how to have the code randomly pick a memory location in an Array without having it filled, perferably in VB.NET Thinking of the logic, I was thinking
Dim random As Random
Dim tic(2, 2) As String
random.Next(tic(2,2))
Would putting the array as a parameter would randomly pick a memory location in an array?
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The problem that I am having is that instead of displaying "hello" I want it to add the listbox items to the array.
Can you have it randomly pick a value from an array?
I'm doing a project at the moment for school,I need to randomly pick a number from an array,which I can do but I can only use that number three times,I dont want an answer
View 8 RepliesI need to randomly pick an element from an array and I can only use that element three times,I can randomly pick the element but how do I go about only using it three times.
View 4 RepliesI want to pick some uniq numbers from a list of numbers randomly list of numbers:
dim firstlist() = [1,2,3,6,7,9,12,16]
I want to pick some uniq numbers randomly from this list [2,6,16]
I'm working on creating a very simple dice game for class (not for gambling purposes). The users has already entered their total amount of money, and are are able to wager for every round. We were supplied with 6 different picture files to represent the 6 sides of the dice. It will be located in the C:\Temp folder, and after the user clicks a play button, the form (frmDice) will appear, which has two pictureboxes(pbDice1 & pbDice2) located on it.
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I am trying to copy a byte array into a Class that is in a third party library
Dim usr As New RSI_USER_RECORD Dim ba(RSI_USER_RECORD.RSI_LEN_USER_REC - 1) As Byte 'populate ba here usr = ba 'how can I do this? Is this even possible?
Here is the definition of the class (from Reflector)
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how I pick a random item from a array?Here's the little bit of code I got:
Dim array() As String
Dim words As String
words = "hello*123*abc*zxw"
array = Split(words, "*")
But what should I do next to randomly select a item from "array"?
I'm trying to configure my program to choose a random entry from an array:
Code:
MsgBox("Participants will now be allocated to each group at random...")
Dim number As Integer
Dim randomnumber As Integer
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I am making an application that randomly generates numbers. I then have to find out if those numbers are even or odd. Then place them in the corresponding array ( EvenNumbers() or OddNumbers() ). Then display the random numbers array then the even and odd numbers array. I am up to the point where I have the generated numbers and can tell if they are even or odd, but can't get them into an array. I am trying to do it like this....
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I have a form with one richtextbox and one button. The idea is that:
Form Load: data read from text file into arrayButton Click: random number generated, then used to select the string whose index number matches the random number generated
My StreamReader is working correctly and I can create random numbers with no problem, but I'm stuck on how I can use this random number to extract the corresponding string. I keep get the error saying QuoteObject reference not set to an instance of an object.
My code is below:
Imports System.IO
Public Class Form1
Dim questions(69) As String
Dim i As Integer
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I am writing a who wants to be a millionaire console application in VB and need to write the 50/50 bit. I have tried searching for a solution but i couldn't find anything that would solve my problem. The questions and answers are stored in an array and i need to be able to call a random answer from the array.
View 3 RepliesI have a question about an array of string and random. I have an arry of string i.e Dim testArrayString() As String = {"Orange", "Apple", "London", "Sydney", "anything"} I want to show the each element of the above array randomly one by one in a message box....and also stores that randomly generated string from that array into an another variable... How would i do that... i have no clue
View 5 RepliesI have 22 images and I am trying to add them into an array and then assign them randomly to a button so when the button is pressed it will change to the assigned image. Also is it possible to randomize the array.
View 4 RepliesI have 4 set of words store in array and wan randomly selects and scramble its letters in a label. i just know how to do the coding part of randomly display the words in the label but it no scramble i have no idea to do the scramble part, any expert can give the solution or example?
Below is my code:
Dim word(4) As String
Dim random As New Random
word(0) = "superman"
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randomly select a single student out of the student array based on their subscript number. This will be accomplished by the following:
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unfortunately I cannot resort to C# in my current project, so I'll have to solve this without the unsafe keyword.I've got a bitmap, and I need to access the pixels and channel values directly. I'd like to go beyond Marshal.ReadByte() and Marshal.WriteByte() (and definitely beyond GetPixel and SetPixel).Is there a way to put all the pixel data of the bitmap into a Byte array that works on both 32 and 64 bit systems? I want the exact same layout as the original bitmap, so the padding for each row (if it exists) also needs to be included.Marshal doesn't seem to have something akin to:
byte[] ReadBytes(IntPtr start, int offset, int count)
Unless I totally missed it..
