Forms :: Make A Program That Reads Text Entered Into A Textbox And Creates A List Of Items By Separating Entries By Commas?
Aug 18, 2010
Hi, I'm working on a program that reads text entered into a textbox and creates a list of items by separating entries by commas. Everything is working fine, except, because I am using an array to store the items in the list, I have a limited number of entries. This is only a problem because, as it is written currently, each comma counts as an individual entry. Therefore, users can enter ",,," for example, and it would use up 3 places in the array.
I'm looking for a way to check to make sure there is text after the comma before adding an entry. I've attempted to use the .substring command to check the character after, which works until it gets to the last character. Because there is no character after that, it will give an error.
Here is my code for extra clarity:
Public Class frmMain
Dim intCounter As Integer 'Stores the # of commas in the string
Dim Messages(49) As MessageProperties
How could I split up each "firstname, lastname, and country" up? And like add them to 3 listboxes?
I'm pretty much self taught visual basic, using a lot of forums and all, andwas wondering if this is possible. I normally google too but i really have no idea what query I would search (the term). Atm, I'm having troubles making a find replace replaceall thing, so I really can't see myself making something like find '"firstname" : ' and get the text after that till the coma.
how to set the value of the text that is displayed for each item of a list control, such as a checkbox list, but really this applies to most list controls, not just the checklistbox control.
I have a checklistbox control,
Friend WithEvents clstTasks As System.Windows.Forms.CheckedListBox
that I usually want to populate with a list of task names. I call the add method to add a Task object to the list. I know that if I override the ToString method, whatever value is returned by that function will be displayed as the text for the list item.
However, in rare situations, I want to display something else other than just the name. For example, perhaps I want to display the name and the value of another property, such as the value of the Boolean property "Optional" shown in parenthesis following the name.
The best that I can think of is to define a property which is set in the GUI layer and then used by the ToString function to determine how it should behave when called. If the controlling property is set to one value, the ToString will return the Name, else it will return the Name followed by the value of the Optional flag. This seems a little disjoint a kludged to me.
The other alternative which seems a little overkill is to define a new class which inherits from Task, for example TaskOptional, which overrides the Tostring method on the base class. In this subclass, the ToString function would return the Name/Optional flag value. However, this, too, seems a little nuts to have to come up with a new class just to modify how the text is being displayed in the presentation layer. I feel that I should be able to control this in the presentation layer without changing the business object or creating a new derived object.
What is the best way to accomplish this?
For Each CurrentTask As Task In _MasterTaskList clstTasks.Items.Add(CurrentTask, True) Next
how to write a program for a list box having 10 items in that just by a single click on one of the item it should be written on the button if a list is containing notepad than by clicking on the button it should open the notepad?
I have 7 textbox entries and I would like to add them to a listbox and when I close my application it would save them, I have the code for the 7 texboxes and everything like that has been done, but I just dont know how to add multiple textboxs to a listbox then save the list box so when I close the application and reopen it, itll still be there. I know I need a button to add the list to the listbox, but how do I save them, so theyll still be there?
Im trying to come up with a do while statement that reads through a text file till the end while pulling out 3 different matched items, then writing those matched items to ascending spots in an excel file, and then creating a bar graph according to the saved data. Sounds complicated but...I have the program reading the text file, pulling out the first iteration of all three, writing them to an excel file, and I have it even graphing them the way I want it to. The only thing I havent done before (and which is probably the easiest), is creating the do while statement so it keeps searching line to line for the three interactions of what im looking for and writing them to ascending spots in the excel file.
Right now my code works like this, which is perfect for pulling out the first 3 and creating a graph, I just inserting a do while and a rowindex + 1 variable.
vb Dim alines() = System.IO.File.ReadAllLines("C:deviceinfo.txt") Dim amatch As String Dim muvalue As String
[CODE]................
I have a feeling in order to pull this off, I do not want to use the, "ReadAllLines" option and possibly want to put the text into an array.
And do something like: if lines.count > 0
But im not familiar with how arrays work in VB, and more specifically what the syntax is. The other tricky thing I am trying to add is an if statement that adds to a variable (such as i) everytime a line is added to excel so the program will write to ascending lines. I was trying to have the it work with the do while statement but pretty soon realized that if I did: i = i +1. Everytime it went through the loop then the data was going to be on random lines corresponding to their place in the text.
I have to make a program that reads a txt file after reading it, show it in a richtext box and in another tab make the average of the grades the input received sort it by the student id and then in the same rtb sort it by the average of their grades, and finally save it on a new text file.
The text file input is something like this
12 3 10.0 6.9 7.3 19 2 6.7 9.3 10 3 4.5 9.3 4.5
[Code]...
As you noticed in the input the first number is the student ID, the second number is the number of tests made by the student, and the other 3 numbers are grades, in the output the first number is the student ID, the second number is the average of the tests, and the other 3 numbers are grades, I don't have a problem opening and saving a text file and neither creating a tab with 2 RTB , my problem is how do I tokenize or read the input line by line, i guess that i need to use the split function but I don't know how to implement it into the program.
