This would be a good case for using Native Addons for Node 
(nan). https://nodejs.org/api/n-api.html . You may be tempted to use the 
new C++ addons for node (https://nodejs.org/api/addons.html), but it's not 
API complete and spits annoying warnings (even with flags) so I'd suggest 
avoiding it.

The raw docs on nodejs.org are a bit hard to get started with, but I found 
this article helpful. I think it's still 
relevant. https://community.risingstack.com/using-buffers-node-js-c-plus-plus/

Also, the libsodium library has a bunch of macros that teach you how to do 
data conversion to/from 
node/C: 
https://github.com/paixaop/node-sodium/blob/master/src/include/node_sodium.h

Best,
Mikkel


On Tuesday, December 19, 2017 at 12:07:00 AM UTC-8, Mike Aubury wrote:
>
> Hi,
> I want to be able to communicate with a C program while maintaining stdio 
> streams as-is - sort of like the way NodeJS can send messages to child 
> nodejs programs.
>
> I can see in the documentation - i can use something like : 
>
>
>    spawn('prg', [], { stdio: ['pipe', 'pipe', 'pipe', 'pipe' /* extra one 
> here */] });
>
>
> But - what do i need to do on the C side to link back to that new pipe ? 
> Do I need 2 pipes (one for read, one for write)
>
> Am I better trying to do something with IPC ?
>
> Any ideas, and/or code samples would be greatly appreciated !
>
>
>

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