Question

In my console application(.NET) i am executing WMI query as follows:

ManagementObjectSearcher query;
        ObjectQuery oq;
        ManagementObjectCollection objectCollection;
        try
        {
            oq = new ObjectQuery("SELECT TotalVisibleMemorySize, FreePhysicalMemory FROM Win32_OperatingSystem");
            query = new ManagementObjectSearcher(oq);
            objectCollection = query.Get();
        }
        catch
        {
            return null;
        }
        return objectCollection;

I am doing division on the data collected to use in my application. It is working perfectly for me at the moment.
I am using multiple wmi queries for my application. In order to make a single method to execute all my wmi queries from config I will need to do the division in the select clause of query it self.
I need to execute WMI query like follows:

SELECT ((TotalVisibleMemorySize)/1024) as TotalVisibleMemorySize1, ((FreePhysicalMemory)/1024) as FreePhysicalMemory1 FROM Win32_OperatingSystem

For this query i am getting error Invalid query.
Is there a syntax mistake in this query or is it not possible to do division in the select clause of a WMi query?

Answer 1

Seems WMI doesn’t supports complex queries. Your best bet is to capture wmi results and convert as needed:

foreach (ManagementObject mo in objectCollection)
{
Console.WriteLine("Total Memory = {0} MB", 
Convert.ToInt32(mo.GetPropertyValue("TotalVisibleMemorySize"))/1024);
}