file/folder is already in use, renaming,deletion problem ? c# iis - c#

I am trying to renme a file/folder, when i try to rename a file, i got an error, file is already in use, it is just my guess that it is caused by w3wp.exe iis process? some time its says, access to the path is denied, although the file does exist, and there are no special permission, i have all the permission to copy/delete/move and everything for the file/folder.
How to fix this problem.
the folder contains jpeg files.
this happen: when i copy a file then try to rename it.
this happen: when i rename a file then try to delete it.
what i mean to say is that it happen when i already use a file operation then for second time it gives me this error :(
this is the error:
The process cannot access the file 'C:\images\audio-aif-old.png' because it is being used by another process.
file.move(source,destination);
i am using C#. iis 6, asp.net.

Directly , ans is no. But you can delete old copy and create a new copy. See this. http://www.aspnettutorials.com/tutorials/file/file-renfile-aspnet2-csharp.aspx

Some other program must relinquish the file. If you've written a program that's still running then that must be shut down. If the file is currently open for writing you must also ensure that it's been appropriately closed. Try creating another file and see if you have the same problem with that one.

Related

Split PDF and save but Access is denied [duplicate]

I have read a similar post, but i just cant figure out the problem.
I have changed the windows permissions and changed routes.
When i try to save a file it throws me the exception:
Access to the path **** denied.
string route="D:\\";
FileStream fs = new FileStream(route, FileMode.Create); <--here is the problem
StreamWriter write = new StreamWriter(fs);
patient person = new patient();
patient.name = textBox1.Text;
patient.name2 = textBox2.Text;
You are trying to create a FileStream object for a directory (folder). Specify a file name (e.g. #"D:\test.txt") and the error will go away.
By the way, I would suggest that you use the StreamWriter constructor that takes an Encoding as its second parameter, because otherwise you might be in for an unpleasant surprise when trying to read the saved file later (using StreamReader).
Did you try specifing some file name?
eg:
string route="D:\\somefilename.txt";
tl;dr version: Make sure you are not trying to open a file marked in the file system as Read-Only in Read/Write mode.
I have come across this error in my travels trying to read in an XML file.
I have found that in some circumstances (detailed below) this error would be generated for a file even though the path and file name are correct.
File details:
The path and file name are valid, the file exists
Both the service account and the logged in user have Full Control permissions to the file and the full path
The file is marked as Read-Only
It is running on Windows Server 2008 R2
The path to the file was using local drive letters, not UNC path
When trying to read the file programmatically, the following behavior was observed while running the exact same code:
When running as the logged in user, the file is read with no error
When running as the service account, trying to read the file generates the Access Is Denied error with no details
In order to fix this, I had to change the method call from the default (Opening as RW) to opening the file as RO. Once I made that one change, it stopped throwing an error.
I had this issue for longer than I would like to admit.
I simply just needed to run VS as an administrator, rookie mistake on my part...
Hope this helps someone <3
If your problem persist with all those answers, try to change the file attribute to:
File.SetAttributes(yourfile, FileAttributes.Normal);
You do not have permissions to access the file.
Please be sure whether you can access the file in that drive.
string route= #"E:\Sample.text";
FileStream fs = new FileStream(route, FileMode.Create);
You have to provide the file name to create.
Please try this, now you can create.
TLDR : On my end, it had something to do with AVAST ! => Whitelist your application.
All of a sudden, I also got this UnauthorizedAccessException problem in the windows WPF program I'm writing. None of the solutions worked - except I couldn't figure out how to elevate my application to full privileges (not using VS) while at the same time, being already on the administrator account, I didn't feel the need to dig that deep in permission concerns.
The files are image files (jpg, psd, webp, etc.) I wasn't trying to open/write a directory, it has always been a valid path to a file, and I needed to write to the file, FileAccess.ReadWrite was inevitable. The files (and any of their parent directory) were not readonly (I even checked by code prior calling new FileStream(path, mode, access, share) via FileInfo.IsReadOnly) - so what happenned all of a sudden ???
Thinking about : I had an had drive crash, so I unpacked a backup of my solution code from another drive. In the meantime, I added codes in my application to PInvoke APIs to directly read hard drive sectors physical bytes as well as USB plug/unplug monitoring.
I started to get the Exception when I added those, but even though I temporarly removed the related codes from the application, I still got the UnauthorizedAccessException.
Then I remembered one thing I've done long ago, a painstaking similar issue where I wanted my application to communicate sensible data via Wifi, which was to add the executable among AVAST exceptions, and the assembly directory aswell (My app was already among the authorized apps through firewall)
Just did it for my application in AVAST settings, AND THE EXCEPTION IS GONE !!! Two whole days I'm lurking StackOverflow and the web to get moving on, FINALLY !
Details : I can't pinpoint exactly what AVAST didn't like in my application as the only changes I made :
Retrieved then launched the backup code - it worked like a charm, files (images) opens/write without problems (3 days ago)
Added USB detection (3 days ago - Just tested the code, didn't tried to open an image)
Added PInvoke physical drive direct read (2 days ago - FileStream, and the logic to define where/how to scan the damaged drive - Just tested the code, didn't tried to open an image)
Added image format detection starting from Jpg/Jfif.. 2 days ago, got the exception upon testing the code.
While searching for solutions, added an Image Gallery WPF UserControl to diplay pictures based on their signature and check which files gives the exception : almost all of them (some files opens/write okay - why ???)
Tried everything I've found on SO (since the last 2 days) until I opened AVAST settings and whitelist my application.
... now I can move on into adding a bunch of file signatures to retrieve as many datas as I could.
If this may help those who like me, aren't failing on the "I'm passing a directory path instead that of a file", yet, have no time to learn exactly why antiviruses think our own code is a malware.
Just Using the below worked for me on OSX.
var path = "TempForTest";

