So basically when you're calling "ref.refType(pst_block_recorder)",
pst_block_recorder is still undefined. I ran into this problem with a
struct that libffi uses, and the solution is to progressively create
the struct instance using the "defineProperty()" function. Try
something like this:
var pst_block_recorder = Struct();
pst_block_recorder.defineProperty('next', ref.refType(pst_block_recorder));
pst_block_recorder.defineProperty('offset', 'int64');
pst_block_recorder.defineProperty('size', 'size_t');
pst_block_recorder.defineProperty('readcount', 'int');
On Thu, Aug 23, 2012 at 7:53 AM, rhasson <[email protected]> wrote:
> Nathan,
>
> I started using node-ffi which works great. I need to create some structs
> so I'm using ref-struct. Now some of my structs have pointers to themselves
> like this:
>
> typedef struct pst_block_recorder {
> struct pst_block_recorder *next;
> int64_t offset;
> size_t size;
> int readcount;
> } pst_block_recorder;
>
> I tried to recreate this with ref-struct like this:
> var pst_block_recorder = Struct ({
> //struct pst_block_recorder *next;
> 'next': ref.refType(pst_block_recorder),
> //int64_t offset;
> 'offset': 'int64',
> //size_t size;
> 'size': 'size_t',
> //int readcount;
> 'readcount': 'int'
> });
>
> But I get the following error:
> assert.js:102
> throw new assert.AssertionError({
> ^
> AssertionError: could not determine a proper "type" from: undefined
> at Object.coerceType (/home/roy/node_modules/ref/lib/ref.js:389:3)
> at Object.refType (/home/roy/node_modules/ref/lib/ref.js:304:23)
>
>
> I also tried making those struct fields "pointer" types but the C library
> doesn't seem to populate them correctly.
>
> Any thoughts?
>
> Thanks,
> Roy
>
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