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digitalmars.D.learn - Send and receive in socket

reply Charma <Motoko_Kusanagi web.de> writes:
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
Aug 15 2007
next sibling parent reply Carlos Santander <csantander619 gmail.com> writes:
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
Aug 15 2007
parent Charma <Motoko_Kusanagi web.de> writes:
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!
Aug 15 2007
prev sibling parent reply Downs <default_357-line yahoo.de> writes:
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

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
Aug 15 2007
next sibling parent Downs <default_357-line yahoo.de> writes:
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]); }
 

Naturally, it has to be &value. --downs
Aug 15 2007
prev sibling parent BCS <BCS pathlink.com> writes:
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); } }
Aug 15 2007