Public/Get-PdqInstalledVersion.ps1
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<#
.SYNOPSIS Searches the registry for the currently installed version. .DESCRIPTION Installed applications have entries in the following registry keys: 32-bit app on 32-bit OS, or 64-bit app on 64-bit OS: HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall 32-bit app on 64-bit OS: HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall PDQ Deploy and Inventory are .NET Framework applications that use the AnyCPU architecture, so the architecture of the OS determines which registry path their entries will exist in. If a matching registry entry cannot be found, this function will return an error. .INPUTS None. .OUTPUTS System.Version .EXAMPLE Get-PdqInstalledVersion -Product 'Deploy' Outputs the version number for the currently installed instance of PDQ Deploy. #> function Get-PdqInstalledVersion { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateSet('Deploy', 'Inventory')] # The PDQ application you would like to execute this function against. [String]$Product ) # Determine which registry path should be searched. $Software = 'SOFTWARE' if ( [Environment]::Is64BitOperatingSystem ) { $Software += '\WOW6432Node' } $RegPath = "HKLM:\$Software\Microsoft\Windows\CurrentVersion\Uninstall\*" # Search the registry for information about installed applications. $RegData = Get-ItemProperty -Path $RegPath | Where-Object 'DisplayName' -eq "PDQ $Product" if ( $RegData ) { # A single result will be a PSCustomObject, but multiple results will show up as Object[]. if ( $RegData -is 'PSCustomObject' ) { [Version]$Version = $RegData.DisplayVersion Write-Verbose "Installed PDQ $Product version: $Version" $Version } else { throw "Found multiple registry entries with a DisplayName of: PDQ $Product" } } else { throw "Unable to find a version number for PDQ $Product. Please make sure it is installed." } } |