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How to convert C struct from mxArray pointer of structs?

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If I have in C file
struct FooInner {
double Bar;
int32 Baz;
struct Foo {
struct FooInner inner;
which is called via Matlab SDK C Compiler with following code:
if (mlxDo_smth_api(n_out, out, n_in, in))
mxArray *fooArrPtr = mxGetData(out[0]);
for (int i = 0; i < 100; i++)
struct FooInner *fooInnerPtr = (struct FooInner *) mxGetPr(fooArrPtr);
printf("Bar = %f, baz = %d\n", fooInnerPtr->Bar, fooInnerPtr->Baz);
then I'm getting random numbers. I know how to parse a single struct fields from Matlab (need to mxGetData and cast it to proper struct field data type), however, how to do with array of structs? I can't increment fooArrPtr as well -- giving me error that I can't increment mxArray.
  2 Commenti
James Tursa
James Tursa il 8 Ago 2022
Modificato: James Tursa il 8 Ago 2022
Where is out[0] coming from? Unless you have something very strange going on, it looks like you are mixing mxArray struct types with native C struct types, which I wouldn't expect to work. That is, the result of the mxGetData(out[0]) might be an mxArray pointer if out[0] is a an mxArray cell or struct, but then the result of the mxGetPr(fooArrPtr) call I would definitely not expect to be a native C struct type. Hence my question.
Sabyrzhan Tasbolatov
Sabyrzhan Tasbolatov il 8 Ago 2022
I'm gathering information from Matlab function like
function [output] = MyFunc(in1, in2)
output = struct('inner', {}, 'smth', {})
output{ii}.inner = inner_result
Thanks for pointing out not to mix mxArray with C struct. Will reformat to collect result into flatten array of values, rather than array of structs for output.

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