File I/O And Registry :: Reading File Properties Without Loading File
Sep 19, 2010I want to be able to able to read the dimensions of a TIF image without loading the entire file.
PS Using Visual Basic 2008 on Vista64.
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File I/O And Registry :: Binary File Primer - Read The Nth Record Without Reading The Whole File?
May 4, 2009I need to write data to a file, preferably in binary format, but I am unaccustomed with the concept. Where's the easiest place to get the basics? I could come here with a specific need, but I'm at the point right now where I am more willing to work within the confines of keeping it simple.
Here's what I know:
1. how to open a new file
2. how to specify the record length
3. how to close the file
Some specific questions:
Does the record length have to be constant throughout the file?
Can I read the nth record without reading the whole file?
File I/O And Registry :: Reading A HTML File And Replacing Certain Parts?
Nov 5, 2010friend of mine has no HTML knowledge so I'm attempting to write a program that replaces certain parts of a html file to suit his needs.I've edited the HTML file and marked certain parts with "tags" like this:
#IMAGEURL1# I have a textbox where he can copy + paste an image URL and hopefully the #IMAGEURL1# is replaced with the contents of the textbox.
So can someone please enlighten me to-as how to open a HTML file (there's no textbox to display the contents just yet, I'll add one if needed), find the specified text and then replace it with whats in a textbox.
File I/O And Registry :: Reading TAB Delimited File Using MS Text Driver
Jun 14, 2011I am trying to import a TAB (NOt comma) delimited text file into a DataGridView. The following code works fine if I have a comma separated file. All I have to do is change the FMT to "Delimited".It just does not work with FMT=TabDelimited. All columns are read into single datatable column. The text file is ANSI text and I have double checked to make sure Tabs are tabs and not spaces, even exported a sample Tab Delimited file from Excel.Can this even be done using Text Driver? [code]
View 2 RepliesFile I/O And Registry :: Reading File 2008 Express
Nov 19, 2008I'm new to Visual Basic. I'm trying to get this code to read a .txt file line by line. If the only thing that the line says is "B" it should add one to the intTotalBoys integer and so on with G for Girls, F for Fathers, and M for Mothers. I'm not sure why it won't work. [code]
View 4 RepliesFile I/O And Registry :: Reading From A File And Ignoring Comments?
Oct 28, 2009I would like to read from file, and ignore lines that start with --. I know how to read line by line but i just need to ignore those lines.
View 3 RepliesFile I/O And Registry :: Reading/Writing Objects To File?
Jul 5, 2009So I need to write out an object to a text file as well as read in objects from text files.How do I accomplish this? This is the code i've used to read and write just simple lines of text. Is there a small modification to this or just a different function i use to read in an entire object?
Code:
Dim path As String
path = "Security.txt"
[code].....
File I/O And Registry :: Text File Reading And Writing?
Jul 17, 2010I have just recently been using VB 2010 after using VB5. I have noticed a lot of changes. The problem I have is that I wish to open and save text files to and from arrays in the background. I've attached what I would do in VB5. I have searched around, but all the examples I find use a Textbox instead of an array. Can anyone show me how I can do this with VB 2010?
View 1 RepliesFile I / O And Registry - Reading Certain Line From TXT File
Aug 14, 2010I am in the process (slow process) if learning vb.net by trying to create a simple application that will read and write (save) chosen information to a text file. The application has text boxes (name, email address, etc) and I want to read information from certain lines in the text and place in the given text box.
Code:
Dim StreamToDisplay As StreamReader
StreamToDisplay = New StreamReader("C: esting estfile.txt")
TextBox1.Text = StreamToDisplay.ReadLine()
StreamToDisplay.Close()
Currently it's reading the first line of text (which is "[username]").
Text file (testfile.txt) is attached
File I/O And Registry - Reading A File Which Is Being Used By Other Process
Oct 5, 2004I have read a log file which is being used by a process. I could open the file in notepad or similar applications. The log file is not written by my application.
