want the max and used from string - powershell

Question

#http://stackoverflow.com/a/24036900/175063
$user = "uuuu"
$pwd = "pppp"
$source = "http://1.1.1.1/manager/jmxproxy?get=java.lang:type=Memory&att=HeapMemoryUsage"
$destination = "D:\Work\ps\test.xml"
$wc = new-object System.Net.WebClient
$p = New-Object System.Net.WebProxy 'http://proxy:8080'
$p.UseDefaultCredentials = $true
$wc.proxy = $p
$credCache = New-Object System.Net.CredentialCache
$creds = New-Object System.Net.NetworkCredential($user, $pwd)
$credCache.Add($source, "Basic", $creds)
$wc.Credentials = $credCache
$wc.DownloadFile($source, $destination)
# max=1445462016, used=898674904
# free
foreach ($thing in Get-Content $destination) {
$max = $thing.split("max=")
$used = $thing.split("used=")
Write-Host $max
Write-Host $used
}
#$free = $max - $used
#Write-Host $free
The string the file that is downloaded is a one-liner:
OK - Attribute get 'java.lang:type=Memory' - HeapMemoryUsage= javax.management.openmbean.CompositeDataSupport(compositeType=javax.management.openmbean.CompositeType(name=java.lang.management.MemoryUsage,items=((itemName=committed,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)),(itemName=init,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)),(itemName=max,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)),(itemName=used,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)))),contents={committed=1444478976, init=1494220800, max=1445462016, used=868228272})
And all I really want from it is:
max=1445462016
used=868228272
to be:
1445462016-868228272=577233744

Answer 1

I would extract the values from the contents={...} portion of the string with a regular expression, replace the commas with newlines and convert the result to a hashtable. Then you just need to cast the values to integers for the calculation.
Get-Content $destination | Where-Object {
$_ -match ',contents=\{(.+?)\}'
} | ForEach-Object {
$values = $matches[1] -replace ', ', "`n" | ConvertFrom-StringData
$free = [int]$values['max'] - [int]$values['used']
'Max: {0}' -f $values['max']
'Used: {0}' -f $values['used']
'Free: {0}' -f $free
}

Answer 2

I think I interpreted this correctly, do you want to display this in the console or store it in a variable, I'm assuming console here:
write-host "$max-$used="($max-$used)

Answer 3

I have figured out my own solution... I know it may not be the best way, but seems to work..
#http://stackoverflow.com/a/24036900/175063
$user="uuuu"
$pwd="pppp"
$source="http://1.1.1.1/manager/jmxproxy?get=java.lang:type=Memory&att=HeapMemoryUsage"
$destination="D:\Work\ps\test.xml"
$wc=new-object System.Net.WebClient
$p = New-Object System.Net.WebProxy 'http://proxy:8080'
$p.UseDefaultCredentials = $true
$wc.proxy=$p
$credCache=new-object System.Net.CredentialCache
$creds=new-object System.Net.NetworkCredential($user,$pwd)
$credCache.Add($source, "Basic", $creds)
$wc.Credentials=$credCache
$wc.DownloadFile($source, $destination)
# max=1445462016, used=898674904
# free
foreach ($thing in Get-Content $destination) {
# , max=1445462016, used=696318832})
# $a = $a.substring(2,3)
# MID: https://technet.microsoft.com/en-us/library/ee176901.aspx
# LEN: https://technet.microsoft.com/en-us/library/ee176895.aspx
# Instr: https://technet.microsoft.com/en-us/library/ee176876.aspx
$len = $thing.length
$maxst = $thing.indexof("max=")
$usedst = $thing.indexof("used=")
$max=$thing.substring($maxst+4,$len-$usedst-6)
$used=$thing.substring($usedst+5,$len-$usedst-7)
$free=$max-$used
# , max=1445462016, used=696318832})
write-host $len
write-host $maxst
write-host $usedst
write-host $max
write-host $used
write-host $free
}