Deleting An Entry From A Text File?
Apr 5, 2012
i have to make a program thats a telephone directory. All the information is in different text files. The user has to be able to delete and add people to the directory, i have made it so they can add peple no problem but im having a hard time with the code for deleting them. The questions requires that they only type in the persons name and then they are delted but in the text file they are listed as Fred,123-1234 so when they hit delete the person does not get deleted becuase it is registering there full name as Fred,123-1234 i need it so that it just sees the word Fred and deletes it heres the code. I cant figure out how to do it itried using a query but that didnt work either it just looped infinitely.
Private Sub btnRemove_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRemove.Click
Dim Removename As String = txtName.Text
If Removename <> "" Then
[Code]...
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Jun 14, 2008
I need help on improving the performance of a program I wrote some time back. This is the main performance issue of the program below. Basically I need to look through some data that is displayed to a user in a list view and determine if the data is a duplicate of any other data in the list. If it is I need to delete the duplicate before my program continues.The below code does the job just fine, however the list view of data has approximately 30,000 rows of data. Hence looping this list 30,000 to the power 30,000 times makes the program very slow. Note subItem(4) in the data is the "unique" identifier that I later discovered was not so unique....
This was a work around function implemented in the code back when I wrote it (not meant to be permanent). I know that listView is not Ideal to store this much data.how to store the data in a more efficient manner or improve the performance of the Search and Delete [code].....
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Jun 10, 2009
i've made a playlist system. It writes all the music file url's to a file separated by a comma. But I want to have a delete button that removed one of the playlist items.
This is what I've tried:
Dim EntireFile
Dim myReader As New System.IO.StreamReader(playlist, System.Text.Encoding.Default)
EntireFile = myReader.ReadToEnd()
[Code]....
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Jan 28, 2009
Is it possible to name the txt file when I create it based on a text box entry?
If for example the text box was called variable, could I take the information in that text box and name the file that.
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Mar 22, 2009
I know that Deleting a specific line in a sequential text file is impossible but instead copy the needed lines and not copying the unneeded ones to an output file .. killing the old one and renaming the new one with the same.. I can't make this step...
That is my record file
Code:
Input #1, CustomerName, CustomerHomeAddress, CustomerBussAddress, CustomerTel1, CustomerMob1, CustomerID, DateRent, CarRegPin
Code:
"Josek Sam","68 West Land Street","149 Union of States","4524563","45635463","JOSKSAM1",#2009-03-02#,"MILANCGLZ2008"
"Josef Malm","142 Unions Street","64 Hamersters Street","452504","42542054","JOSFMALM2",#2009-03-06#,"MILANCGLZ2008"
"Dave Green","131 Oxford Street","96 BlueBane Route","452542452","43254345","DAVGRN3",#2009-03-07#,"MILANCGLZ2008"
I made a form that when you put your CustomerID in Text3 Box.. it access the records and make some calculations. now.. The customer will return the car.. Then his data should be deleted.. I want to know how to make that when I enter the CustomerID and press on the Command button .. It copies the other lines to a new output folder and doesn't copy these ... So it appears to be deleted using this way..
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Jul 25, 2011
I am doing some txt file programming and i came to the problem...I could write what is in a combobox in a txt file to then read it when the app is opened again.But if i want for example to delete a line in the text file.I want for example if i have in the combobox 1,2,3,4,5 and 6 and i select 5 and i touch a button delete , i want the application to check if the value(5 in this case) is in the etxt file and delete
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Feb 24, 2012
I need to delete some characters in a line from a text file.
How can do this using forms?
for example I have
1.pencil hbewe wqeqwe
2.pencil 2bq
wqweqeqw
3.eraser eqweqw eqweqw
I want to keep only the
1. pencil
2.pencil
3.eraser
in the file. How to do that?
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Jan 12, 2010
Suppose I collect names from a text box and append them to a file ( names.txt) during the day. How can I either delete the file or at least empty it so tomorrow I can start with a blank file again
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Jun 21, 2010
Ok so i have a uni assignment to delete lines of text out of a text file, so far i have figured out how to search the text file for specific bits of text, i,e name of user, ive also used a loop to find out what line in the text file the specific line exists as...my
code so far is
Dim line As String
Dim Input As StreamReader
[code]....
the selected policy is what im tryin to use to write over the line of texts that already exists however i think that maybe instead of deleteting what exists it will just move it down a line and make a blank line
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Jun 21, 2010
I'm writing a email program and i need to make it so that when I delete a item from a listbox it also deletes from a text file. Right now all it does is delete it from the listbox and when the program is reloaded its still there.
Dim arrEmailSelect As New List(Of Integer)
Dim fileContents As String
Dim thisEmail As New email
[Code]....
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Dec 16, 2011
I have the following code to read a csv file and copy each line to another file as long as it does not contain certain strings, it seems to work a little but it leaves some lines in it shouldn't, and it's also taking lines out it shouldn't as if I keep running it again on each output file it eventually takes everything out!
Private Sub Strip_File()
Microsoft.VisualBasic.FileOpen(1, tFile.Text, OpenMode.Input, OpenAccess.Read)
Microsoft.VisualBasic.FileOpen(2, "C:AcmeIPPMaster.csv", OpenMode.Append, OpenAccess.ReadWrite)
[Code]....
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Sep 27, 2009
I am adding line entries in a .ini file. The problem is, I am creating duplicate lines in the file, which I do not want to do. I searched this issue online, and the consensus is to use an array, loop through for duplicates and create a new file. However, being so new at this and teaching myself how to code no less, I am at a dead end. This is not a school project, it is something I am doing for work on my own time. I have all of my code done for the program except for this last step.
[Code]...
