SetUIBrightnessPreference does not change the brghtness of InDesign

i want create plugin change , detect brightness of indesign cc2015 preference.

 

i have used

               interfaceptr<iapplication> application(getexecutioncontextsession()->queryapplication());

               interfaceptr<iuserinterfacepreferences> ui(application, iid_iuserinterfacepreferences);

 

here

               pmreal p = ui->getuibrightnesspreference();

but p's value null or empty. have printed informationalert, nothing there.

 

set brightness 0.33

               ui->setuibrightnesspreference(0.33);

 

but not change anything. have call applypreference... something.

better post in indesign sdk forum:

 

indesign sdk

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