Parsing/Loading A Large File With Unique Characters?
Feb 17, 2012
I am attempting to make an application that can load in a large file that has some unique characters in it. A majority of the file is plain text, and ultimately I need to replace specified values with other values.The file is an InstallShield .ILG file - I am trying to have a small executable modify the "Feature" GUID entered in the file so that future installations/upgrades identify the new type of features it has. It's a fix for some software issues that would really expedite the solve without having someone un-install and re-install the package each time.
The problem is regardless of the methods I've tried to load the file, it doesn't bring over the data. It's a unique file that I do not want to modify/parse any data in other then those specific fields. Anytime I attempt to convert it to string I just get a few characters that are blocks. I've attempted all types of loading methods within VB but it continues to fail.
I've gotten this utility to modify everything from the config files to the proper DLLs it needs to load and the registry it needs to change. But it's this one piece that regardless of my attempts I can't find a way to load and modify the ILG file.
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Dec 27, 2010
I have one large XML file from one of our vendor and I am trying to pars it using Linq but it looks some wrong logic I am using.
This is xml file:
HTML
<Psw xmlns="http://localhost">
<exid>20</exid>
<Mes><Me>
<doc><ps>
<ghder> .....
The code I am trying:
Dim doc As XDocument
doc = XDocument.Load(TextBox1.Text)
Dim qList = (From xe In doc.Descendants.Elements("ghder") _
Select New With { _
.mid = xe.Element("MId").Value, _
.cdate = xe.Element("cD").Value _
' As well I need to get the value for pn child attribute }).FirstOrDefault
MsgBox(qList.mid)
Error for DBNull ' Object reference not set to an instance of an object.
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May 9, 2011
With the shape of really large characters such as numbers and alphabetic characters + others, is there a way to get that shape as a REGION please?Imagine a really fat snake forming the letter S or two rectangles placed together to form a large letter L or a T like the shapes in TETRIS.
1) Does anyone know of anything in VB.Net that can translate such shapes into a System. Drawing.Region or know of a project elsewhere that achieves this please?
2) While I'm on the subject, how would you SCALE UP / DOWN a System.Drawing.Region please? How would you work out the Transform Matrix required please?
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Feb 25, 2009
the best method to read a huge file? I'm guessing its with "stream"?It's like a 200mb file.I need to read each line and do something if the line contains a search string.
Code:Imports System.IO
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim strFile As String = "c:
[code].....
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Nov 23, 2011
I'm busy with an applicaton which reads space delimited log files ranging from 5mb to 1gb+ in size, then stores this information to a MySQL database for later use when printing reports based upon the information contained in the files. The methods I've tried / found work but are very slow.
or is there a better way to handle very large text files?
I've tried using textfieldparser as follows:
Using parser As New TextFieldParser("C:logfiles estfile.txt")
parser.TextFieldType = FieldType.Delimited
parser.CommentTokens = New String() {"#"}
[Code].....
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Mar 16, 2009
i m trying to generate a large random block of characters(lets say 100 characters).This below is the code i used to generate a letter but to generate lots of characters(letters) i couldn't.I then wish to display them in a RichTextBox:::
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim rand As New Random
Dim letter As String
letter = ChrW(rand.Next(Asc("A"), Asc("Z") + 1))
TextBox1.Text = letter
End Sub
End Class
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Sep 5, 2009
Is it possible to create a kinda virtual storage in a vb application so that data created during run time are stored right in the applicaion instead of its environment?
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Sep 1, 2011
ive a dictionary database with table having 32000 entries... ive bound it to the listbox(using binding source and dataset)... but when the program starts it hangs for 1-2 minutes in the beginning..
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Nov 10, 2010
I have a task to resolve, it is regading extracting characters from a long string to the console, the extracted text shall be reformatted and saved into a CSV file. The string comes out of a database.
