Writing An Array Of Single-precision Floats In One Operation
Sep 19, 2009
I am making the belated transition from VB6 to VB.NET (2008). I would appreciate some guidance on writing arrays to a file. I need to save and load large arrays of 4-byte floats (24 x 90,000 values is not uncommon). I can load or save them using nested for-next loops, but that's quite slow. I'd like to find a single operation that can read or write the binary data.In VB6 I could accomplish this (writing case shown) with Put #1 , , MyArray()I can read and write single variables from binary files without problems in .net. For example, [code]I have looked and looked, and Googled endlessly, but cannot find out how to accomplish a single-line numeric, floating-point array read or write in VB.NET.
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Aug 12, 2009
Private Function SingleToIEEE754Hex(ByVal pValue As Single) As String
[Code]...
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Aug 20, 2011
I have a BIN file which I need to write a single byte to at the end and maintain the previous data. Here is an example.Viewed with a hex editor the file may have F0 FD 48 D3 C0 as the data. I want to be able to add to the end of it FF so that when I view it with the hex editor it is displayed as F0 FD 48 D3 C0 FF. I know how to open files for putting data but how can I take those characters and write them to the end of a file. I tried using the put function ( Put #FileNo, , MyStr) where MyStr = the characters in the textbox but it doesn't seem to work. Here is some code.
[Code]...
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Oct 27, 2011
We are using vb.net to write tiff images. After the image is first scanned into the system, we read it into bitmap memory, then we write it back out as a tif and pass in arguments that tell it what to put in the header. When we look at the original file, the header shows the "Subfile type" as "single page of multi-page image". But we noticed that after the file is written, the header now shows the "subfile type" as "Full-resolution image". We do not currently pass any argument in that tells it to do that.Is there a way to pass an argument into the function that writes the tiff file to tell it we want a single-page tiff and NOT a full resolution image? For some reason, our customer's tiff reader is not accurately reading some of these files and we believe it might be the cause of this.
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Jan 19, 2010
Dim x As Integer = 1.8 1
Error:
Option Strict On disallows implicit
conversions from 'Double' to 'Long'
What Long??
EDIT:
Apparently Visual Basic attempts to convert any floating-point numeric expression to Long. OK, this part is clear.
Now, I can use the
CType((Math.Round(myResultingSingle)), Integer)
but what for MSDN tells that operator supports all the types if in reality it supports only Long as expression1 ?!...
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Sep 22, 2011
I've got my self in to a pickle here.I'm trying to do something I used to do in basic? At-least I think you can do this in Basic, you know Qbasic,What I'm trying to do is put 4-8 strings on to one line separated by a comma.Example might be:
writer.writeline (bob1, bob2, bob3, bob4) Out put might look like Test, Test2, Test3, Test4
I'm tried looking in to formatting of writeline/write, but I didn't get any where with it.
Also if this is possible- I would like to be able to read it just like :
reader.readline (Rbob1, Rbob2, Rbob3, Rbob4) If anyone cold just point me in the right direction, I'm sure I can figure it out - If not... Well I will ask another question.
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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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Jan 3, 2010
I've been researching all over Google for how to Read/Write Floats, Doubles, Longs and String to memory. I believe I have the reading Longs, and Floats working properly. I'll post my Module (which contains all my Read/Writting).[code]
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Nov 14, 2009
I am getting this exception: Cross-thread operation not valid: Control 'TextBoxOutput' accessed from a thread other than the thread it was created on. in a VB 2008 Windows Forms application that I havent specifically made multi-threaded. I have create a sub called Out() like this:
Private Sub Out(ByVal inString As String)
Me.TextBoxOutput.Text += (Me.TextBoxOutput.Text & inString & vbNewLine)
Me.TextBoxOutput.SelectionStart = Me.TextBoxOutput.Text.Length
Me.TextBoxOutput.ScrollToCaret()
End Sub
and I call it from various events to log messages I am getting from my pbx, which I use a third party open source dll to access. The interesting thing to me is that if I run the deployed application (ie, not in the VS IDE) I do not get any exceptions, it's only from within the IDE.if I add the line: Control.CheckForIllegalCrossThreadCalls = False to the form's constructor, the exceptions stop, but a) this seems like a hacky way to get around the issue and b) the application seems to hang sometimes when I have it set this way.
