Check if push button has an image on it or not

I have a bunch of push button where the user can put pictures on but how do I check if the push button has an image on it or not? Below is the code I thought would work but wouldn't. Any help is greatly appreciated.

if (handles.pushbutton1,'cdata',[]) || (handles.pushbutton2,'cdata',[])
     msgbox('There are still empty tiles')
end

Answer 1

[Michael Haderlein]

You need to use get and isequal:

if isequal(get(handles.pushbutton1,'cdata'),[]) || isequal(get(handles.pushbutton2,'cdata'),[])
%...
end

[Hao Wei Low]

Thank you!