It looks something like: UNH+RAM6957+ORDERS:D:96A:UN:EGC103'BGM+38G::ZEW+REQEST6957+9'DTM+Z05:0:805'DTM+137:20100930154
The values are seperated by '.I can query the database and display the string on the console, but now I need to extract the Keyword 'ORDERS' for example, and lets say it's following 5 Characters. So the output should look like: ORDERS:D:96A then I need to extract the keyword 'BGM' and its following five characters so the output should look like: BGM+38G:After extracting all the keywords, the result should be comma seperated and look like:
ORDERS:D:96A,BGM+38G: it should be saved into a CSV file automatically.
I tried already:
'Lookup for containing KeyWords
Dim FoundPosition1 = p_EDI.Contains("ORDERS")
Console.WriteLine(FoundPosition1)
Which gives the starting position of the Keyword.I tried to trim the whole thing around the keyword "DTM". The EDI variable holds the entire string from the Database:
Dim FoundPosition2 = EDI
FoundPosition2 = Trim(Mid(EDI, InStr(EDI, "DTM")))
Console.WriteLine(FoundPosition2)
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Feb 8, 2012
I'm trying to load this image file on a PictureBox but I get an "OutOfMemoryException was unhandled" error.
How do I allocate more memory for this? Or maybe use another container? My project's main feature is loading maps, unfortunately my boss wants to load the whole map and won't accept sliced version of the map.
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Jul 10, 2010
I'm fairly new to VB.NET, and I'm working on a text editor with a tabbed interface. I deal with large text files. Should I have each tab / text document open up in a new thread or a process? I basically want the entire application to always run fast as the text editor is just one part of it. If I have several large text files open I don't want the rest of the application slowing down a bit.
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Feb 13, 2012
I am using VB .Net to access the eBay API and store all completed orders in a database. This database is then fed into a proprietary shipping system, which can not handle an order number larger than 20 characters. eBay returns an order number like so 230407279314-680141236013 which is too long. The order number is always 12 numbers a hyphen and 12 more numbers. What I need to do, is turn this (the result can be alpha numerical) into a shorter, unique order key to store in my database alongside the true orderId (so that this can be referenced by the shipping software instead of the actual order number). The reason for the 20 character limit is the barcode algorithm used. Is there any way to achieve this in VB .Net 2010? This number can be anything unique, so long as it does not exist already (even a good uniqueid function would work, but I would have to query the database to make sure it isn't taken)
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Jan 10, 2009
I'm using the datagridview. This is the sample data:
[Code]....
How do I parse through the grid to rename the duplicate values in a particular column (in this example it's the l_name field) into such a format?
[Code]....
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Mar 21, 2011
How generate the unique no. 1,2,3 and so on .... on button click of each new user ..
the code mentioned below is a readwrite coding in vb.net ...
but the problem is it generate the same id for different users on button click event... but i want the no. of times button clicked the new ids will be generated
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim FILE_NAME As String = Server.MapPath("counts.vbi")
[Code].....
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Apr 4, 2012
Language: vb.net
File size: 1GB, and stuff.
Encoding of the text file: UTF8 (so each character is represented by different numbers of bytes).
Collation: UnicodeCI (when several characters are essentially the same, the most popular version will be the one unique.). I think I know how to handle t his one.
Because each character is represented by different numbers of bytes and each line has different numbers of characters, the number of bytes in each line also vary.
I suppose we have to compute hash for each line. We also need to store buffers location where the line each. Then we have to compare buffers. Then we will check whether the same line shows up or not.
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Mar 5, 2009
I would like to be able to parse vb.net code files, so I can examine the collection of Subs, Functions (and their contents, including comments), private variables, etc. I can be open the actual source code files. So for example, if I have:
[Code]....
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May 8, 2011
Unique constraint - these columns currently doesn't have unique values..?? I have created Unique Constraint with 3 columns. My code works perfectly but once - two users @ same time entered same data and somehow it saved in DB; after that incident. This UniqueConstraint gives me error - These columns currently doesn't have unique values. How can I check if user enters this kind of entry or how can I restrict the Entry?
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Mar 16, 2011
I'm creating a vb.net winforms application that will take in user given strings, parse them, and print out labels with variable information. The given string will be used in all the labels, but the variable part of the string will change with each label.
My question is: is it better to parse the strings one time, then store those values in arrays, or to parse the string each time a label is printed? Which will perform better? Which is better practice? What is the proper way to test something like this?
