I have a delete method for a binary search tree. It only deletes the last two entered values. When trying to delete the root or anything to left of it it returns a null pointer exception.
PublicFunction Delete(ByVal key AsInteger) AsBoolean Dim current AsNode = root Dim parent AsNode = root Dim isLeftChild AsBoolean = True While (current.value <> key)
parent = current If (key < current.value) Then isLeftChild = True current = current.rightNode Else
I have a delete method for a binary search tree that only deletes the last two values that were entered in, and when it tries to delete anything to the left of the root or even the root itself it returns a null pointer exception.
Public Function Delete(ByVal key As Integer) As Boolean Dim current As Node = root Dim parent As Node = root Dim isLeftChild As Boolean = True
I need to compare two tree-structured reports and show comparison results in a datagridview in vb.net. I think using tree structure should be efficient. But note that I DO NOT use a tree view to display results (I found a lot of help in tree view though). All I want to do is to construct two trees, and then search the trees and compare. I do not know how to write this in vb.net.
Anyone knows where I can download binary search tree for VB.Net ? I'm working on a small project for my company and I'm thinking of using BST as a sorting tool.I used to do BST using C++ and I was using linked list. I'm not sure if that can be done in VB.Net but is there any other ways? any input and comments are welcome.
I'm creating a search function to search through a binary file and find a record based on the users input. Surprisingly, that isn't the problem! The problem I'm having is that as part of this I'm using a procedure to display results in text boxes, and I'm getting the error "Too many arguments to private sub display customer"I've encountered this error before, but never really knew what it was... Here is my code.
Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click FilenameCust = "F:\College\CustomersFile.bin"
The current code works fine on the very first fresh but after that it doesn't remember what node was clicked. For this refresh I am looking for a ini file and if found I delete the ini file and refresh the tree. The tree has only 2 parents and never anymore then that.
This first part is the timer sub Private Sub Timer2_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer2.Tick Dim SelectNode As String = Me.tvFolders.SelectedNode.Name Try ' check to see if file exist, if so do refresh then delete file If (File.Exists(appPath & "refresh.ini")) Then File.Delete(appPath & "refresh.ini") [Code] .....
Now the main problem is if you click on a child in parent2 and hit refresh it is not sending Parent2 as a treenode to the search function and it doesn't remember the node clicked. But if you click on a child in parent1 it remembers the node but always refreshes to the top parent1 node. but the very first time you refresh in parent1 it works perfect. Even on the second refresh regardless of which parent you are in it never comes back with failed message from the search function.
I have a treeview which i populate dynamically using an XML Datasource. The leaf nodes in the TreeView attempt to open a URL in an iframe within the page.This all works fine, but i would like the iframe to be hidden until the point the leaf node is selected.what event is triggered when the nodes are clicked?? I tried the SelectedNodeChanged event but this doesnt seem to get triggered!
While fiddling with my code i noticed that when i remove the NavigateUrlField="URL" from my code the tree triggers the SelectedNodeChange event, But does not Trigger if NavigateUrlField="URL" is put back in.
The following LINQ query resp. call of the extension method Select in Visual Basic 2010 is working fine:
Dim qAvSalary = qJobData.Select(Function(e) e.AvSalary) But doing so I am not able to specify the name of property I want the query (e.g. AvSalary) using a string variable. This should be possible if I use a LINQ expression tree. Searching and trying a long time on how to translate the query to a corresponding expression tree was not successful. My final approach is:
My apologies I have posted this in the wrong catagory It should be in VB.net, my mistake)Hi guys I posted this question at the end of another topic I started but I think it will be over looked as the origional topic was solved of the dreamincode community You must all be getting sick of my quexstions by now haha I suppose you don't learn if you dont ask.
Anyway I have used the delete sql method to delete data from a database, I want to refresh the data in the form after the record has been deleted. Do I have to close the form and then open an new instance of it? or is there another way I can refresh the data?
I am trying to write a program which performs a binary search. The user will input the name of a state in a textbox.I have a listbox which is populated with the 50 states in ABC order.The middle of the list must be determined and then determine which half of the list the state may be located. If the middle item is less than the state name the state should be in the second half of the list. If it's greater than the state name is should be in the first half of the list. The calculation for looking at the middle itemi the list is:
middle = CInt(first + last)/2)
There is a variable 'flag' which is initially set to false and then will be set to true if the state name is found. The variable first is initially set to 0 and last needs to be set to one less than the number of items in the list.Below is a very rough program fragment.
