The number of messages on an MSMQ via Powershell

I'd like to provide a queuepath and get the number 开发者_如何转开发of messages thereupon. Any advice on how this could be done?

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This will list all queues on a machine and the number of messages:

gwmi -class Win32_PerfRawData_MSMQ_MSMQQueue -computerName $computerName |
    ft -prop Name, MessagesInQueue

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PowerShell under Windows Server 2012/2012 R2 and Windows 8/8.1 has a bunch built-in Cmdlets that can be used by installing the Microsoft Message Queue (MSMQ) Server Core feature.

# Get all message queues
Get-MsmqQueue;

# Get all the private message queues.
# Display only the QueueName and MessageCount for each queue.
Get-MsmqQueue -QueueType Private | Format-Table -Property QueueName,MessageCount;

There is a number of other Cmdlets that can be used for queue management and message creation. i.e.

• New-MsmqQueue
• Remove-MsmqQueue
• Send-MsmqQueue
• Receive-MsmqQueue
• Get-MsmqQueueManager

For the full list of MSMQ Cmdlet help see MSMQ Cmdlets in Windows PowerShell, or Get-Command -Module MSMQ if you already have the feature installed.

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So, I saw this: What can I do with C# and Powershell? and went here:http://jopinblog.wordpress.com/2008/03/12/counting-messages-in-an-msmq-messagequeue-from-c/

And made this

# Add the .NET assembly MSMQ to the environment.
[Reflection.Assembly]::LoadWithPartialName("System.Messaging")

# Create a new QueueSizer .NET class help to warp MSMQ calls.
$qsource = @"
public class QueueSizer
    {
        public static System.Messaging.Message PeekWithoutTimeout(System.Messaging.MessageQueue q, System.Messaging.Cursor cursor, System.Messaging.PeekAction action)
        {
            System.Messaging.Message ret = null;
            try
            {
                // Peek at the queue, but timeout in one clock tick.
                ret = q.Peek(new System.TimeSpan(1), cursor, action);
            }
            catch (System.Messaging.MessageQueueException mqe)
            {
                // Trap MSMQ exceptions but only ones relating to timeout. Bubble up any other MSMQ exceptions.
                if (!mqe.Message.ToLower().Contains("timeout"))
                {
                    throw;
                }
            }
            return ret;
        }

        // Main message counting method.
        public static int GetMessageCount(string queuepath)
        {
            // Get a specific MSMQ queue by name.
            System.Messaging.MessageQueue q = new System.Messaging.MessageQueue(queuepath);

            int count = 0;

            // Create a cursor to store the current position in the queue.
            System.Messaging.Cursor cursor = q.CreateCursor();

            // Have quick peak at the queue.
            System.Messaging.Message m = PeekWithoutTimeout(q, cursor, System.Messaging.PeekAction.Current);

            if (m != null)
            {
                count = 1;

                // Keep on iterating through the queue and keep count of the number of messages that are found.
                while ((m = PeekWithoutTimeout(q, cursor, System.Messaging.PeekAction.Next)) != null)
                {
                    count++;
                }
            }

            // Return the tally.
            return count;
        }
    }
"@

# Add the new QueueSizer class helper to the environment.
Add-Type -TypeDefinition $qsource -ReferencedAssemblies C:\Windows\assembly\GAC_MSIL\System.Messaging\2.0.0.0__b03f5f7f11d50a3a\System.Messaging.dll

# Call the helper and get the message count.
[QueueSizer]::GetMessageCount('mymachine\private$\myqueue');

And it worked.

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The solution provided by Irwin is less than idea.

There is a .GetAllMessages call you can make to have this done in one check, instead of a foreach loop.

$QueueName = "MycomputerName\MyQueueName" 
$QueuesFromDotNet =  new-object System.Messaging.MessageQueue $QueueName


If($QueuesFromDotNet.GetAllMessages().Length -gt $Curr)
{
    //Do Something
}

The .Length gives you the number of messages in the given queue.

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following the presciptions from this link, you can use

$queues = Get-WmiObject Win32_PerfFormattedData_msmq_MSMQQueue
$queues | ft -property Name,MessagesInQueue

to get the size of the local queues, or

$host = ...
$cred = get-credential
$queues = Get-WmiObject Win32_PerfFormattedData_msmq_MSMQQueue -computer $host -credential $cred
$queues | ft -property Name,MessagesInQueue

for remote queues.

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There are a set of MSMQ management cmdlets in the PowerShell Community Extensions. Give these a try and see if any of them help (probably Get-MSMQueue):

Clear-MSMQueue
Get-MSMQueue
New-MSMQueue
Receive-MSMQueue
Send-MSMQueue
Test-MSMQueue

Note: Try grabbing the beta 2.0 module-based distrubtion - just remember to "unblock" the zip before unzipping it.

