Monitor based on PowerShell occasionally show ExitCode -1 when Launch a Process

Question

good dat every one.
I have encounter some problem.
i need to monitor status of a programm (HP OM Agent). i write a ps script wich launch a process ovc.exe, then i parse output.
in ISE all is ok. bhut when i use this script in monitor(s) i occasionally got ExitCode -1 (but monitored program is fine).
here is my code
## <![CDATA[
# functions chapter
function KillChildProcs {
$CProcId = ([System.Diagnostics.Process]::GetCurrentProcess()).Id
$ChProcs = Get-WmiObject -Class Win32_Process -Filter "ParentProcessID=$CProcId"
if ($ChProcs){
foreach ($ChProc in $ChProcs ){
"Child Process PID is " + $ChProc.ProcessId + " and its name is " + $ChProc.path
"Killing this proc"
kill $ChProc.ProcessId -Force
}else {
"No child process"
# init SCOM vars
$Result = 0
$Description = $null
$msgaError = $null
$agtPath = $null
$strLBinDir=$null
$ProcessInfo=$null
$Process=$null
$msgaSts=$null
$api=$null
$bag=$null
$api = New-Object -comObject 'MOM.ScriptAPI'
$api.LogScriptEvent('ChkOMAgtBuffState.ps1', 47, 4, "chk OMAgtBuff started")
# run opcmsga.exe - status and check it output
try{
# getting agent path
try{
$agtPath = (Get-Item 'Registry::HKLM\SOFTWARE\Hewlett-Packard\HP OpenView').GetValue('InstallDir')
}catch{
$ErrorMessage = $_.Exception.Message
$FailedItem = $_.Exception.ItemName
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"Cant get HP Agent Path from regestry, fallback to default "+$ErrorMessage)
$Description = $Description + "ERROR getting Agent Path from Regestry : "+$ErrorMessage + "`r`n"
}finally{
if (!$agtPath){ $agtPath = "DefPath"}
#try to launch opcmsga.exe
try{
$strLBinDir = $agtPath + "lbin\eaagt"
$ProcessInfo = New-Object System.Diagnostics.ProcessStartInfo
$ProcessInfo.FileName = $strLBinDir + "\opcmsga.exe"
$ProcessInfo.RedirectStandardError = $true
$ProcessInfo.RedirectStandardOutput = $true
$ProcessInfo.UseShellExecute = $false
$ProcessInfo.Arguments = "-status"
$Process = New-Object System.Diagnostics.Process
$Process.StartInfo = $ProcessInfo
$Process.Start() | Out-Null
if ($Process.WaitForExit(12000)){
"ExitCode = " + $Process.ExitCode
if ($Process.ExitCode -eq 0){
$msgaSts = $Process.StandardOutput.ReadToEnd()
if ($msgaSts -like '*Message Agent is not buffering*'){
$Result=0
$Description = $Description +$msgaSts +"`r`n"
}else{
$Result=1
$Description = $Description + $msgaSts +"`r`n"
}else{
$Result=1
$Description = $Description + "ERROR : opcmsga.exe return error Exit Code is "+$Process.ExitCode+ "Error Output is " + $Process.StandardError.ReadToEnd() + "`r`n"
} else{
$Result=1
$Description = $Description + "ERROR : opcmsga.exe Timeout" + $Process.StandardError.ReadToEnd() + "`r`n"
$Process.close()
}catch{
$ErrorMessage = $_.Exception.Message
$FailedItem = $_.Exception.ItemName
$Result=1
$Description = $Description + "ERROR launching opcmsga.exe " + $ErrorMessage + "`r`n"
}finally{
$api.LogScriptEvent('ChkOMAgtBuffState.ps1', 47, 4, "COM object created")
$bag = $api.CreatePropertyBag()
$api.LogScriptEvent('ChkOMAgtBuffState.ps1', 47, 4, "Bag created")
$bag.addvalue("Result", $Result)
$bag.addvalue("Description", $Description)
$api.LogScriptEvent('ChkOMAgtBuffState.ps1', 47, 4, "Bag set " + $bag)
$bag
}catch{
}finally{
$Result
$Description
#clearing Varibles
KillChildProcs
Remove-variable Result
Remove-variable Description
Remove-variable msgaError
Remove-variable agtPath
Remove-variable strLBinDir
Remove-variable ProcessInfo
Remove-variable Process
Remove-variable msgaSts
Remove-variable api
Remove-variable bag
## ]]>
and another one
##<![CDATA[
#function declaration
function KillChildProcs {
$CProcId = ([System.Diagnostics.Process]::GetCurrentProcess()).Id
$ChProcs = Get-WmiObject -Class Win32_Process -Filter "ParentProcessID=$CProcId"
if ($ChProcs){
foreach ($ChProc in $ChProcs ){
"Child Process PID is " + $ChProc.ProcessId + " and its name is " + $ChProc.path
"Killing this proc"
kill $ChProc.ProcessId -Force
}else {
"No child process"
$Process=$null
$matches=$null
$bag=$null
$Description=$null
$regexp = "(?<Process>^\w+)(?:\s+)(?<Description>(?:\w+)(?:(?:\s\w+){1,}))(?:\s+)(?<Type>\w\S+)(?:\s+)(?<PID>\S+)(?:\s+)(?<Status>\w+$)"
$ErrorMessage=$null
$FailedItem=$null
$agtPath =$null
$isRegexped=$null
$ovcError=$null
