关闭.NET打开的文件句柄 [英] Close a file handle opened by .NET

问题描述

我正在研究一个脚本，用于根据EXIF数据重命名文件.

I'm working on a script to rename files based on EXIF data.

param([string]$path)

# http://blogs.technet.com/b/jamesone/archive/2007/07/13/exploring-photographic-exif-data-using-powershell-of-course.aspx
[reflection.assembly]::loadfile( "C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Drawing.dll") | out-null

function MakeString { 
    $s=""
    for ($i=0 ; $i -le $args[0].value.length; $i ++) {
        $s = $s + [char]$args[0].value[$i]
    }
    return $s
}

$files = Get-ChildItem -Path $path
foreach ($file in $files) {
    if ($file.Extension -ne ".jpg") { continue }
    if ($file.Name -match "^(\d+)-(\d+)-(\d+)") { continue }
    $exif = New-Object -TypeName system.drawing.bitmap -ArgumentList $file.FullName
    $captureDate = MakeString $exif.GetPropertyItem(36867)
    $captureDate = ($captureDate -replace ":", '-').Substring(0,19)
    $newFilename = $captureDate + " " + $file.Name.Trim()
    $file.Name + " -> " + $newFilename
    $file |Rename-Item -NewName $newFilename
}

从EXIF读取日期没问题，但是当我尝试重命名文件时，出现以下错误消息:

Reading the date from EXIF is no problem, but when I try to rename the file I get this error message:

Rename-Item : The process cannot access the file because it is being used by another process.
At D:\Norwegen\RenamePhotos.ps1:25 char:12
+     $file |Rename-Item -NewName $newFilename
+            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (D:\Norwegen\P1270465 (1920x1433).jpg:String) [Rename-Item], IOException
    + FullyQualifiedErrorId : RenameItemIOError,Microsoft.PowerShell.Commands.RenameItemCommand

当我监视ProcMon中的目录时，我可以看到文件已关闭很晚:

When I monitor the directory in ProcMon I can see that the files are closed rather late:

(请查看突出显示的行，它来自当前正在处理的文件条目中间的一个较早的文件)

(look at the highlighted line, it's from an earlier file in the middle of the entries from the file currently being processed)

那么，如何关闭文件(可能仍会从EXIF读取中打开文件)以便重命名?

So, how can I close the file (which is probably still open from the EXIF read) so I can rename it?

我已经尝试关闭打开的文件:

What I already tried to close the open file:

Remove-Variable exif
$file.Close()

推荐答案

由于仅从文件中读取内容，因此调用Dispose()应该可以解决问题.例

Since you only read from the the file, then a call to Dispose() should do the trick. Ex.

    foreach ($file in $files) {
    if ($file.Extension -ne ".jpg") { continue }
    if ($file.Name -match "^(\d+)-(\d+)-(\d+)") { continue }
    $exif = New-Object -TypeName system.drawing.bitmap -ArgumentList $file.FullName
    $captureDate = MakeString $exif.GetPropertyItem(36867)

    #Disposing object as soon as possible
    $exif.Dispose()

    $captureDate = ($captureDate -replace ":", '-').Substring(0,19)
    $newFilename = $captureDate + " " + $file.Name.Trim()
    $file.Name + " -> " + $newFilename
    $file |Rename-Item -NewName $newFilename
}

这篇关于关闭.NET打开的文件句柄的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！