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Building Excel Reports with PowerShell

Jan 30, 2013

Last year I wrote a series of articles for the Petri IT KnowledgeBase on using Microsoft Excel with PowerShell. Today I received an email from a reader who had a question about article that showed how to build a drive usage report in Excel. In the article I suggest it wouldn’t be too difficult to modify my sample code to create a worksheet for each computer. Perhaps I was a bit too glib. So I decided to revise my sample script so that you could pass an array of computernames and build a single workbook with a named worksheet for each computer.

#Requires -version 2.0

this version takes an array of computer names and creates a new
worksheet for each one.


#I hope it goes without saying that Excel needs to be installed
Write-Verbose "Creating Excel application"
$xl=New-Object -ComObject "Excel.Application"

#we'll need some constants

Foreach ($computer in $computername) {
    #get disk data
    Write-Verbose "Getting disk data from $computer"
    $disks=Get-WmiObject -Class Win32_LogicalDisk -ComputerName $computer -Filter "DriveType=3"

    Write-Verbose "Adding Worksheet"

    $cells.item(1,1)="Disk Drive Report"

    #define some variables to control navigation

    #insert column headings
    Write-Verbose "Adding drive headings"

    "Drive","SizeGB","FreespaceGB","UsedGB","%Free","%Used" | foreach {

    Write-Verbose "Adding drive data"
    foreach ($drive in $disks) {
        $cells.item($Row,$col)=($drive.Size - $drive.Freespace)/1GB
        $cells.item($Row,$col)=($drive.Size - $drive.Freespace) / $drive.size

    Write-Verbose "Adding some style"

    #add some style
    #or set it like this
    $ws.Range("A3:F3").Style = "Heading 2"

    #adjust some column widths
    Write-Verbose "Adjusting column widths"
    $ws.columns.item("B:B").EntireColumn.AutoFit() | out-null

    #add some conditional formatting
    Write-Verbose "Adding conditional formatting"

    #get the starting cell
    #get the last cell
    #add the icon set
    $Selection.FormatConditions.AddIconSetCondition() | Out-Null
    $Selection.FormatConditions.item(1).ReverseOrder = $True
    $Selection.FormatConditions.item(1).ShowIconOnly = $False
    $Selection.FormatConditions.item(1).IconSet = $xlIconSet::xl3TrafficLights1
    #insert a graph
    Write-Verbose "Creating a graph"

    #get the last cell
    #get the last cell


    #add labels
    $chart.seriesCollection(1).Select() | Out-Null
    $chart.SeriesCollection(1).ApplyDataLabels() | out-Null
    #modify the chart title
    $chart.ChartTitle.Text = "Utilization"
    Write-Verbose "Repositioning graph"
    $ws.shapes.item("Chart 1").top=40
    $ws.shapes.item("Chart 1").left=400

    Write-Verbose "Renaming the worksheet"  
    #rename the worksheet
    #select A1
    $ws.Range("A1").Select() | Out-Null
} #foreach

#delete extra sheets
Write-Verbose "Deleting extra worksheets"

#make Excel visible

$filepath=Read-Host "Enter a path and filename to save the file"

if ($filepath) {
    Write-Verbose "Saving file to $filepath"

#end of script

If you looked at the original post, here are the changes I made. First, I modified the script parameters to take an array of computer names.


I decided to change the parameter name as well which worked out well because I could keep most of my code for each computer and simply insert a ForEach loop.

Foreach ($computer in $computername) {
    #get disk data
    Write-Verbose "Getting disk data from $computer"
    $disks=Get-WmiObject -Class Win32_LogicalDisk -ComputerName $computer -Filter "DriveType=3"

This also meant I needed to move some code to before this loop since I only have to create the Excel application and workbook objects once. For each computer I use WMI to get disk data and create a new worksheet.

    Write-Verbose "Adding Worksheet"

The rest of the Excel-related code remains the same for each computer. But I did alter the code to rename each worksheet.

#rename the worksheet

I also decided to delete the “extra” sheets. Unless you’ve modified Excel’s startup behavior new workbooks have Sheet1, Sheet2 and Sheet3 which I don’t need so I delete them.

#delete extra sheets
Write-Verbose "Deleting extra worksheets"

With this new script I can run a command like this:

PS Scripts:\> .\New-ExcelDiskSpace2A.ps1 -computer novo8,jdhit-dc01 -Verbose

Which gives me a single workbook with a worksheet for each computer:


Download my revised script New-ExcelDiskSpace2A.

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