BitArray.Copyto A 1-demensional Array?
Aug 6, 2009
I have created a BitArray which is 11 bits long.I want to convert the BitArray so I can save the bits to a SQL server database field as a binary [varbinary(50)] so I can retrieve it at a later date and convert it back to a BitArray.Using examples on MSDN I have cobbled together the code I think I need.
Dim myBits As New BitArray(11)
I have populated the bitarray with 11111111111 for the purpose of testing ' Creates and initializes the one-dimensional target Array of type integer.
Dim myByteArray As Array = Array.CreateInstance(GetType(Byte), 11)
Note: from the above MSDN description this is an array of type integer - is this correct? I think it is a type 'byte' ?
' Copies the entire source BitArray to the target BitArray, starting at index 0.
myBits.CopyTo(myByteArray, 0)
I wanted to print the contents of myByteArray to a console to see what was going on. MSDN provided these print methods
Public Overloads Shared Sub PrintValues(ByVal myArr() As Array)
Dim i As Object
For Each i In myArr
Console.Write(ControlChars.Tab +
"{0}", i)[code].....
trouble is, I am getting the following error which suggest I havent succesfully created the byte array:
Error 2 Overload resolution failed because no accessible 'PrintValues' can be called without a narrowing conversion:
'Public Shared Overloads Sub PrintValues(myArr() As Integer)': Argument matching parameter 'myArr' narrows from 'System.Array' to '1-dimensional array of Integer'.[code].....
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Feb 28, 2012
I'm trying to get my chart (y values) updated on the run, they need to be updated by an integer.
Dim a As Integer
Dim b As Integer
'some button.click code, contains a += 1 and b += 1
Chart1.Series("Series1").Points(0).YValues = a
Chart1.Series("Series1").Points(1).YValues = b
But it says Value of type 'Integer' cannot be converted to '1-dimensional array of Double'.
so, what do I have to do to fix this?
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Mar 12, 2010
I have a function to create a pdf which should return bitarray. Below is the code
Public Function GenPDF() As BitArray
Dim pdfdoc1 As BitArray
Dim doc As New Document(iTextSharp.text.PageSize.LETTER, 10, 10, 42, 35)
[code]....
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Jul 13, 2010
I am trying to the copy the value from string to char array using String.CopyTo() method.
Here's my code
Dim strString As String = "Hello World!"
Dim strCopy(12) As Char
strString.CopyTo(0, strCopy, 0, 12)
[code]....
Edit : I get the this error at runtime.ArgumentOutOfRangeException Index and count must refer to a location within the string. Parameter name: sourceIndex
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May 14, 2010
I am trying to create a array that holds a series of arrays.A holds X amount of array.so I thought I could declare dim A(howmanyIwant)(3) as String however that does not seem to work.How many arrays A has to hold depends on a parameter.So how is it really done?In the end I would like the result:
A(0)(0) = 1
A(0)(1) = 2
A(0)(2) = 3
A(1)(0) = 1
A(1)(1) = 2
A(1)(2) = 3
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Sep 10, 2010
<div style="color: rgb(0, 0, 0); font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; margin-top: 8px; margin-right: 8px; margin-bottom: 8px; margin-left: 8px; background-image: initial; background-attachment: initial; background-origin:
[code].....
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Sep 14, 2011
I'm trying to pass 2 bitarrays to a function that ANDs the bitarrays and returns the count of bits that are set to TRUE. However, something strange happens when I reference the bitarray from within the function and the results are non-sensical.
So I have output the bitarray contents before it is passed to the functionand they match the source data, then I output the contects of the bitarray from within the functiona and they are completely different.
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May 23, 2012
VB Code:
Dim fi As New FileInfo(PicPath)
Dim di As DirectoryInfo = Directory.CreateDirectory(Path)
Dim FileNameRandThumb As String = POath & ThumbFileName
[Code]....
This Code results in copying the Image correctly but the original image is now 0kb
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Nov 11, 2009
I'm populating a Repeater with a PagedDataSource and after I populate that Repeater, I want to perform some other operations on the subset of data that makes up the page I'm sending to the Repeater (my CurrentPage Index, PageSize=10). So my question is how to get at those 10 records?
From reviewing MSDN, it looks like I should be able to use PagedDataSource.CopyTo to copy that to a System.Array, but I seem to be getting "Index was outside the bounds of the array." (I'm not sure how I need to be setting the bounds of the array from the PagedDataSource.)
Alternatively, I'd be happy if I could get those records into a SqlDataReader or any other way to read them and do more with them other than just displaying in my Repeater (again, looking for the records from that page that I set as the DataSource on my Repeater) Or, am I going about this the wrong way and is there a way to pull these back out of the Repeater?
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Jun 9, 2009
In C# and Vb.net,is any way without iterating by loop a bitarray to check contins any true or false value (Dotnet 2.0) ?
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Apr 18, 2011
I need to include in my application that can receive connections from a client( or two).I am thinking, that I would like to have the clients send a "TelegramID" so that I may now how to process the code.Following the "TelegramID" would be a structure that would need to be processed.So far, I can use a single client and send just plain text but need some direction for my end goals.
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Nov 5, 2010
I recently discovered that the standard System.Boolean value is actually 32 bits - this seems pretty "far out there" since it's only ever going to be 1 or 0 - I found this information in somebody's blog which contained 3rd-party documentation on the System.Collections.BitArray. According to this blog, the individual Boolean is 32 bits while the individual index entry in a BitArray is actually just 1 bit - official documentation here at
MSDN indicates that in reality, the BitArray is just an array of Boolean Values (which would be the same size as any other boolean) that provides methods and functions useful in deconstructing System.Byte values into the BitArray and reconstructing the BitArray back into a System.Byte (same with System.Byte()).
