I've been learning how to implement genetic algorithms in vb, and some sample I downloaded basically does the following in a few places:
[Code]...
I gather that this process could be used to define the size of an array that is not known at creation, but becomes known later in the program. VB2010, however, doesn't like this code at all, and tells me ReDim can no longer be used to this end. Why? And is there an easy replacement for this?
[edit]Sorry I left a bad title in this thread - confusing![/edit] Been a long time since I used an array - they are so limiting...But I need to build a simple string array - that I'm passing to a C/C++ function.
Is there any other way to do this other than keep REDIM PRESERVING??
[Code]...
As you will see from the code below I need to be able to tell before the array runs how many members of the array there are or else the program will crash. How can I redim the array depending on how many lines are in the text file (RECORDS.txt)
Imports System.IO
Public Class Form1
Structure Nation
Dim name As String
Dim continent As String
[Code] .....
As you will see from the code below I need to be able to tell before the arrayruns how many members of the array there are or else the program will crash. How can I redim the array depending on how many lines are in the text file (RECORDS.txt
Imports System.IO
Public Class Form1
Structure Nation
[code]......
I need to generate a GUID so I can store into a table and the create related records (to be filled in later) in 3 other tables. Used to be easy in VB6 with the CoCreateGuid() function. But I'm not seeing anything in VB.Net help files to match. Trying to use this function I get all kinds of COM errors. So I guess I can import several COM/DCOM classes to make it work, but maybe the overhead isn't worth it.
View 3 RepliesI have 9 tables with state information in them. They all have the same field names. I have a Crystal Report that is based on one of them. I want the user to be able to select a state and change the Crystal Report to use that table instead of the one it was based on.I mean when user select text in combo box and then click on "OK" then report show (using only one rpt for all the tables of same fields).
View 2 Replies'm reading in a .txt file and then writing it back out. I had a user request to substitute some values that need to change.EA to PRFT to EAI know how I would do that in SQL, but I do not know how to change the values of the information inside of a WriteFileStream
View 5 Replieswhat is the substitute for ADDNEW function in VB5 at the newest VS2008 their there was just recordset to which u apply this function then allwing u to add a record to a data base?
View 2 Replieswhat is the substitute of PictureBox.hWnd of vb 6.0 in vb.net 2005 if any know then reply me soon.
View 1 RepliesI am working on the mobile device application and I have a simple form where I have a text box+submit buttom and datagrid
On value enter in textbox+submit, i want to display the the data related to that value (txtbox) in grid.
Now in the compact framework there is no option like Selected value There is selected all, selected text. With the use seleted text is not working.
Dim con3 As New SqlConnection("xxx")
con3.Open()
Dim cmd3 As New SqlCommand
[Code].....
I have a combo with 6 text NA,PO,FA,GO,VG,EX and I want to do a Linq query upon the selected value in this combo used as field in the where clause. for example:
'if "NA" is selected :
Dim query = from t in db.table where t.NA > 0 Select t
'If "PO" is selected :
Dim query = from t in db.table where t.PO > 0 select t
How to do this in elegant way without writing 6 if statement or using "Select case"
I have a VB form that contains controls for interfacing with some hardware (video cameras, motors, etc) on the machine it is to be deployed on, but I'm usually not at the location of said machine (it's a 3-hour drive away). I'm trying to work on the project while on my laptop, but obviously the controls will generate all sorts of errors since they can't talk to the hardware.
I was thinking of replacing the control types with my own mock control classes, then use #if directives to control whether I'm building for the real machine or my test machine. Problem is, some of the affected code is in the form designer-generated code section; the form designer automatically tries to "correct" my changes, so I'd have to manually put them back all the time, and try to remember not to commit the form designer's edits into version control.
I have an array that is something like; Product (x,y)
When i try to do;Redim preserve product (a,b)
It gives the error that i can change only the dimension of the right place, but not the left one.
How can redim a 2 dimension array?
This is my structure...
<Serializable()> _
Public Class AcctRecords
Public Amount() As Long
Public DateC() As String
[Code] .....
This is where I try to create a new instance but I get an error that states:
Overload Resolution Failed Because No Accessible "NEW" accepts this number of ArgumentsPrivate Sub FixMasterArraySize(ByVal Cnt As Integer)
ReDim Preserve Acct.Master(Cnt)
For I As Integer = 0 To Acct.Master.Length - 1
Acct.Master(I).AcctType =
New String
Next
End Sub
If Acct.Master(I).AcctType was a Boolean type there would be no error..
I am using Visual Studio .Net 2008. I am using "Structure" statement for my work. It is working with me perfectly. I am not sure if Understand the structure statement very well because it does give me wrong answer if I change the position of "Redim" of the structure elements. My problem is the structure is using "Redim" in many places which is a dangerous procedure. I do not know how exactly to explain my problem because the structure in my code is used widely and called in many subroutines. I will try to explain with the below simple code:
[code]...
