v8 node buffer of unsigned chars

Question

My knowledge / experience of C is quite limited but I'm trying to create a node addon that uses a node buffer with a C call which expects the buffer to be of type 'unsigned char*' but from what I can see the node buffer Data method provides a 'char*' so the types are incompatible. E.g.

This is how it would be called using c:

int length = 100;
unsigned char buf[length];
int ret = ftdi_read_data(&ftdic, buf, length);

And from what I have read, to use a node buffer you do the following instead:

int length = 100;
node::Buffer *slowBuffer = node::Buffer::New(length);
int ret = ftdi_read_data(&ftdic, node::Buffer::Data(slowBuffer), length);

However this returns the following error when building:

error: invalid conversion from ‘char*’ to ‘unsigned char*’ [-fpermissive]
int ret = ftdi_read_data(&ftdic, node::Buffer::Data(slowBuffer), length);

Is it possible to create a node buffer of type unsigned chars, or achieve this in some other way?

Thanks

Raymond Connell · Accepted Answer · 2014-12-14 16:37:50Z

3

In your addon C code use a cast like this: (unsigned char*)node::Buffer::Data(slowBuffer). This is the usual fix for the specific error shown.

answered Dec 14, 2014 at 16:37

Raymond Connell

462 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

v8 node buffer of unsigned chars

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related