File.Open or streamreader gives me the following error: "An unhandled exception of type 'System.IO. IOException' occurred in mscorlib.dll. Additional information: The process cannot access the file "E:parkvbproject1.NETinsystem_log" because it is being used by another process."
File I/O And Registry :: Reading A Text File?
Oct 30, 2009i created a text file with some employee data in vb 2005, on my form i i have a bunch of textboxes and a combobox. i can load the employee numbers manually into the combobox but want the employee details to show in the textboxes when selecting the different employee numbers. i declared a structure with the various fields and a reader to read the text file. here is where i am stuck. my code thus far:
Public ABCStreamReader As StreamReader
[Code]...
File I/O And Registry :: Reading Craigslist RSS XML File?
Jan 21, 2009I'm currently working on an app that grabs listings from a craigslist search (by saving the RSS feed from the results page as an XML file, and then reading it). However, I'm hitting an error.I have the code below in my Form1_Load event:
Code:
My.Computer.Network.DownloadFile("http://greenville.craigslist.org/search/sss?query=ipod%20touch&format=rss", "C:UsersBillDocumentsCLtemp.xml")
Dim CLsr As New System.IO.StreamReader("C:UsersBillDocumentsCLtemp.xml")
Dim CLxr As New System.Xml.XmlTextReader(CLsr)
[code].....
Basically I'm grabbing the RSS feed from the web [URL] currently just a test search for iPod touch being sold in Greenville, SC) and saving it as an XML file to the HDD temporarily to be read with a stream reader. Then, it just displays message boxes one after another showing the title of each post. However, when I run the program, I get the error on this line:
Code:
Dim posts As System.Xml.XmlNodeList = CLdataDoc.SelectNodes("rdf:RDF/item")
"Namespace Manager or XsltContext needed. This query has a prefix, variable, or user-defined function."
File I/O And Registry :: Reading Input From File?
Jun 25, 2009I'm working with VB.NET 2003 on Windows XP.I'm trying to read in from a text file and populate a listbox with the data. Below is my code:
Code:
If (File.Exists("users.txt")) Then
Dim text As String
FileOpen(1, "users.txt", OpenMode.Output)
Do
text = LineInput(1)
[Code]...
This code never populates the listbox and then on top of that it erases everything in the text file. What am i doing wrong?
File I/O And Registry :: Reading Multiple Keys From The Registry?
Aug 27, 2008I am writing an application that connects to a specific com port. This com port can change depending on how many physical ports are on the PC, and if other USB devices have installed com ports before this one.
I have the communication to the com port all working great, but I need to get the com port description not just the "COM#" which is all I currently get.
I found in the registry where the description is stored but am having trouble doing what I need.
In this key:
Code:
HKEY_LOCAL_MACHINESYSTEMControlSet001ControlClass{4D36E978-E325-11CE-BFC1-08002BE10318}
there is a varied number of sub keys. The are numbered 0000-NNNN depending on how many ports you have. Inside each of these keys, there are multiple values, although I am only interested in one or 2 of them.
My problem is, that I do not know how to get a list of the subkeys (the 0000-NNNN keys/folders) from the original key I posted. I have looked through a few registry tutorials, and I can view the default value in the listed key, but I could not find how to list the subkeys of the listed key.
Does anyone have any sample code they could share that shows how I can get a listing of subkeys, and then run through those subkeys checking for a specific value in one of the strings contained in the subkey?
I am using VB.net 2008 and Windows XP.
File I/O And Registry :: Loading Files Into A List View
May 23, 2009I can't find any way of loading all files with e.g (.txt) from a specific directory: C:UsersChristianDocumentsMy Logs I use Visual Basic 2008 .NET, this is how I try to get it:
1. When the form loads it should retrieve the full path and title of the files and then put them in the List View control.
2. When the user marks one file in the list view and then clicks a button the text content should be displayed in a multi line textbox.
[Code]...
File I/O And Registry :: Loading RTF Files In RichTextbox Control?