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Apr 27, 2012
I want to know the behavior of string array when using For Each loop in it. Consider following code:
Dim StringArray(499) As String'fill in each element with random string
Dim count As Int32 Dim current As String For Each current in StringArray
[Code]...
As shown in the code above, if I need to access StringArray twice using For Each loop, is that true that ALL elements in StringArray will be loaded twice even though I only use 10 elements in each For Each loop? From performance point of view, is that advisable to use String array as data structure to store a list of strings that needed to be accessed multiple times, for example 20 times within a method?
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Jun 20, 2011
I have a problem: When try to change the text of a label array (label(1).text = "Lol") then I get a error:
"Cross-thread operation not valid: Control 'lblCSCH1' accessed from a thread other than the thread it was created on."
The code is this:
Private Sub Cliente_Receive(ByRef message As String) Handles Cliente.Receive
Dim anterior As String
Dim corte As Integer
[Code]....
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Nov 14, 2011
How to initialize a multidimensional array by loop operation in VB .Net?
I have some arrays called 'Room', 'Subject', and 'Population'.[code]....
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Jul 5, 2011
what is the different writing code application vbnet 2005 application for single user and multiuser?
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Sep 7, 2009
It would be easy enough to make my own system for this, but I'm figuring that the .NET library, being as massive as it is, probably already has a class made for this very purpose.For hit detection, my VB.NET game uses two 2D arrays that store the state of each pixel in the level. Each element in these arrays is a Byte (or, more accurately, a value of a flag enumeration type based on Byte).
Public TiHD(,) As HitDT ''//State of each pixel in the level based on
''// its underlying tile.
Public SpHD(,) As HitDT ''//State of each pixel in the level based on[code].....
I would enjoy being able to just give each sprite & tile its own 2D array of hit detection data (defining which pixels of the object are solid, dangerous, etc) that can be directly written to TiHD or SpHD at a specified offset.I'm willing to bet that .NET has a class that can do this for me.Presumably I would just have to pass TiHD or SpHD to the constructor, and then I would be able to use the object to indirectly modify the array with extended functionality (similar to using a Graphics object to modify a Bitmap). Is there such a class?
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Oct 24, 2009
I have an array that varries in number of values, depending on the information . I am trying to write the array values in a line in this format:Clients ("John,"Samantha","Joe")in this example I used Three values in the array, but in some senarios there might be more or less number of values.what would the best way to write this line in between brackets as I mentioned in the Eample.
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Jul 6, 2010
I have a structure in memory which is working fine - now I need to write this entire structure to a file. The below code almost compiles, the problem is that "mstaRecordInfo" cannot be changed to a string, probably because of the Date field. I've just spent over an hour experimenting and searching the web but have gotten no closer to a solution.
[Code]...
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Jun 9, 2010
Situation: I have a .csv file containing numerical values. I'd like to read the file and write the values to a 2-D array of the same form. Problem: I get all the rows of the .csv file written to a 1-D array. Looking at the code, I thinking I have the indexing for column and row positions incrementing properly but (besides experience in C#) I don't know what I'm missing. Below is the code accomplishing this.
[Code]...
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Aug 3, 2010
I would like to add items to a new line of a message box from an array. I gave it a try and should have known it wouldn't work
Dim messageString As String
If (count = 0) = False Then
i = -1
[Code].....
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Sep 1, 2011
I have a site that dynamically creates two arrays of Lat/Long values based on the stores that the currently logged in user can see. If the user can only see one location then I get an error about array length needing to be a finite integer. When I look at the source I see var ls = new Array(45.056124);is being created on the page dynamically which is what I'm expecting. Except I think it is treating it as if I am trying to set the length of the array instead of set the first element to that value.How do I go about creating an array using the ClientScript.RegisterArray Declarationfunction to hold a single double value using vb.net?
