struct to ubyte[] or ubyte[] to struct for d language

Question

How the implementation of the struct in the D language to ubyte [] or ubyte [] to the struct, please brothers help answer this question, thank you!

If a struct contains the string or char [] what to do?

For example, such a structure:

struct UserLogin 
{ 
    align(1): 
      ushort ClientId; 
      int AccectId; 
      string LoginUid; 
      string LoginPwd; 
} 

Attention to my application in the socket!

Doreathadoreen

For real serialization see the existing answers. Otherwise a reinterpret cast is what you want, something like (cast(ubyte*)var)[0..UserLogin.sizeof] – Polemic

Answer 1

To convert the raw data, the suggested idiom is like this:

struct_type* s = new struct_type;
ubyte[] ub = cast(ubyte[]) s[0..1];
struct_type* s2 = cast(struct_type*) ub.ptr;

This will not handle serialization of strings and pointers, though. You will need to do that manually or with a library.

Hephzipa

Answer 2

I don't think there's anything in the standard library to automatically serialize and deserialize structures to byte streams. std.stream does that for a variety of basic types, but not entire structs. Apache Thrift support is on the way. Among 3rd-party solutions, you can have a look at the Orange serialization library.

Goby

I think Orange will make it into phobos. – Polemic

Answer 3

@Dev Wolf : You have to write serialization/deserialization yourself. Apart from the Orange mentioned by CyberShadow you also have the Thrift protocol implementation : http://klickverbot.at/code/gsoc/thrift/ . I remember some guys worked on Google Protocol Buffer implementation as well.

Memphis

Answer 4

struct UserLogin
{
  align(1): 
  ushort ClientId; 
  int AccectId; 
  char[10] LoginUid; 
  char[10] LoginPwd; 
}

UserLogin* readByteToStruct = cast(UserLogin*)ne.data;

Will be able to properly take the data...

Doreathadoreen