It’s pretty old-school, but often my solution for this is to pipe text output
of ChucK
into stdin of the Cxx program in a terminal. You need to be sure to send to
chout
and not just use the <<< “PRINT THIS” >>>; form, because the latter prints to
stderr, not stdout. Here’s a simple ChucK program that writes a random number
to stdout every 16 ms. Below that is a very simple C program to read and
report.
You’d need to have your C++ program read from stdin and use the argument(s)
accordingly. You’d invoke the whole thing like this:
> chuck MyChucK.ck | myCProgram
where myCProgram is your compiled C++ executable.
// MyChucK.ck ChucK Program to write random numbers to stdout
while (true) {
16::ms => now;
chout <= Std.ftoa(Math.random2f(0.0,3.14159),4); // 4 decimal places
chout <= "\n"; // newline
chout.flush(); // be sure and do this!!
}
// END OF CHUCK PROGRAM TO WRITE FLOATS
// myCProgram.c a C Program to read single floats from Stdin
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main() {
char inString[256];
float inVal;
while (1) {
fgets(inString,256,stdin); // read standard input
inVal = atof(inString); // peel off float value
inString[strlen(inString)-1] = 0; // kill the newline
printf("Got it!! %s, %f\n", inString, inVal); // report!!
}
return 1;
}
// END C PROGRAM TO READ FLOATS
> On May 10, 2016, at 2:09 PM, chuck-users-requ...@lists.cs.princeton.edu wrote:
>
> 1. Communicate with a C++ programme (Guille Elias Alonso)
> 2. Re: Communicate with a C++ programme (Stephen D Beck)
> 3. Re: Communicate with a C++ programme (Guille Elias Alonso)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 10 May 2016 22:53:48 +0200
> From: Guille Elias Alonso <guille_elias_alo...@hotmail.com>
> To: "chuck-users@lists.cs.princeton.edu"
> <chuck-users@lists.cs.princeton.edu>
> Subject: [chuck-users] Communicate with a C++ programme
> Message-ID: <dub125-w7866df5cbf0938708fb36cb3...@phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello guys,
> I'm writing a programme that analyses the micro input and makes some actions
> according to the analysis. Everything about the analysis is written in Chuck.
> The analysis of the micro signal gives a single number every 16 ms, and this
> number has to be sent to the C++ programme but I don't know how I can connect
> the two parts. This application is highly time-sensitive so I need a fast way
> of communicating.
> I had read about these OSC events but it seems it's only for Chuck programmes
> receiving input from the outside and I want just the opposite. I've also
> thought about some mechanism of shared memory between the Chuck programme and
> the C++ programme but I don't see anywhere some way of implementing that with
> Chuck. Do you have any ideas?
> Thanks,Guillermo
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