2024 C# read file while being written

C# read file while being written

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August undefined, 2024

WebNov 6, 2012 · 1 I think you need to use something like this: FileStream fs = new FileStream (fileName, FileMode.Open, FileAccess.Read, System.IO.FileShare.ReadWrite). Note the FileShare mode. – alfoks Nov 6, 2012 at 11:31 As is stackoverflow.com/questions/3560651/… – Alex K. Nov 6, 2012 at 11:35

Reading file while another process is writing to it. - C / C++

WebTo simulate it (if you want to do so using code) simply make a new project, open the text file using a var reader = new StreamReader (fileLocation) and then loop forever using a while (true) loop. The file is opened in your reader stream and never closed, making it locked. – Nicholas Ellingson Aug 6, 2015 at 20:09 Show 5 more comments Your Answer WebJan 28, 2024 · The program takes 1 parameter from the user; i.e., the file to read. using System; using System.IO; class FileRead { string filereadbuf; // buffer to store the content … cuit logistica ambiental mediterranea sa

c# - How to copy a file while it

WebJul 1, 2024 · To read a text file in C#, you will use a StreamReader object. In this tutorial, you will learn how to use StreamReader to read the … WebApr 23, 2008 · The easiest thing to do is to use a lock file. A writer tries to open the lock file and if it does not exists, creates the lock file. A reader then opens the lock file and because it opens, it means the data file is locked so the reader goes away or waits. The writer deletes the lock file after the write operation is complete. WebJun 26, 2012 · If you need to be able to read a file while it's being rewritten, then you can make the writer make a transient copy of the file, modify that, then copy it back to the original file. This the way rsync does this, for instance. There are a number of ways to implement this, but no free lunch. Each method has its own shortcomings and … margarita nograles

c# - Reading a File While Being Written to by Another …

java - reading a file while it

WebSep 24, 2010 · If the file is written in some other encoding (like UTF-8 or other Unicode encoding), It's possible that the bytes won't convert correctly to characters. You'll have to handle that by determining the encoding if you think this will be a problem. Search Stack overflow for info about determining a file's text encoding. WebApr 11, 2016 · using (FileStream logFileStream = new FileStream (@"c:\test.txt", FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) { using (StreamReader logFileReader = new StreamReader (logFileStream)) { string text = logFileReader.ReadToEnd (); // Your code.. } } Share Improve this answer Follow edited … cuitla vega biografiaWebThis FileShare mode could have been read, write, both, delete, all of these, or none. You have to specify the very same FileShare mode that the other application specified. If the other application allowed only reading, use FileShare.Read; if it allowed both reading and writing, use FileShare.ReadWrite. cuitla vega musica

"WebSep 14, 2010 · using (FileStream stream = File.Open ("path to file", FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) { using (StreamReader reader = new StreamReader (stream)) { while (!reader.EndOfStream) { } } } The FileAccess specifies what YOU want to do with the file. " - C# read file while being written

C# read file while being written

c# - How can I read a file even when getting an "in use by …

WebWhen the file is writing in binary (byte by byte),create FileStream and above solutions Not working,because file is ready and wrotted in every bytes,so in this Situation you need other workaround like this: Do this when file created or you want to start processing on file WebMay 7, 2013 · FileShare.Write or FileShare.ReadWrite should allow the other process (subject to permissions) to open and write to the file while you are reading it, however you'll have to watch for the file changing underneath you while you read it - simply buffering the contents upon opening may help here. ... C# - Can't upload a file to FTP server while ...

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WebMar 17, 2012 · 152. If notepad can read the file then so can you, clearly the program didn't put a read lock on the file. The problem you're running into is that StreamReader will open the file with FileShare.Read. Which denies write access. That can't work, the … WebApr 24, 2015 · For watching writes to the file, the FileSystemWatcher class is the right way to go. However if you want to know if a file is being written, what I would do is get a list of all the open files by process, and monitor when the file is opened and then closed. There is a CodeProject article that shows how to get the open files by process here.

WebApr 24, 2015 · FileShare.ReadWrite is not neccesary, and is likely undeseriable, it will allow other applications to Read and Write your file while you are using it. Generally FileShare.None is preferred when writing to a file, to prevent others from accessing a file while you work on it. – ScottS Apr 8, 2009 at 4:56 WebSep 30, 2016 · //Request access ReaderWriterLockSlim fileLock = null; bool needCreate = false; lock (Coordination.Instance) { if (Coordination.Instance.ContainsKey (theId)) { fileLock = Coordination.Instance [theId]; } else if (!fileExists (theId)) //check if the file exists at this moment { Coordination.Instance [theId] = fileLock = new ReaderWriterLockSlim …

WebDec 28, 2012 · What you need to do is to implement your own line buffering. When you get an EOF you wait until the file grows some more and then resume reading the line. Alternatively, if you are using Java 7 or later, the file watcher APIs allow you to watch for file writes without polling the file's size. WebDec 17, 2014 · You can have a readonly reader on a file that is being written to. The only 'asynch' part you need to get involved with, is handling threads to prevent the GUI from …

WebFor example this solution works when: open 2 windows folders, copy file from Dir a to watched dir. This solutions gives me correctly a single event call on FileFinishedCopying. Other solutions like opening the file/reading the file still give multiple hits in this scenario. Thank you verry mutch for this solution! –

WebNov 10, 2016 · The code which populates the XML file is accessed with using (var fs = new FileStream (filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.Read)) { var xmlDoc = XDocument.Load (fs); foreach (...) { // add the element to xmlDoc xmlDoc.Save (filePath); } } And the code which reads the file in order to count the number of elements margarita nolasco santiagoWebDec 31, 2014 · If you constructed the StreamWriter by passing a path you can use myStream.BaseStream.Length to determine the file's size. If you constructed the StreamWriter by passing a stream to it, then you already have access to that stream's Length property. :) No need for the FileInfo or calculating the length when you can query … margarita nicolasWebJul 8, 2013 · To be able to read the file while it's being written, it must have been created with dwShareMode = FILE_SHARE_READ. You may have to ditch CopyFileEx and implement it yourself using CreateFile / ReadFile / WriteFile. For async reading/writing you can use the lpOverlapped parameter of ReadFile / WriteFile functions. Share Improve … cuit morelli srlWebYou just need a StreamReader, but make sure to set the FileShare attributes appropriately when you both Write to the file, and Read from the file. You can have a readonly reader on a file that is being written to. The only 'asynch' part you need to get involved with, is handling threads to prevent the GUI from locking up. cuit meridional segurosWebApr 4, 2013 · If you want read this file by another program, the another program should close FileStream FileStream fs1 = new FileStream (file, FileMode.OpenOrCreate, FileAccess.Write); fs1.write () // fs1 writes file fs1.closer (); // if you don't closer , the another program can not open this file If this is helpful { Please Mark as Answered } cuitlacoche usoWebOct 23, 2013 · I finaly managed to solve my problem, but not exactly the way you were thinking about. My solution works in two steps : 1: Enable the streaming transport in the WCF service 2: Use a custom stream implementation with an overload of the read method that, if the end of file has been reached, waits a few milliseconds and retries the read to … cuit monsanto argentina srlWebAug 1, 2007 · Only if the writing and reading applications are cooperating. The key. would be to make sure that the file is opened by both applications with. appropriate sharing and modes, and to periodically attempt to read from. the file (every second or so, for example...don't do it too often, otherwise you'll kill performance). cuitochette def