My question is: How can I move the all "Redim" statements outside the loop so that the Redim happens only ones? What does "TheCollection(Iteration + NumberOfMembers).TheResult" does take? Is it zero or what?I searched the web but I could not find a proper website or article which explains the structure. The only useful link I found is this:[url]
In a case where you would like to reset an array of boolean values what is faster, rediming the array or enumerating and resetting the values? I have run some tests and they seem to suggest that a redim is a lot faster but I am not convinced that it isnt a result of how I'm running the tests.
My tests seem to suggest that redim is nearly twice as fast.So could anyone care to comment on which is faster and why? Also would you expect the same result across different languages?
[Code]...
I have a public string() array defined, and each time a timer_tick event gets triggered, I loop through the array and visit web pages contained in the array.
for i = 0 to UrlList.Count - 1
' Do stuff
WebBrowser.Navigate(urllist(i))
While WeBbrowser.ReadyState <> WebBrowserReadyState.Complete
Application.DoEvents()
end while
next
redim urllist(0) ' I have tried w/ & w/out preserve
urllist = nothing
array.resize(urllist,0)
I just want an empty array w/ node count of zero. (Essentially eliminating the entire array) I have another process that fills the array.
I have the following array in my project that I'm trying to redim without losing the values.The problem with redim preserve is I can only redim the last dimension of the array. I want to redim the 2nd dimension without losing data. How do I get this to work?[code]
View 11 RepliesI have an array declared:
[Code]...
This statement works fine in ASP, but when I switch to ASP.Net, it give errors 'ReDim' cannot change the number of dimensions of an array.
I can't fix following code:
Private Sub Dic_List(ByRef sender As Array)
Dim L_sender As Integer
L_sender = sender.Length / 5 - 1
ReDim Preserve sender(4, L_sender + 200)
End Sub
Error 1 'Redim' statement requires an array.
But sender is an array.
I have an object array that I want to reference. The object array is in a deep set of classes so it takes class1.class2.class3.class4 just to get to it. I need to use this many times throughout my code so I figured I'd just create an object i.e. Dim Obj as Object and reference this array:
Dim Obj as Object = Class1.Class2.Class3.Class4.ObjectsArray
Problem is I can't resize the referenced array, by using the reference. The following does not work:
Redim Obj(5)
How come it isn't referencing my object array completely? is it because its the same object type?
with a function to redim preserve a multidimensional array (2d) and change both dimensions, also it would be a
View 3 RepliesIm coming from a background of writing vba in excel, but have go to the point where im fed up of having everything running in excel and have started leaning vb.net. i am trying to do something i have done before, but am pretty much rewriting it as having got the end i now see a better way of doing things
Normally Google is full of help full answers but today it isn't, i may be i'm doing something odd or am trying to use completely the wrong tool for the job am happy to be told either.
I am trying to take data from a text file dumped from one of our databases, i have read the (huge) and oddly formatted text file in, converted it to a 1d array = InPutArray
[Code]...
I have this recently converted application from vb6 to vb.net 2008. One of the errors stated is:'Point' is not a member of 'System. Windows. Forms. PictureBox'.I have searched and not found an alternative to this.Also, it says ReDim cannot change the number of dimensions in an array.
View 8 RepliesI have been trying to assign value to an object array that is defined as follows.Dim englishTextAry As Object(,) = New Object(,) {}I am looping through a dataReader and trying to assign the values to this array with the following code.[code]But the ReDim is throwing an error on dataVal not being an Integer.What am I doing wrong here? Can anyone point me in the right direction?
View 2 RepliesThe code below is the entire class that has the error in it... the errored code is highlighted in red. The error is,'ReDim' cannot change the number of dimensions of an array.
Code:
Public Class clsMap
Dim SR As System.IO.StreamReader
Public Width As Integer
Public Height As Integer
[code]....
I have a gridview in my asp.net website that and I use vb for the code behind. Each time a row is bound an even called the Gridview_RowDatabound event is fired. So what I am doing is looping through all the cells in that row: [Code]
Problem is I get an error saying redim can only change the rightmost dimension. It would suit my needs to change both dimensions here as my final result will be to total each column in the array. what other method can i use if arrays don't suit this task.
I am working on a realtime application where the data is addded to a List(of T) all the time. MB per minute
Elements older than X minutes shall be removed from the beginning of the list to free memory.
As far as i can understand will there be an internal (slow) redim when i add each element after i have reach the number defined with the Capasity metod. (I set that quite big from the start, but the data speed is unpredictable so it can be exceed)
What happens each time i remove and element from the beginning of the list , seems like it takes a lot of time, ? new redim ?
What is the most CPU fficient way of removing 1 or many elements from the beginning of such a list?
I recently purchased Visual Studio 2010 and am wondering if it is possible to use the VS2010 license as a substitute for VB6 license.
View 2 Replieswhen I copied my project and brought it to a lab at school, the code works perfectly. Looks like I have a broken install at home, or perhaps some permission issue.I'm working on a homework assignment. It requires, among other things, that I create a program to read the contents of a text file, write them to an array with an upper-bound of 50, and if is full before the text file is exhausted, to increase the upper-bound by 10. Finally, the program must output the contents of the array into a list-box.Unfortunately, while my program successfully updates the upper-bound, any attempt to output the contents of the array causes an error stating the content of the array is null. Obviously I'm running into an issue when I ReDim the array!
[code]...