Cannot pass function as parameter to JX_CallFunction

[helmutkian]

When I pass a JXValue with a type of RT_Function as a parameter to JX_CallFunction, it somehow gets transformed into a number.

// ...
JXValue callback;
JXValue fn;
JXValue result;

JX_Evaluate("(function (x) { console.log(x); })", "", &callback);
JX_Evaluate("(function (cb) { console.log(typeof cb); console.log(cb); cb('test'); })", "", &fn);
JX_CallFunction(&fn, &callback, 1, &result);
// ...

What I expect to see is

function
[object Function]
test

What I actually see is

number
102789

And the final line doesn't execute because it's attempting to call a number as if it was a function.

Any idea why this is? Am I doing something wrong?

[karaxuna]

JX_CallFunction expects array as second argument. Please try this way:

JXValue params[1] = { callback };
JX_CallFunction(&fn, params, 1, &result);

[helmutkian]

#include <stdbool.h>
#include "jx.h"

int main(int argc, char **argv)
{
  JXValue cb;
  JXValue fn;
  JXValue out;

  char *contents = "console.log('Engine started');";

  JX_InitializeOnce("");
  JX_InitializeNewEngine();
  JX_DefineMainFile(contents);

  JX_StartEngine();

  JX_Loop();

  JX_Evaluate("(function (x) { console.log(x); })", "", &cb);
  JX_Evaluate("(function (cb) { console.log(typeof cb); console.log(cb); cb('test'); })", "", &fn);

  JXValue params[1] = { cb };
  JX_CallFunction(&fn, params, 1, &out);

  JX_Loop();

  JX_Free(&cb);
  JX_Free(&fn);
  JX_Free(&out);

  JX_StopEngine();

  return 0;  
}

Compiled and dynamically linked against libjx.so on Linux:

gcc -std=c99 -L <path>/jxcore-0.3.1.0/out/Release/ -I <path>/jxcore-0.3.1.0/src/public/ -Wall -o test test.c -l jx

Where <path> stands fro the leading path.

Same result:

number 
0

EDIT:

Thought maybe using C was the problem. Compiled with g++

g++ -L <path>/jxcore-0.3.1.0/out/Release/ -I <path>/jxcore-0.3.1.0/src/public/ -Wall -o test test.c -l jx

Doesn't fix anything.

[karaxuna]

You are passing "" as script parameter. Try:

JX_Evaluate("(function (x) { console.log(x); })", "eval", &cb);
JX_Evaluate("(function (cb) { console.log(typeof cb); console.log(cb); cb('test'); })", "eval", &fn);

[obastemur]

By default JX_CallFunction wasn't considering function as a value type. This is sort of both bug and feature request.

However, @helmutkian Thanks for the details cfb3cd3 fixes the issue.