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3. File Does Not Exist Java

This post explains how to delete files using Powershell command ‘Remove-Item’. We can delete a file using remove-item command as below. Open powershell prompt and execute the command. Remove-item file-path Example: PS C: Remove-Item C: test testFile.txt PS C: We can delete as many files as we want with single. Description: At least one schema in the TABLEFILTER does not exist. Cause: The TABLEFITER specified contains a schema that does not exist. Action: Retry the job specifying only schemas that exist.

Contents of this article

• The problem
• The solution
• Validate the path does not contain Illegal characters
• Validate the path exists
• Validate the file extension
• Conclusion

Typically, you might accept path parameters to your function as follows:

For instance, if your script prompts for a folder path, and the user enters something unexpected, your script won't be able to perform your intended task. In the example below, the script can't create the folder if the user enters illegal characters for folder names.

1234567functionInvoke-Task{param([string]$Path)}$Path=Read-Host-Prompt'Enter the folder path'New-Item$Path-type directoryAccepting user input without validation can cause problems

The best practice is to anticipate what type of file path we expect the user to pass. We can then validate that before executing any code that could possibly make unexpected changes to the system.

The solution ^

Let's begin by asking some questions about the path we expect:

• Should the path always point to a file or always be a folder—or do we take both?
• Should the file or folder exist or not?
• If it is always going to be a file and not a folder, what kind of file extensions are we looking for?
• If we are creating files/folders, how do we validate no illegal characters are in the path?

Dragon age origins cheats ps3. Now that we have the basic questions hopefully answered for the type of path we expect for the argument, we can now begin to write validation attributes for our parameter. Validation attributes are attributes you can add to parameters when writing a PowerShell function (for an excellent introduction see this 4sysops blog post by Adam Bertram).

Of the eight available validation attributes, the most useful for this use case would be the ValidateScript parameter. This will also allow us to return helpful error messages to the user in case the path did not pass validation.

Below I will explain how you can validate parameters in PowerShell with or without the help of validate scripts.

Validate the path does not contain Illegal characters ^

We don't need any validate scripts for this task. The .NET class System.IO.FileInfo will take care of this task for us.

1234567891011121314PSC:>Invoke-Task-PathC:UsersInvoke-Task:Cannot process argument transformation on parameter'Path'.Cannot convert value'CC:Users'totype'System.IO.FileInfo'.Error:'The givenpath's format is not supported.'At line:1char:19+Invoke-Task-Path CC:Users+~~~~~~~~~+CategoryInfo:InvalidData:(:)[Invoke-Task],ParameterBindingArgumentTransformationException+FullyQualifiedErrorId:ParameterArgumentTransformationError,Invoke-Task

Validate the path exists ^

We can do this relatively simply using Test-Path. You can also easily reverse this to validate that a file or folder does not exist.

1234567891011functionInvoke-Task{param([ValidateScript({if(-Not($_ Test-Path)){throw'File or folder does not exist'}return$true})][System.IO.FileInfo]$Path)}

If passing a folder or file that does not exist as an argument, you will receive this error message:

12345678910111213PSC:>Invoke-Task-PathC:FolderThatDoesNotExistInvoke-Task:Cannot validate argument on parameter'Path'.File orfolder does notexistAt line:1char:19+Invoke-Task-PathC:FolderThatDoesNotExist+~~~~~~~~~~~~~~~~~~~~~~~~~+CategoryInfo:InvalidData:(:)[Invoke-Task],ParameterBindingValidationException+FullyQualifiedErrorId:ParameterArgumentValidationError,Invoke-Task

Validate the path exists and is a file or a folder

We can use the PathType parameter of the Test-Path cmdlet to verify the path is either a leaf (file) or container (folder) type. It is also helpful to perform each test separately so the error returned remains very specific.

1234567891011121314functionInvoke-Task{param([ValidateScript({if(-Not($_ Test-Path)){throw'File or folder does not exist'}if(-Not($_ Test-Path-PathType Leaf)){throw'The Path argument must be a file. Folder paths are not allowed.'}return$true})][System.IO.FileInfo]$Path)}

And this is how the error message looks:

12345678910111213PSC:>Invoke-Task-PathC:UsersInvoke-Task:Cannot validate argument on parameter'Path'.The Path argument must beafile.Folder paths are notallowed.At line:1char:19+Invoke-Task-PathC:Users+~~~~~~~~+CategoryInfo:InvalidData:(:)[Invoke-Task],ParameterBindingValidationException+FullyQualifiedErrorId:ParameterArgumentValidationError,Invoke-Task

Validate the file extension ^

If you have researched a little bit into the validation parameters, you may know already that we can use the ValidatePattern attribute to accomplish this task easily. However, ValidateScript allows us to display a more descriptive error message.

1234567891011121314151617functionInvoke-Task{param([ValidateScript({if(-Not($_ Test-Path)){throw'File or folder does not exist'}if(-Not($_ Test-Path-PathType Leaf)){throw'The Path argument must be a file. Folder paths are not allowed.'}if($_-notmatch'(.msi .exe)'){throw'The file specified in the path argument must be either of type msi or exe'}return$true})][System.IO.FileInfo]$Path)}

If the filename does not have the required extension, you will see this error message:

12345678910111213PSC:>Invoke-Task-PathC:Usersdesktop.iniInvoke-Task:Cannot validate argument on parameter'Path'.The file specified inthe path argument must be either of type msi orexeAt line:1char:19+Invoke-Task-PathC:Usersdesktop.ini+~~~~~~~

Comodo File System Filter Does Not Exist In America

~~~~~~~~~~~~~+CategoryInfo:InvalidData:(:)[Invoke-Task]

Sas File Does Not Exist

,ParameterBindingValidationException+FullyQualifiedErrorId:ParameterArgumentValidationError,Invoke-Task

Conclusion ^

Validating file and folder paths is essential because otherwise your PowerShell script might produce unexpected and unwanted results. You can use built-in PowerShell features to validate user input, or you can write a validate script.

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File Does Not Exist Java

Use Windows Admin Center with PowerShell

For some reason, my FileSystemWatcher is not firing any events whatsoever. I want to know any time a new file is created, deleted or renamed in my directory. _myFolderPath is being set correctly, I have checked.

Here is my current code:

gwin003gwin003

4 Answers

You seem to be creating the FileSystemWatcher as a local variable in the setup method. This will of course go out of scope at the end of the method and may well be getting tidied up at that point, thus removing the watches.

Try creating the FSW at a point where it will be persisted (eg a program level variable) and see if that sorts you out.

ChrisChris

My problem was that I expected certain actions to cause the FileSystemWatcherChanged event to fire. For example, moving a file (clicking and dragging) from the desktop to the watched location did not raise an event but copying an existing file and pasting a new copy of it (there by creating a new file to the file system and not simply moving an existing one) caused the Changed event to be raised.

My solution was to add every NotifyFilter to my FileSystemWatcher. This way I am notified in all cases where the FileSystemWatcher is able to notify me.

NOTE that it isn't entirely intuitive/obvious as to which filters will notify you for specific cases. For example, I expected that if I included FileName that I would be notified of any changes to an existing file's name..instead Attributes seem to handle that case.

MoMoMoMo

We just had a very similar problem, where moving a folder did not trigger the expected events. The solution was to hard copy the entire folder, rather than just moving it.

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