internal IWbemServices GetIWbemServices()
{
// Lets start by assuming that we'll return the RCW that we already have
IWbemServices localCopy = wbemServices;
// Get an IUnknown for this apartment
IntPtr pUnk = Marshal.GetIUnknownForObject(wbemServices);
// Get an 'IUnknown RCW' for this apartment
Object unknown = Marshal.GetObjectForIUnknown(pUnk);
// Release the ref count on the IUnknwon
Marshal.Release(pUnk);
// See if we are in the same apartment as where the original IWbemServices lived
// If we are in a different apartment, give the caller an RCW generated just for their
// apartment, and set the proxy blanket appropriately
if (!object.ReferenceEquals(unknown, wbemServices))
{
// We need to set the proxy blanket on 'unknown' or else the QI for IWbemServices may
// fail if we are running under a local user account. The QI has to be done by
// someone who is a member of the 'Everyone' group on the target machine, or DCOM
// won't let the call through.
SecurityHandler securityHandler = GetSecurityHandler();
securityHandler.SecureIUnknown(unknown);
// Now, we can QI and secure the IWbemServices
localCopy = (IWbemServices)unknown;
// We still need to bless the IWbemServices in this apartment
securityHandler.Secure(localCopy);
}
return(localCopy); // STRANGE: Why does it still work if I return 'wbemServices'?
}
internal IWbemServices GetIWbemServices()
{
IWbemServices wbemServices = this.wbemServices;
IntPtr iUnknownForObject = Marshal.GetIUnknownForObject(this.wbemServices);
object objectForIUnknown = Marshal.GetObjectForIUnknown(iUnknownForObject);
Marshal.Release(iUnknownForObject);
if (!object.ReferenceEquals(objectForIUnknown, this.wbemServices))
{
SecurityHandler securityHandler = this.GetSecurityHandler();
securityHandler.SecureIUnknown(objectForIUnknown);
wbemServices = (IWbemServices)objectForIUnknown;
securityHandler.Secure(wbemServices);
}
return(wbemServices);
}