Module Dic_Select
Public DicDataSelect() As DicDataList
Public Selected_Dictionary_Name As New ArrayList
Public Function New_Dictionary(ByVal Dic_Name As String) As Boolean
For i As Integer = 0 To Selected_Dictionary_Name.Count - 1 Step +1
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I'm newb in the .NET framework so how could I go about loading an array of images into memory?[code]...
View 4 RepliesI need to improve memory performance on my application and I could see that I have problems with memory fragmentation.I've read an interesting article on large objects from Andrew Hunter of Red Gate, and one of the solutions he recommends isow do I implement his suggestion in my code?My program has a very complex form (with an object that leaves residual memory every time it opens. I found a complex list that may be the culprit, and I'd like to implement his suggestion to see if it fixes the issue.
View 1 Repliesjust wanna get that simple problem.,but i am confused bout this i cant get the index location of an array>
my problem is have to display 5 elements so the index is 0 to 4 right?
example i entered 1 2 3 4 5 then i searched 3 the location should be index 2?right?
how can i get the index location of the searched number?if you can make me understand sub and functions too..
I want to get the array location first charector or example i declare the following array
View 2 Replieshow to convert byte array to memory stream in vb.net.
View 1 RepliesI am using IonicZip to compress video files and store in a blob field. I have the zip file created just need to convert it to a byte array. How is this done without writing to the harddrive?
View 1 RepliesI have a structure in VB.NET that has a dynamic array of double as a parameter. I am passing an array of structure (GElement) to a C++ DLL. I tried converting my array of GElement into a block of unmanaged memory, it works in VB.NET but crashes in my C++ DLL. I get the same error just trying to simply pass an array of GElement to my DLL instead of a Intptr.
Here is the error
0xC0000005: Access violation reading location 0x00000004
Here is my function and structure in the DLL:
void _stdcall TestGElement(GElement* ge,long& nbge){
nbge=5;
} struct GElement {
double Step2D;
double Step3D ;
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I know it is easier if the array inside the structure as an already defined constant size but that can't be the case here...
How to convert memorystream byte array to csv file. I have GetExport method that converts rpt file to excelformatted memorystream and then returns that as a byte array. Is there a way to convert this byte array to a csv file? Due to some reasons I can only pass this byte array back to calling function.
Public Function GetExport(ByVal reportID As ReportID) As Byte()
Dim byteArray As Byte() = Nothing
Using expRptDoc As ReportDocument = New ReportDocument()
Dim rptFileName As String = Server.MapPath(ReportCommand.GetXMLReportPath(reportID))
expRptDoc.Load(rptFileName)
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I am trying to import a text file into a data table using VB.NET. I need to loop thru each line of the text file and put certain elements of that line in a new row of the data table. The line may contain 50 elements, but I only need to get 15 of them. The very first line is a header row, which contains "File Name", "Object Name", "Object Weight", etc. The trick is the element locations move from file to file. For example, "File Name" element may be located at 0 in one file and then 15 in the next file. I need to find the exact location of my desired elements and save them to a variable. Then use that variable to locate the exact piece of data in the text file line to place in my new row.
The code below obviously doesn't work, but it kind of illustrates what I need to have done.
Try
With dt
.Columns.Add("fltObjectWeight", Type.GetType("System.Double"))
.Columns.Add("vchObjectName", Type.GetType("System.String"))
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Once i allocate arrays is the memory allocated for them immediatlyy or once i add data to the array? like say i create an integer with 400 million arrays (lol) would visual basic allocate memory immediately for each of the 400 million arrays or once there is data allocated to one of the 400 million arrays, say when i put the number 4 in the 100th array.
View 1 RepliesI have a reportviewer that I am rendering as a pdf into an in memory byte array. What I need to do is apply an owner and user password for the pdf. I have downloaded the adobe sdk and have scoured the Internet for examples to do this to no avail. with a VB.NET example that will apply the owner and user password for the pdf.
View 2 RepliesI'm trying to get a string from a byte array previously read from memory
i can get the string like this
dim mem as string= ASCIIEncoding.ASCII.GetString(memory) or dim mem as string= UTF8Encoding.UTF8.GetString(memory) but when i try to concatenate this with another string i get a strange result dim result as string = "this is you memory string " & mem & " problem string" no matter what comes after mem in the concatenation it seems like it is not there when in fact it is because when i try this (mem has two chars in it) dim result as string = "this is you memory string " & mem(0) & mem(1) & " problem string" problem string appears so what i assume is that there are some vbCrLf chars in the string after reading (or is it from the conversion?)