Hello,
I try to use the std.socket to send data from a client to a "server". Up to now i managed to get a connection and to send strings and chars of text but i am not able to send and receive floats or other types of numbers...
Maybe anyone knows how to do that?
the socket-command only accepts void[] and i have no idea how to make an array from the 4 bytes that a float has...

Thanks for any help,
sorry for my engrish...

Charma

Charma escribió:
> Hello,
> I try to use the std.socket to send data from a client to a "server". Up to now i managed to get a connection and to send strings and chars of text but i am not able to send and receive floats or other types of numbers...
> Maybe anyone knows how to do that?
> the socket-command only accepts void[] and i have no idea how to make an array from the 4 bytes that a float has...
> 
> Thanks for any help,
> sorry for my engrish...
> 
> Charma

Maybe std.socketstream has what you're looking for?

-- 
Carlos Santander Bernal

Charma wrote:
> Hello,
> I try to use the std.socket to send data from a client to a "server". Up
> to now i managed to get a connection and to send strings and chars of
> text but i am not able to send and receive floats or other types of
> numbers...
> Maybe anyone knows how to do that?
> the socket-command only accepts void[] and i have no idea how to make an
> array from the 4 bytes that a float has...
> 
> Thanks for any help,
> sorry for my engrish...
> 
> Charma
well there's always the cheap way to do it
void socksend(T)(Socket s, T value) { s.send((cast(void
*)&T)[0..T.sizeof]); }

Note that this will break utterly for reference types and arrays, but
you get the basic idea. It would probably be possible to make an
extended version via static if that handles arrays correctly (deep
copying), but I'm too lazy. :p
 --downs

Downs wrote:
> well there's always the cheap way to do it
> void socksend(T)(Socket s, T value) { s.send((cast(void
> *)&T)[0..T.sizeof]); }
> 
Arrgh. Sorry. Clicked "send" without rereading.
Naturally, it has to be &value.
 --downs

Downs wrote:
> Charma wrote:
> 
>>Hello,
>>I try to use the std.socket to send data from a client to a "server". Up
>>to now i managed to get a connection and to send strings and chars of
>>text but i am not able to send and receive floats or other types of
>>numbers...
>>Maybe anyone knows how to do that?
>>the socket-command only accepts void[] and i have no idea how to make an
>>array from the 4 bytes that a float has...
>>
>>Thanks for any help,
>>sorry for my engrish...
>>
>>Charma
> 
> well there's always the cheap way to do it
> void socksend(T)(Socket s, T value) { s.send((cast(void
> *)&T)[0..T.sizeof]); }
> 
> Note that this will break utterly for reference types and arrays, but
> you get the basic idea. It would probably be possible to make an
> extended version via static if that handles arrays correctly (deep
> copying), but I'm too lazy. :p
>  --downs

I've got a template that does deep copies of ragged arrays to a buffer that can then be reconstructed on the other end of a pipe.

Almost no docs, no type checking, haven't used it with dmd >~0.160, and I forget how to make it work... so have fun ;)

struct Array
{
   uint start;
   uint length;
}

T[] MakeArray(T)(Array head, byte[] buf)
{
   if(head.start + head.length*T.sizeof > buf.length)
    throw new ArrayConstructionError("Array mapping exceeded buffer");
   return (cast(T*)&buf[head.start])[0..head.length];
}

template TArray(T)
{
 // data: what to send
 // meta: generated meta data
 // buf: array of buffers containing data
 // i: size of all of buf data
 Array Load(T[] data,inout Array[] meta,inout byte[][] buf,inout uint i)
 {
  Array ret;
  static if(is(typeof(data[0][0])))
  {
   ret.start = meta.length;
   ret.length = data.length;
   meta.length = meta.length + data.length;
   foreach(int j, a;data)
    meta[ret.start+j]=TArray!(typeof(data[0][0])).Load(a,meta, buf, i);
  }
  else
  {
   ret.start = i;
   ret.length = data.length;
   buf ~= (cast(byte*)data.ptr)[0..data.length*T.sizeof];
   i += buf[$-1].length;
  }
  return ret;
 }

 // buf: cat of buf's from Load
 T[] UnLoad(Array arr, Array[] meta, byte[] buf)
 {
  static if(is(typeof(T[0])))
  {
   T[] ret;
   ret.length = arr.length;
   foreach(int j, a; meta[arr.start..arr.start+arr.length])
    ret[j] = TArray!(typeof(T[0])).UnLoad(a,meta, buf);
   return ret;
  }
  else
   return MakeArray!(T)(arr, buf);
 }
}

Carlos Santander schrieb:
> Charma escribió:
>> Hello,
>> I try to use the std.socket to send data from a client to a "server". Up to now i managed to get a connection and to send strings and chars of text but i am not able to send and receive floats or other types of numbers...
>> Maybe anyone knows how to do that?
>> the socket-command only accepts void[] and i have no idea how to make an array from the 4 bytes that a float has...
>>
>> Thanks for any help,
>> sorry for my engrish...
>>
>> Charma
> 
> Maybe std.socketstream has what you're looking for?
> 


Yes thank you, that was exactly what i was looking for... Stupid me... Well, everything works perfectly now.

Thanks a lot!