Question

I want to have access in javascript to my c++ function with google v8 engine and return result according arguments giving in my javascript function.

My javascript function is as follow:

var result = MyFc(
                 {
                  'stringData':'abc',
                  'numberData':123,
                  'arrData':[1,2,3],
                  'objData':{'a':true,'b':false,'c':true},
                  'callback':function(){}
                 }
);

I used

global->Set(v8::String::New("myFc"), v8::FunctionTemplate::New(MyFc));

v8::Handle<v8::Value> MyFc(const v8::Arguments& args) {
  obj = args[0]->...
  if( obj->stringData != 'abc' ){
      //....
  }
  if( obj->numberData != 123 ){
      //....
  }
  if( obj->arrData[2] != 3 ){
      //....
  }
  if( obj->objData->b == false ){
      //....
  }
  if( obj->callback !='abc' ){
      //....
  }
}

My question is how to parse arguments object in c++ v8? I want to access to all key values of the object in arguments, values can be an number, string, array, anonymous function or object.

Answer 1

Use type checking methods of v8::Value (IsBoolean(), IsArray(), IsObject() etc) and then v8::Handle<T>::Cast(v8::Handle<S>) to cast args[i] values to corresponding types.

Your code should look like this:

if (args[0]->IsArray()) {
    Handle<Array> array = Handle<Array>::Cast(arg[0]);
    for (int i = 0; i < array->Length(); i++) {
       //...
    }
}
if (args[1]->IsObject()) {
    Handle<Object> object = Handle<Object>::Cast(args[i]);
    Handle<Value> fieldValue = object->Get(String::New("a"));
    Handle<Value> callback = object->Get(String::New("callback"));
    if (callback->IsFunction()) {
        Handle<Function> fn = Handle<Function>::Cast(callback);
    }
}