How to send structure using TCP/IP socket in c++(windows)

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Hello,

I want to send structure pointer from client to server using TCP/IP socket program.
I got a guidance to type cast my pointer and send.
But it's not working.
I think I don't know the actual step to type cast structure pointer.

If you know, Please give me an idea to do it..

Thank you.

Posted 27-Jul-11 2:24am

IT-NEWBIE

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Richard MacCutchan · Answer 1 · 2011-07-27T02:55:00

It depends on the content of your structure but you need to serialize/deserialize your data, probably field by field. If both your client and server have the same "endian-ness" this is fairly simple, but if they are different then you may need to use the xtonx() functions as described here[^].

Emilio Garavaglia · Answer 2 · 2011-07-27T03:17:00

Casting the pointer is ... calling "dog" a cat.
You can actually call "dog" a cat, but it will not start barking.

Casting the pointer is ... pointless: a pointer contain just an address of the memory of your local process space. Once you transfered that address to the other machine (or process or whatever) what could it do with it?

You have to send the data (not the pointers) and reconstruct the pointers on the other side, hence "serialization" is needed.
It is time to stop and learn something more on that concept.
Not something that can fit a "quick answer".

hakz.code · Answer 3 · 2011-07-27T02:48:00

Solution 1

Hi,

I believe you are using winsock2 for socket programming,if you are using send function call in the server this is the sample code by me:

struct myStruct {
        int a,b;
    }myStruct1;
    void* myPtr = &myStruct1;
    send(client,(char*)myPtr,sizeof(myStruct1),0);

In client side code you can typecast it back to the required struct type.

Posted 27-Jul-11 2:48am

hakz.code

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Richard MacCutchan 27-Jul-11 8:51am

That will be fine as long as both client and server are big-endian or little-endiam. If they are different then you will get some interesting results.

hakz.code 27-Jul-11 9:06am

Ya true,I was just going through this page to know more :http://www.cse.iitk.ac.in/users/dheeraj/cs425/lec17.html.

How to send structure using TCP/IP socket in c++(windows)

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