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.NET Forum / .NET Framework / New Users / January 2006FileSystemWatcher + Monitor Reads/Opens
Hey all, I am looking to use FileSystemWatcher to monitor file access, deletion, creation, and modification. However, I also want to monitor when any user opens / reads this file? Is this possible? Thanks in advance. -- James You should be able to use NotifyFilters.LastAccess to do this.  SignatureHTH, Kevin Spencer Microsoft MVP .Net Developer You can lead a fish to a bicycle, but it takes a very long time, and the bicycle has to *want* to change. > Hey all, > [quoted text clipped - 7 lines] > > -- James Which file system event handler is raised by NotifyFilters.LastAccess then? That would be the "Changed" event.. SignatureHTH, Kevin Spencer Microsoft MVP .Net Developer You can lead a fish to a bicycle, but it takes a very long time, and the bicycle has to *want* to change. > Which file system event handler is raised by NotifyFilters.LastAccess > then? Perhaps I am doing this wrong but CHANGED does not raise an event when the file is opened. Hi James, Without seeing your code, I can't tell you what's going wrong. However, the following MSDN article has a sample that illustrates how to use the notifyFilters Enumeration to specify what sort of changes to watch for. You will note that "LastAccess" is included in the sample: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbts kconfiguringfilesystemwatchercomponentinstances.asp SignatureHTH, Kevin Spencer Microsoft MVP .Net Developer You can lead a fish to a bicycle, but it takes a very long time, and the bicycle has to *want* to change. > Perhaps I am doing this wrong but CHANGED does not raise an event when > the file is opened. My Notify Filters are: LastAccess, LastWrite, FileName, DirectoryName Still CHANGED only seems to be occuring the first time i select a file (select, not open). Successive acceses to this file after that point do not raise a changed event. My code (C++) is basically the same as the msdn sample : http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlr fsystemiofilesystemwatcherclassnotifyfiltertopic.asp except for a few differences in names. Hi James, Interesting. Aside from seeing your actual code, I'm at a loss. I have never tried to use that particular filter. I do know from my research that the LastAccess attribute is not immediately updated on the disk by NTFS, but stored in memory. Perhaps that is the root of the issue. Have you tried waiting? SignatureHTH, Kevin Spencer Microsoft MVP .Net Developer You can lead a fish to a bicycle, but it takes a very long time, and the bicycle has to *want* to change. > My Notify Filters are: LastAccess, LastWrite, FileName, DirectoryName > [quoted text clipped - 7 lines] > > except for a few differences in names. Perhaps we are barking down the wrong path here, getting help up on some functionallity that is just not meant to be. Is there a better way of accomplishing my task? Simply put, I want to monitor ALL file activity on a system (like FileMon from sysinternals). I can from there filter out what I need and react accordingly . However, I am trying to accomplish this without writing a driver (which is how i believe filemon works). Any suggestions? Well, James, if you want to use Windows API to do this, check out: http://msdn.microsoft.com/library/en-us/fileio/fs/obtaining_directory_change_not ifications. SignatureHTH, Kevin Spencer Microsoft MVP .Net Developer You can lead a fish to a bicycle, but it takes a very long time, and the bicycle has to *want* to change. > Perhaps we are barking down the wrong path here, getting help up on > some functionallity that is just not meant to be. Is there a better [quoted text clipped - 5 lines] > > Any suggestions? This looks like it may work. I'll have to write some code to test, but thanks for the pointer. P.S. you may want to add a .ASP on the end of that link so it does not 404. i.e.: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/obtai ning_directory_change_notifications.asp Thanks James. I didn't realize that the "asp" got dropped somehow between my copying and pasting! SignatureKevin Spencer Microsoft MVP .Net Developer You can lead a fish to a bicycle, but it takes a very long time, and the bicycle has to *want* to change. > This looks like it may work. I'll have to write some code to test, but > thanks for the pointer. [quoted text clipped - 4 lines] > i.e.: > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/obtai ning_directory_change_notifications.asp The method(s) seemed promising however i still cannot track the opening of a specific file. I.E. when user X opens file Y i want to know about it immediately. Suggestions? Hi James, I think I mentioned that I had not used the LastAccessed filter before. I may be misunderstanding its use. It only seems to be mentioned in connection with other types of actions that change a file, such as renaming, changing its contents, etc. In any case, I'm not at all sure any more that you can use this to determine whether or not a file has been read only, without changing it. I'm sure that somewhere there is an event that happens which you can capture, but I have scoured the MSDN Library without success trying to find it. How about we back up a bit. What exactly is the situation here? Perhaps there is a parameter of your requirements that can be leveraged in another way. SignatureHTH, Kevin Spencer Microsoft MVP .Net Developer You can lead a fish to a bicycle, but it takes a very long time, and the bicycle has to *want* to change. > The method(s) seemed promising however i still cannot track the opening > of a specific file. > > I.E. when user X opens file Y i want to know about it immediately. > > Suggestions? Simply stated, I want to know (by being signalled, no polling as its way to resource intensive) that a file of my selection has been opened/read, modified in some way, or deleted. The second two are easily done, the first one is not very easy at all. From what I've read i think I'm doomed to driver territory, writing an upper filter driver for the file system. 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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