Dear All,
I have an issue that I can't seem to see addressed fully, apologies in
advance if this has already been posted.
Here is the issue:
given a C function that I compile with emcc:
int allocatearray(float** array,int* parray_size){
array_size=rand(10);
float* array= (float*) malloc(array_size);
*parray_size=array_size;
*parray=array;
}
this function allocates an array for which I do not initially know the
size, hence cannot be done on the
js side, only the c side knows how to handle the allocation.
I would like to be able to create a js array that is allocated insize the
"c" function allocatearray:
i.e: I would like to write the following code:
var allocated_array;
var allocated_array_size;
AllocateArray = Module.cwrap('allocate_array','number',['number','number']);
but I don't seem to understand how using the module heap I could retrieve
the allocated_array
and its size, how would the call even look like?
AllocateArray(&allocate_array, & allocated_array_size); ? //that's not
javascript! but that's what I would like to write
I could try and build a pointer in the module heap, and pass that on to the
AllocateArray module, but I need to pass
a pointer to a pointer if I want to be able to allocate it. How do you
create a NULL pointer in javascript, and get
it allocated within the c function?
I have seen a lot of documentation on how to pass a pointer from js to C,
but here, it's different, I want to pass
a NULL pointer from js to C, have C allocate it, and return it to js.
I would appreciate any help on the issue, thanks a lot in advance!
Eric
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