如何将v8值转换为数组 [英] How to convert v8 Value to Array

问题描述

我正在为v8编写一个c ++扩展，并希望将一个Array对象传递给它。我看到传入的参数可以通过IsArray（）测试，但没有ToArray（）。

I'm writing a c++ extension to v8, and want to pass an Array object into it. I see the incoming argument can be tested by IsArray(), but there isn't a ToArray().

如何访问它的长度，

Handle<Value> MyExtension(const Arguments& args)
{
    Handle<Value> v = args[0];
    if(v->IsArray())
    {
        // convert to array, find its length, and access its members by index... ?
    }
...
}

明显这里。对象可以返回它的所有属性，但这不是我所希望的。

Must be missing something obvious here. Object can return all its properties, but that's not quite what I was hoping for. Is there a way to get it as an Arrray?

感谢您阅读。

推荐答案

我找不到一种方法来转换或转换为数组。也许有一种方法。但我发现通过做 object-> IsArray（）， object-> get（length） - > Uint32Value code>和 object-> get（int），我只需要遍历数组。

I wasn't able to find a way to convert or cast to Array. Maybe there's a way. But I found by doing object->IsArray(), object->get("length")->Uint32Value(), and object->get(int), I could just walk the array.

v8::Handle<v8::Object> obj;
// ... init obj from arguments or wherever ...

int length = 0;
if(obj->IsArray())
{
    length = obj->Get(v8::String::New("length"))->ToObject()->Uint32Value();
}

for(int i = 0; i < length; i++)
{
    v8::Local<v8::Value> element = obj->Get(i);
    // do something with element
}

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