How can a C function return a local array in M?

[Kurt Le Breton]

Hi all,

I'm working on a system where M is currently used to parse JSON input into a local array structure. My current M implementation processes about 2MB/sec, which is about all I can squeeze out of M, but I'm hoping to increase performance by rewriting the parser in C.

What I’d like to do is have a C function that returns a fully populated local array in M. Something like:

s *nodes = $zjson("{""json"":""object string here""}")

I’m looking at the documentation on how to setup an external C library, but I’m not sure how it’s possible to return a local variable array from C back into M.

Is there any way to do this? Has anyone done something similar, or would this require modifying YottaDB itself?

Any guidance or ideas welcome.

Thanks,
Kurt

[Sam Habiel]

Kurt,

If you are talking about YottaDB, there is an MR in progress that does what I think you want:

https://gitlab.com/YottaDB/DB/YDB/-/merge_requests/1663

> Is there any way to do this? Has anyone done something similar, or would this require modifying YottaDB itself?

Yes, it can be done via the C API: https://docs.yottadb.com/MultiLangProgGuide/cprogram.html#simple-api.

--Sam

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[Kurt Le Breton]

Thanks Sam,

Yes I was thinking specifically about YottaDB, I'll be more specific next time.
Thanks for the direction to use simple api, I'll give it a closer look.