Hi Nathan, I want to do is, let's say I have object:
var obj = {foo:1, bar: 2}
then pass that object to ffi function.
What is the parameter of function (in C module) should be?
Thanks ryan, let me check what'll it goes.
On Thursday, July 3, 2014 4:52:56 AM UTC+7, ryandesign wrote:
>
>
> On Jul 1, 2014, at 10:18 PM, Muhammad S Maromi wrote:
>
> > I tried the "straightforward" way, but it produces this error:
> >
> > $ node learn.js
> >
> /Users/msmaromi/learnnode/trenupp/node_modules/ffi/lib/_foreign_function.js:55
>
>
> > throw e
> > ^
> > TypeError: error setting argument 0 - writePointer: Buffer instance
> expected as third argument
> > at Object.writePointer
> (/Users/msmaromi/learnnode/trenupp/node_modules/ffi/node_modules/ref/lib/ref.js:740:11)
>
>
> > at Object.set
> (/Users/msmaromi/learnnode/trenupp/node_modules/ffi/node_modules/ref/lib/ref.js:482:13)
>
>
> > at Object.alloc
> (/Users/msmaromi/learnnode/trenupp/node_modules/ffi/node_modules/ref/lib/ref.js:514:13)
>
>
> > at Object.ForeignFunction.proxy [as tesJson]
> (/Users/msmaromi/learnnode/trenupp/node_modules/ffi/lib/_foreign_function.js:50:22)
>
>
> > at Object.<anonymous>
> (/Users/msmaromi/learnnode/trenupp/learn.js:18:9)
> > at Module._compile (module.js:456:26)
> > at Object.Module._extensions..js (module.js:474:10)
> > at Module.load (module.js:356:32)
> > at Function.Module._load (module.js:312:12)
> > at Function.Module.runMain (module.js:497:10)
>
> What do you mean exactly when you say "json object"? Do you mean a
> JavaScript object like this:
>
>
> var o = {foo: 5};
>
>
> Or do you mean a string representation of that object in JavaScript object
> notation (JSON) like this:
>
>
> var j = '{foo: 5}';
>
>
> For the latter, I would think you could pass the buffer representation of
> the string j to an ffi function. That function would need to know how to
> decode JSON-formatted strings.
>
> For the former, you would need to convert o to JSON first (e.g. using
> JSON.stringify(o)).
>
>
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