Re: [lwip-users] netbuf_data() netconnwrite() problem

[Francois Bouchard]

Ok, but the incoming netbuf says it's 10 bytes.  I tried your suggestion to
change length from 10B to 20B  (as u8_t  to u16_t) but it does not help; I
dont receive the good data.

 if(netbuf_data(inbuf, (void*)&buf, &buflen) == ERR_OK)
     {
         netconn_write(conn, buf, buflen, NETCONN_NOCOPY);
     }

This code works for a string ie. it sends exactly the same thing.  But for
ushorts I can't manage them.  Maybe I'll stick to strings ... and change the
client test program.

Thanks

Francois

----- Original Message -----
From: <address@hidden>
To: "Mailing list for lwIP users" <address@hidden>
Sent: Monday, February 16, 2009 12:22 PM
Subject: Re: [lwip-users] netbuf_data() netconnwrite() problem


> Francois Bouchard wrote:
> > Ok, I think that the cast is the good thing to do (I got exemple that
> > does that).
> >
> > But that does'nt fix my problem.  The client application sends 10
> > unsigned short, then the server is supposed to send back the 10 u16_t
> > var, but it retransmits half of the data.  The length of the pBuf is
> > 10; but is it 10 octets?  If so that is why I get half of my data back.
> >
> > Hope it's not confusing
> It is, a little. But with the pbuf length you are right: both p->len and
> p->tot_len are byte counters. When sending 10 ushorts, you have to set
> the size of data to send to the correct amount.
>
> E.g. when sending an array: tcp_write(.., (void*)ushort_array,
> 10*sizeof(ushort), ...)
>
> or when executing 10 individual writes: tcp_write(.., (void*)an_ushort,
> sizeof(ushort), ...)
>
> Simon
>
>
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