使用 PowerShell 和 System.IO.FileSystemWatcher 检测特定文件夹的下载何时完成

Question

试试这个。我修改了原版以添加更多逻辑。不确定这个版本是否可靠。让我知道它是否可靠。

# create an array that tracks each file
$global:files = @()
# where we will move the file once it is free
$destination = "C:\destination"

$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = "C:\source"
$watcher.Filter = "*.*"
$watcher.IncludeSubdirectories = $true
$watcher.EnableRaisingEvents = $true  

$action = {
    $path = $Event.SourceEventArgs.FullPath
    $changeType = $Event.SourceEventArgs.ChangeType
    $logline = "$(Get-Date -f o), $changeType, $path"
    Add-content "C:\log.txt" -value $logline
    Write-Host $logline

    if($changeType -eq "Renamed" -and $path.Split(".")[-1] -ne "crdownload") {
        Write-Host -ForegroundColor Green "Found the file we need! $path"
        Add-content "C:\log.txt" -value "Found the file we need! $path"
        $global:files += $path
    }
}    

Register-ObjectEvent $watcher "Created" -Action $action
Register-ObjectEvent $watcher "Changed" -Action $action
Register-ObjectEvent $watcher "Deleted" -Action $action
Register-ObjectEvent $watcher "Renamed" -Action $action

while ($true) {

    # if there are any files to process, check if they are locked
    if($global:files) {

        $global:files | % {

            $file = $_
            # assume the file is locked
            $fileFree = $false

            Write-Host -ForegroundColor Yellow "Checking if the file is locked... ($file)"
            Add-content "C:\log.txt" -value "Checking if the file is locked... ($_)"

            # true  = file is free
            # false = file is locked
            try {
                [IO.File]::OpenWrite($file).close();Write-Host -ForegroundColor Green "File is free! ($file)"
                Add-content "C:\log.txt" -value "File is free! ($file)"
                $fileFree = $true
            }
            catch {
                Write-Host -ForegroundColor Red "File is Locked ($file)"
                Add-content "C:\log.txt" -value "File is Locked ($file)"
            }

            if($fileFree) {

                # do what we want with the file, since it is free
                Move-Item $file $destination
                Write-Host -ForegroundColor Green "Moving file ($file)"
                Add-content "C:\log.txt" -value "Moving file ($file)"

                # make sure we don't progress until the file has finished moving
                while(Test-Path $file) {
                    Sleep 1
                }

                # remove the current file from the array
                Write-Host -ForegroundColor Green "Done processing this file. ($file)"
                Add-content "C:\log.txt" -value "Done processing this file. ($file)"
                $global:files = $global:files | ? { $_ -ne $file }
            }

        }
    }

    sleep 2
}

这将监听Renamed文件扩展名不是“crdownload”的事件，帮助我们获取实际路径/文件/扩展名，而不是临时文件的信息。找到匹配项后，它会存储在数组中，这样我们就可以同时处理多个文件。
一旦数组包含一个或多个文件名，就会检查每个文件，看它当前是否被锁定或是否空闲。如果空闲，则将其移动到$destination。您可以将所需操作从更改Move-Item为您想要的任何操作。
一旦文件移动成功，它将从阵列中删除。

要知道，你所看到的多个Changed事件将是预期的（从 Chrome 下载时也会出现这种情况）：

常见的文件系统操作可能会引发多个事件。例如，当文件从一个目录移动到另一个目录时，可能会引发多个 OnChanged 事件以及一些 OnCreated 和 OnDeleted 事件。移动文件是一项复杂的操作，由多个简单操作组成，因此会引发多个事件。同样，某些应用程序（例如防病毒软件）可能会引发 FileSystemWatcher 检测到的其他文件系统事件。

您可能想要删除添加的Write-Host行。您可能还想在终止捕获中添加以下内容，以正常终止已注册的事件：

Get-EventSubscriber | ? { $_.EventName -in "Created","Changed","Deleted","Renamed" } | Unregister-Event