I'd rather not go through a lot of code to restructure Boolean Arrays into BitArrays unless there's going to be some genuine memory-use improvement (which I'd expect to see if I converted large Boolean arrays - at 32 bits per index - into large BitArrays at 1 bit per index). I'm also interested to know if the Boolean is actually a 32 bit monstrosity.
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Jun 19, 2011
I have an array of people stored in a custom structure array... how can i copy this array to a temp array so that the temp array has all the same values as the original custom array?
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Jul 28, 2010
I am trying to create the following program Store in a 1d array a set of 5 place names and in a 2d array the distances between the places. Ensure that the order of the places is the same in both arrays. When the names are places are input the distance between them is displayed. If they are not both in the table a suitable message is displayed
Dim town(1 To 5) As String
Dim Dist(1 To 5, 1 To 5) As Integer
Dim First As Integer
[CODE]......................
I think the best way forward is pass a parameter to the function findnumber.
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Jun 1, 2009
I've come up with the following and it's partly working.
Public serial1, serial2, serial3, serial4, serial5 As SerialPort
Public serialports() As Object = New Object() {serial1, serial2, serial3, serial4, serial5}
dComPort = "COM4"[code]....
The above code works fine! But im having trouble trying to now retreive whats stored in the array.In the above example, an entry will be stored in serialports(4), all other array elements will be blank.If I do this it works.
MsgBox(serialports(4).PortName) ' this retuns the value COM4
But I'd like to loop though all array elements and print out ALL the PortNames, The below code doesnt work, I get an error Object variable or With block variable not set.
For i = 0 To serialports.Length - 1
MsgBox(serialports(i).portname)
Next
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Jun 19, 2009
I'm trying to sort an array based on a structure but whenever I do this, it basically erases all the data in the entire array.I have verified that the array is populated correctly, it is when using array.sort that everything returns blank.
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Nov 10, 2009
initialize an indefinite (eg. Decimal) array without setting boundaries on the array length?
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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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Dec 12, 2010
Per this UserControl that can be added to a blank form, I would like to use the HorizUnits array below to map custom grid x coordinate from a mouse x position.For a given input value 13, what syntax would I use to obtain a value of 2 where 13 lies between Value 10 and 16 for which 2 (Name) would be the custom grid's displayed coordinate position?
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Mar 12, 2012
I have a 2d array of data that I have performed the sum of the individual column of the 2d array. I want to send the results to a datagridview and also will like to have the result as a 1d or 2d array.
Below is sample of my code
Dim Array1(,) as double
Array1(0, 0) = 5
Array1(0, 1) = 7
[code].....
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Nov 27, 2009
Can I save an array into my .bin file then read the array again just like a string or Integer??
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Sep 9, 2010
I want to reading in a excel file and extract the sCodenumber sDescription ans the sStatus and store them in a array : StatusComposeArray(5200) As MyCompose. After this I need this array for comparing outside this class. But as can you see the array is defined inside the sub: ReadingIn_ExcelFilesCompose [Code]
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Jun 23, 2011
n my project i am to enter a name and a test mark into two separate text boxes and then select the button to store the information into the arrays, one array for names and another for marks, but when it is reset using the Erase <Array> fuction andi try to re enter information, no matter what information is entered i get a "Null Reference Exception Unhandled" Error.I am using Visual Basic 2008.My code is as it says from now:
Public Class frmAdverageTestMarkCalculator
Dim ClosingMsg As String
Dim Closingtitle As String
[code].....
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Dec 7, 2010
I am writing a pizza order program for class and have gotten everything put together, even got my array setup and displaying but when i go to calculate it will not calculate the values coming from the array in any of the calculations.
[highlight="vb"]Option Strict On Public Class Form1 'declare structure and module-level variables Structure PizzaSale Dim SizaString As String Dim StyleString As Stri]
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Apr 13, 2012
I'm using the following code to read in a highscores file with the score written first and the player's name written to the next line, and then display the top 3 scores or fewer if there aren't 3 scores written to the file. A highscores display should have the scores sorted with the highest first so that's what this program tries to implement.
Array.sort() isn't doing a damn thing. In fact, the program's not even reversing the arrays like it should either. I've tested array.sort() this way with the names and scores arrays given explicitly and it works fine. I thought maybe it was still reading the data as string even though it's declared otherwise but it rounds off decimals when I change the array type to Integer so I'm pretty sure it's not that.
I have no idea why reading the data in from a file changes how it's sorted. My teacher didn't understand what was going on either. Does anyone know what's going on here?
Imports System.IO
Public Class Form2
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code].....
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Apr 19, 2011
Can this be rewritten any better using LINQ? I'm a C#er trying to think in VB.NET for this current project. It's in an ASP.NET Web Forms .vb codebehind:
Public ReadOnly Property AllowedCategoryIds As Integer()
Get
Dim ids = New List(Of Integer)
[Code]....
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Apr 9, 2010
I want to compare two array and save the miss match character into 3rd array.
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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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Mar 20, 2011
I have a Comma Separated value file in .txt format... simply put, its a bunch of data delimited by commas and text qualifier is separated with ""For example:
"So and so","1234","Blah Blah", "Foo","Bar","","","",""
"foofoo","barbar","etc.."
Where ever there is a carriage return it signifies a new row and every comma separates a new column from another.My next step is to go into VB.net and create an array using these values and having the commas serve as the delimeter and somehow making the array into a table where the text files' format matches the array After that array has been created, I need to select only certain parts of that array and store the value into a variable for later use.... how to make the array and selecting the certain info out of it..
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Nov 23, 2010
Assume I have an array myArray1 = { A, B, C, D, E, F, ., T}I have another that contains a subset of the elements of myArray1 but where the order may vary
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