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POPowerShell Script Starts Adding Blank Lines After 100+ Lines of Output?
 

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  1. POPowerShell Script Starts Adding Blank Lines After 100+ Lines of Output?
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    <p>I seem to have encountered a weird bug, or I've missed something in my script.</p> <p>In my scripts, I'm showing progress with a faux progress bar function. It works by updating the same line of the console repeatedly, mimicking a progress bar. See the function below:</p> <pre><code># Update-Progress-Bar : v1.0 : 2013-07-29 # Displays a percentage bar. Meant to be used repeatedly to update the same console line (giving the appearance of incrementing progress). # - $Percentage : Determines how much progress is shown on the bar. # - $Message : The message that accompanies the progress bar. function Update-Progress-Bar ($Percentage, $Message){ # Save the current cursor position so we can come back later. $CursorPosition = $Host.UI.RawUI.CursorPosition # Convert the percentage into a proper progress bar. $ProgressBarMax = "20" $ProgressBarCount = [Math]::Floor([Decimal]($Percentage / 5)) $ProgressBar = ("#" * $ProgressBarCount) + (" " * ($ProgressBarMax - $ProgressBarCount)) # Change the format of the percentage depending on length. switch ($Percentage.Length){ 1 {$Percentage = " " + $Percentage + "%"} 2 {$Percentage = " " + $Percentage + "%"} default {$Percentage = $Percentage + "%"} } # Trim or pad the message as necessary. $MessageMaxLength = "50" if ($Message.Length -gt $MessageMaxLength){ $Message = $Message.Remove($MessageMaxLength) } else { $Message = $Message + (" " * ($MessageMaxLength - $Message.Length)) } # Display our progress bar, percentage, and message. Write-Host -nonewline -ForeGroundColor Blue "[$ProgressBar] $Percentage" Write-Host " | $Message" # Revert back to the original cursor position. $Host.UI.RawUI.CursorPosition = $CursorPosition } </code></pre> <p>For whatever reason, after working for about 100+ records (I'm using this as part of a script where I'm regularly performing actions against 1000s of machines), it starts performing double line breaks, which ruins the functionality of the progress bar. So I end up with this...</p> <pre><code>[ 126 / 2275 ] ComputerName1 [ ] 0% | Verifying network connectivity... [## ] 10% | Verifying file system access... [#### ] 20% | Determining installed operating system... [###### ] 30% | Executing action... [####################] 100% | Action Completed [ 127 / 2275 ] ComputerName2 [ ] 0% | Verifying network connectivity... [## ] 10% | Verifying file system access... [#### ] 20% | Determining installed operating system... [###### ] 30% | Executing action... [####################] 100% | Action Completed </code></pre> <p>When I should have....</p> <pre><code>[ 126 / 2275 ] ComputerName1 [####################] 100% | Action Completed [ 127 / 2275 ] ComputerName2 [####################] 100% | Action Completed </code></pre> <p>Any thoughts on this issue and a possible workaround?</p> <p><strong>EDIT #1:</strong> Is it possible that this is happening when I hit the buffer height limit of the console (as in, it starts discarding the old lines of output)?</p> <p><strong>EDIT #2:</strong> I have confirmed that this issue goes away if I increase the buffer width and height of my console window. I'm still not sure how to workaround this bug though. Thoughts?</p>
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    1. COI never heard about using such hack `$Host.UI.RawUI.CursorPosition`, but you may be right with your assumption. As a side note, is there any reason why you don't want to use a [native progress bar available in Powershell](http://blogs.technet.com/b/heyscriptingguy/archive/2011/01/29/add-a-progress-bar-to-your-powershell-script.aspx)?
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    2. CO@Neolisk, I actually didn't know about the native progress bar option, though I recognize it from other plug-ins. I'll have to see if it I still like the functionality, but it seems like I'm still going to keep hitting some sort of buffer limit, unless I choose to stop displaying "historic" progress at all.
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    3. COI just hope they took care of known issues with their native progress bar. Did not use it much though, probably because the nature of my tasks never required it.
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