[Numpy-discussion] Pointers to arrays in C

Lisandro Dalcin dalcinl@gmail....
Tue Jun 3 12:08:56 CDT 2008


I believe in your current setup there is no better way. But you should
seriously consider changing the way of using array data. Storing bare
pointers in the C side and not holding a reference to the object
providing the data in the C side is really error prone.


On 6/3/08, Jose Martin <maitai02@excite.com> wrote:
>
>  Hi, I read a file with array data (one per line), and send the arrays to a module in C. In the C module, I need to store pointers to the arrays, so I don't have to make a copy for each array it receives from python.
>
>  I found that if I reuse the same variable name to create the array, the pointer's values in C program will be lost next time the variable is reassigned.
>
>  For example:
>  - for line in file:
>   - myarray=create an int array from line
>   - my_c_module.function(myarray)
>
>  'myarray' is reused to create a new array for each line, however I see that the data in myarray in previous loops (which is stored in C program) is destroyed.
>
>  To avoid this, I create a python list that appends each 'myarray' instances, and thus are not overwritten. Is there a better approach to avoid this?
>
>  Thanks in advance!
>
>
>
>
>
>
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-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
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