PowerShell用位元組陣列讀寫壓縮檔案

我正在重新撰寫一個適用于檔案的 PowerShell 腳本。我在這里使用了兩個功能

無需匯入和匯出檔案即可展開存檔

并且可以成功地讀寫檔案到存檔。我已經發布了整個程式，以防萬一有人幫助我更清楚。

但是，存在三個問題（除了我真的不知道自己在做什么的事實之外）。

1.) 大多數檔案在嘗試運行時都會出現此錯誤 Add-ZipEntry -ZipFilePath ($OriginalArchivePath $PartFileDirectoryName) -EntryPath $entry.FullName -Content $fileBytes}

無法將值“507”轉換為型別“System.Byte”。錯誤：“對于無符號位元組，值太大或太小。” （用位元組陣列中的任何數字替換 507）

2.) 當它讀取一個檔案并將其添加到 zip 存檔 (*.imscc) 時，它會在檔案內容的開頭添加一個字符“a”。

3.）唯一不會出錯的檔案是文本檔案，當我真的希望它處理任何檔案時

感謝您的任何幫助！

更新：我嘗試使用 System.IO.BinaryWriter，但錯誤相同。

Add-Type -AssemblyName 'System.Windows.Forms'
Add-Type -AssemblyName 'System.IO.Compression'
Add-Type -AssemblyName 'System.IO.Compression.FileSystem'

function Folder-SuffixGenerator($SplitFileCounter)
{
    return ' (' $usrSuffix ' ' $SplitFileCounter ')'
}

function Get-ZipEntryContent(#returns the bytes of the first matching entry 
  [string] $ZipFilePath, #optional - specify a ZipStream or path 
  [IO.Stream] $ZipStream = (New-Object IO.FileStream($ZipFilePath, [IO.FileMode]::Open)),
  [string] $EntryPath){
    $ZipArchive = New-Object IO.Compression.ZipArchive($ZipStream, [IO.Compression.ZipArchiveMode]::Read)
    $buf = New-Object byte[] (0) #return an empty byte array if not found
    $ZipArchive.GetEntry($EntryPath) | ?{$_} | %{ #GetEntry returns first matching entry or null if there is no match
        $buf = New-Object byte[] ($_.Length)
        Write-Verbose "     reading: $($_.Name)"
        $_.Open().Read($buf,0,$buf.Length)
    }
    $ZipArchive.Dispose()
    $ZipStream.Close()
    $ZipStream.Dispose()
    return ,$buf 
}


function Add-ZipEntry(#Adds an entry to the $ZipStream. Sample call: Add-ZipEntry -ZipFilePath "$PSScriptRoot\temp.zip" -EntryPath Test.xml -Content ([text.encoding]::UTF8.GetBytes("Testing"))
  [string] $ZipFilePath, #optional - specify a ZipStream or path 
  [IO.Stream] $ZipStream = (New-Object IO.FileStream($ZipFilePath, [IO.FileMode]::OpenOrCreate)),
  [string] $EntryPath, 
  [byte[]] $Content, 
  [switch] $OverWrite, #if specified, will not create a second copy of an existing entry 
  [switch] $PassThru ){#return a copy of $ZipStream
    $ZipArchive = New-Object IO.Compression.ZipArchive($ZipStream, [IO.Compression.ZipArchiveMode]::Update, $true)
    $ExistingEntry = $ZipArchive.GetEntry($EntryPath) | ?{$_} 
    If($OverWrite -and $ExistingEntry){
        Write-Verbose "    deleting existing $($ExistingEntry.FullName)"
        $ExistingEntry.Delete()
    }
    $Entry = $ZipArchive.CreateEntry($EntryPath)
    $WriteStream = New-Object System.IO.StreamWriter($Entry.Open())
    $WriteStream.Write($Content,0,$Content.Length)
    $WriteStream.Flush()
    $WriteStream.Dispose()
    $ZipArchive.Dispose()
    If($PassThru){
        $OutStream = New-Object System.IO.MemoryStream
        $ZipStream.Seek(0, 'Begin') | Out-Null
        $ZipStream.CopyTo($OutStream)
    }
    $ZipStream.Close()
    $ZipStream.Dispose()
    If($PassThru){$OutStream}
}

$NoDeleteFiles = @('files_meta.xml' ,'course_settings.xml', 'assignment_groups.xml', 'canvas_export.txt', 'imsmanifest.xml')

Set-Variable usrSuffix -Option ReadOnly -Value 'part' -Force
$MaxImportFileSize = 1000
$compressionLevel = [System.IO.Compression.CompressionLevel]::Optimal
$SplitFileCounter = 1


$FileBrowser = New-Object System.Windows.Forms.OpenFileDialog
$FileBrowser.filter = "Canvas Export Files (*.imscc)| *.imscc"
[void]$FileBrowser.ShowDialog()
$FileBrowser.FileName

$FilePath = $FileBrowser.FileName

$OriginalArchivePath = $FilePath.Substring(0,$FilePath.Length-6)

$PartFileDirectoryName = $OriginalArchive   (Folder-SuffixGenerator($SplitFileCounter))   '.imscc'

$CourseZip = [IO.Compression.ZipFile]::OpenRead($FilePath)
$CourseZipFiles = $CourseZip.Entries | Sort Length -Descending
$CourseZip.Dispose()
<#
$SortingTable = $CourseZip.entries | Select Fullname,

  @{Name="Size";Expression={$_.length}},

  @{Name="CompressedSize";Expression={$_.Compressedlength}},

  @{Name="PctZip";Expression={[math]::Round(($_.compressedlength/$_.length)*100,2)}}|

Sort Size -Descending | format-table –AutoSize
#>

# Add mandatory files
ForEach($entry in $CourseZipFiles)
{
    if ($NoDeleteFiles.Contains($entry.Name)){
        Write-Output "Adding to Zip"   $entry.FullName
        # Add to Zip
        $fileBytes = Get-ZipEntryContent -ZipFilePath $FilePath -EntryPath $entry.FullName
        Add-ZipEntry -ZipFilePath ($OriginalArchivePath   $PartFileDirectoryName) -EntryPath $entry.FullName -Content $fileBytes
    }

    
}```

uj5u.com熱心網友回復：

System.IO.StreamWriter是文本撰寫器，因此不適合撰寫原始位元組。表示將文本（由有效代碼點（范圍- ）的實體組成的 .NET 字串）轉換為實體（- ）Cannot convert value "507" to type "System.Byte"的嘗試不恰當。因此，任何代碼點大于( ) 的 Unicode 字符都會導致此錯誤。[char][uint16]0x00xffff[byte]0x00xff2550xff

解決方案是使用允許寫入原始位元組的 .NET API，即System.IO.BinaryWriter：

    $WriteStream = [System.IO.BinaryWriter]::new($Entry.Open())
    $WriteStream.Write($Content)
    $WriteStream.Flush()
    $WriteStream.Dispose()

標籤：电源外壳 压缩 文件流 system.io.compression 压缩流

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