file-locking

Is is possible to open a text file and read the contents while another application is updating the file, in such a way that it does not cause a lock conflict? I need to monitor a log file from one application which is updated by another application each time an event occurs. I do check if the file is in use before I try to read it, but that does not seem to work in all cases. Thanks, Pieter it depends on how the first app open that file. i.e when calling CreateFile API to open a file, there is dwShareMode param which tells the api how to open it (if this was given 0, it can't be accessed from

I would like to add user friendly file locking to a software running under Windows (Windows 7 mostly), written in C# . I already achieved the file locking part, by keeping the files in use "open" in the corresponding process. What I now still would like to add is recognition of the user who has a file currently open/locked. The files being accessed lie on a mapped network drive , used by different users on different computers. When a file is locked and a second person tries to open the file, he should be confronted with a dialog, similar to the "File in use"-dialog from the Microsoft Office

Is there a way in .Net to find out exactly which process has locked a file? EDIT : I'm doing this because I want to let my user know that they can't modify/open the file, because at the moment, another program they're using (such as Excel) has it open. Hopefully, this helps. The short answer to this is no. However, the long answer is that there are various API calls and WMI methods that you can use to find this information out, but don't expect it to be quick and simple. If you want to use API calls, take a look at the NtQuerySystemInformation function with the SYSTEM_PROCESS_INFORMATION

I've got a form that writes its input to a textfile. Would it be possible to lock a text file for editing, and perhaps give a friendly message "the file is edited by another user, please try again later." I'd like to avoid conflicts if the file has multiple editors at the same time. Here's how the entry is currently added. $content = file_get_contents("./file.csv"); $fh = fopen("./file.csv", "w"); fwrite($fh, $date_yy . '-' . $date_mm . '-' . $date_dd . '|' . $address . '|' . $person . '|' . $time_hh . ':' . $time_mm); fwrite($fh, "\n" . $content); fclose($fh); Any thoughts? You can use flock(

I have a windows service that writes out log file entries to an XML log file. I maintain a handle to the log file while the service is operational, and close, flush and dispose of it when the service is stopped. The file write operations are by the service only, and I have the filestream open in FileAccess.ReadWrite while sharing is set to FileShare.Read. I would like to be able to open and view this file with an XmlRead() call by another application, but I get an error stating the file is being used by another process. I had read another post on this and was under the impression this was