powershell 使用 AlphaFS 捕获超过 259 个字符的路径名

Question

我的脚本在遇到长路径名（>= 260 个字符）时退出。我如何更改我的 sn-p 以在我的 tif 到 pdf 转换中捕获长路径名。还是简单地将所有文件

SNIPPET：（只要路径名

$tool = 'C:\Program Files\ImageMagick-7.0.1-Q16\magick.exe'
$source = "\\my\path"

Get-ChildItem -Path $source -filter longnames*.tif | %{ & $tool convert "$($_.FullName -Replace ".tif+$", ".tif[0]")" "C:\Data\$($_.Name -Replace ".tif+$", ".pdf")" }

从阅读this blog+posts，看来我需要使用语法

[Alphaleonis.Win32.Filesystem.File]::<some AlphaFS function here?>

但我需要一些与我的申请相关的进一步指导或示例。

我在使用 Powershell v 4 的 Windows Server 2012 R 上安装了 AlphaFS 库。我正在使用 imagemagick 将 PDF 的第一页转换为 TIF。

Answer 1

抱歉，我没有使用 AlphaFS dll 文件，从长远来看，这可能更容易实现，但这里有一个可能的解决方法，使用 robocopy 组合获取长文件名和 subst 临时缩短路径

这利用了这里的函数来进行 robocopy https://github.com/gangstanthony/PowerShell/blob/master/Get-Files.ps1

！警告，未经测试 - 使用风险自负

$tool = 'C:\Program Files\ImageMagick-7.0.1-Q16\magick.exe'

$source = "\\my\path"

# this will load the Get-Files function which uses robocopy
# feel free to check it out before running the script
try{ iex (iwr https://raw.githubusercontent.com/gangstanthony/PowerShell/master/Get-Files.ps1).rawcontent -ea 0 }catch{}

$files = (Get-Files -Path $source -Include longnames*.tif).fullname

# get available drives in case dealing with long file names
# we can map a drive to a long file path so it is short enough for powershell to handle
$drives = [io.driveinfo]::getdrives() | % {$_.name[0]}
$alpha = [char[]](65..90)
$avail = diff $drives $alpha | select -ExpandProperty inputobject
$drive = $avail[0] + ':'

# prepare for write-progress
$index = 0
$total = $files.Count
$starttime = $lasttime = Get-Date

$result = foreach ($file in $files) {
    # this is just the write-progress section
    $index++
    $currtime = (Get-Date) - $starttime
    $avg = $currtime.TotalSeconds / $index
    $last = ((Get-Date) - $lasttime).TotalSeconds
    $left = $total - $index
    $WrPrgParam = @{
        Activity = (
            "imagemagick.exe $(Get-Date -f s)",
            "Total: $($currtime -replace '\..*')",
            "Avg: $('{0:N2}' -f $avg)",
            "Last: $('{0:N2}' -f $last)",
            "ETA: $('{0:N2}' -f (($avg * $left) / 60))",
            "min ($([string](Get-Date).AddSeconds($avg*$left) -replace '^.* '))"
        ) -join ' '
        Status = "$index of $total ($left left) [$('{0:N2}' -f (($index/$total)*100))%]"
        CurrentOperation = "FILE: $file"
        PercentComplete = ($index/$total)*100
    }
    Write-Progress @WrPrgParam
    $lasttime = Get-Date

    # if filename is longer than 240 characters,
    # map a drive to the current path to shorten the filename
    $null = subst $drive /d
    $path, $newfile = ''
    if ($file.length -gt 240) {
        $path = Split-Path $file
        subst $drive $path
        $newfile = Join-Path $drive $(Split-Path $file -Leaf)
    }

    if ($newfile) {
        & $tool convert "$($newfile -Replace '.tif+$', '.tif[0]')" "C:\Data\$($(Split-Path $newfile -Leaf) -Replace '.tif+$', '.pdf')"
    } else {
        & $tool convert "$($file -Replace '.tif+$', '.tif[0]')" "C:\Data\$($(Split-Path $file -Leaf) -Replace '.tif+$', '.pdf')"
    }

    # un-map the drive (whether we mapped it or not, just to be sure)
    $null = subst $drive /d
}

$result