File.ReadAllBytes keeps file handle open

I have this piece of code, which loads a file into RAM, then loads it as an assembly into an AppDomain (d):
var a = d.Load(File.ReadAllBytes(tmp));
The problem is that when I later try to delete the file located at tmp (right now just using File Explorer), I get an error saying that the file is still open in my program. I even tried using the using keyword with File.Open, and that didn't seem to work either. Can someone please explain why this might be happening, and how to fix it?
ReadAllBytes is supposed to close the file as part of its function. It sounds like something is preventing it from closing, and therefore you cannot delete. Maybe there's an exception happening that needs to be caught.
Here is a similar question with a solution which may be helpful:
Unable to delete some files via System.IO.File in C# console app

FolderWatcher.Created fires, but file doesn't exist- NAS

I'm facing a very weird problem.
I have a C# project with a FolderWatcher.OnCreate on a specific LAN path.
FolderWatcher.Created += new FileSystemEventHandler(FSW_Created);
I'm working simultaneously with two systems on the NAS so when one system finishes to work - it "tells" the other by copying a file (File.Copy) to some location.
The second system is listening to that location (don't ask why that's the way of implementing that...it's a long story)
When the copy of the original file is created - the second system searches for the original copy.
This works for all these file, except of sometimes when I get a message that the original's directory doesn't exist...
I see the directory is correct, and it happens only for a few such files. It has to exist (and it actually exists) because the copy came from there....
If anyone has a clue - I'll be glad.
when the error happens I enter into the following code line:
if (!Directory.Exists(directoryPath))
Currently I just added a path - try 50 times, every second, until you find it... I can't check it now, but I guess it will work
Thanks

How can I delete a file that is in use by another process?

