public static extern uint MsiGetComponentStateW(MSIHANDLE hInstall, [NativeTypeName("LPCWSTR")] ushort *szComponent, INSTALLSTATE *piInstalled, INSTALLSTATE *piAction);
 public static extern uint MsiGetFeatureStateW(MSIHANDLE hInstall, [NativeTypeName("LPCWSTR")] ushort *szFeature, INSTALLSTATE *piInstalled, INSTALLSTATE *piAction);