How to obtain data from WMI using a C Application?

Question

I have a pure C application that issues IOCTL calls to my adapter driver and displays info ,this is however compiled using Visual Developer Studio 5(non-managed code) ... I

Answer 1

Another option, if you want to keep the impact to your existing C application low, is to write a DLL that internally can use C++ and COM wrapper classes to query the desired WMI information.

This DLL can provide a plain C interface to adapt to your application. Thats the way I would go for.