A question about UDP packet receive

[Reeze]

Hi, everyone.
I need your help!
I created a UDP server by using $socket =
stream_socket_s erver($udpAddr, $errno, $errstr, STREAM_SERVER_B IND);
the client send me a reqest, then server return a "hello string".
but the client simply send me a name or something very short. I have
to read upto 100 chars, then the fread can return.

my Question is: how can I read a udp packet which length is unknow?

thank a lot!
Reeze.




my src code:========== =============== ============
$pkt = stream_socket_r ecvfrom($socket , 100, 0, $peer);

$reciv_data = fread($socket, 100);
$message = preg_replace("/[[:space:]]/", '', $reciv_data); // cleanup
data
$response = "hello, $message";
stream_socket_s endto($socket, $response, 0, $peer);

echo " In [$message] \n";
echo " Out [$response] \n";

[=?UTF-8?B?SXbDoW4gU8OhbmNoZXogT3J0ZWdh?=]

Re: A question about UDP packet receive

Reeze wrote:

I have to read upto 100 chars, then the fread can return.
>
my Question is: how can I read a udp packet which length is unknow?

Guess what: fread() returns when it has read as many characters as
requested, OR when it hits an end-of-file.

And, guess what: when the server closes the connection, that is interpreted
as an end-of-file.

You should be able to work out the solution with this info. Alternatively,
RTFM: http://php.net/stream_get_contents

Cheers,
--
----------------------------------
Iván Sánchez Ortega -ivan-algarroba-sanchezortega-punto-es-

You fill a much-needed gap.

[Tim Roberts]

Re: A question about UDP packet receive

Reeze <reeze.xia@gmai l.comwrote:

>
I need your help!
I created a UDP server by using $socket =
>stream_socket_ server($udpAddr , $errno, $errstr, STREAM_SERVER_B IND);
the client send me a reqest, then server return a "hello string".
but the client simply send me a name or something very short. I have
>to read upto 100 chars, then the fread can return.
>
>my Question is: how can I read a udp packet which length is unknow?
>...
>my src code:========== =============== ============
> $pkt = stream_socket_r ecvfrom($socket , 100, 0, $peer);
>
> $reciv_data = fread($socket, 100);
> $message = preg_replace("/[[:space:]]/", '', $reciv_data); // cleanup
>data
> $response = "hello, $message";
> stream_socket_s endto($socket, $response, 0, $peer);
>
> echo " In [$message] \n";
> echo " Out [$response] \n";

I suggest that you use EITHER stream_socket_r ecvfrom OR fread. Both serve
the same purpose in this case, but fread adds another level of buffering.
It doesn't sound like you really want the buffering.
--
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.