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.NET Forum / Languages / C# / January 2008Access to file
Hi, I have the following situation: -> app1 writes data to a file -> app2 (a service) is notified when the file is changed using the FileSystemWatcher -> app2 reads the last added data and should remove the read data from the file Well, I think I can get a problem, if app1 tries to write data to the file, while app2 is removing the content from the file at the same time. How can this problem be solved? Christian Hi, Can you use some other mechanism than a file? Otherwise, can you create separated files each time App1 has something to write (App2 can delete the consumed files afterwards)  SignatureIgnacio Machin http://www.laceupsolutions.com Mobile & warehouse Solutions. > Hi, > [quoted text clipped - 11 lines] > this problem be solved? > Christian For this very reason, when you try and write to a file the operating system will lock the file preventing other applications from using it. I think you can use the FileSystemMonitor to tell you when this lock is removed. Then you know when it is safe to try and write to it. The other way to do it is to ensure that only app1 actually writes to the file. You could do this by having another file written to by app2 telling app1 what data needs to be deleted. Thanks for your help. Is the file locked if I only read from it, too? Christian > For this very reason, when you try and write to a file the operating > system will lock the file preventing other applications from using it. [quoted text clipped - 4 lines] > the file. You could do this by having another file written to by app2 > telling app1 what data needs to be deleted. The file lock allows multiple readers but only one writer. When the file is locked for writing only that application may write or read from the file. When a file is locked for reading any application can read from that file and no application can write to it. Thanks Olie :-) > The file lock allows multiple readers but only one writer. > [quoted text clipped - 3 lines] > When a file is locked for reading any application can read from that > file and no application can write to it. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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