Is there a existing way to get access to a class instance structure while having access only to the object handle??

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David Conway 2013-3-29

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Hello, I am new to OOP, GUI's and Matlab. With that upfront, I am developing a GUI using classes I've developed. I have a callback routine like this:

set(ebDx.eBx,'Callback',{@ebDx_Callback,handles});
...
...
[end of main]
function ebDx_Callback(objH,~,handles)
objH.classMethod  % this crashes... I am assigning a field to a struct

My question: is there an easy way to get access to the structure for which objH is the handle (a double).

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Walter Roberson 2013-3-29

Is ebDx.eBx a handle to an edit box, or a handle to a class? If it is a handle to a class, then how is the Callback getting activated? If it is a handle to an edit box, then where does the class come into this?

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Answer 1

Sean de Wolski 2013-3-29

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s = get(objH) %?

Perhaps you could show a minimal class that throws the error. Also, have you seen Steve's blog on GUIs made with classes?

http://blogs.mathworks.com/steve/

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David Conway 2013-3-29

Sean,

Thanks for the quick response. However, I have tried that. That function returns the properties associated with the graphics object, edit box, in this case, and not the structure variable associated with the class instance: tag, value, string, etc.

Sean de Wolski 2013-3-29

Huh, I'm not clear? Please provide a minimal working example. Perhaps a simple class with one figure and editbox.

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Answer 2

Darik 2013-3-29

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It looks to me like ebDx is a handle object, and ebDx.eBx is a uicontrol handle? (Those are awful variable names, by the way)

If that's the case, you want something like

set(ebDx.eBx,'Callback',@(uicontrol_handle, event)ebDx_Callback(ebDx, uicontrol_handle, event, handles))
function ebDx_Callback(object_handle, uicontrol_handle, ~,handles)
object_handle.classMethod (...)