NewFile.txt -Append Write-file -file. NewFile.txt -ClearContent Download Write-file Script Repository give it a download and let me know what you think! Updated : i updated this function to allow you to write bytes to a file using Encoding Byte. File Access Demo region Parameters Param ( File 0desktopnewfile. Txt" -f Env:userprofile openAction "Append InputObject this is a test message! Some more stuff to look at ) endregion Parameters region Filesystem Watcher Write-verbose initializing FileSystemWatcher -verbose fileWatcher new-Object leSystemWatcher th 0desktop" -f Env:userprofile) Register-ObjectEvent -InputObject fileWatcher -eventName Created -sourceIdentifier eated -Action Global:t event Write-host file/Folder Created: 0 on 1" -f me, (Split-Path urceeventArgs.
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The full demo code is available at the bottom of this article for your own use. Of course i am not spondylosis just satisfied with showing a demo of using this technique, so i wrote a function that will make it easier to write to a file without tripping something like the fileSystemWatcher or updating the lastAccess and LastWrite timestamps. For lack of a better name, i decided to call it Write-file. Write-file This function behaves just like the examples that I have shown with the exception that you do not have to build the stream each and every time. Plus, this function allows you to clear the contents of a file without alerting or modifying the timestamp. As shown before, any changes, including clearing out the content of a file will modify the lastWrite timestamp and if using FileSystemWatcher, will trip it much like the image below shows. Another nice feature of this function is that you do not have to give the full path of the file. As long as the file is in the same directory, it will auto-build the full path that is required to make the stream connection. Lets check out a couple of demos of the function to show how it will not update the current timestamp of 2/14/2013 10:00PM. "This is a test" Write-file -file testfile. Txt "This is a test for appending data" Write-file -file.
So with that, lets go ahead and make the same updates, but this time i will throw in the setFileTime method to prevent both the fileSystemWatcher from catching this and stop the last* timestamps from being updated. Txt" -f Env:userprofile) fileStream new-Object reamWriter -ArgumentList (le:Open(file Open out-Null tLength(0) fileStream. ose write-verbose "Sleep 5 seconds" Start-Sleep -seconds 5 Get-Item file select fileStream new-Object reamWriter -ArgumentList (le:Open(file Append out-Null First write a new line so the append isn't on the same line fileStream. ose write-verbose "Sleep 5 seconds" Start-Sleep -seconds 5 Get-Item file select get-Content file As with the previous example, i cleared out the existing file and added my own information to it and then came back again and appended some more data. Not once did the fileSystemWatcher catch this action and even the last* timestamps did not get updated. I am sure there are several things that you can apply this technique to such as just reading a file without updating the lastAccessTime or maybe even writing to a new file covertly. Whatever advantages the reason is, this technique is sure to help you out. In fact, i would love to hear what uses you have for this technique!
Txt" -f Env:userprofile) fileStream new-Object reamWriter -ArgumentList (le:Open(file Open tLength(0) fileStream. Write This is a test! ose write-verbose "Sleep 5 seconds" Start-Sleep -seconds 5 Get-Item file select fileStream new-Object reamWriter -ArgumentList (le:Open(file Append First write a new line so the append isn't on the same line fileStream. Write This is another test test! ose write-verbose "Sleep 5 seconds" Start-Sleep -seconds 5 Get-Item file select get-Content file endregion Create Initial File As you can see, nothing got past the fileSystemWatcher and also both of the timestamps were updated each time we accessed and update the file. Whether i appended data to it or overwrote the file, it was caught any issue. Even more interesting is that using SetLength(0) to essentially clear the file actually made the fileSystemWatcher trip two times!
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You might remember me showing this off in a previous article and how it tracks everything from a file creation, to a modification and even the deletion of a file or files in a given directory. This, along with showing the lastAccess and LastWrite timestamps should provide some nice examples of using this Win32 api and how I can bypass both of these. region Filesystem Watcher, write-verbose initializing FileSystemWatcher -verbose fileWatcher new-Object leSystemWatcher th "C:usersAdministratordesktop". Register-ObjectEvent -InputObject fileWatcher -eventName Created -sourceIdentifier eated -Action Global:t event business Write-host file/Folder Created: 0 on 1" -f me, (Split-Path urceeventArgs. FullPath) -backgroundColor Black -foregroundColor cyan. Out-Null, register-ObjectEvent -InputObject fileWatcher -eventName deleted -sourceIdentifier leted -Action Global:t event Write-host file/Folder Deleted: 0 on 1" -f me, (Split-Path urceeventArgs.
