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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