect for windows sample running, which is originally written in C#. I get stuck with translating the following C# code to VB.NET:
byte intensity = (byte)(~(realDepth >> 4));
What is the VB.NET equivalent for the code above? how to translate the "~" code sign.
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Mar 16, 2010
TimeGetTime gives the runtime of the program (I think) in millisec. How big is the variable in bits? I meen it must overflow at somepoint. How often does this happen?
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Mar 7, 2010
I get an "invalid parameter" error back from wmi. just trying to download a file via BITS.
Try
Dim classInstance As New ManagementObject("rootMicrosoftBITS", "BitsClientJob", Nothing)
' Obtain [in] parameters for the method
[Code].....
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Nov 4, 2010
I have a 3rd party dll, and I can't have it referenced while compiling for 64 bit. Is there a way around this? I'm guessing it is because the dll is a 32 bit one, but I'm not sure about that.
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Apr 8, 2009
how i can get the first 16 bits of a 32 bit hex number.
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Jul 10, 2010
I am moving Visual Basic 2010 Express from a 32 bits Windosw 7 machine to a 64 bits Windows 7 machine. My project contains a PowerPacks line. I have installed the PowerPacks (VisualBasicPowerPacks3Setup.exe) on the 64 bits system, and see them in the toolbox. When I try to open the project on the 64 bits machine. however, I get error messages:The designer cannor process the code at line 56:
Me. ShapeContainer1 = New Microsoft.VisualBasic.PowerPacks.ShapeContainer
The referenced component 'Microsoft.VisualBasic.PowerPacks.Vs' could not be found
I then thought I would just remove the (purely cosmetic) line on the 32 bits machine, but cannot discover how to do this (I would have though: rihgt click, and then delete, but this doesn't exist)
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Oct 14, 2009
I have an app (developed using VB 2008 and MS Access 03)
It runs fine under Windows XP, Windows 2003 and Windows Vista 32 bits....Butit crash under Windows Vista 64 bits.
The app not register any error and exception (internally). [code]...
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Apr 13, 2011
I am soon to develop a Win Forms app that will run on traders' machines and the main concern is to have the app use as little memory as possible. Ever single line of code needs to be written with this in mind. What are areas I need to take into account? Of course you will say to do any complex processing on e.g. the database and not the client but what else?
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Apr 14, 2009
I have made a very small (only one form and no database operations) but nifty application and I want many people to be able to use it. My question is: As I only need a very small part of the dotnet framework, is there a way to let the compiler (or so) grab only the parts it needs for the .exe/.msi file, so that users don't have to install the entire 3.5 framework just to run my tiny little app?
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