Text File Operation Using VB?
Dec 29, 2010I have to code in VB.Net to delete first 16 columns from given input .csv file .[code\...
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How To Do Simple SQL Like Operation On Text File
Jan 20, 2010I have a dbase.txt file with some data in it. i.e -
Institution Course StudentID
XZY ABC 2010-1111111 "the spaces between columns is one tab space"
XYZ ABC 2010-1222222
XYZ ABC 2010-1333333
I want to perform simple SQL like operation - i.e -
SELECT * FROM dbase.txt or
SELECT Institution FROM dbase.txt WHERE StudentID=2010-1111111 and an insert operation like -
INSERT dbase.txt VALUES (XYZ ABC 2010-1444444)
I have written some code which is not even closer to what I mentioned above. My program can read only the whole text file. There is a menu, but not functioning well, as well as my write function which is not working at all.
Below is my code -
Imports System.IO
Module Module1
Sub Main()
Dim intInput As Integer
Console.WriteLine("Main Menu")
[Code] .....
Display Results Of An Operation To A Text File Temporarily?
Oct 21, 2009I am writing my own script for a simple calculator that determines if a number is prime, and its prime factors.[code]The loopcount = compare - 2 means I want the loop to be 2 less than the square root of the answer so that when do a descending calculation (loopcount = loopcount - 1) it doesn't see if 1 or 0 is a factor of the answer. for the calculations after that, I want, every time n1 = n2 (a whole number factor of the answer), I want to report those results to a text file (n2 and n3) in this format "(n2, n3)" then go to the next line. and continue to execute the loop until the loopcount is zero. Currently, when I run the code, the application closes when I click the prime button (button that runs this code) and I don't know why. This is my first semester in school, and have never coded before, so I am a definite laymen with code, but I really really want to learn it (hence why for fun im just creating algorithms for different things).
View 2 RepliesGet Numbers From A Text Box Then Use Them In A Math Operation?
Mar 13, 2010How to get numbers from a text box then use them in a math operation.
View 4 RepliesConvert A Delphi Copy Operation To A .Net Substring Operation?
Jan 4, 2012I'm trying to convert code from Delphi to .Net. I'm stuck on one line:
//Delphi code ss := Copy(ss, Length(ss), 1) + Copy(ss, 1,Length(ss) - 1); 'vb.net code ss = ss.Substring(0, ss.Length - 1) + ss.Substring(1, ss.Length - 1)
Delphi combines the two substrings, while .Net just concatenate them like a copy.
Correct Dim Command For Scrolling Text Operation?
May 16, 2010I am working on a scrolling text operation within a VB.net/ASP.net application. However, I am getting an error command from the following two commands:
Me.ScrollingMarquee.InnerHtml
Return Me.ScrollingMarquee.ClientID
The error is that the InnerHtml and ClientID properties are not recognized as members of the class. Apparently I am not using the correct DIM command for "ScrollingMarquee" (e.g. "Dim ScrollingMarquee As Control" is incorrect)).
The Operation Has Timed Out On Downloading File
Nov 18, 2011i have a datagridview and each row got link.. and i using timer and backgroundworker as downloading file.. the 1st file download, its perfect working.. but when its going to download 2nd link from datagridview, nothing happened.. even its said, "The operation has timed out"..
[Code]...
Entering Text In Windows Application Textbox Error: Operation Has Been Cancelled Due To Restrictions On This Computer
Nov 30, 2011I have a windows application written in VB.Net 2008, framework 3.5. This app is running on 2 remote desktop servers. I have one user who receives error, This operation has been canceled due to restrictions in effect on this computer. when entering in a text box. When he uses the application on Server 1 he does not receive the error. It only happens to this 1 user on one server.
View 10 RepliesFile Watcher Error - "Cross-thread Operation Not Valid?
May 21, 2009I have created a file watcher but I have a problem with the file watcher.here is the
vb.net
Inherits System.Windows.Forms.Form
Private watchfolder As IO.FileSystemWatcher[code]....
And I have the Following error
InvalidOperationException
"Cross-thread operation not valid: Control 'txtmonitor' accessed from a thread other than the thread it was create on."
Forms - Binary File Read Operation - Make Searches Fast Without Freezing The UI
Feb 9, 2011I have a windows form which to summarize lets the user open a file containing 32 bit hashes, then search for one of them. The hash is then converted to its string representation. The application is giving the results I would expect but I'd like to make it execute faster than it does now; some files can be pretty big > 100 MB.