Jan 12, 2009I need some help loading RTF files in a RichTextBox Control. The RTF file i have has a lot of textbox and some graphics. I tried several methods, but i cannot load the RTF file correctly.Here is what i have so far:
Code:
Private Sub btnLoadFile_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLoadFile.Click
Dim fn As String
Try
[Code]...
I suspect that the LoadFile method cannot read the TextBoxes in my RTF file, or maybe i'm missing something. Attached is the file i'm working on.
File I/O And Registry :: Saving Data From Class Properties?
May 28, 2009I currently have a class
Code:
Public Class Customer
Public Property AccountNumber() As String
Public Property PMDue() As String
[code]....
Account Class is initialized as new customer. To save the data from each property in the Account Class, I'm currently looping thru the properties each time Account obtains new data. I tried to simplify the process by the following line...
Code:
CustomerStreamToWrite.WriteLine(Account)
This does not work as written. I figured it would be much faster. It did not write out the property data. It saved "WindowsApplication1.Customer" Not exactly what I wanted. Is there a method to get it to save the properties in a written out style by just using the class name?
File I/O And Registry :: Reading Xml Attributes?
Aug 9, 2009I am trying to read all the attributes, there are 3, from a single node. This is what I tried from an example I found:
Code:
Dim xl As New XmlDocument
xl.Load(XMLfile)
Dim rn As XmlNode = xl.SelectSingleNode("p1")
[code]....
I have used a messagebox to show the xl.OuterXml, I see the file is loaded.
Reading A .txt File And Loading Data For Processing?
Feb 27, 2009I have a text file that contained about 50,000 lines of data which are all the same format as below
0000710950,INFEED NAME,40,INFEED TIME,0,ENTRY,55649,MCS,[code]....
What I would like to do is read this data in as fast as possible either line by line and processing the data as I go by line. Or read the whole lot in and THEN process it, which woulkd be the fastest ? I used to do this in Excel but want to transfer it to VB and don't know really how to get started I have the following but would like to know how to get the columns into a named array and then how to itterate through array.
Dim myLines() As String = IO.File.ReadAllLines("C:SYNC_DATA�0 - LGW�5 - Archived�0 - IST Logs2008istlog20090224.txt")
File I/O And Registry :: File System Object Does Not Allow Spaces In File Names
Feb 3, 2010I am working on a VB Console Application that takes an Autocad drawing type DWG and converts it to a PDF using a shell command that calls a third party application. In this case, acmecadconverter.exe from www.dwgtool.com. Then the PDF that is created needs a unique watermark, so I call a second application for that called pdftk.exe from www.accesspdf.com/pdftk/.
Everything works as intended, except when I try file names that contain spaces. The file system object does not tolerate spaces in the drawing file name. For instance, the following command gives me a system.io.filenotfoundexception...
My.Computer.FileSystem.RenameFile("Test Flowchart1.dwg", "Test~Flowchart1.dwg")
It's the same problem for all of my File System commands. Either file not found or invalid arguments.
The complete script I'm using is here:
Code:
Sub Main()
Dim arrArgs() As String = Command.Split(","), _
i As Integer, folderPath As String, myPart As String, _
[Code].....
File I/O And Registry :: Multidimensional Arrays - Save File/Load File?
May 13, 2012I'm currently developing an editor for an AFL management sim.I want to be able to load three or four multidimensional arrays to the program, then save them to the same file. I tried the tutorial on here but got completely muddled up. Why can't it be easy like in VB6 When it was like 10 lines of code tops!
View 5 RepliesFile I/O And Registry :: Random Access File Larger Than Text File?
Jan 7, 2009I am writing a program to calculate Pi to several hundred billion decimal places and this will require lots of GB of memory. I wrote a test program in VB2008 that saved the first 16 digits of Pi (without the decimal point) to both a text file and a random access file, just to be sure it was outputting the numbers properly. For reference the first 16 digits of Pi are:
View 8 RepliesFile I/O And Registry :: VB 2008 Express: Formatting A .txt File Written To A .txt File?
