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Passing a pointer via the data argument #651
Description
I have been messing around with objects and functions.
Napi::Value position(const Napi::CallbackInfo& info) {
float* a = (float*) info.Data();
return Napi::Number::New(info.Env(), a);
}
void myClass::getStuff(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
float* a = new float(As<Napi::Number>().FloatValue());
Napi::Function cb = info[3].As<Napi::Function>();
auto function1 = Napi::PropertyDescriptor::Function("function1", function1, napi_default, a);
Napi::Object obj = Napi::Object::New(env);
obj.DefineProperties({ function1 });
cb.Call(env.Global(), { obj });
}
When I try to call function1 in javascript, I get nothing. I was able to verify that (int*) info.Data() returns nullptr even though I passed a pointer to an integer on the heap. Am I doing this wrong? How should I approach this?
Activity
KevinEady commentedon Jan 18, 2020
Hi @f-s-plus-plus ,
I noticed that our CI tests do not include a test for a function property descriptor with user data. I have since created a PR to add one. Take a look at the files changed, maybe that will help?
alexisfrjp commentedon Feb 3, 2020
Can be done using External, example: #584
gabrielschulhof commentedon Feb 3, 2020
@sauleanf please have a look at #652, which adds a test to ensure that passing external data to a binding works correctly. The test can also serve as an example of how to do that. If you are still having trouble, please feel free to re-open this issue or open a new one!