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Feb 20, 2010
I have a site that dynamically creates two arrays of Lat/Long values based on the stores that the currently logged in user can see. If the user can only see one location then I get an error about array length needing to be a finite integer. When I look at the source I see
var ls = new Array(45.056124);
is being created on the page dynamically which is what I'm expecting. Except I think it is treating it as if I am trying to set the length of the array instead of set the first element to that value.How do I go about creating an array using the ClientScript.RegisterArrayDeclaration function to hold a single double value using vb.net?
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Jan 4, 2012
i am having an array of int like this [1,2,3,4,4,3,2,1] now how to split this single array in to two on both directions
like this [1,2,3,4] and [4,3,2,1]
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Feb 9, 2010
I am trying to write a program that will use a Structure with <VBFixedString(4), VBFixedArray(10)> Public Test1() As String. Back in vb6 it was in the Type statement as Test1(10) as string *4 When I hit the line ".Test1(X) = TB1" i get the following error:
Object reference not set to an instance of an object.
[Code]...
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Jun 23, 2012
I am writing an application that has a user enter a wage per hour plus an anticipated salary increase percent and calculates the the users salary for the next 10 years. I have received some help from a few folks who are beginners like myself with visual basic and we are at a road block.
Public Class Form1
[code]...
Error1Expression is not an array or a method, and cannot have an argument list
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May 15, 2012
I�m currently working on a school project and I have encountered a problem in my code. When i write the contents of my listbox to a file called stock.txt it seems write an invisible linebreak in-between each data entry, my problem is that when I load my array on the next form those invisible linebreaks causes my array to load the data incorrectly.
I have attached a pic of my stock.txt file
The Code that Edits and writes to stock.txt
Private Sub BtnRemove_Click(sender As System.Object, e As System.EventArgs) Handles BtnRemove.Click
'Removes the selected item from the listbox then updates stock.txt
lbxStock.Items.Remove(lbxStock.Text)[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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Sep 7, 2010
I've managed to make some single dimension array lists but I can't figure out a multi dimension arraylist.
Here's what I'm trying to do:
I have a database (mdb) with 5 columns that I want each row to be in an array list.
In PHP what I'd typically do is:
$array[$field1] = array($field2,$field3,$field4,$field5);
How I do the same in vb.net so anytime I need to fetch an item for a specific for the row1 I could call it?
For a single dimension I could do the following, but I can't figure out how to add more fields to a single array row:
Dim tmpArrayX As New ArrayList
tmpArrayX.Add(field(0))
tmpArrayX.Add(field(1))
etc...
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Nov 3, 2009
ow would I go about turning the number from an array into a single stringsay for example I had:
Dim MyArray(4) as Integer
MyArray(0) = 1
MyArray(1) = 2
[code].....
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Mar 11, 2012
I'm doing a project for my beginners programming,logic, and design class. The project is a Sales Solution/Bonus Calculator. I really just want to know if I actually coded the array correctly. I've found the same project on here but I wasn't even really sure if what they had up was correct. I have a pretty solid idea of how to get through this I'm just feeling a bit overwhelmed. If you notice any other errors please point them out. I'm not looking for the answer I'm just looking for the path to get there on my own merit. Here's what I have so far:
Public Class Form1
Private Sub Report_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CreateReport.Click
[code]......
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Aug 3, 2011
I have a fairly small double and a fairly large double. When I divide the large one by the small one and display it with Console.WriteLine, it always shows exponential notation. Can I display the non exponential notation form?
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Aug 13, 2010
Now it seems like a really simple question and I may just be being thick, but what I'm trying to achieve is basically print an array to screen in the following format: Item 1, Item 2, Item 3, Item 4 Although I say to screen, as that was the best way I could describe it, I'm actually writing it to the page inside some Javascript. The way I'm currently going about writing it out is as follows:
[Code]...
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