Sending Messages To Multiple Clients

ankhd · 2015-02-13T05:31:10

Hi. I sort of have a server running but when there is 2 or more clients the sever crashes with a Debug Assertion Fail in xstring line 78 what does that mean with in the following code. the server app will send a predefind vector of messages to all clients when a button is pressed Like so. for(UINT ctr = 0; ctr < Messages.size(); ++ctr) Lobby.deliver(Messages[ctr]); if there is only one client it seams to work. If I just send 1 message it all works can hold the send button down and it sends data no fails Lobby.deliver(Messages[0]); It must happen afer the data is sent because the 2 clients recieve the correct data. where should I look. I'm thinking it may be a race condition with the message and the async_write method. both handle_write may return at the same time. The Lobby Deliver Function . void deliver(const cMessage& msg) { //first time user of std::for_each std::for_each(Clients.begin(), Clients.end(), boost::bind(&cConnection::deliver, _1, boost::ref(msg))); } and the cConnections deliver that gets binded . void deliver(const cMessage& msg) { //the sever sends use messages by this async_write(msg, boost::bind(&cSession::handle_write, this, boost::asio::placeholders::error, shared_from_this())); } /// Handle completion of a write operation. void handle_write(const boost::system::error_code& e, cConnection_ptr client) { // Nothing to do. The socket will be closed automatically when the last // reference to the connection object goes away. std::stringstream ss; ss << "Server Handle Write Completed \n"; global_stream_lock.lock(); //send the data to the client list box SendMessage(GlobalList, (UINT)LB_ADDSTRING , 0, (LPARAM) ss.str().c_str()); global_stream_lock.unlock(); if(!e)// && read_msg_.decode_header()) { //std::cout << "Server Sent All DATA" << std::endl; ss.str(""); ss.clear(); ss << "Server Sent All DATA"; global_stream_lock.lock(); //send the data to the client list box SendMessage(GlobalList, (UINT)LB_ADDSTRING , 0, (LPARAM) ss.str().c_str()); global_stream_lock.unlock(); } else { //std::cout << "Server Send Error = " << e.message << std::endl; ss.str(""); ss.clear(); ss << "Server Send Error = " << e.message(); global_stream_lock.lock(); //send the data to the client list box SendMessage(GlobalList, (UINT)LB_ADDSTRING , 0, (LPARAM) ss.str().c_str()); global_stream_lock.unlock(); ss.str(""); ss.clear(); ss << "Lost Client\nRemoving Client = FooBar"; global_stream_lock.lock(); //send the data to the client list box SendMessage(GlobalList, (UINT)LB_ADDSTRING , 0, (LPARAM) ss.str().c_str()); global_stream_lock.unlock(); //will the lobby need to be protected by mute x lock or some other ???????????? //remove this client from the lobby its a dead client Lobby.leave(shared_from_this()); } }

Networking and Multiplayer Programming

Started by ankhd February 11, 2015 06:49 AM

9 comments, last by ankhd 9 years, 9 months ago

ankhd

Author

2,304

February 13, 2015 05:31 AM

Don't learn threads at the same time you're learning multiplayer at the same time you're learning C++ container classes and standard library.
Do one at a time!

Lol, nothing like just jumping in.

No indeed. I have done network programming I've made a winstock chat app, dplay RTS game, a new RTS and Tower version(That is waiting for a Network layer), in the past I've created all my containers from scratch I'm only now branching out, because I need to learn the hard way so I can under stand.

Wait till you her my next plan,

Producers and consumers. been ready up all day on them, Boost looks like the way to go since im now using it for networking.

I'm no where near making it yet(producer, comsumers).

I have a question on consumers and producers for a network app you would need 2 consumers and producers(all ready sick of writting them words , will refer to them as C and P).

one for the apps out going and one for incomming, am i right in that thourght.??

used like the app post a new message to producer then the thread consumes the message and then the C & P is for incomming but its in reverse the thread produces and the app comsumes it.

if I'm right there my reading has not been in vain. But the thing I can't work out is when to check incomming C & P do I create an event triggered in the thread when it adds a P.

Sending Messages To Multiple Clients

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