I'm doing the file read using a BackgroundWorker object to display progress updates and ensure that the UI is available during the process. But for that i need to add a System.Threading.Sleep(1) instruction in the loop; otherwise the application freezes with big files. And System.Threading.Sleep(1) creates a noticeable lag. Any suggestions on how to make searches fast without freezing the UI? Getting speeds comparable to hex editor programs for example.
VS 2008 - Read Text File - When Click Button Add Text From Combobox Is Added To Text File
Jan 4, 2010I have one combobox, two buttons (Add and View) and listbox. When I click button Add text from combobox is added to text file. This is code for Add button:
[Code]...
Error: Mscorlib: The Requested Operation Cannot Be Performed On A File With A User-mapped Section Open
Apr 6, 2012I've written a VB.NET program for a client that stores all of its data in XML files. I use the XMLReader to read the data into a dataset. When I run the sub to encrypt the XML file, I'll get the following message: Error: mscorlib: The requested operation cannot be performed on a file with a user-mapped section open.
It doesn't happen all the time, so I know it does work. But on occassion, I'll get this message. I've been all over the forums and I've tried everything I've read to try and stop this error.
I close the reader object and set it equal to Nothing. I've even tried using DoEvents to make sure the object finished closing before running the Encrypt sub. Nothing has helped.
I develop on a x32 PC. It works fine on the development machine. But then, when the client runs it on a x64 PC, he gets these errors. Could the x64 system really be running so fast that the .Close() and the = Nothing and evern the .DoEvents() can't keep up?
Take A Comma Delimited Text File And Then Select All Unique Records Based On One Of The Fields In The Text File?
May 7, 2010i want to take a comma delimited text file and then select all unique records based on one of the fields in the text file. should i read the text file into a data table or just use a data reader?
View 7 Replies[2008] Use The Treeview To Display The Text Of A Rtf (rich Text File) File When An Specific Node If Clicked?
Aug 30, 2009Hi, i'm trying to use the treeview to display the text of a rtf (rich text file) file when an specific node if clicked.HomeOMGWOOTFor example, if i pick OMG, i want the text of lol.rtf to be displayed on a richtextbox. But somehow i just can't manage to get it... I know to import the text of a .txt file to a textbox, but using the treeview makes it more complicated.This is the code im using right now:
Private Sub TreeView1_NodeMouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeNodeMouseClickEventArgs) Handles TreeView1.NodeMouseClick
Select Case e.Node.Index
Case 0
[code]....
Another thing is, that i can't import the *.rtf text into a richtextbox and i don't know why.
File I/O And Registry :: Opening A Text File Into Multiple Text Boxes Using Loops And Arrays
May 20, 2009So I'm in the final stages of finishing a program I've been working on for nearly a year now, and this is basically my final hurdle. The Save dialogue is working beautifully, with 'flags' in order to switch it over from the regular input into text boxes to the Listbox input protocol.
However, I'm having a *** of a time getting it to take lines from the text file and put them in the proper text box. Here is an example file:
Quote:
SHOWNAME
CALLNAME
BREED
[Code]....
So with the sample file I provided above, in the textbox named callNameText would appear "SHOWNAME", and so on and so forth. With this build, I get a NullReferenceException on the "Me.Controls(strboxNames(i)).Text() = strAllText(ati)" line.
Use Treeview To Display Text Of A Rtf (rich Text File) File When An Specific Node If Clicked
Feb 28, 2009i'm trying to use the treeview to display the text of a rtf (rich text file) file when an specific node if clicked.HomeOMGWOOTFor example, if i pick OMG, i want the text of lol.rtf to be displayed on a richtextbox. But somehow i just can't manage to get it... I know to import the text of a .txt file to a textbox, but using the treeview makes it more complicated. [code] Another thing is, that i can't import the *.rtf text into a richtextbox and i don't know why.
View 3 RepliesCombo Box With Text File - Match A Selected Name To A Text File And Read From It
May 7, 2010Ok so I have a combo box that lists a set of names. What I want to do is match a selected name to a text file and read from it. The text file contains the same name and has grades listed below:
ex.
Johnny Bravo
30
10
Create A Text File Or See If A Text File Exists When Application Starts?
Nov 3, 2009I want to create a text file or see if a text file exists when application starts. The problem I was having was after creating the text file, I tried to write to text file and got an error saying that another process was using it.
Dim test As String = My.Computer.FileSystem.SpecialDirectories.MyDocuments & " est1.txt"
If System.IO.File.Exists(test) Then
MsgBox("File Loaded")
Else
[code]....
I looked up topics on filestream, but am unsure if this is how to use it. Is my code ok? Is there another way to create a text file?
