Node Buffer to char数组

时间:2015-01-27 13:17:40

标签: c++ node.js v8 node.js-addon

我有一个原生的NodeJS插件,它接受Buffer个实例作为其中一个参数。

我可以使用以下代码将char数组转换为Buffer,但要寻找相反的方法。

static v8::Local<v8::Object> create_buffer(char *data, unsigned long length) {
  node::Buffer *slow_buffer = node::Buffer::New(length);
  memcpy(node::Buffer::Data(slow_buffer), data, length);

  v8::Handle<v8::Value> constructor_arguments[3] = {
    slow_buffer->handle_,
    v8::Integer::New(length),
    v8::Integer::New(0)
  };

  v8::Local<v8::Object> global_object = v8::Context::GetCurrent()->Global();
  v8::Local<v8::Function> buffer_constructor = v8::Local<v8::Function>::Cast(global_object->Get(v8::String::New("Buffer")));

  return buffer_constructor->NewInstance(3, constructor_arguments);
}

1 个答案:

答案 0 :(得分:5)

也许我迟到了,但下面的代码应该有效:

#include <node.h>
#include <node_buffer.h>

void Test(const FunctionCallbackInfo<Value>& args)
{
  Local<Object> bufferObj = args[0]->ToObject();
  char* bufferData = node::Buffer::Data(bufferObj);
  size_t bufferLength = node::Buffer::Length(bufferObj);
}

参考:

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