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Jan 28, 2010
Ok, I'm new so go easy on me. I don't know if this is in the right section, so if it's not, sorry.
Goal: To delete extra lines in a text file.
[Code]...
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Mar 15, 2012
I know how to search a text file for a specific line, but what I don't know is then how to delete that line?My text file is set up as such:
021,Donovan,56 Eynesford Crescent,Bexley,SE5 1TR,09/08/1967,13 March 2012,Bronze
062,Fredrikson,6 Freil Road,Gravesend,GR9 TRB,12/06/1995,13 March 2012,Silver
So I know how to search for the 3 character integer at the beginning of each line, but how do I then delete this line?
I'm currently using this code
Imports System.IO
Public Class Form6
Private Sub SearchBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SearchBtn.Click
[code].....
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Sep 20, 2009
I need to be able to search through a text file and find a line of text, then delete that line and the 7 previous lines and also the line following the searched line. Basically the program creates student records to a text file and asks if the user wants to mark the record for deletion then when the user exits the program, I want it to find the records mark for deletion and delete them.The records in the text file look like this:
Name: Some, Students, Name
Age: 20
Phone Number: (555) 555-5555
[code]....
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Jun 12, 2011
ine from a text file. This is for an ASP.net Webpage. I will have a file called ources.txt. Example data of this file looks like this:
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Oct 25, 2009
I am trying to bind a textbox to a binding source (using the IDE DataBindings Editor) and it works fine except for one thing: if I delete the text I get the subject error. What I want to happen is the datarecord field be updated to a dbnull value -- how do I get that to happen?
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Dec 25, 2010
How to exit from a multi-line text box without deleting the text inside when press enter
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Sep 8, 2009
i am pulling together a cash register that will allow both bar code product entry and manual key entry.imagine if you have a tin of beans in front of you, in a small corner shop they would probably type "47" and then hit "Produce". Fairly straight forward as I have the button Produce to act upon my code and update my salestrans.mdb but,if you scan the bar code I want the same form to handle both 'real' actions, (i assume that keyboard emulation barcode scanner includes "ENTER" after providing 13 digits)....
Q. in perhaps a long winded way i want to know how to kick off an event based on the "ENTER" key being activiated by the barcode scanner)?i do not want to have to hit any buttons if i am scanning bar codes.
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Nov 4, 2011
What is the code for ignoring the case of an entry while checking to see if the entry is correct or not... (i.e. in a flashcard program... given definition, asks for the name) I don't want the case of a character to affect whether the answer is correct or not.
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Mar 21, 2010
I'm trying to set up Name entry in a text box, and I don't know how to make it so it is Letters only, not alphanumeric. (spaces too) How do I set up a date label for the form using the current date? On a try statement, I'm attempting to set up two different Quantity exceptions, one for radio buttons and one for quantity in a text box, is this possible or do I have to break it up into 2 statements? Or do i have to set up a numeric if statement like I'm trying to do with the name entry.
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Jul 10, 2009
I am trying to make a program with a bar code reader for the first time. I am programming with VB 2005. I want to differentiate a bar code entry to keyboard entry. My questions:
1. Does bar code reader generate a keydown (or keypress) event for each of the digits of the entry? For example, if the barcode read: 1234567890, does that mean that there will be 10 keydown (or keypress) events for that single barcode that was read?
2. I have read from the posts that the best way to differentiating keyboard vs bar code input is to analyse the time between keystroke (for less than certain number of milliseconds).
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Jun 21, 2010
I was able to successfully connect my database using connection string, i am having a hard time finding tutorials on how to add the items in a textbox. [code]...
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Sep 27, 2010
I need to change the Text property in several menu entries, for example to display several of the last files that were opened in my App.
I save the names of the last files opened, in the proper sequence, in a file that is called when my App starts.
When the App starts, the names stored in the file are assigned to the menu fields, such that the user only has to click on the desired file to load.
When the user opens a file not listed, the new name is added at the beginning of the list, and the file names are re-assigned to the Text property of the menu entries.
This works fine in VB6, but when I re-assign the string in the Text property, some menu entries are updated, but some are not.
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Apr 8, 2010
Here's a silly question. I cannot believe I've spent so much time trying to figure it out. I have a textbox where I enter numbers, such as 12, 12.3, etc. I would like this data to display as 12.0000, 12.3000, etc. My line of code looks like this:
[Code]...
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Feb 25, 2012
(If a letter is entered it need the program to show in the text box invalid entry)
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Apr 1, 2010
how to set the value of a Public Class variable to a text box entry?
I have a variable declared in the Public Class that was assigned to a public variable and I want to be able to have user entry via textbox.
If i change the variable to an integer and set it to textbox my program wont build.
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Mar 11, 2010
I have the following code for part of an application I'm building and I need some instruction on how to store this value and carry it to the next part of the program. Private Sub dateEntryTextbox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles dateEntryTextbox.TextChanged
[Code]...
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Jul 21, 2011
Okay, I've got a datagridview in my WinForms app that auto-builds the column list from a datatable schema. It's working fine, except that it allows the user to enter values too long for the database field. For example, I have a "name" field that is defined in the Sql-Server database as a varchar(50). Is there any way to limit that cell (column?) so that it only accepts 50 characters? Right now it lets them enter anything and throws an exception later.
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Jul 11, 2009
I am trying to make a program with a bar code reader for the first time. I want to differentiate a bar code entry to keyboard entry. My questions: 1. Does bar code reader generate a keydown (or keypress) event for each of the digits of the entry? For example, if the barcode read: 1234567890, does that mean that there will be 10 keydown (or keypress) events for that single barcode that was read?
2. I have read from the posts that the best way to differentiating keyboard vs bar code input is to analyse the time between keystroke (for less than certain number of milliseconds).
View 4 Replies
