catching wmi error when query fails

Hi,

I have the following:

try{

wmiobj = locmachine.ExecQuery("Select * from Win32_NTLogEvent Where
Logfile = 'Security' And TimeWritten >= '" + dtmStartDate + "' and
TimeWritten < '" + dtmEndDate + "'");
}catch(err){
wmiobj=null;
}
WScript.Echo(String(wmiobj));

running as a WSF JavaScript, unfortunately when I run it and the query
doesn't return anything it doesn't raise an error, so wmiobj does not
get set to null

How do I set it to null if the query does not provide a usable return?

If the query is written correctly it will not fail, it is returning nothing,
basically an empty collection. You can check the Count on "wmiobj", if it
is equal to 0 then you can go ahead an set it to null.

Thanks,
Jonathan

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"pantagruel" <rasmussen.bryan@gmail.com> wrote in message
news:bccfc8b1-85fc-4907-b3bc-0bf5b98f6f43@d2g2000pra.googlegroups.com...

> Hi,
>
> I have the following:
>
> try{
>
> wmiobj = locmachine.ExecQuery("Select * from Win32_NTLogEvent Where
> Logfile = 'Security' And TimeWritten &gt;= '" + dtmStartDate + "' and
> TimeWritten &lt; '" + dtmEndDate + "'");
> }catch(err){
> wmiobj=null;
> }
> WScript.Echo(String(wmiobj));
>
> running as a WSF JavaScript, unfortunately when I run it and the query
> doesn't return anything it doesn't raise an error, so wmiobj does not
> get set to null
>
> How do I set it to null if the query does not provide a usable return?
>