| Accessing class structure fields outside the class [message #90973] |
Tue, 19 May 2015 13:12  |
evan.jones@richmond.e
Messages: 1
Registered: May 2015
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Junior Member |
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Hello everyone. I would like to access field values in class structures outside their class.
For example:
Pro class1__define
struct = {class1, value:5, pointer:new_ptr(3)}
end
Pro main
a = {class1}
print, a.value, *a.pointer
end
This approach 'zeros' the values inside class1's structure and turns any pointers into a null pointer. Is there a way to access the field values in class1's struct outside the class? Among other reasons, I want to accomplish this without having class1's structure be defined in main so that other methods, functions, and procedures can operate on the field values as they change during a calculation
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| Re: Accessing class structure fields outside the class [message #90974 is a reply to message #90973] |
Tue, 19 May 2015 13:28  |
Russell[1]
Messages: 101
Registered: August 2011
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Senior Member |
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You're making a few mistakes here.
The class prototype (your class1__define), only defines the datatypes of the class fields. So the fact that you use "value:5" is irrelevant, since this procedure simply defines class1 as a named structure that will contain field named "value" which is an integer. Similarly, you have a field named "pointer" which is a pointer data type.
You will need to explicitly initialize the data. In your example this would be:
pro class1__define
foo = {CLASS1, value:0, pointer: ptr_new()}
end
pro main
a={class1,5,ptr_new(4.)}
print, a.value, *a.pointer
end
Hope this helps.
Russell
On Tuesday, May 19, 2015 at 4:12:28 PM UTC-4, evan....@richmond.edu wrote:
> Hello everyone. I would like to access field values in class structures outside their class.
>
> For example:
>
> Pro class1__define
> struct = {class1, value:5, pointer:new_ptr(3)}
> end
>
> Pro main
> a = {class1}
> print, a.value, *a.pointer
> end
>
> This approach 'zeros' the values inside class1's structure and turns any pointers into a null pointer. Is there a way to access the field values in class1's struct outside the class? Among other reasons, I want to accomplish this without having class1's structure be defined in main so that other methods, functions, and procedures can operate on the field values as they change during a calculation
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| Re: Accessing class structure fields outside the class [message #90975 is a reply to message #90973] |
Tue, 19 May 2015 13:30 |
Matthew Argall
Messages: 286
Registered: October 2011
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Senior Member |
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On Tuesday, May 19, 2015 at 2:12:28 PM UTC-6, evan....@richmond.edu wrote:
> Hello everyone. I would like to access field values in class structures outside their class.
>
> For example:
>
> Pro class1__define
> struct = {class1, value:5, pointer:new_ptr(3)}
> end
>
> Pro main
> a = {class1}
> print, a.value, *a.pointer
> end
>
> This approach 'zeros' the values inside class1's structure and turns any pointers into a null pointer. Is there a way to access the field values in class1's struct outside the class? Among other reasons, I want to accomplish this without having class1's structure be defined in main so that other methods, functions, and procedures can operate on the field values as they change during a calculation
You can have your class inherit IDL_Object:
http://exelisvis.com/docs/IDL_Object.html
See the "IDL_Object and Property Access" section on this page:
http://exelisvis.com/docs/WhatsNew_in_8_0.html
Also, look at "Automatic Class Structure Definition" on this page:
http://exelisvis.com/docs/creating_an_object_class_1.html
You are nearly there.
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