ZipFiles.ps1

    Function ZipFiles {
        <#
       .SYNOPSIS
              A function to zip or unzip files.
       .DESCRIPTION
              This function has 3 possible uses.
              1) Zip a folder or files and save the zip to specified location.
              2) Unzip a zip file to a specified folder.
              3) Unzip a zip file and delete the original zip when complete.       
       
       .PARAMETER ZipPath
              The full path of the file to unzip or the full path of the zip file to be created.
       
       .PARAMETER FolderPath
              The path to the files to zip or the path to the directory to unzip the files to.
       
       .PARAMETER Unzip
              If $true the function will perform an unzip instead of a zip
       
       .PARAMETER DeleteZip
              If set to $True the zip file will be removed at then end of the unzip operation.
       
       .EXAMPLE
              PS C:\> ZipFiles -ZipPath 'C:\Windows\Temp\ziptest.zip' -FolderPath 
              PS C:\> ZipFiles -ZipPath 'C:\Windows\Temp\ziptest.zip' -FolderPath 'C:\Windows\Temp\ZipTest' -Unzip $true
              PS C:\> ZipFiles -ZipPath 'C:\Windows\Temp\ziptest.zip' -FolderPath 'C:\Windows\Temp\ZipTest' -Unzip $true -DeleteZip $True
       
       .NOTES
              Additional information about the function.
#>
        [CmdletBinding(DefaultParameterSetName = 'Zip')]
        param
        (
            [Parameter(ParameterSetName = 'Unzip')]
            [Parameter(ParameterSetName = 'Zip',
                Mandatory = $true,
                Position = 0)]
            [ValidateNotNull()]
            [string]$ZipPath,
            [Parameter(ParameterSetName = 'Unzip')]
            [Parameter(ParameterSetName = 'Zip',
                Mandatory = $true,
                Position = 1)]
            [ValidateNotNull()]
            [string]$FolderPath,
            [Parameter(ParameterSetName = 'Unzip',
                Mandatory = $false,
                Position = 2)]
            [ValidateNotNull()]
            [bool]$Unzip,
            [Parameter(ParameterSetName = 'Unzip',
                Mandatory = $false,
                Position = 3)]
            [ValidateNotNull()]
            [bool]$DeleteZip
        )
        Log-Message "Entering Zip-Actions Function."
        switch ($PsCmdlet.ParameterSetName) {
            'Zip' {
                If ([int]$psversiontable.psversion.Major -lt 3) {
                    Log-Message "Step 1"
                    New-Item $ZipPath -ItemType file
                    $shellApplication = new-object -com shell.application
                    $zipPackage = $shellApplication.NameSpace($ZipPath)
                    $files = Get-ChildItem -Path $FolderPath -Recurse
                    Log-Message "Step 2"
                    foreach ($file in $files) {
                        $zipPackage.CopyHere($file.FullName)
                        Start-sleep -milliseconds 500
                    }
                    Log-Message "Exiting Zip-Actions Function."
                    break           
                }
                Else {
                    Log-Message "Step 3"
                    Add-Type -assembly "system.io.compression.filesystem"
                    $Compression = [System.IO.Compression.CompressionLevel]::Optimal
                    [io.compression.zipfile]::CreateFromDirectory($FolderPath, $ZipPath, $Compression, $True)
                    Log-Message "Exiting Zip-Actions Function."
                    break
                }
            }
            'Unzip' {
                $shellApplication = new-object -com shell.application
                $zipPackage = $shellApplication.NameSpace($ZipPath)
                $destinationFolder = $shellApplication.NameSpace($FolderPath)
                $destinationFolder.CopyHere($zipPackage.Items(), 20)
                Log-Message "Exiting Unzip Section"
            }
        }
    }