Using WQL to Limit Results on a String Match

Question

I'm working on developing a WMI query for my application. It needs to find the assigned virtual COM port for a given VID/PID. My query currently looks like this:

"SELECT DeviceID FROM Win32_SerialPort WHERE PNPDeviceID = \"USB\\VID_10C4&PID_EA60\\0001\""

Based on my research, it should return "COM8". However, I'm getting an empty set.

Are string comparisons valid in WQL? As I recall, SQL allows them, but being a subset, I'm not sure if support for them was carried over.

If necessary, I suppose I can query "SELECT DeviceID,PNPDeviceID FROM Win32_SerialPort" and then in code parse through the results using string compares, but I'd prefer to limit the results in the query, if possible.

Additionally, I was wondering, if string compares are indeed supported in WQL, are they case sensitive, and/or is there a way to specify case?

Thanks.

Answer 1

I used this (C#):

"Select * From Win32_SerialPort Where PnPDeviceId = \"PCI\\\\VEN_14F1&DEV_2F30&SUBSYS_205D14F1&REV_01\\\\4&1F7DBC9F&0&10F0\""

I needed to escape the backslashes once for WMI's sake and once again for C#'s sake, so I ended with quadruple backslashes in the query.