
258 Part IV: Classes
Refreshing the Data
When you perform a query into the performance-monitor counters, you might find illuminat
ing results, but you cannot trend the data. If you loop through the counters without refreshing
the data, you simply repeat the presentation of the information over and over again—certainly
not a very useful operation. However, if you can go back to WMI and reload the data, you will
have updated data to present to your script.
For example, if I want the capability of refreshing the WMI da
ta available to my script, I must
create a refresher object. The refresher object is called SWbemRefresher, and basically it