Getting And Setting Single Bits In A Byte-array Using .net?
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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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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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 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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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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Mar 27, 2010
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.
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Mar 24, 2010
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?
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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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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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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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Feb 26, 2012
I 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]......
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Sep 20, 2009
How do I read a raw byte array from any file, and write that byte array back into a new file?
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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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Jun 20, 2011
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]...
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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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Nov 7, 2010
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
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Feb 7, 2010
I 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
[code].....
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Feb 1, 2010
I think the way to do this in VBnet involves binary math? -- no "easy" way I don't think (like picbasic mybyte.0 = 1 mybyte.1 = 0 etc).I know you can read a bit by using convert.toint32 (2^0) (2^1) etc. and comparing to an integer value but my head is going in circles on how to set (write) a bit value. I need bytes because I intend on writing to the serial port.If bit0 is 1 then mybyte bit 0 = 1.
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Jul 14, 2009
I am looking to convert an integer into a boolean array where each item in the array corresponds to a bit in the binary representation of the integer.
MyInteger = 3 '011 in binary
to
MyArray(2) = False
MyArray(1) = True
MyArray(0) = True
Also is there anyway to assign a value to an Integer in binary or hex (like MyInteger = 1010b or MyInteger = A7h)?
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Aug 4, 2010
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.
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Feb 26, 2012
i would like to convert a single byte to a string.
dim mybyte as byte = &h11
dim mystring as string
i tried
[code].....
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Dec 4, 2009
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.
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Jun 14, 2011
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]..
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Jun 22, 2010
A c# class's single dimension byte array contains socket level instrument sensor data as per:
public static byte[] frameData
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Jun 2, 2010
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?
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