Getting services with WMI and C#

[Torben Schulz]

Hello all,

I have a problem concerning a C#-program using wmi.
I want this program (as a window-service) to look all the
time, if the sql-server is still running or not.
If it has been quitted, some action shall take place.

So I need a WMI, which is listening all the running
services in a simple way, that I can easily check if sql
is among them.
My first try looks like this:

//get services
System.Management.ObjectQuery
oQuery = new System.Management.ObjectQuery("select Name
from CIM_Service");

//Execute the query
ManagementObjectSearcher oSearcher
= new ManagementObjectSearcher(oQuery);

//Get the results
ManagementObjectCollection
oReturnCollection = oSearcher.Get();

//loop through found services
foreach( ManagementObject oReturn
in oReturnCollection )
{
//Service name
Console.WriteLine ("Name : " +
oReturn["Name"] );

}

I'm sure that there is a better way, isn't it?
Could anybody give me a hint,please?

Best regards and many thanks,

Torben Schulz

[Andy Cheung [MSFT]]

Instead of polling the services yourself, it is probably more efficient if
you let WMI poll the services for you. WMI then notifies your program when
there is a change. Below is a snippet to ask WMI to poll for the state of
the Alerter service every 2 seconds, and then call my event handler when the
service state is changed to "Stopped".
class Test

{

private ManualResetEvent mre = new ManualResetEvent(false);

public void Run()

{

try

{

WqlEventQuery query = new WqlEventQuery("__InstanceModificationEvent");

query.WithinInterval = new TimeSpan(0, 0, 2); //Ask WMI to poll for
update every 2 seconds. Adjust as necessary

query.Condition = "TargetInstance ISA 'Win32_Service' AND
TargetInstance.Name='Alerter' AND TargetInstance.State='Stopped'";

Console.WriteLine("WMI event query to be executed:\n{0}",
query.QueryString);

ManagementEventWatcher watcher = new ManagementEventWatcher(query);

watcher.EventArrived += new
EventArrivedEventHandler(this.MyEventArrivedHandler);

watcher.Start();

Console.WriteLine("Listening to service event...");

this.mre.WaitOne();

watcher.Stop();

}

catch (Exception e)

{

Console.WriteLine(e);

}

}

public void MyEventArrivedHandler(object sender, EventArrivedEventArgs arg)

{

try

{

ManagementBaseObject o =
(ManagementBaseObject)arg.NewEvent["TargetInstance"];

Console.WriteLine("State of {0} service: {1}.", o["Name"],
o["State"]);

}

catch (Exception e)

{

Console.WriteLine(e);

}

finally

{

this.mre.Set();

}

}

}

--
Andy Cheung
Microsoft WMI Test Engineer
This posting is provided "As Is" with no warranties, and confers no rights.
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http://www.microsoft.com/info/cpyright.htm

"Torben Schulz" <grim...@gmx.net> wrote in message
news:046001c2f81a$dc528970$a201...@phx.gbl...

[Torben Schulz]

Hi Andy,

thank you very much for the snippet, it was very helpful.

Torben Schulz

"Andy Cheung [MSFT]" <ha...@online.microsoft.com> schrieb im Newsbeitrag
news:OJgX5cD#CHA....@TK2MSFTNGP10.phx.gbl...