[2008] Parse A Large Text File For Certain Strings
Feb 22, 2009
I am trying to parse a very large text file for certain strings. The text file is part of a level-making software for an old game I play. The text file basically contains all the information the level designer software needs, but the only important bit is the 'texture information'. Basically what I'm trying to create is a little program that parses the text files and shows the user a list of every texture in that text file. The problem is, the strings denoting textures are not really easy to find, and I can't think of any sensible and fast way to get them...
Imagine there is a very large html file with of course lots of html tags. I cannot load the entire file into memory. My intention is to extract all indexes for this <p> and this </p> strings. How should I achieve it?
I'm developing an app for WP7 and Win7 that will get info extracted directly from particular websites. The app will download the HTML source and parse through it to find the required strings. The strings may not have tags. note multiple instances of the string needs to be found. I've tried a few very rudimentary ways, and although they work, they are extremely slow.
I recently had to use my "String converter" to convert 20 lines of text to a single line of "VB .Net String coding". For example:
This is line one This is line two This is line three "with extra stuff"
[Code]...
"This is line one" & vbCrLf & "This is line two" & vbCrLf & "This is line three " & chr(34) & "with extra stuff" & chr(34) & vbCrLf & vbCrLf & "Empty line above me"What is the best way to represent these types of Strings? For example, if you have to display a long message or just a label with information that changes.I was thinking of some sort of text file collection, but it is a little useless to have 100 text files of information of 5-6 lines.
1. Read line-by-line a txt file with more than 500,000 lines, (each line 521 characters long)
2. extract an ID No from the line
3. query from a database for LCCIStatus
4. concatenate the value of LCCIStatus to the line
5. write the line to sample.txt
My problem is, this code works perfectly with the test file of 8000 lines but fail with the actual files which have over 500,000 lines. FYI, the test file contains data which I cut and paste from the actual file.
I need to load a large txt file that is in a fixed width format. There are over 45K lines, so speed is important.I need to load one of the fields into a dropdown box and have another field (label) display the text of another field in the related line.I could import the file to an access db if needed, but would rather not as i also want the txt file to update from a link on a regular bases. So having it in a DB would be more work to process that part.[code]
The intention of the application is to count the percentage of white in a grayscale picture and this is how i think i did this: [Code] Now as the title says i have an issue with the progress bar. As you can imagine, to parse a large picture with thousand, to say, millions of pixels it takes time (about 15-20 secs). The problem is that when click it crashes, so i thought to put a progressbar (even marquee it doesn't mind) to put the user on hold. but i can't think of a good way to do that and the net doesn't help, any good ideas?
I'm currently taking a class in VB 2008, with that said I am working with strings and had a quick question. I need to add code to parse the name when the user enters a name and clicks the Parse Name button, this code should work whether the user enters a first, middle, and last name or just a first and last name, before I get decimated by everyone, I am not asking anyone to do my homework because I already have a working solution to this, my question is to see if there is a "cleaner" or more "efficient" way to code this.
I occasionally have to search a very large text file as a troubleshooting step. The file is continuous text (with spaces between much of the text) but almost everything is date/time stamped. The text is actually messages between two machines so I'd like to insert a line break after every message so that I can follow the protocol exchange. Thre are also a few key words that I'd like to again, separate with a line break.
I occasionally have to search a very large text file as a troubleshooting step. The file is continuous text (with spaces between much of the text) but almost everything is date/time stamped. The text is actually messages between two machines so I'd like to insert a line break after every message so that I can follow the protocol exchange. Thre are also a few key words that I'd like to again, separate with a line break
I am trying to pull out a row of comma seperated fields from a text file. I have a combo box which pulls a product number, and what I want it to do it after you select the item in the combo box it will search through the text file and pull everything in that row?
I am using VB.NET 2005 (if that matters).I need to parse a text (log) file in which to process lines like:
Program Up at: Tue Jun 24 11:32:53.656 2008 - TerrificProgram.exe <some lines here which I ignore> 0.00:24:16 - Emergency Stop! <more lines to ignore> Program Down at: Thu May 29 22:22:56.000 2008
where the 0.0:24:16 is the offset in TimeSpan format (d.hh:mm:ss) relative to the 'Program Up at" datetime.The 'Program Up at: <date/time>' line I successfully detect (in another function which works) and as a result a set a Boolean flag that I am in a valid <Up> - <Down> sequence and I also set a Start-up DateTime var to which to add the offsets later.
