Le jeudi 10 mars 2016 à 23:34 +0530, MohanR a écrit :
> Hi,
>
> May be a i'm wrong, but here is my issue,
>
> namespace test {
> struct Remote {
> uint16 id;
> uint32 ip;
> }
> class SocketReader: Object {
> Socket socket;
> Array remotes;
> public SocketReader(Socket socket) {
> this.socket = socket;
> this.remotes = new Array();
> }
> public read() {
> int8[] buffer = new int8[sizeof(Remote)];
> while(socket.receive(buffer,
> sizeof(Remote)) > 0) {
> Remote* remote = Memory.dup(buffer,
> sizeof(Remote));
> this.remotes.append_val(remote);
> }
> }
> }
> }
>
> when read() goes out-of-scope, "buffer" gets freed, So I have to
> make a dup of that memory to store it in "remotes" array. But If I
> have some way to tell vala not to free buffer, I dont need to dup the
> buffer.
>
> Am I doing this right? or any better way? All I need is to get the
> data
> coming from the socket and use it as "Remote" struct. Need your
> suggestions.
>
> Thanks,
> Mohan R
You should read directly in the memory allocated for the 'Remote'
struct instead of using a temporary buffer. I think it's correct to
cast it to uint8[].
socket.receive ((uint8[]) remote);
remotes.append_val (remote);
However, your code is likely incorrect, because 'Socket.receive' states
that it will read up to 'buffer.length', so you may end with a partial
read.
You need to loop with an offset, something like:
size_t offset = 0;
while (offset < sizeof (Remote)
offset += socket.receive ((uint8[] remote) [offset:sizeof
(Remote) - offset]);
Unless you are doing something very specific, use SocketService, it has
a much simpler interface:
http://valadoc.org/#!api=gio-2.0/GLib.SocketService
The SocketConnection is an IOStream, so you have access to
input_stream.read_all, which will perform a complete read for the
requested buffer size.
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