====== Récupérer les logiciels installés avec Powershell sur Windows ======

===== Via les clefs de registre =====
<sxh PowerShell>
# Récupérer la liste via les clefs de registre
Get-ChildItem -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ | Get-ItemProperty |
Select-Object DisplayName, DisplayVersion
# Récupérer la liste via les clefs de registre Wow6432node avec une vérification
$RegWow6432node = 'HKLM:\SOFTWARE\Wow6432node\Microsoft\Windows\CurrentVersion\Uninstall'
if((((Get-Item -Path $RegWow6432node).GetValue($value)) -ne $null) -eq $false)
{
Get-ChildItem -Path $RegWow6432node | Get-ItemProperty |
Select-Object DisplayName, DisplayVersion | Format-List
}
</sxh>

===== Chocolatey =====

Si l'on utilise l'application Chocolatey, il est possible de récupérer la liste des applications installées avec lui.

<sxh Powershell>
if($env:Path -like '*chocolatey*') {
    choco list -lo
}
</sxh>

===== Eviter Get-CimInstance et Get-WMIObject =====

Utiliser la méthode Cim ou WMI, n'est pas conseillé car elle est très longue
==== WMI ====
<sxh Powershell>
Get-WmiObject -Class 'Win32_product'
</sxh>
==== CIM ====
<sxh Powershell>
Get-CimInstance -ClassName 'Win32_product'
</sxh>

===== Fonction pour récupérer à distance  =====

<sxh PowerShell Get-InstalledSoftware.ps1>
function Get-InstalledSoftware
{
	<#
	.SYNOPSIS
		Retrieves a list of all software installed on a Windows computer.
	.EXAMPLE
		PS> Get-InstalledSoftware
		
		This example retrieves all software installed on the local computer.
	.PARAMETER ComputerName
		If querying a remote computer, use the computer name here.
	
	.PARAMETER Name
		The software title you'd like to limit the query to.
	
	.PARAMETER Guid
		The software GUID you'e like to limit the query to
	#>
	[CmdletBinding()]
	param (
		
		[Parameter()]
		[ValidateNotNullOrEmpty()]
		[string]$ComputerName = $env:COMPUTERNAME,
		
		[Parameter()]
		[ValidateNotNullOrEmpty()]
		[string]$Name,
		
		[Parameter()]
		[ValidatePattern('\b[A-F0-9]{8}(?:-[A-F0-9]{4}){3}-[A-F0-9]{12}\b')]
		[string]$Guid
	)
	process
	{
		try
		{
			$scriptBlock = {
				$args[0].GetEnumerator() | ForEach-Object { New-Variable -Name $_.Key -Value $_.Value }
				
				$UninstallKeys = "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall", "HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall"
				New-PSDrive -Name HKU -PSProvider Registry -Root Registry::HKEY_USERS | Out-Null
				$UninstallKeys += Get-ChildItem HKU: | where { $_.Name -match 'S-\d-\d+-(\d+-){1,14}\d+$' } | foreach { "HKU:\$($_.PSChildName)\Software\Microsoft\Windows\CurrentVersion\Uninstall" }
				if (-not $UninstallKeys)
				{
					Write-Warning -Message 'No software registry keys found'
				}
				else
				{
					foreach ($UninstallKey in $UninstallKeys)
					{
						$friendlyNames = @{
							'DisplayName' = 'Name'
							'DisplayVersion' = 'Version'
						}
						Write-Verbose -Message "Checking uninstall key [$($UninstallKey)]"
						if ($Name)
						{
							$WhereBlock = { $_.GetValue('DisplayName') -like "$Name*" }
						}
						elseif ($GUID)
						{
							$WhereBlock = { $_.PsChildName -eq $Guid }
						}
						else
						{
							$WhereBlock = { $_.GetValue('DisplayName') }
						}
						$SwKeys = Get-ChildItem -Path $UninstallKey -ErrorAction SilentlyContinue | Where-Object $WhereBlock
						if (-not $SwKeys)
						{
							Write-Verbose -Message "No software keys in uninstall key $UninstallKey"
						}
						else
						{
							foreach ($SwKey in $SwKeys)
							{
								$output = @{ }
								foreach ($ValName in $SwKey.GetValueNames())
								{
									if ($ValName -ne 'Version')
									{
										$output.InstallLocation = ''
										if ($ValName -eq 'InstallLocation' -and ($SwKey.GetValue($ValName)) -and (@('C:', 'C:\Windows', 'C:\Windows\System32', 'C:\Windows\SysWOW64') -notcontains $SwKey.GetValue($ValName).TrimEnd('\')))
										{
											$output.InstallLocation = $SwKey.GetValue($ValName).TrimEnd('\')
										}
										[string]$ValData = $SwKey.GetValue($ValName)
										if ($friendlyNames[$ValName])
										{
											$output[$friendlyNames[$ValName]] = $ValData.Trim() ## Some registry values have trailing spaces.
										}
										else
										{
											$output[$ValName] = $ValData.Trim() ## Some registry values trailing spaces
										}
									}
								}
								$output.GUID = ''
								if ($SwKey.PSChildName -match '\b[A-F0-9]{8}(?:-[A-F0-9]{4}){3}-[A-F0-9]{12}\b')
								{
									$output.GUID = $SwKey.PSChildName
								}
								New-Object –TypeName PSObject –Prop $output
							}
						}
					}
				}
			}
			
			if ($ComputerName -eq $env:COMPUTERNAME)
			{
				& $scriptBlock $PSBoundParameters
			}
			else
			{
				Invoke-Command -ComputerName $ComputerName -ScriptBlock $scriptBlock -ArgumentList $PSBoundParameters
			}
		}
		catch
		{
			Write-Error -Message "Error: $($_.Exception.Message) - Line Number: $($_.InvocationInfo.ScriptLineNumber)"
		}
	}
}

</sxh>