filestream

Is there any way to first test if a file is in use before attempting to open it for reading? For example, this block of code will throw an exception if the file is still being written to or is considered in use: try { FileStream stream = new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.Read); } catch (IOException ex) { // ex.Message == "The process cannot access the file 'XYZ' because it is being used by another process." } I've looked all around and the best I can find is to perform some sort of polling with a try catch inside, and that feels so hacky. I would expect there

I suppose my title isn't that clear. I'll try to explain: I can write and read a file using a FileStream FileStream fs = new FileStream("C:\\Users\\Public\\text.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None); private void button1_Click(object sender, EventArgs e) { fs.Seek(0,0); StreamReader sr = new StreamReader(fs); textbox.Text = sr.ReadToEnd(); } private void button2_Click(object sender, EventArgs e) { StreamWriter sw = new StreamWriter(fs); sw.Write(textbox.Text); sw.Flush(); } This way other programs can't use the file, but I also can't delete content. Writing to it

I have the following code in Powershell $filePath = "C:\my\programming\Powershell\output.test.txt" try { $wStream = new-object IO.FileStream $filePath, [System.IO.FileMode]::Append, [IO.FileAccess]::Write, [IO.FileShare]::Read $sWriter = New-Object System.IO.StreamWriter $wStream $sWriter.writeLine("test") } I keep getting error: Cannot convert argument "1", with value: "[IO.FileMode]::Append", for "FileStream" to type "System.IO.FileMode": "Cannot convert value "[IO.FileMode]::Append" to type "System.IO.FileMode" due to invalid enumeration values. Specify one of the following enumeration

FileStream's read/write method can take only integer value as length. But FileStream object returns length in long . In this case, what if file size is larger than integer value (approximate more than 2GB). Then how FileStream's read/write method handle long value. Then you read and write in multiple chunks. The CLR has a limit on the size of any particular object anyway (also around 2GB IIRC, even on a 64-bit CLR), so you couldn't have a byte array big enough for it to be a problem. You should always loop when reading anyway, as you can't guarantee that a Read call will read as many bytes as

I try to use FileStream (using namespace System.IO) but I get an exception : Attempt to access the method failed Here is the code : FileStream fs = new FileStream("file.txt", FileMode.Create); I searched on microsoft.com and I found that this error is because I use a bad library reference. But in my project, I compile with mscorlib.dll from folder : C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\Silverlight\v4.0 I need some help, please. You will need to use IsolatedStorage , for example: Place at the top of your file: using System.IO.IsolatedStorage; Then in your method do

I am building a text editor in Node.js where a user create a file in a textarea. When he is done editing the file, he can push an "export" button that triggers a Jquery function that reads the textarea and post the text on the node.js server. The server should read the information and return a file. I would like to avoid creating a file on the server and servicing it, I'd rather create a file on the fly with streams. I have tried using the following and but that didn't work: exports.exportfile = function(req,res){ var Stream = require('stream') var stream = new Stream(); res.setHeader('Content