Code: Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click Dim i As Integer Dim flag As Boolean = False Dim first As Double = 0
I am trying to serialize object in method binary mode. However, I would like to get a file in human-unreadable format. which means i want to encrypt file. In my memory, if i want to write text into binary file in C, when I set writing mode as binary, I will get a file in human-unreadable format, but in .net, I can't get that.
Im currently using the streamreader/writer method for writing to a text file im considering implementing a binary search to increase the efficiency of searching through records.
Qus: Does binary search require the text file to be a binary file?Do I need to do binary reader/writer instead of streamreader/writer And are there any tutorials regarding binary operations in vb 2010 this is my first attempt at coding binary operations and have no idea where to start
We need to show the value entered and the number that it is compared to in the textbox and concatenated to the binary array. This is the code that I have so far: Public Class Tester Shared array1 As Integer() = New Integer(14) {} Dim count As Integer Public Sub Main() Dim i As Integer [Code] .....
I have an array of words that must be sorted alpabetically using selection sort, I must then be able to search the array with a binary search. I just can't get my head around how you would go about doing it. I know that the words must be first sorted into alphabetical order. Here is the code for selection sort with numbers:
Dim pass As Integer Dim count As Integer Dim minmax As Integer Dim temp As Integer
I have a project in VB2010 it is well connected to the database (DB.accdb) access2007. I'm trying to save the photo into the database table using Binary method. I am successfully able to (Save, Search). my problem is in the EDIT button : I'm supposed to search first to return\display the info+Photo on the form controls (Textbox + PictureBox), now i want to do EDIT, i use sql string : SqlStr = "Update MyTable Set Field1 = '" & Text1.Text & "', PhotoOle = [b]????[/b]"
I'm not able to convert the PictureBox That contains the returned photo to Byes() using : ImageBytes = Ctype(PictureBox1.Image, Byte()) .... not working . -Or- ImageBytes = Ctype(DaraRead!PhotoOle, Byte()) .... not working either.
I have some .doc binary files stored in my database and i would like to now search them all (without converting them to .doc) to see which one contains the word "hello" for instance.
Is there any way to do this search in the binary file?
I have a flat file that is sorted by account number. I am migrating an application that was in vb6 to .Net. The application uses Random file access and uses a binary sort method to find a record.
Here is the code Do While (low < high Or low = high) And (f = 0) 'Checking for an account match middle = (low + high) / 2 FileGet(FileNum, Record, middle) If Account < Trim(Mid(Record.Data, Byte1Start, Byte1Len)) Then [Code] .....
From reading up on this in .Net it seems that using the Binary Reader seek method would be the alternative to using old vb6 random access code. The problem is the Binary Reader Seek method goes by Byte position instead of record number. How to convert my code to use a binary reader.
Couldn't think of a better title.(Background on the problem/me)Okay, so, first question/post here, so hi. Now that that's done with, the information pertinent to my problem. I'm fairly new to VB (and programming as well, aside from screwing around with C++ and learning assembler(well, attempting is the better word) god knows how many years ago), and have only seriously been programming for about under half a year, and my skill level is about at that stage. Only been using VB.Net, nothing older. Depending on the time of day and if I'm home or at school, I fluxuate between VB express and Vis Studio 08. Umm, this program I'm having trouble with was on a test that I took yesterday (took the problem home with me cause I really wanted to figure out what was wrong with it).
The stipulations of the test were: No For->Each Loops No using Built-In Sorting or Searching Functions
I am not the original author of this software project and the code is poorly documented. I am mainly a Java/C++ developer.The program displays the tree structure and allows files and folder to be selected. The program is getting errors with FileSystemTreeView when trying to return nodes on a system with a reserved partition.Here is what is happening: tree.SelectedNode = tree.Nodes(0) 'returns error with system reserved partition.calling, GetDriveList() will properly return all the drive letters - and not throw an error. Only when trying to get a tree.Node() or tree.load() is the error occurring.