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Jun 9, 2011
I want to write a program to do Markov chain, but my states are quite large. First of all I calculate all the transition probabilities and revenues for all states(1381860 total states), and store in a multidimensional array. Public RevArr(0 To 9, 0 To 750, 0 To 282) As Long
After that the iteration of markov chain should use these as inputs to calculate the steady-state probabilities. But when I try to run the main code I got this error.Exception of type 'System.OutOfMemoryException' was thrown.
The following is the declaration of second array I add just another dimension for storing all the iterations, but I get this error. Dim stateprob(IT + 1, 0 To 9, 0 To 750, 0 To 282) As single
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Jun 30, 2010
we are trying to use google to get exchange rate prices. they use a csv file which we get the code to go out and get.what im trying to do is pick the first line of the file and just use that. i have the following code but its not just picking the one line.
[Code]...
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Jan 26, 2012
I am trying to create a program in VB.net to help me fix broken computer systems by parsing log files. I have some ideas but I have only built simple programs previously. I have ideas how to do this but so far my attempts haven't gone so well.Specifically I can either import a txt type file or copy and paste the contents of a txt file into the program and then have it compare what has been posted to a good/bad list then it reprints out what is bad in color coding. Also if their is a way to update the file it uses for comparison by entering in a txt file that would be stellar.
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Aug 26, 2011
this code takes about 30 mins and high cpu usage, what is the problem
Do
strLine = objReader.ReadLine()
If strLine Is Nothing Then
[code].....
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Jul 15, 2011
I have a dirty csv file that has 13 headers, but sometimes misses the last column value on some lines.
If the line has 12 columns, I would like to add ,0 as the 13th column.
Example:
2006/03/09,30403,7820,68,220,538,1956,14,3765,11384,26676,17932
2007/12/20,40796,13393,33,79,427,2604,11,4042,24974,44583,41561,7688
How can I read the file, and add ,0 to a line that only has 11 comma's and leave the lines alone when they have 12 comma's?
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Aug 17, 2009
I have a complicated text file that has 10000 lines of text which is of the format
$$ ************************************
$$ Put FIXTURE alignment code below
$$ you are in Manual mode at this point
$$ ************************************
[code]....
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May 1, 2009
I'm toying with an idea that would require me to parse a text file that contains a SQL statement. (i.e. Select * From Customers) I would like to be able to programmatically via Visual Basic identify key words, table names, comment lines, etc.So, how do compilers handle such a task? How does a SQL database handle such a task? All of the parsing tools are for CSV files with some sort of consistent delimiter. I'm wondering if I need to read the file one character at a time and then do some sort of comparison.
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Mar 28, 2009
I need to code a hitcounter button that looks at a textfile,counts how many times a site has been visited and then shows a message box with the results
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Jun 24, 2009
I have a scenario where i have to Parse a UTF-16 Encoded CSV file and populate a treeview using VB.Net. I need to parse the CSV files which may also support other languages. how to proceed on this and what classes of .net I can use to solve this issue.
In VB.Net we do not have a provision to parse a UTF-16 file But There is a provision for reading UTF-8 encoded file.The method is OpenText(). I want a similar method but it should parse or read a UTF-16 encoded file.
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Mar 4, 2011
I'm using vb.net. sample data below.. Can i use regular expression to parse this kind of data?
ID:="000000877978" LOCATION:="ALASKA" TELEPHONE:="8979797890" AGE:="33"
ID:="080832108089" LOCATION:="ASIA" TELEPHONE:="088238780" AGE:=45 BIRTHDAY="04/19/1968"
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Feb 23, 2010
So i have a SQL file with this sort of data :
[Code]....
p.s. If i am not able to make my self clear here then do ask me for my code , It works perfectly but causes the application hang and is pretty slow ( Using the StreamReader )
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Oct 25, 2008
I'm in the process of parsing the RTF file format, all was going well until I got to the body part of it.
Quote:
This part has been done
{
tf1ansiansicpg1252deff0deflang2057{fonttbl{f0fswissfcharset 0 Arial;}{f1fswissfprq1fcharset0 Arial Black;}}
[Code].....
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