Encrypt Text File - Save Data From Datagridview To Text File
Jul 22, 2009I save data from datagridview to text file. I also load the same data from text file into datagridview for edit and update the same thing to text file. Let say this text file i called as Drill.txt. I have another text file called header.txt which need to match its value with the value of Drill.txt file then overwrite value from Drill.txt to header.txt. Now i want to make my Drill.txt in encrypted format to prevent anyone to open that file and modify out of program. They only can modify it through the program
[Code]...
File I/O And Registry :: Read One Text File And Put Lines In Different Text Boxes?
May 12, 2009i have 5 textboxes in a form. I have a streamwriter that writes all of their text to on text file like this:
Code:
Dim xfile As String = Application.StartupPath & "/Set.txt"
If File.Exists(xfile) = True Then
Dim writex As StreamWriter = New StreamWriter(xfile)
[code]....
I was wondering how to get the text under the each number and place it in the corresponding textbox.
Forms :: Call A Process Which Is Spliting A Text File Into Various Text File?
Oct 14, 2009I am using a thread to call a process which is spliting a text file into various text file and folder using the system.io , now when calling the Textsplit() with thread on click of a button i am getting the error below , how to use thread and why this error occurs.
Cross-thread operation not valid: Control 'txtbox_destn' accessed from a thread other than the thread it was created on.
Ping A Contents Of Text File And Write Resulting IP To Different Text File?
Dec 3, 2011I am trying to ping a text file("C:/Domains.txt") which is a list of domains, then have the resulting IP address written to a different text file ("C:/IP_Addresses.txt"). And this action will be done with a Button_Click.
View 8 RepliesRemove Character From A Text File And Prevent Crash W/ No Text File?
Apr 7, 2011All I would like to do is remove one character from the line of the text file that I am reading, which is the first character and also prevent the program from crashing if no text file is present.Here is the code. Can anyone notice where I am going wrong? I thought the "if" statement would cover the crash but it didn't. Clueless, but sort of have an idea on the character removal.
Private Sub RadioButton_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton.CheckedChanged
Dim fileReader As System.IO.StreamReader
Dim lineRead As String
If RadioButton.Checked Then
[Code]...
Scan A Text File To Determine If It Is A Text File And If It Contains Any Non-ASCII Characters?
Jan 27, 2012what would be the optimum code in VB2010 that check a file to determine:
1) is it a text file, and
2) if it is a text file, does it contain any non-ASCII characters
Note that LF, CR, and EOF would be expected, and should not be flagged. I can think of 3 - 4 ways to do it, but there may be a 'best' way in terms of simplicity and speed.
Checking If Text Contained In One Text File Is In Another Text File
Aug 24, 2011i need to search through the host file on pc to check whether entries contained within another text file are in the file.
View 1 RepliesHow To Make The Text In A Text Box Into A Text File That Auto-creates In A Specific
Jan 24, 2011make the text in a text box into a text file that auto-creates in a specific?
View 4 RepliesMake The Text In A Text Box Into A Text File That Auto-creates In A Specific?
Aug 15, 2011make the text in a text box into a text file that auto-creates in a specific?
View 4 RepliesCreate And Write To A New Text File From An Existing Text File?
Sep 2, 2009I have a very large text file about 4 million lines that I would like to separate into several small text files based on the strings contained in the first column of the text file. I want to open the large text file, choose the lines that apply, create a new text file with a name that has a number at the end of which will match up with the value in the first column of the text file. I want to then copy the applicable lines to the new small text file, save and close it. I'm not sure how to go about doing this after opening the large text file and using the readline method. What if the folder does not exist? Do we have to create it? I want this procedure to be general, as there could be up to 25 million lines in the text file.
View 13 RepliesText File And Then Taking The Values From The Text File And Inputting
Dec 3, 2011reading a text file and then taking the values from the text file and inputting them in an Access database. I don't know how to do most of it, but I decided to start by reading the text file. However, whenever I click the button to read the file, I keep running into my catch error exception. Help!
Here is the Private Sub ImportButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ImportButton.Click
Dim CustomerStreamReader As StreamReader = New StreamReader(InputOpenFileDialog.FileName)
Dim vCustomerString As String
[Code]...
IDE :: "File Download" Dialog / Way To Perform Download Operation At Back-end
Jun 15, 2010I have created a application in vb.net. I am using Web Browser control in it.With this Web Browser control I open an URL and tries to Download something, it will populates an dialog for "File Download" to Open/Save/Cancel for the file..I am downloading the .ZIP file, and it will not show the checkbox for Automatically Do.Is there any way to perform the Download operation at the backend, means it will not ask me for such options.
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