Hi Edward,
Consider a double pointer like a matrix (in algebra) witch one you don't
know its dimension a priori.
An example: put the case that we are developing an application witch
calculates the inverse of a matrix of dimensions NxM. The values of N
and M will be determinated by the user and they are unknown a priori. If
so, we declare a doble pointer:
float **ptr;
The application asks to the user the values of of the number of files
(N) and columns (M), and according to them it reserves the "necessary
and sufficient" memory:
ptr = (float**) malloc(files* sizeof(float*);
for (i=0; i<files; i++)
ptr[i] = (float*) malloc(columns*sizeof(float));
Once the application has calculated the resulting inverse matrix MxN, we
must delete the memory *manually*.
Aitor.
On 11/09/15 10:35, Edward Bartolo <edb...@gmail.com> wrote:
Hi all,
Since yesterday I have been trying to understand why "char**
essid_list" is working inside getInstalledEssidList(&count,
essid_list) but failing as soon as I try to access essid_list[0]
outside the function.
Both the source and the gdb text output are attached.
Any helpful pointers are appreciated.
_______________________________________________
Dng mailing list
Dng@lists.dyne.org
https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