Out-Null, register-ObjectEvent -InputObject fileWatcher -eventName Changed -sourceIdentifier anged -Action Global:t event Write-host file/Folder Changed: 0 on 1" -f me, (Split-Path urceeventArgs. Out-Null endregion Filesystem Watcher, with that out of the way, i can continue to move forward with my examples. To prove that this subscription is actually working, i will go ahead and create a file on my desktop. Txt" -f Env:userprofile) fileStream new-Object reamWriter -ArgumentList file ose get-Item file select yep, it is working like a champ. It picked up on the file that I created without any issues. First i am going to write to the file, then append some more data to the file and we can watch the filesystemwatcher to pick it up and also check out the last* timestamps to see if they change. region Create Initial File file 0desktopnewfile.
There are a lot of constructors available when using this class: tConstructors format-Table @ l"reamWriter Constructors". GetParameters forEach "0 1" -f. ToString -split " ) -join. For my examples, i will am going to use the ream Stream parameter. If I wanted to mess with the Encoding (I wont use it for this article i would work with the system.
Text.Encoding type and specify the type of encoding that I would use to write to the file with some other encoding. In order to get the Stream, i will be using le with the Open static method to open up a stream to an existing file. Le:Open, i will use the string Path and leMode mode and specify either Open to over write the file or Append to append to the file. It is important to note that by specifying Open, it does not actually overwrite the entire file, it only starts at the beginning of the file and overwrites the text up to the point that the new text ends. To make this a true overwriting of the file, i will call the setLength method and specify a 0 to tell the file to be 0 bytes and clear the file prior to adding new text. Kick Off the fileSystemWatcher, before i start to make my edits on a file, i am going kick off the filesystemwatcher subscription to monitor the location where i will be making all of the changes to a file.
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Int64filetimeunchanged 0xffffffff, lets go ahead and load this signature up into my current console session. SetFileTime add-Type -name fileTime -memberDefinition signature -passThru setFileTime gm -static. With this now loaded up, we can now take a look as to how in the world can we get the handle of assignments a file in order to call this method. Connecting to a file, this method works best when we connect thesis to a file and then immediately call the method using the handle of the associated connection to the open file. This tells the file system to not write to the attributes for the lastAccess/LastWrite times. Getting the handle of a file is not as hard as it seems. For this I will make use of the reamWriter class to connect to an existing file to either append to the existing file, overwrite the file with something new or completely erase all content from the file. We will also be able to access the handle required later on for the setFileTime method by using the.
I just have to pre-pend the third line with sri Public to ensure that the method will be available when I call this signature using Add-Type. In order for this to work properly, i have to encase the signature in a here-string. Signature dllImport kernel32.dll setLastError true) return: MarshalAs(ol) public static extern bool SetFileTime(IntPtr hFile, ref long lpCreationTime, ref long lpLastAccessTime, ref long lpLastWriteTime simple enough, now for something that required a little more work. The setFileTime method requires 4 parameters in order for it to work properly. The handle piece i will get into a little later and the CreationTime is a non-issue (meaning I will supply null to it). This just leaves the lastAccess/LastWrite parameters to deal with. Reading up on the msdn documentation, i can find that if I pass the value of 0xffffffff, the file system operations will be prevented from writing to their respected attributes. I could choose one or the other to prevent, or in the case of my examples, i chose to block both of these attributes from being modified.
lastAccessTime (Disabled by default on Vista and above oss) using fsutil and reboot the systems. Fsutil behavior set DisableLastAccess 0, once all that was done, we found that during a test scan of a couple of folders, that the lastAccessTime attribute was being updated. Thus during this research I came across a win32 api method called SetFileTime, that if passed the correct arguments, would actually tell the file system operations to ignore updating the lastAccessTime as well as the lastWriteTime attributes of a given file! SetFileTime method, finding this method took a little bit of time and research by sifting through everyones favorite site for win32 apis:. This is an amazing repository of everything Win32 and how to properly build the api calls using the signatures provided. Between this and some google (or bing) searches, i was able to isolate what I needed by using the setFileTime method under kernel32. Px/tFileTime px, i want to use the C signature (as shown in the picture above) to modify and throw into my powerShell code. For the most part, everything is already set.
How do i get it to write to the xml file? Settingsxmldoc new ync false; readSettingsXML; if (favorites. Length 0) for (i 0; i favorites. Length; i) var newElement eateElement db eateTextNode(favoritesi ve settings. By : retrolisthesis tcables, answers, within a gadget, a partially qualified file name evaluates to the x-gadget protocol. Activexobject s don't know anything about this protocol, so they don't know where to put the file and they throw an error. Use a fully qualified file name and it should work fine: th "settings. Xml by : Andy earnshaw). This little trick was something I stumbled upon while attempting to help solve an issue with a file scan that was about to take place.
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