I'm trying to create a program which reads a text file into an array.
[Code]...
But that's just silly so how can I fix this? Lines isn't being assigned a null value it's being assigned the first line of text in the file which has text in it so I'm confused.
I have a appointments program and the user must be over 18. I was wondering is there a way to restrict the numbers entered into a textbox to be from 18 to 100. can this be done with e.keychar
I'm building a small program and I have a numbers only textbox where its content need to be higher than 1. So what I have is a messagebox pop when the text change and its lower or equal to 0. What I'd like to do is have the text changed to what it was before the number was changed to <= 0.Here's what I have for the control:
Private Sub txtDelay_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtDelay.TextChanged If txtDelay.Text <= "0" Then MessageBox.Show("Delay must be atleast 1 millisecond.", "Delay Error") End If End Sub
im trying to make a program in which if the textbox text and the listbox text are the same order, which they are in the picture, a bluie fonted text saying well done appears. However only the red text appears which is only meant to come when the order of the text in both listbox and textbox isnt the same.
Here is the code that i used for this:
listarrays = name of listbox textbox1 = name of textbox
l is the name of the label for correct answer(blue font)label3 is name of label with red font which should only appear for wrong answer
Dim text As String = Me.TextBox1.Text For Each item As Object In listarrays.Items If item.ToString = Me.TextBox1.Text Then
[code].....
use another textbox instead of the listbox but thats just making itmuch harder for me as I already made the full code working with the listbox. My lecturer told me i need to convert both in string so both textbox and listbox are compatible and i did so (see code above) but the correct label doesn't show?
I have designed a form with textboxes for numerical entry. I need to validate each textbox so the number entered is an integer, and is between 0-1000. I am struggling to find how to validate the data entry.
am trying trying to write some code for a ComboBox that does the following:
1. Allow the user to enter text into the combo box to type entries contained in the list source.
2. Enable autocomplete to assist the user in selecting entries in the list source, both from dropped down state and non dropped down state.
3. Restrict the user from typing an entry that doesn't exist in the list source.
My requirements are:
1. The ComboBox must run some code after a selection has been made or the user has finished typing an entry (not after the focus has been moved to another control)
2. The code must only run once after the user has made a selection from the combobox or has finished typing an entry
The problem: To achieve the above functionality, I had to run code on numerous event's. Sureley there is a better way, here are the events and the reason for the code:
SelectedIndexChanged:This is the code that is run when the user makes a selection. No Mystery here
KeyDown:
Must Run If e.KeyCode = Keys.Return Then ComboBox1_SelectedIndexChanged(Nothing, Nothing) End If
I have a Combobox, set to DropDown style that is bound to a Collection.I want to enable the user to type text in the edit portion of the combo and if the value is not in the list SAVE the data in a collection if it is not already in the collection, of course it wouldn't be if it was not
I'm working on an application to write reports for the work I do. I have a Grid filled with Textboxes inside a Scrollviewer to input data for the report. I am using the arrow keys to navigate around the grid. The focus moves to the expected Textbox when the arrow keys are pressed but if I press any other key it is immediately followed by a Tab to the next Textbox. Even a Tab is followed by another Tab. Following is the code I use for the navigation.
Private Sub svReportPage_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Input.KeyEventArgs) Handles svReportPage.KeyUp Dim focusDirection As FocusNavigationDirection If e.Key = Key.Right Then focusDirection = FocusNavigationDirection.Right If e.Key = Key.Left Then focusDirection = FocusNavigationDirection.Left [Code] .....
I'm chasing code that is going to allow me to have multiple text boxes on my form, but when the form is first opened, it will only display one textbox. Once data is entered into said text box, i want it to display the next textbox, and so on. Is there a way to have these hidden?
So I'm trying to program a selection structure to display different commission rates per sales entered in a textbox.I need to have the commission total display alone. I have the simple interface done, but I'm having trouble forming the selection structure.
I am working in VB 2008 and I have a textbox on a form that is used to enter a parcel number. I can enter the number in a 15 character string such as 12345678...... and it works just fine. The parcel number in real life contains dashes to make it easier to read, decipher, etc. so it looks like 12-3-45-67....... Under the textchanged subroutine for the textbox I have a case statement set up that checks the length of the parcel number as it is entered and inserts the dash accordingly.
I have been reading through Atheists posts in regards to client-server and TCP client/server connection's. But how do i go about writing a program with 1 client and server where the client side creates a text file.Once the server sees there is a text file it connects and downloads it to itself or the client pushes the text file to the server.Once on the server i will read the text file and put its info into a sql db.
I want a textbox to have autocomplete. I want the completion to be based off of text that has been previously entered into the textbox. My method of saving seems to work but when i close the program and re run it the autocomplete suggestions arent there anymore.
