PowerShell to find folder / file size - powershell

Question

I am trying to write a script using powershell to get folder / file size as mentioned below
$StartFolder = "D:\"
$Output = "C:\Temp\test-d.csv"
Add-Content -Value "Folder Path|Size" -Path $Output
$colItems = (Get-ChildItem $startFolder -Recurse | Measure-Object -Property Length -Sum)
"$StartFolder -- " + "{0:N2}" -f ($colItems.Sum / 1MB) + " MB" # | Out-File $Output
$colItems = (Get-ChildItem $startFolder -Recurse | Where-Object {$_.PSIsContainer -eq $True} | Sort-Object)
foreach ($i in $colItems) {
$subFolderItems = (Get-ChildItem $i.FullName -Recurse | Measure-Object -Property Length -Sum)
$i.FullName + "|" + "{0:N2}" -f ($subFolderItems.Sum / 1MB) + " MB" | Out-File $Output -Append
}
I am getting error as mentioned below:
Measure-Object : The property "Length" cannot be found in the input for any
objects.
At line:12 char:65
+ $subFolderItems = (Get-ChildItem $i.FullName -Recurse | Measure-Object - ...
+
+ CategoryInfo : InvalidArgument: (:) [Measure-Object], PSArgumentException
+ FullyQualifiedErrorId : GenericMeasurePropertyNotFound,Microsoft.PowerShell.Commands.MeasureObjectCommand
Measure-Object : The property "Length" cannot be found in the input for any
objects.
At line:12 char:65
+ $subFolderItems = (Get-ChildItem $i.FullName -Recurse | Measure-Object - ...
+
+ CategoryInfo : InvalidArgument: (:) [Measure-Object], PSArgumentException
+ FullyQualifiedErrorId : GenericMeasurePropertyNotFound,Microsoft.PowerShell.Commands.MeasureObjectCommand
Also, when I target C: drive I am getting "access denied" on some system files:
Get-ChildItem : Access to the path 'C:\Windows\System32\LogFiles\WMI\RtBackup'
is denied.
At line:12 char:28
+ $subFolderItems = (Get-ChildItem $i.FullName -Recurse | Measure-Object - ...
+
+ CategoryInfo : PermissionDenied: (C:\Windows\Syst...es\WMI\RtBackup:String) [Get-ChildItem], UnauthorizedAccessException
+ FullyQualifiedErrorId : DirUnauthorizedAccessError,Microsoft.PowerShell.Commands.GetChildItemCommand

Answer 1

DirectoryInfo objects don't have a property Length, so you need to restrict your size calculation to files.
$colItems = Get-ChildItem $startFolder -Recurse -Force |
Where-Object { -not $_.PSIsContainer } |
Measure-Object -Property Length -Sum
It might be easier to use a Scripting.FileSystemObject COM object, because that will allow you to get directory objects with the size of their content. And you may want to use Export-Csv for exporting your data to a CSV. Use calculated properties for building the required objects.
$fso = New-Object -COM 'Scripting.FileSystemObject'
$folders = #($StartFolder)
$folders += Get-ChildItem $StartFolder -Recurse -Force |
Where-Object { $_.PSIsContainer } |
Select-Object -Expand FullName
$folders |
Select-Object #{n='Path';e={$_}}, #{n='Size';e={$fso.GetFolder($_).Size}} |
Export-Csv $Output -Delimiter '|' -NoType