灵感。

检查文件是否被锁定。

Answer 1

试试这个。我修改了原版以添加更多逻辑。不确定这个版本是否可靠。让我知道它是否可靠。

# create an array that tracks each file
$global:files = @()
# where we will move the file once it is free
$destination = "C:\destination"

$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = "C:\source"
$watcher.Filter = "*.*"
$watcher.IncludeSubdirectories = $true
$watcher.EnableRaisingEvents = $true  

$action = {
    $path = $Event.SourceEventArgs.FullPath
    $changeType = $Event.SourceEventArgs.ChangeType
    $logline = "$(Get-Date -f o), $changeType, $path"
    Add-content "C:\log.txt" -value $logline
    Write-Host $logline

    if($changeType -eq "Renamed" -and $path.Split(".")[-1] -ne "crdownload") {
        Write-Host -ForegroundColor Green "Found the file we need! $path"
        Add-content "C:\log.txt" -value "Found the file we need! $path"
        $global:files += $path
    }
}    

Register-ObjectEvent $watcher "Created" -Action $action
Register-ObjectEvent $watcher "Changed" -Action $action
Register-ObjectEvent $watcher "Deleted" -Action $action
Register-ObjectEvent $watcher "Renamed" -Action $action

while ($true) {

    # if there are any files to process, check if they are locked
    if($global:files) {

        $global:files | % {

            $file = $_
            # assume the file is locked
            $fileFree = $false

            Write-Host -ForegroundColor Yellow "Checking if the file is locked... ($file)"
            Add-content "C:\log.txt" -value "Checking if the file is locked... ($_)"

            # true  = file is free
            # false = file is locked
            try {
                [IO.File]::OpenWrite($file).close();Write-Host -ForegroundColor Green "File is free! ($file)"
                Add-content "C:\log.txt" -value "File is free! ($file)"
                $fileFree = $true
            }
            catch {
                Write-Host -ForegroundColor Red "File is Locked ($file)"
                Add-content "C:\log.txt" -value "File is Locked ($file)"
            }

            if($fileFree) {

                # do what we want with the file, since it is free
                Move-Item $file $destination
                Write-Host -ForegroundColor Green "Moving file ($file)"
                Add-content "C:\log.txt" -value "Moving file ($file)"

                # make sure we don't progress until the file has finished moving
                while(Test-Path $file) {
                    Sleep 1
                }

                # remove the current file from the array
                Write-Host -ForegroundColor Green "Done processing this file. ($file)"
                Add-content "C:\log.txt" -value "Done processing this file. ($file)"
                $global:files = $global:files | ? { $_ -ne $file }
            }

        }
    }

    sleep 2
}

这将监听Renamed文件扩展名不是“crdownload”的事件，帮助我们获取实际路径/文件/扩展名，而不是临时文件的信息。找到匹配项后，它会存储在数组中，这样我们就可以同时处理多个文件。
一旦数组包含一个或多个文件名，就会检查每个文件，看它当前是否被锁定或是否空闲。如果空闲，则将其移动到$destination。您可以将所需操作从更改Move-Item为您想要的任何操作。
一旦文件移动成功，它将从阵列中删除。

要知道，你所看到的多个Changed事件将是预期的（从 Chrome 下载时也会出现这种情况）：

常见的文件系统操作可能会引发多个事件。例如，当文件从一个目录移动到另一个目录时，可能会引发多个 OnChanged 事件以及一些 OnCreated 和 OnDeleted 事件。移动文件是一项复杂的操作，由多个简单操作组成，因此会引发多个事件。同样，某些应用程序（例如防病毒软件）可能会引发 FileSystemWatcher 检测到的其他文件系统事件。

您可能想要删除添加的Write-Host行。您可能还想在终止捕获中添加以下内容，以正常终止已注册的事件：

Get-EventSubscriber | ? { $_.EventName -in "Created","Changed","Deleted","Renamed" } | Unregister-Event

灵感。

检查文件是否被锁定。

使用 PowerShell 和 System.IO.FileSystemWatcher 检测特定文件夹的下载何时完成

答案1

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