The task is to convert the TimeSpan at the beginning of the 'Emergency stop' line to a regular DateTime expression and to write the converted line to another log-file.Simple, isn't it?The function I use for the above purpose is:
Private Function IsTimeSpan(ByRef InputLine As String, ByVal ProgStart As Boolean, ByVal DTofProgStart As DateTime, ByRef NewDateTime As DateTime) Dim iLine As String = InputLine Dim Index As Integer = iLine.IndexOf(" ")
[code]....
What I am doing is I pass each line ('InputLine' parameter) from the original log-file to the function together with the 'in <up>-<down>' flag ('ProgStart' parameter'), the start ot program DateTime (in the 'DTofProgStart') and I want the NewDate to hold the real datetime of Emergency event occurence (not its offset).
What happens is that I successfully detect the lines of interest but the NewDateTime is not updated (though 'ts' is in the correct format and the assignment 'NewDateTime = DTofProgStart' correctly assigns the passed value).Another curious thing is that the line
# TAG NAME = is saved to a file using the code below but when I load that same file back into a RichTextbox Control using additional code below, I get inconsistent results as I try to parse the text. Has anyone else had this problem?'Save the contents of the RichTextBox into the file.richTextBox.SaveFile(saveFile1.FileName, RichTextBoxStreamType.RichText);'Retrieve contents of File into RichTextBox control Dim logData As String logData = System.IO.File.ReadAllText(path + "\" + filenname);
I've been using LINQ so much in the last couple of weeks that when I had to write a one line function to remove < and > from a string, I found that I had written it as a LINQ query: [code] My question is, is it better to do it with LINQ as above or with StringBuilder as I've always done, as below: [code] Both work, the second one is easier to read, but the first one is designed for executing queries against arrays and other enumerables.
I have to parse through a text file that is growing and currently is about 30MB, but it takes a long time for the stream reader to load it before It can loop through the lines. Is there a faster method other than the streamreader?
I'm running into a problem whenever I try to parse a text file by each line. I know I could use stream reader to read line by line but it is a lot easier to simply use split() and I would also like to know the reason why split() doesn't work.
For example, I created a file "test.txt" and filled it with the following text.
text1 text2 text3
then put the following code in the load event of the form (a button click would work the same).
I'm trying to use VB.NET to parse a very large plain text file (2 GB). It is a database and has a field delimiter of SOH and a record delimiter of STX. I want to separate the fields and records of the file.
I would normally read each line of a text file and then use the split function to separate out the fields. I can't use this approach as there isn't always a delimiter on every line.
Is there any way to read a file until STX is found (rather than one line at a time)?
I am a completeBrenner of vb.net using the below code for download stock price from yahoo finance
but it is difficult to add stock symbol always in code,so I want to use a text file and add stock symbol, A Program will read the text file and [code]...
Year 1 mandatory COM137,Mathematics for Computing,20,2 COM140,Computer Technologies,1-2,20 COM147,Introduction to databases,1-2,20 Year 2
[Code]...
in here is where i am having the problem i don't know how to get all the information i need into one specific array element within an array.. i want to get the year and the module status added to the end of an array element
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim StrInput As String = Display.Text Dim firstInteger, secondInteger As Integer firstInteger = StrInput.IndexOf("ad_list_link", 0) secondInteger = StrInput.IndexOf("ad_list_link", firstInteger)
[Code]...
I need to string z from a webpage source file but having trouble cutting the code around it away.
My problem is I have very large text files (approx 2GBs+).They have records in them based in one per line.Each line is not the same length and the data can be different lengths all the time.I am currently reading the file line by line, then splitting the data by common characters in the records. To process the full file it currently takes 3hours. This is way too slow for its purpose.
I've a problem reading text file using StreamReader. The file have between 500 000 and 1 000 000 lines.When I try to read it in a cycle, I get an error. That's why I've tried the StreamReader.ReadToEnd method. It worked fine. I've get the entire contents of the file in one string. So far everything is okay, but I've a small problem searching this huge string. I have to reformat the string to my desired format. I'll try to be more specific: The format of the input file is as follows:
how to parse text and was wondering the best way to do it.[code]I'll need to parse the data after the asterisks and to the last line of text so, I should be getting this:[code]What would be the best way to parse data like this? Would I have to use RegEx? Or could I read the text file line by line and then split the text?
I want to catch the text from an html page.. you know that when you open any html page in the browser, you will see a text but with formatting.. because it's an html code having a lot of tags...
how to get the text from an html page and ignore all formatting and html code?
