ModernWorkplaceClientCenter

0.1.3

Internal/Get-InstalledApplication.ps1

                                Function Get-InstalledApplication {

    <#

    .SYNOPSIS

         Retrieves information about all installed applications.

    .DESCRIPTION

         Retrieves information about all installed applications by querying the registry.

         Returns information about application publisher, name & version, product code, uninstall string, install source, location, date, and application architecture.

    .EXAMPLE

         Get-InstalledApplication

    #>

    [OutputType([System.Object[]])]

    [CmdletBinding()]

    param()

    [string[]]$regKeyApplications = 'HKLM:SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall','HKLM:SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall'

    ## Enumerate the installed applications from the registry for applications that have the "DisplayName" property

    [psobject[]]$regKeyApplication = @()

    ForEach ($regKey in $regKeyApplications) {

        If (Test-Path -LiteralPath $regKey -ErrorAction 'SilentlyContinue') {

            [psobject[]]$UninstallKeyApps = Get-ChildItem -LiteralPath $regKey -ErrorAction 'SilentlyContinue'

            ForEach ($UninstallKeyApp in $UninstallKeyApps) {

                Try {

                        [psobject]$regKeyApplicationProps = Get-ItemProperty -LiteralPath $UninstallKeyApp.PSPath -ErrorAction 'Stop'

                        If ($regKeyApplicationProps.DisplayName) { [psobject[]]$regKeyApplication += $regKeyApplicationProps }

                }

                Catch{

                        Write-Warning "Unable to enumerate properties from registry key path [$($UninstallKeyApp.PSPath)]."

                        Continue

                }

            }

        }

    }

    ## Create a custom object with the desired properties for the installed applications and sanitize property details

    [psobject[]]$installedApplication = @()

    ForEach ($regKeyApp in $regKeyApplication) {

        Try {

            [string]$appDisplayName = ''

            [string]$appDisplayVersion = ''

            [string]$appPublisher = ''

            ## Remove any control characters which may interfere with logging and creating file path names from these variables

            $appDisplayName = $regKeyApp.DisplayName -replace '[^\u001F-\u007F]',''

            $appDisplayVersion = $regKeyApp.DisplayVersion -replace '[^\u001F-\u007F]',''

            $appPublisher = $regKeyApp.Publisher -replace '[^\u001F-\u007F]',''

            ## Determine if application is a 64-bit application

            [boolean]$Is64BitApp = If (($is64Bit) -and ($regKeyApp.PSPath -notmatch '^Microsoft\.PowerShell\.Core\\Registry::HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node')) { $true } Else { $false }

            $installedApplication += New-Object -TypeName 'PSObject' -Property @{

                UninstallSubkey = $regKeyApp.PSChildName

                ProductCode = If ($regKeyApp.PSChildName -match $MSIProductCodeRegExPattern) { $regKeyApp.PSChildName } Else { [string]::Empty }

                DisplayName = $appDisplayName

                DisplayVersion = $appDisplayVersion

                UninstallString = $regKeyApp.UninstallString

                InstallSource = $regKeyApp.InstallSource

                InstallLocation = $regKeyApp.InstallLocation

                InstallDate = $regKeyApp.InstallDate

                Publisher = $appPublisher

                Is64BitApplication = $Is64BitApp

            }

        }

        Catch {

            Write-Error "Failed to resolve application details from registry for [$appDisplayName]. $($_.Exception)"

            Continue

        }

    }

    Write-Information "Found $($installedApplication.Count) Apps."

    return $installedApplication

}

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