Send std::map objet via TCP socket

[Nouri2015]

Hello,
I want to send an object std::map via socket tcp,,is this possible!!!
Thanks in advance

[yeye_olive]

The first thing you need is a way to serialize a map (compute a representation of the map as a stream of bytes) and deserialize it (rebuild the map from this representation). If I were you, I would first experiment with serialization/deserialization in memory; then I would worry about sending this sequence of bytes through a socket.

AFAIK there is no standard library support for (de)serialization. There are some well-established libraries to help you with this, such as Boost.Serialization. Or, if you can replace your std::map with a QMap, you can serialize it to/deserialize it from a QDataStream; all you need is to make sure the key and value types are (de)serializable.

Note that even if you use a std::map (and therefore need to implement (de)serialization code yourself), you could still serialize to a QDataStream, and benefit from its platform- and architecture-independent encoding of the basic C++ types.

So, to help you get started, here is a proposal with questions/things to do:

1. Does your program absolutely need to manipulate a std::map, or can you replace it with a QMap?
2. If you need a std::map, then write two generic functions to (de)serialize it to(from) a QDataStream.
3. What are the key and value types of your map?
4. Write the serialization/deserialization functions for QDataStream for those two types, if they do not already exist.

[Nouri2015]

I sould you use C++ without Qt
So i peref to use std::map ans send <ked, data>
Do you have any idea how to reorganise received data from the client side!!
Form information I will send binaire image from the server to the cleitn
thanks in advance

[kaufenpreis]

This should work but only if message class is POD. If there are pointers or other not POD classes (string, vector) inside, it won't work.

[yeye_olive]

Here are a few questions to help us understand the context.

• You wrote that you did not want to use Qt. What libraries are you working with?
• Are you only writing the program sending the std::map, or the receiver too?
• Does the data you send need to adhere to a specific format/protocol, or can you choose your own?
• What experience do you have with (de)serialization and network application development?
• What have you already tried to solve your problem?