Get the "handle number" of a standard handle class

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Gabriel Caron L'Écuyer
How can I ...
-Get the "handle number" (like the handle number returned when using hdgetset classes(ex : 203.0024)) of a myclass object which is of a "standard" handle class (myclass<handle)
-Store this "handle number" in a text variant
-And then retrieve my original object by this "handle number"
Thanks for you help!!! Gabriel

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采纳的回答

Walter Roberson
Walter Roberson 2012-2-29
You can attach arbitrary (binary) data to a graphics object by setting its UserData property, or by using setappdata() on it.

更多回答（3 个）

Andrew Newell
Andrew Newell 2012-2-29
Setappdata seems best because of the limitations on using the UserData property (see How can I keep track of my GUI object handles?. You can store handles, as in the following example:
x = 1:10;
h = plot(x,x);
ha = @(x) x^2;
setappdata(h,'myHandle',ha)
f = getappdata(h,'myHandle');
f(2)
ans =
4
Daniel Shub
Daniel Shub 2012-2-29
You cannot do this directly. I don't understand why you would want to. Why not just pass the object around? MATLAB is pretty smart about memory management and doesn't make copies of handle object every time they are referenced.
If you really want to do it, you could subclass the handle class with something like myhandle. This new class could have a public property "h" which gets set at creation with a unique number. There are a number of ways that I can think of to keep track of the handle number to guarantee that they are unique. Then just make myclass<myhandle.
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Gabriel Caron L'Écuyer
Gabriel Caron L'Écuyer 2012-2-29
So my question was basically if an object of class Myclass<handle have a handle that can be retrieved and used to retrieve back this object like the graphics objects have.
Walter Roberson
Walter Roberson 2012-2-29
Gabriel, object handles that are not handle graphics objects, do *not* have a representation of the kind you are seeking.

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Gabriel Caron L'Écuyer
Thanks, it solved my problem. Gabriel

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