When I try to delete a file occurs the following exception:
The process cannot access the file ''
because it is being used by another
process.
My code looks like:
string[] files = Directory.GetFiles(#"C:\SEDocumentConverter\SOURCE");
foreach (string file in files)
{
File.Delete(file);
}
How can I solve this problem?
There is no way to delete a file that's currently being used by another process. You have to close whatever program has that file open first, before you can delete it.
If you don't already know which program that is, you can figure it out using Handle or Process Explorer.
You can P/Invoke the Windows MoveFileEx function, and use the MOVEFILE_DELAY_UNTIL_REBOOT flag, with a NULL destination name. This will delete the file when you reboot.
If the file is being used you're out of luck in trying to delete it. I can't tell you based on your code what process might be using the file(s), but try looking here or here or here, or at any of the other questions that show up as related to this one for guidance regarding this issue, and by all means follow the guidance from #Cody Gray about using Process Explorer.
slightly off topic: But it seems from your code that you are trying to delete all files of your folder.
Well instead of deleting them one by one we have another method Directory.Delete(path, True) which will delete the directory as contained in the string named path. Then you may recreate the directory if you want. But your problem may persist here too.
Another way is to find all open handles to the file and close them forcibly.
Works nice for you, bad for any apps which were using the file.
Could try that in UI with SysInternals ProcessExplorer.
Just rename this file. This will do the thing for whoever tries to write to that location.
Notes:
1) Of course the file is not deleted physically yet. Nice to do the MoveFileEx trick mentioned here around to complete the job.
2) If you want to delete a locked file to write smth new in its place (e.g. during build), just rename the file to a GUID name. If you need the folder to be clean, either use an ignored extension / hidden attribute, or rename the file to a path under %TEMP% (if on the same drive).
3) Not all locked files can be renamed, but it works for me for like 90% practical applications. You can move a file without affecting an open read/write/execute handle, it will continue working with the moved file just good (if moved within the same NTFS volume of course).
4) That's what Windows Installer would basically do before it asks you to please reboot somewhen soon: move the file away from your eyes, schedule to be removed upon reboot. Usually the newly-installed app can be used right away.
Practical Use:
My favorite is with MSBuild. Overriding the <Copy/> task with this stuff makes all the build go linux-way. You don't care if a prev version is still running somewhere, can still build&run. The old app keeps using the old version of the files. The new app loads the newly-written version.
Might be moving to %TEMP% if on the same drive (not my case though). I'd just rename them to an extension which is ignored with the current source control client.

Need to find a way to programmatically delete undeleteable empty folders

I've got a large folder on an offsite backup machine that gets populated with files by rsync (through deltacopy) every night (running windows xp) from the main work site. I've discovered some annoying folders that cannot be opened, or deleted, or even checked for file sizes. I get the such and such a folder is not accessible, access is denied message when I try to click on it in windows explorer. According to the windows explorer tooltip they are also "empty" and the properties of these folders say 0 bytes and 0 files.
I currently have a C# program that goes through every folder and file and tries to copy the whole backup directory to a dated backup-backup directory, which is how i discovered this problem in the first place. The regular System.IO library seems helpless against these blasted folders. Exceptions are thrown when I even try to access the folder path.
Does anyone have any clue how I could, say, on an access denied exception in my existing copy code, force the delete of these folders so rysnc can recreate the directory again and get the whole thing synced again?
First thing I think of when I see this is time to do a checkdisk. From the sounds of it, it feels more like a file system problem than something solvable the way you want to go about it.
Yes, try the awesome "Process Explorer" from Microsoft (formerly SysInternals).
Although it's for the processes in the windows filesystem, you could search for your folder in the explorer window & it will tell you who is locking it.
Once you release the process, your program would be able to delete the folder.
If that doesn't work, see if you can specify additional parameters to bruteforce the delete in your program.
It sounds like the filenames are either bad or contain characters that are invalid in Win32. Did you try to delete the directories with rd /r? Did you do a dir /x on them and try to delete the files/directories using their short names?
I would say that you first have to figure out why you can't delete the folders. Once you figure that out, you can write a program to fix it.
OK, so now that you know it's a permissions problem, the first step is to take ownership of the files (so you can set the permissions), then change the permissions so that you can delete the files.
Here's code to take ownership of a file:
WindowsIdentity currentUser = System.Security.Principal.WindowsIdentity.GetCurrent();
FileSecurity acl = File.GetAccessControl(filename);
acl.SetOwner(currentUser.User);
File.SetAccessControl(filename, security);
The trouble was that SYSTEM owned these files. I set deltacopy to run as administrator so that administrator would own the files deltacopy makes.
I guess windows is doing its job. The permissions are airtight. But if this happens again someday where I'd have to grab ownership from some other user to the current user (who has administrator permissions) how would I do that in code?
A question for another day I suppose. Thanks again everyone.

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