$api = New-Object -comObject 'MOM.ScriptAPI'
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"Script Started")
try{
$agtPath = (Get-Item 'Registry::HKLM\SOFTWARE\Hewlett-Packard\HP OpenView').GetValue('InstallDir')
}catch{
$ErrorMessage = $_.Exception.Message
$FailedItem = $_.Exception.ItemName
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"Cant get HP Agent Path from regestry, fallback to default "+$ErrorMessage)
$Description = $Description + "ERROR getting Agent Path from Regestry : "+$ErrorMessage + "`r`n"
$agtPath = "DefPath"
$ProcessInfo = New-Object System.Diagnostics.ProcessStartInfo
$ProcessInfo.FileName = "ovc.exe"
$ProcessInfo.RedirectStandardError = $true
$ProcessInfo.RedirectStandardOutput = $true
$ProcessInfo.StandardOutputEncoding=[System.Text.Encoding]::GetEncoding("windows-1252")
$ProcessInfo.UseShellExecute = $false
$ProcessInfo.Arguments = "-status"
$Process = New-Object System.Diagnostics.Process
$Process.StartInfo = $ProcessInfo
# Creating string builders to store stdout and stderr.
$StdOutBuilder = New-Object System.Text.StringBuilder
$StdErrBuilder = New-Object System.Text.StringBuilder
# Adding event handers for stdout and stderr.
$action = {
if (! [String]::IsNullOrEmpty($EventArgs.Data)) {
$Event.MessageData.AppendLine($EventArgs.Data)
#declare stdErr and stdOut Events
$StdOutEvent = Register-ObjectEvent -InputObject $Process -Action $action -EventName 'OutputDataReceived' -MessageData $StdOutBuilder
$StdErrEvent = Register-ObjectEvent -InputObject $Process -Action $action -EventName 'ErrorDataReceived' -MessageData $StdErrBuilder
try{
$Process.Start() | Out-Null
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"ovc started ")
$Process.BeginOutputReadLine()
$Process.BeginErrorReadLine()
$Process.WaitForExit()
# Removing and unregistering events to retieve process output.
Remove-Event -SourceIdentifier $StdOutEvent.Name -EA SilentlyContinue
Remove-Event -SourceIdentifier $StdErrEvent.Name -EA SilentlyContinue
Unregister-Event -SourceIdentifier $StdOutEvent.Name
Unregister-Event -SourceIdentifier $StdErrEvent.Name
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"StdOut is " +$StdOutBuilder.ToString())
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"ErrOut " +$StdErrBuilde.ToString())
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"ExitCode is " +$Process.ExitCode)
$StdOut = $StdOutBuilder.ToString().split("`r`n");
$StdErr = $StdErrBuilder.ToString().split("`r`n");
$ExitCode = $Process.ExitCode
if($ExitCode -eq 0){
foreach ($ab in $StdOut){
$isRegexped = $ab -match $regexp
if($isRegexped){
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"got output line" +$line)
if ($matches['Status'] -ne "Running") {$Result=1}
$Description = $Description + $matches['Process']+"`t"+$matches['Status'] + "`r`n"
$matches=$null
}else{
$api.LogScriptEvent('chkOMAgt.ps1',88,4,"ExitCode is" +$ExitCode)
$api.LogScriptEvent('chkOMAgt.ps1',88,4,"StdOut is" +$StdOut)
$Description = $Description + 'ovc exited with errors'+ "`r`n" + $StdErr
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"ovc exited with errors")
$Result=1
}catch{
$ErrorMessage = $_.Exception.Message
$FailedItem = $_.Exception.ItemName
$Result=1
$Description = $Description + "ERROR parsing ovc.exe " + $ErrorMessage + "`r`n"
$Process.close()
if ($Result -ne 1){$Result=0}
$Description
$Result
$bag = $api.CreatePropertyBag()
$bag.addvalue("Result" , $Result)
$bag.addvalue("Description" , $Description)
$bag
$api.LogScriptEvent('chkOMAgt.ps1',48,4,"Script Finished `r`nResult ="+$Result+"`r`nDescription is `r`n"+$Description)
#"cleaning child process and remove varibles"
KillChildProcs
Remove-Variable regexp
Remove-Variable Result
Remove-Variable Description
Remove-Variable ovcError
Remove-Variable isRegexped
Remove-Variable ProcessInfo
Remove-Variable Process
Remove-Variable matches
Remove-Variable bag
## ]]>

Answer 1

I have no data in stdOut nor in ErrOut.
when i simulate error i got ExitCode greater than 0 and error description
but in real life some times script work fine and ovc put in stdout some data but sometime inside the  monitor this script throw ExitCode -1 and no output at all.
in that time i call ovc in RDP session and it was work ok. 
i tried to change $ProcessInfo.FileName
=
"ovc.exe" to
cmd /c ovc.exe but all in vain