Jan 22, 2009I have a program that can save to a .txt file.The issue is I need it to be done in a tab delimited way.Basically:
TextHere<Tab>TextHere<Tab>TextHere<NextLine>
TextHere<Tab>TextHere<Tab>TextHere<NextLine>
I have this so far, but all it does is put the TextBox1.Text next to TextBox2.Text
Code:
SaveFileDialog1.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"
Dim FileWriter As StreamWriter
Dim results As DialogResult
[code]....
File I/O And Registry :: When Is File Ready For Using - Check Or The File Is Total Copied ?
Dec 6, 2010Our program will start with the help of a FileSystemWatcher object. How can we check or the file is total copied, for example the file is 100 Mbyte it take a time it's ready for use. Idea:
Do While True
Try
N = testForUse(BigFile)
If N = 1 Then Exit Do
[CODE]...
File I/O And Registry :: FileVersionInfo.GetVersionInfo(path) Properties - On Some Paths
Jun 21, 2010Using FileVersionInfo.GetVersionInfo(path), I get what I need most of the time. All the properties are there. But... I have this one folder that most of the properties for this object are NOTHING... except the [Name] property.
[Code]....
File I/O And Registry :: Reading .ini And Showing Settings?
May 6, 2009I want to read 'File.ini' line by line checking if specific text exists in the file and then display on a windows form weather particular settings are turned on or off.So far this code works if "TargetText" exists but if it doenst I get an error on the code line: "If line.Contains("TargetText") Then".
Code:
Using z As System.IO.StreamReader = New System.IO.StreamReader(File.ini")
Dim line As String
' Read first line.
[code]....
It works if "TargetText" exists in a line in the file but if it doesnt exist I get the 'Null Reference Exception. Object reference not set to an instance of an object.'
File I/O And Registry :: Reading Files By First Line
Sep 1, 2008Alright this is what im working with. Im Working with vb.net 2003.I have (X) amount txt files in "C:Marble".In each txt files there are 3 lines.I want to read the first line of each txt file and display them in a listbox. [code] Things i need to Find:
-1 How to tell how many files are in a folder
-2 How to create a loop were it reads the first line of each file in that folder
File I/O And Registry :: Reading From Reg. And Displaying In Listbox
Mar 6, 2010I'm trying to read multiple values from a registry subkey in the CurrentUser key. I need to display these values in a listbox with multiple lines. I so far can only get one of the values from the subkey. I know (or at least I think I know) that I need to list the values in a string (with a possible loop), and then just display the string to the listbox. The subkey is the TypedURLs under CurrentUserSoftwareMicrosoftInternet Explorer Typed URLs. Here is my code I have so far (I did a year of basic VB as part of my Uni course).[code]
View 4 RepliesFile I/O And Registry :: Reading Text From Non-.txt Files
Apr 24, 2009An application that my company uses stores report files with a .dat extension for use with their software. These files can be opened in notepad and the basic report information can be seen as text. I am attempting to write an app that opens and reads data from these .dat files and displays it in a checked listbox. My hangup thus far is that I can't figure out how to read the data from the .dat files since they are not .txt files. Can anyone point me in the right direction?
[Code]...
Reading Custom Properties From An Access File?
Oct 6, 2009I'm trying to build an app that will read custom properties set in an accdb file. Basically, I'm trying to build a Front End updater (Yes I know there are others already built, but they don't work the way I want). The Custom properties are initially set manually by pressing the Office button, going to Manage, then Database Properties and selecting the Custom tab.
I've got most of the code set up, but my sticking point is how to read the custom properties.
Following is the function I use within Access VBA to get the properties, but obviously this is not going to work in VB.Net.
[Code].....
I think I need to replace one or more of the 4 lines after the On Error (yes I know I need to change the Error trapping too). I'm guessing I need to connect to the database file (an accdb, btw) and then go from there to define the container and documents collections.