Get the "handle number" of a standard handle class

Question

Gabriel Caron L'Écuyer 2012-2-29

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30603-get-the-handle-number-of-a-standard-handle-class

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2012-2-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30603-get-the-handle-number-of-a-standard-handle-class#answer_39160

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Andrew Newell 2012-2-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30603-get-the-handle-number-of-a-standard-handle-class#answer_39161

在 MATLAB Online 中打开

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 3

Daniel Shub 2012-2-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30603-get-the-handle-number-of-a-standard-handle-class#answer_39077

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.

6 个评论
显示 4更早的评论隐藏 4更早的评论

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.