Why is try {} on my ps1 script wont work? - powershell

Question

I have a code like this:
$powerSchemes = powercfg /l | ForEach-Object {
if ($_ -match 'Power Scheme GUID:\s*([-0-9a-f]+)\s*\(([^)]+)\)\s*(\*)?') {
[PsCustomObject]#{
GUID = $matches[1]
SchemeName = $matches[2] -eq 'Ultimate Performance'
Active = $matches[3]
}
}
}
$customScheme = $powerSchemes | Where-Object { $_.SchemeName -eq 'Ultimate Performance' }
try {
if (!$customScheme.Active) {
powercfg /s $($customScheme.GUID)
}
} catch {
powercfg -duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61
if (!$customScheme.Active) {
powercfg /s $($customScheme.GUID)
}
}
I make a try{} cause I know not everyone going to have Ultimate Performance powerplan. But it give me error
powercfg : Invalid Parameters -- try "/?" for help
At C:\Users\MyWin\Desktop\PowerPlan.ps1:15 char:3
+ powercfg /s $($customScheme.GUID)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (Invalid Parameters -- try "/?" for help:String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError
isn't try{} going ignore
try {
if (!$customScheme.Active) {
powercfg /s $($customScheme.GUID)
}
and just jump to the catch{}??
Sorry I'm a newbie though, if you need more information about the code, just tell me
reason I didnt put
powercfg -duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61
if (!$customScheme.Active) {
powercfg /s $($customScheme.GUID)
on try{} so it didn't keep making new powerplan, if theres already Ultimate Performance powerplan, then just active it

Answer 1

*** UPDATED ***
Actually you don't even need a try/catch block:
Clear-Host
$TestScheme = 'Ultimate Performance'
$powerSchemes = powercfg /l | ForEach-Object {
if ($_ -match 'Power Scheme GUID:\s*([-0-9a-f]+)\s*\(([^)]+)\)\s*(\*)?') {
[PsCustomObject]#{
GUID = $matches[1]
SchemeName = $matches[2]
Active = $matches[3] -eq '*'
}
}
}
$powerschemes #*** For Debugging Only ***
$customScheme = $powerSchemes | Where-Object { $_.SchemeName -eq "$TestScheme" }
$ErrorActionPreference = "SilentlyContinue" #*** For Debugging Only ***
"`nCustom Scheme: $($customScheme.SchemeName) `n" #*** For Debugging Only ***
$ErrorActionPreference = "Continue" #*** For Debugging Only ***
If ($Null -eq $CustomScheme) {
"Power scheme named: $TestScheme does NOT Exist!"
}
Else {
If ($customScheme.Active) {
"$TestScheme scheme ACTIVE!"
}
Else {
"$TestScheme Not Active"
}
} #End Else
Test this code on my Dell XPS8920 which has an Ultimate Performance scheme.
I've completely rewritten the code and I think it covers the bases. Note: that I changed your Custom PSObject logic to keep the name and indicate the status in the Active property.
Here are the test results with debugging information included, you can delete the code marked as such for production.
GUID SchemeName Active
---- ---------- ------
381b4222-f694-41f0-9685-ff5bb260df2e Balanced False
49ef8fc0-bb7f-488e-b6a0-f1fc77ec649b Dell False
831878fb-3408-4f4b-a88c-72fdbe2ced67 Ultimate Performance True
8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c High performance False
a1841308-3541-4fab-bc81-f71556f20b4a Power saver False
a7573aee-d201-4451-bf29-7165c6858f5c winword False
f92ea615-6000-45ae-96b2-cb6c364f0ae4 MRBackup False
fce6c371-318d-4bc2-b28e-6425737e2eef Samsung High Performance False
Custom Scheme: Ultimate Performance
Ultimate Performance scheme ACTIVE!
GUID SchemeName Active
---- ---------- ------
381b4222-f694-41f0-9685-ff5bb260df2e Balanced False
49ef8fc0-bb7f-488e-b6a0-f1fc77ec649b Dell False
831878fb-3408-4f4b-a88c-72fdbe2ced67 Ultimate Performance True
8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c High performance False
a1841308-3541-4fab-bc81-f71556f20b4a Power saver False
a7573aee-d201-4451-bf29-7165c6858f5c winword False
f92ea615-6000-45ae-96b2-cb6c364f0ae4 MRBackup False
fce6c371-318d-4bc2-b28e-6425737e2eef Samsung High Performance False
Custom Scheme: Ultimate Performance
Ultimate Performance scheme ACTIVE!
GUID SchemeName Active
---- ---------- ------
381b4222-f694-41f0-9685-ff5bb260df2e Balanced False
49ef8fc0-bb7f-488e-b6a0-f1fc77ec649b Dell False
831878fb-3408-4f4b-a88c-72fdbe2ced67 Ultimate Performance False
8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c High performance True
a1841308-3541-4fab-bc81-f71556f20b4a Power saver False
a7573aee-d201-4451-bf29-7165c6858f5c winword False
f92ea615-6000-45ae-96b2-cb6c364f0ae4 MRBackup False
fce6c371-318d-4bc2-b28e-6425737e2eef Samsung High Performance False
Custom Scheme:
Power scheme named: Test does NOT Exist!

Answer 2

Since the SchemeNames returned by powercfg are LOCALIZED, you should not compare against that, but always use the GUID.
In your case, you want to activate the Ultimate Performance scheme, which is not enabled by default and therefore chances are powercfg /l does not show this scheme.
Try
$desiredScheme = 'e9a42b02-d5df-448d-aa00-03f14749eb61' # we want to activate Ultimate Performance
$powerSchemes = powercfg /l | ForEach-Object {
if ($_ -match 'Power Scheme GUID:\s*([-0-9a-f]+)\s*\(([^)]+)\)\s*(\*)?') {
[PsCustomObject]#{
GUID = $matches[1]
SchemeName = $matches[2]
Active = $matches[3] -eq '*' # --> $true or $false
}
}
}
# GUID SchemeName Active
# ---- ---------- ------
# 381b4222-f694-41f0-9685-ff5bb260df2e Balanced False
# 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c High performance True
# a1841308-3541-4fab-bc81-f71556f20b4a Power saver False
# e9a42b02-d5df-448d-aa00-03f14749eb61 Ultimate Performance False
# NOTE
# -------------------------------------------------------------------------------------------
# 1) The Ultimate Performance scheme may not appear here because it is not enabled by default
# 2) The SchemeName is LOCALIZED, like in Dutch NL pc 'Power saver' is 'Energiebesparing' etc.
# This means you should not compare on the SchemeName, but use the GUID instead
$currentScheme = $powerSchemes | Where-Object { $_.GUID -eq $desiredScheme }
if (!$currentScheme) {
# scheme 'Ultimate Performance' not found, so enable it first
powercfg /duplicatescheme $desiredScheme
# and set it active
powercfg /s $desiredScheme
}
elseif (!$currentScheme.Active) {
powercfg /s $desiredScheme # or use: $currentScheme.GUID
}
If after this you want to check if the power scheme has been set to Ultimate Performance, do
# test if the setting is as desired (just compare GUIDs)
$currentScheme = (powercfg.exe /GETACTIVESCHEME) -replace '.*GUID:\s*([-a-f0-9]+).*', '$1'
if ($currentScheme -eq $desiredScheme) {
Write-Host "Current Power plan Settings: $($desiredScheme.SchemeName).!"
}
else {
# exit the script here???
Throw "Power plan Settings did not change to $($desiredScheme.SchemeName).!"
}