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Use this for your c# block to get the count. It uses performance counter to query a single time:

public static int GetMessageCount(string machineName, string queuepath)
    {
        var queueCounter = new PerformanceCounter(
            "MSMQ Queue",
            "Messages in Queue",
            string.Format("{0}\\{1}", machineName, queuepath),
            machineName);

        return (int)queueCounter.NextValue();
    }

This is more efficient than a repetitive peek, as the work is mostly done on the remote machine, also more efficient than GetAllMessages, as this returns additional message data, then counts the elements - terrible performance at any real load.

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I have been hunting high and low for information on accessing queues in a cluster.

For others trying to use powershell commands on clustered queues:

On one of the cluster nodes:

$env:computername = "MsmqHostName"
Get-MsmqQueue | Format-Table -Property QueueName,MessageCount

remote from the cluster:

Invoke-Command -ScriptBlock {$env:computername = "msmqHostName";Get-MsmqQueue | Format-Table -Property QueueName,MessageCount } -ComputerName ClusternNodeName

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Try one of these...

function GetMessageCount2($queuename)
{
    $queuename = $env:computername + "\" + $queuename
    return (Get-WmiObject Win32_PerfFormattedData_msmq_MSMQQueue | Where-Object -filterscript {$_.Name -eq $queuename}).MessagesinQueue 
}

function GetMessageCount3($queuename)
{
    return (Get-MsmqQueue | Where-Object -FilterScript {$_.QueueName -eq $queuename}).MessageCount
}

---

I was looking for a good answer to this, and while Irwin's answer put me on the right basis I was looking for some code that was a bit more Powershell-ish. The main reason for that is to deal with changes, as you can't Add-Type multiple times due to the type being loaded in the .Net runtime, and can't be unloaded without closing your powershell instance.

So I took his answer and came up with:

# Add the .NET assembly MSMQ to the environment.
[Reflection.Assembly]::LoadWithPartialName("System.Messaging") | out-Null

function Get-QueueNames([Parameter(Mandatory=$true)][String]$machineName, [String]$servicePrefix)
{
    [System.Messaging.MessageQueue]::GetPrivateQueuesByMachine($machineName) |
        ForEach-Object { $_.Path } | 
        Where-Object { $_ -like "*$($servicePrefix).*" } 
}

function Get-MessageCount([parameter(Mandatory=$true)][String]$queueName)
{
    function HasMessage
    {
        param
        (
            [System.Messaging.MessageQueue]$queue,
            [System.Messaging.Cursor]$cursor,
            [System.Messaging.PeekAction]$action
        )

        $hasMessage = $false
        try
        {
            $timeout = New-Object System.TimeSpan -ArgumentList 1
            $message = $queue.Peek($timeout, $cursor, $action)
            if ($message -ne $null)
            {
                $hasMessage = $true
            }
        }
        catch [System.Messaging.MessageQueueException]
        {
            # Only trap timeout related exceptions
            if ($_.Exception.Message -notmatch "timeout")
            {
                throw
            }
        }

        $hasMessage
    }

    $count = 0
    $queue = New-Object System.Messaging.MessageQueue -ArgumentList $queueName
    $cursor = $queue.CreateCursor()

    $action = [System.Messaging.PeekAction]::Current
    $hasMessage = HasMessage $queue $cursor $action
    while ($hasMessage)
    {
        $count++
        $action = [System.Messaging.PeekAction]::Next
        $hasMessage = HasMessage $queue $cursor $action
    }

    $count
}

$machineName = "."
$prefix = "something"

Get-QueueNames $machineName $prefix |
    ForEach-Object {
        New-Object PSObject -Property @{
            QueueName = $_
            MessageCount = Get-MessageCount $_
        }
    }

It can be optimized so that the first function returns queues instead of the queue names, but I needed both for different scenarios.

---

winrm s winrm/config/client '@{TrustedHosts="yourIp"}'
$securePassword = ConvertTo-SecureString "YourPassword" -AsPlainText -force
$credential = New-Object System.Management.Automation.PsCredential("Domain\Usernama",$securePassword)  
$session = New-PSSession YourIP -credential $credential
$command = {Get-WmiObject Win32_PerfFormattedData_msmq_MSMQQueue | ft -property Name,MessagesinJournalQueue,MessagesInQueue | out-String} 
Invoke-Command -session $session -scriptblock $command

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This worked for me

[System.Reflection.Assembly]::LoadWithPartialName("System.Messaging") | Out-Null

$AlertCount = 39

$queuePath = ".\private$\test.pdpvts.error"

$queue = New-Object System.Messaging.MessageQueue $queuePath


If($queue.GetAllMessages().Length -gt $AlertCount)
{
    Send-MailMessage -To "Me" -From "Alerts" -Subject "Message queue is full" -Credential mycridentials -UseSsl -SmtpServer mail.google.com
}