Question

需要一些PowerShell脚本的帮助，该脚本会监视文件夹以创建扩展名为.csv的新文件检测到创建新文件时，会执行以下操作...

文件的详细信息将发送到日志文件
该文件的副本将发送到名为“1_ToBeProcessed \ MyImport.csv”的另一个文件夹（注意该文件已重命名为MyImport.csv）
将文件移至“\ MYSERVER \ MYCOMPANY \ MYFOLDER \ MyHistory”目录（原始文件名）
调用表达式来运行.bat文件，该文件将获取位于“\ MYSERVER \ MYCOMPANY \ MYFOLDER \ 1_ToBeProcessed”中的文件，并将该文件导入应用程序。
然后，脚本会休眠60秒，以便在处理下一个文件之前完成导入。除非在脚本运行时创建另一个文件，否则此脚本都可以正常工作同一类型的多个文件可能同时命中监视文件夹。因此，脚本可以循环遍历五个文件，然后另一个文件可以进入目录。当发生这种情况时，似乎脚本重新开始并开始循环遍历文件......但它会一遍又一遍地循环相同的文件。我希望有人可以指出我正确的方向，我在这个脚本上做错了什么。由于添加了新文件，如何让它在重新启动之前完成当前循环中正在处理的文件？我们将非常感谢您提供的任何帮助！

这就是我现在所拥有的......

#Define watcher; Set path to watch; Set filter on file type
$filewatcher = New-Object System.IO.FileSystemWatcher
$filewatcher.Path = "\\MYSERVER\MYCOMPANY\MYFOLDER"
$filewatcher.Filter = "*.csv"                     

#Define "move to" and "copy to" paths
$moveTo = "\\MYSERVER\MYCOMPANY\MYFOLDER\MyHistory"
$copyTo = "\\MYSERVER\MYCOMPANY\MYFOLDER\1_ToBeProcessed\MyImport.csv"


#Define actions after an Event is Detected
$action = {$files = Get-ChildItem -Path $filewatcher.Path -Filter filewatcher.Filter 
        foreach ($file in $files)
        {
        #Define variables for log file
        $changeType = $Event.SourceEventArgs.ChangeType
        $logline = "$(Get-Date), $changeType, $file"
        #Actions to take
        Add-Content "\\MYSERVER\MYCOMPANY\MYFOLDER\3_Log\MyImportLog.txt" -value $logline
        Copy-Item $file.FullName -Destination $copyTo
        Move-Item $file.FullName -Destination $moveTo -Force
        Invoke-Expression "& '\\MYSERVER\MYCOMPANY\MYFOLDER\4_Scripts\PSscriptToRunBATfile.ps1'"
        #Pause the script for 60 seconds to allow it to finish posting the import before going to the next record
        Start-Sleep -Seconds 60
        }
        }

#Decide which events should be watched and set check frequency 
$onCreated = Register-ObjectEvent -InputObject $filewatcher -EventName "Created" -SourceIdentifier FileCreated -Action $action

Answer 1

我建议不要循环，而是在创建/更改文件时处理它们。也许如果你有很多文件开头，你可以：

（a）首先循环（仅一次循环）。然后启用文件观察程序，以便在此之后对文件进行更改。

（b）启用文件观察器，使用FileChanged＆amp; FileCreated，然后“触摸”所有文件以触发您的代码。

# based on the script by By BigTeddy 05 September 2011
# simplified by Andy Myatt, to use one script block
# https://gallery.technet.microsoft.com/scriptcenter/Powershell-FileSystemWatche-dfd7084b

param(
    [string]$folderToWatch = "D:\Temp"
  , [string]$filter        = "*.*"
  , [string]$logFile       = "D:\Temp\Temp2\filewatcher.log"
)

# In the following line, you can change 'IncludeSubdirectories to $true if required.
$fsw = New-Object IO.FileSystemWatcher $folderToWatch, $filter -Property @{IncludeSubdirectories = $false;NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'}

# This script block is used/called by all 3 events and:
# appends the event to a log file, as well as reporting the event back to the console
$scriptBlock = {

  # REPLACE THIS SECTION WITH YOUR PROCESSING CODE
  $logFile = $event.MessageData # message data is how we pass in an argument to the event script block
  $name = $Event.SourceEventArgs.Name
  $changeType = $Event.SourceEventArgs.ChangeType
  $timeStamp = $Event.TimeGenerated
  Write-Host "$timeStamp|$changeType|'$name'" -fore green
  Out-File -FilePath $logFile -Append -InputObject "$timeStamp|$changeType|'$name'"
  # REPLACE THIS SECTION WITH YOUR PROCESSING CODE

}

# Here, all three events are registered.  You need only subscribe to events that you need:
Register-ObjectEvent $fsw Created -SourceIdentifier FileCreated -MessageData $logFile -Action $scriptBlock
Register-ObjectEvent $fsw Deleted -SourceIdentifier FileDeleted -MessageData $logFile -Action $scriptBlock
Register-ObjectEvent $fsw Changed -SourceIdentifier FileChanged -MessageData $logFile -Action $scriptBlock

# To stop the monitoring, run the following commands:
#  Unregister-Event FileDeleted  ;  Unregister-Event FileCreated  ;  Unregister-Event FileChanged


#This script uses the .NET FileSystemWatcher class to monitor file events in folder(s).
#The advantage of this method over using WMI eventing is that this can monitor sub-folders.
#The -Action parameter can contain any valid Powershell commands.
#The script can be set to a wildcard filter, and IncludeSubdirectories can be changed to $true.
#You need not subscribe to all three types of event.  All three are shown for example.

Answer 2

我认为您可能会遇到某种文件锁定问题，但如果不知道PSscriptToRunBATfile.ps1文件中的内容，则很难说清楚。

您的filewatcher将在NotifyEvents的默认LastWrite | FileName | DirectoryName上触发，并在此时循环目录。但是，您的get-childitem命令不一定按照复制它们的顺序返回文件。

更好的解决方案是让您根据$Event对象执行操作并更改PS1文件，将导致事件的文件作为输入参数：

$action = {$file = $Event.SourceEventArgs.FullPath
  #Define variables for log file
  $changeType = $Event.SourceEventArgs.ChangeType
  $logline = "$(Get-Date), $changeType, $file"
  #Actions to take
  Add-Content "\\MYSERVER\MYCOMPANY\MYFOLDER\3_Log\MyImportLog.txt" -value $logline
  Copy-Item $file -Destination $copyTo
  Move-Item $file -Destination $moveTo -Force
  Invoke-Expression "& '\\MYSERVER\MYCOMPANY\MYFOLDER\4_Scripts\PSscriptToRunBATfile.ps1' -InputFile $file"
}

注意：您可能希望将InternalBufferSize提高到默认值8k以上，这样您就不会错过任何更改：

    $filewatcher.InternalBufferSize = 32kb

使用System.IO.FileSystemWatcher

2 个答案: