They say "The third time is a charm."
Well, this my 3rd attempt at solving this. Info for second attempt is still valid, but only for certain zip files, so you can find that info farther down in this answer.
First, install the latest version of 7-zip from https://www.7-zip.org/.
In my case, installed 7z2201-x64.exe.
Second, Download Nuget package for SevenZipSharp, then, using 7-Zip to open the package, navigate to sevenzipsharp.net45.1.0.19.nupkg\lib\net45\ and save SevenZipSharp.dll to same location as your PowerShell script.
Either of the following seems to work for the download:
https://www.nuget.org/api/v2/package/SevenZipSharp.Net45/1.0.19
Or
https://globalcdn.nuget.org/packages/sevenzipsharp.net45.1.0.19.nupkg
Third, take note of where 7-Zip's 7z.dll file is installed. In my case, it was C:\Program Files\7-Zip\7z.dll.
Forth, add the following lines to the top of your PowerShell script, making sure the path given to SetLibraryPath is set to that of 7-Zip's 7z.dll found in the Third step from above.
using namespace System.IO
Add-Type -Path "$PSScriptRoot\SevenZipSharp.dll"
[SevenZip.SevenZipExtractor]::SetLibraryPath('C:\Program Files\7-Zip\7z.dll')
Fifth, add the code you want to run.
This example reads all the file path names found in the archive file SevenZipTest.zip which is found in the same path as the PowerShell script:
function ReadFilenamesIn7Zip {
param (
[Parameter(Mandatory = $true, Position = 0)]
[string]$Path
)
[SevenZip.SevenZipExtractor]$ZipArchive = [SevenZip.SevenZipExtractor]::new($Path)
foreach($ArchiveFileInfo in $ZipArchive.ArchiveFileData) {
$ArchiveFileInfo.FileName
}
$ZipArchive.Dispose()
}
ReadFilenamesIn7Zip "$PSScriptRoot\SevenZipTest.zip"
This example reads all the file lines from the first internal file named Test.TXT that is found in the archive file SevenZipTest.zip which is found in the same path as the PowerShell script:
function ReadFileIn7Zip {
param (
[Parameter(Mandatory = $true, Position = 0)]
[string]$Path,
[Parameter(Mandatory = $true, Position = 1)]
[string]$FileToUnzip,
[Parameter(Mandatory = $false, Position = 2)]
[int]$FileIndex = -1
)
[SevenZip.SevenZipExtractor]$ZipArchive = [SevenZip.SevenZipExtractor]::new($Path)
$ThisFileIndex = 0
foreach($ArchiveFileInfo in $ZipArchive.ArchiveFileData) {
$FileNameNoPath = Split-Path $ArchiveFileInfo.FileName -leaf
if($FileNameNoPath -eq $FileToUnzip) {
if($FileIndex -lt 0 -or $FileIndex -eq $ThisFileIndex) {
$MemoryStream = [System.IO.MemoryStream]::new()
$ZipArchive.ExtractFile($ArchiveFileInfo.Index, $MemoryStream)
[StreamReader]$ZipReader = [StreamReader]::new($MemoryStream)
$MemoryStream.Position = 0
while ($null -ne ($line = $ZipReader.ReadLine())) {
$line
}
$ZipReader.Dispose()
# $MemoryStream.Dispose() # Not needed: https://learn.microsoft.com/en-us/dotnet/api/system.io.memorystream?view=net-6.0#remarks
}
$ThisFileIndex++
}
}
$ZipArchive.Dispose()
}
ReadFileIn7Zip "$PSScriptRoot\SevenZipTest.zip" "Test.TXT" 0
The functionality of ReadFilenamesIn7Zip and ReadFileIn7Zip is essentially the same as the ReadFilenamesInZip and ReadFileInZip examples below. For example, if you look at the functionality of the ReadFileInZip function below, when calling it without the -FileIndex parameter, it will return all text from all files matching the -FileToUnzip parameter, which is also true for ReadFileIn7Zip.
NOTE: {Info from second attempt is below this point.}
Info below appears to be valid only for zip files compressed with * Deflate, BZip2, and LZMA
This example takes the zip file 01_SQLite.zip and searches for any file by the name App.config. This is strongly similar to a reading version, and PowerShell equivalent, of the link jdweng provided in the comments, but several modifications such as storing the file in a StringBuilder.
UPDATE: The code was working in VSCode, but discovered it wasn't working in PowerShell 5.1 Terminal. Both should be the same, but for some reason they are not - and VSCode is set to reload PowerShell prior to each run of a script, so there shouldn't be any assemblies pre-loaded.
SOLUTION: Thank you Santiago, Added Add-Type -Assembly System.IO.Compression, System.IO.Compression.FileSystem to the code.
Verified this worked by closing PowerShell terminal, re-open it, and running script:
using namespace System.IO
using namespace System.IO.Compression
using namespace System.IO.MemoryStream
using namespace System.Text
Add-Type -Assembly System.IO.Compression, System.IO.Compression.FileSystem
$ZipFilePath = "$PSScriptRoot\01_SQLite.zip"
[ZipArchive]$ZipArchive = [ZipFile]::Open($ZipFilePath, [ZipArchiveMode]::Read)
[StringBuilder]$SB = [StringBuilder]::new()
foreach($ZipEntry in $ZipArchive.Entries) {
if($ZipEntry.Name -eq "App.config") {
[StreamReader]$ZipReader = [StreamReader]::new($ZipEntry.Open())
while ($null -ne ($line = $ZipReader.ReadLine())) {
$null = $SB.AppendLine($line)
}
# Do something with the file stored in StringBuilder $SB
Write-Host "Found file $($ZipEntry.FullName)"
Write-Host $SB.ToString()
Write-Host
$null = $SB.Clear()
$ZipReader.Dispose()
}
}
$ZipArchive.Dispose()
More Versatile and Useful Code:
This function returns the file paths and names found in the Zip file:
using namespace System.IO
using namespace System.IO.Compression
Add-Type -Assembly System.IO.Compression, System.IO.Compression.FileSystem
function ReadFilenamesInZip {
param (
[Parameter(Mandatory = $true, Position = 0)]
[string]$Path
)
[ZipArchive]$ZipArchive = [ZipFile]::Open($Path, [ZipArchiveMode]::Read)
foreach($ZipEntry in $ZipArchive.Entries) {
$ZipEntry.FullName
}
$ZipArchive.Dispose()
}
Example use, reading file pathnames from 01_SQLite.zip file:
$ZipFilePath = "$PSScriptRoot\01_SQLite.zip"
$FileNames = ReadFilenamesInZip -Path $ZipFilePath
$FileNames
Resulting in this output:
screenshot.png
sqlite_test.sln
sqlite_test/App.config
sqlite_test/App.xaml
sqlite_test/App.xaml.cs
sqlite_test/MainWindow.xaml
sqlite_test/MainWindow.xaml.cs
sqlite_test/packages.config
sqlite_test/Properties/AssemblyInfo.cs
sqlite_test/Properties/Resources.Designer.cs
sqlite_test/Properties/Resources.resx
sqlite_test/Properties/Settings.Designer.cs
sqlite_test/Properties/Settings.settings
sqlite_test/sqlite_test.csproj
Example use, reading file pathnames from a zip file I created named TestZip.zip:
$ZipFilePath = "$PSScriptRoot\TestZip.zip"
$FileNames = ReadFilenamesInZip -Path $ZipFilePath
$FileNames
Resulting in this output:
Folder1/Test.TXT
Folder2/Test.TXT
Test.TXT
This function returns the content of all files matching a certain file name:
using namespace System.IO
using namespace System.IO.Compression
Add-Type -Assembly System.IO.Compression, System.IO.Compression.FileSystem
function ReadFileInZip {
param (
[Parameter(Mandatory = $true, Position = 0)]
[string]$Path,
[Parameter(Mandatory = $true, Position = 1)]
[string]$FileToUnzip,
[Parameter(Mandatory = $false, Position = 2)]
[int]$FileIndex = -1
)
[ZipArchive]$ZipArchive = [ZipFile]::Open($Path, [ZipArchiveMode]::Read)
$ThisFileIndex = 0
foreach($ZipEntry in $ZipArchive.Entries) {
if($ZipEntry.Name -eq $FileToUnzip) {
if($FileIndex -lt 0 -or $FileIndex -eq $ThisFileIndex) {
[StreamReader]$ZipReader = [StreamReader]::new($ZipEntry.Open())
while ($null -ne ($line = $ZipReader.ReadLine())) {
$line
}
$ZipReader.Dispose()
}
$ThisFileIndex++
}
}
$ZipArchive.Dispose()
}
Example use of extracting from TestZip.zip the content of all internal file matching the file name Test.TXT:
$ZipFilePath = "$PSScriptRoot\TestZip.zip"
$FileLines = ReadFileInZip -Path $ZipFilePath -FileToUnzip 'Test.TXT'
if ($null -ne $FileLines) {
Write-Host 'Found File(s):'
$FileLines
} else {
Write-Host 'File NOT found.'
}
Resulting in this output:
Found File(s):
### Folder 1 Text File ###
Random info in Folder 1 text file
### Folder 2 Text File ###
Random info in Folder 2 text file
### Root Text File ###
Random info in root text file
Example reading the content of only the first file with matching name -
Take note of the added -FileIndex 0:
$ZipFilePath = "$PSScriptRoot\TestZip.zip"
$FileLines = ReadFileInZip -Path $ZipFilePath -FileToUnzip 'Test.TXT' -FileIndex 0
if ($null -ne $FileLines) {
Write-Host 'Found File(s):'
$FileLines
} else {
Write-Host 'File NOT found.'
}
Resulting in this output:
Found File(s):
### Folder 1 Text File ###
Random info in Folder 1 text file
Changing -FileIndex 0 to -FileIndex 2 gives these results:
Found File(s):
### Root Text File ###
Random info in root text file
Changing FileIndex to a value that does not point to a file inside the zip, such as -FileIndex 3, gives these results:
File NOT found.
