Query the service control manager using the Windows crate

sample.rs

fn main() -> Result<()> {
    unsafe {
        let scm = OpenSCManagerA(None, None, GENERIC_READ);
        let service = OpenServiceA(scm, "Fax", GENERIC_READ);

        let mut buffer_size = 0;

        QueryServiceStatusEx(
            service,
            SC_STATUS_PROCESS_INFO,
            std::ptr::null_mut(),
            0,
            &mut buffer_size,
        );

        let mut buffer = Vec::new();
        buffer.resize(buffer_size as _, 0);

        if !QueryServiceStatusEx(
            service,
            SC_STATUS_PROCESS_INFO,
            buffer.as_mut_ptr(),
            buffer_size,
            &mut buffer_size,
        )
        .as_bool()
        {
            return Err(HRESULT::from_thread().into());
        }

        let info = buffer.as_ptr() as *const SERVICE_STATUS_PROCESS;
        println!("{:#?}", *info);
        Ok(())
    }
}