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POHow do I make sure WinSock sends to all clients?
 

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  1. POHow do I make sure WinSock sends to all clients?
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    <p>I have written a vb6 game to allow 4 players to play a card game. One of the players will host the game and the others will join.</p> <p>I used a socket array to join all of the other players with the host socket</p> <p>Everything went smooth and I am able to send messages from each player to the rest of the players, from host to guests and vice versa</p> <p>However, during the game, one player would "tell" the host that a card is chosen. The host will then send the same message to each of the clients connected to the socket array like this</p> <pre><code>For i=1 to 3 Me.SocketArray(i).SendData player.selectedCard DoEvents Next </code></pre> <p>but for some reason, one of the player never receives the message. Although the same player did receive messages before this point, and possible will receive other messages later.</p> <p>So there is a Syncing problem with what was send and what was not. I looked for answers everywhere, and some suggested to use <code>DoEvents</code> more often to force the winsock to send the data immediately.</p> <p>I then thought of implementing an inbox for each player in which each player must reply with an acknowledgment of the received message, and the host will not send any more messages until the arrival of acknowledgement, but that made the game slower and I had the same problem I had before, but this time it's not the messages that got lost, it's the acknowledgment.</p> <p>The number 1 reason I think I am having all of this is that the Winsock control sometimes sends incomplete messages (one character missing) and that will create a mess, because I need every character at the other end, otherwise the message is useless.</p> <p>How can I make sure that whenever the host sends a message, all the other guests receive ALL of it intact?</p>
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    1. USAhmad
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    1. COWhat protocol/s are you using for your messages? Winsock TCP does not lose bytes - if it did, millions of developers/users would know about it pretty quick! DoEvents is not likely to make much difference - the Windows network stack is a complex, multiThreaded OS subsystem and doesn't really care how promptly you process messages in your app.
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      1. USMartin James
    2. COI am using the default settings for the Winsock control. TCP. When I debug the code, (running multiple instances of the same code on one machine) I get all the messages intact, but when I distribute the code over multiple machines, there is always one missing character occasionally.
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      1. POHow do I make sure WinSock sends to all clients?
      1. USAhmad
    3. COWell, if your messages are short, you should set the TCP_NODELAY socket option to disable the Nagle algorithm. Also, what protocol do you use to define your messages? Are they text with a CRLF at the end, SOH/ETX or some other message-delimiting protocol?
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      1. POHow do I make sure WinSock sends to all clients?
      1. USMartin James
 

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