Re: [Vala] gio: how to read N bytes into a buffer at offset M?

[Evan Nemerson <evan coeus-group com>]

On Tue, 2011-12-20 at 00:39 -0800, Matto Marjanovic wrote:
> Hi,
>
> The subject line explains what I am trying to do.  In plain old C,
> I would simply use plain old libgio:
>
>     GInputStream* s = ...;
>     guint8 buffer[4096];
>     GError* error = NULL;
>     ...
>     g_input_stream_read(s, buffer + M, N, NULL, &error);
>
> How do I do this in Vala?
>
> The 0.12 GIO bindings seemed to allow this, since read() and related methods
> took a 'string' buffer parameter and a separate 'size_t' count parameter.
>
> The 0.14 bindings, however, only all take a uint8[] parameter, and magically
> derive the read size from the (full) array size.  Is there some other magic
> syntax I am supposed to use to access to the functionality of the underlying
> C API?

Use array slicing. Something like stream.read (buffer[M:M + N]);


-Evan