Howdy.

I'm currently using gdc (should I switch to dmd? What would that provide me?)

and the following should be functional but it isn't:

I create a UDP socket, Address family is INET, I create the address as my loopback on the given port.

I bind.  Blocking returns true, isAlive returns true.  So I'm blocking, I'm alive, and then I hit receiveFrom which should block until I have something to read.  That falls right through.  :-(

I searched high and low for working examples of client-server programs (you can refer me to those too if they exist) to no avail.  I sure hope this is a boneheaded mistake on my part.

Thanks for any insight,
Joe

import std.socket;
import std.stdio;

void main() {

  UdpSocket       sock     = new UdpSocket(AddressFamily.INET);
  InternetAddress sockAddr = new InternetAddress("127.0.0.1", 3001);

  writefln("%s", sockAddr.toString());

  sock.bind(sockAddr);

  if (sock.blocking()) {
    writefln("Socket is blocking");
  }
  if (sock.isAlive()) {
    writefln("Socket alive");
  }

  ubyte[] buf;
  Address receiveAddress;
  int bytes;

  bytes = sock.receiveFrom(buf, receiveAddress);

  if (bytes) {
    writefln("Received %d bytes", bytes);
  } else {
    writefln("Error or nothing received");
  }

}

Joseph Bell wrote:
> Howdy.
> 
> I'm currently using gdc (should I switch to dmd? What would that provide me?)
> 
> and the following should be functional but it isn't:
> 
> I create a UDP socket, Address family is INET, I create the address as my loopback on the given port.
> 
> I bind.  Blocking returns true, isAlive returns true.  So I'm blocking, I'm alive, and then I hit receiveFrom which should block until I have something to read.  That falls right through.  :-(
> 
> I searched high and low for working examples of client-server programs (you can refer me to those too if they exist) to no avail.  I sure hope this is a boneheaded mistake on my part.
> 
> Thanks for any insight,
> Joe
> 
> import std.socket;
> import std.stdio;
> 
> void main() {
> 
>   UdpSocket       sock     = new UdpSocket(AddressFamily.INET);
>   InternetAddress sockAddr = new InternetAddress("127.0.0.1", 3001);
> 
>   writefln("%s", sockAddr.toString());
> 
>   sock.bind(sockAddr);
> 
>   if (sock.blocking()) {
>     writefln("Socket is blocking");
>   }
>   if (sock.isAlive()) {
>     writefln("Socket alive");
>   }
> 
>   ubyte[] buf;
>   Address receiveAddress;
>   int bytes;
> 
>   bytes = sock.receiveFrom(buf, receiveAddress);
> 
>   if (bytes) {
>     writefln("Received %d bytes", bytes);
>   } else {
>     writefln("Error or nothing received");
>   }
> 
> }

Joseph,

Here's a great resource for you: http://beej.us/guide/bgnet/output/htmlsingle/bgnet.html

- Kris

On Wed, 24 Jan 2007 01:09:52 -0500, Joseph Bell <josephabell@tx.rr.com> wrote:
[snip]

>    ubyte[] buf;
>    Address receiveAddress;
>    int bytes;
>
>    bytes = sock.receiveFrom(buf, receiveAddress);
>
>    if (bytes) {
>      writefln("Received %d bytes", bytes);
>    } else {
>      writefln("Error or nothing received");
>    }
>
> }

Give it some memory to write into...  buf = new ubyte[1000];
and then buf[0 .. bytes] is valid, assuming no errors.

Thanks Chris - that indeed was the trick - I haven't delved deep enough into D to know if my expectation of being able to pass an unbounded array has any merit.  Suffice it to say, this works - thank you.

Chris Miller wrote:
> On Wed, 24 Jan 2007 01:09:52 -0500, Joseph Bell <josephabell@tx.rr.com> wrote:
> [snip]
> 
>>    ubyte[] buf;
>>    Address receiveAddress;
>>    int bytes;
>>
>>    bytes = sock.receiveFrom(buf, receiveAddress);
>>
>>    if (bytes) {
>>      writefln("Received %d bytes", bytes);
>>    } else {
>>      writefln("Error or nothing received");
>>    }
>>
>> }
> 
> Give it some memory to write into...  buf = new ubyte[1000];
> and then buf[0 .. bytes] is valid, assuming no errors.