Send data to server

[Vizuall]

Hello,

 

I would like to know, how to send a data from client to server. The situation is I have some setting on client and I need to share them with a server.

 

Thanks

[Choonster]

Use the Simple Network Implementation to send data between the client and server.

[Vizuall]

Yes, I tried that, but I got an exception.

 

[16:33:18] [Server thread/ERROR] [FML]: FMLIndexedMessageCodec exception caught
java.lang.RuntimeException: Missing
    at net.minecraftforge.fml.server.FMLServerHandler.getClientToServerNetworkManager(FMLServerHandler.java:288) ~[FMLServerHandler.class:?]
    at net.minecraftforge.fml.common.FMLCommonHandler.getClientToServerNetworkManager(FMLCommonHandler.java:545) ~[FMLCommonHandler.class:?]
    at net.minecraftforge.fml.common.network.FMLOutboundHandler$OutboundTarget$8.selectNetworks(FMLOutboundHandler.java:245) ~[FMLOutboundHandler$OutboundTarget$8.class:?]
    at net.minecraftforge.fml.common.network.FMLOutboundHandler.write(FMLOutboundHandler.java:293) ~[FMLOutboundHandler.class:?]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:658) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:716) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:651) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:112) ~[MessageToMessageEncoder.class:4.0.23.Final]
    at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116) ~[MessageToMessageCodec.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:658) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:716) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:706) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:741) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:895) ~[DefaultChannelPipeline.class:4.0.23.Final]
    at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:240) ~[AbstractChannel.class:4.0.23.Final]
    at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.sendToServer(SimpleNetworkWrapper.java:294) [SimpleNetworkWrapper.class:?]
    at treechopper.common.command.Commands.execute(Commands.java:157) [Commands.class:?]
    at net.minecraft.command.CommandHandler.tryExecute(CommandHandler.java:109) [CommandHandler.class:?]
    at net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:88) [CommandHandler.class:?]
    at net.minecraft.network.NetHandlerPlayServer.handleSlashCommand(NetHandlerPlayServer.java:955) [NetHandlerPlayServer.class:?]
    at net.minecraft.network.NetHandlerPlayServer.processChatMessage(NetHandlerPlayServer.java:931) [NetHandlerPlayServer.class:?]
    at net.minecraft.network.play.client.CPacketChatMessage.processPacket(CPacketChatMessage.java:47) [CPacketChatMessage.class:?]
    at net.minecraft.network.play.client.CPacketChatMessage.processPacket(CPacketChatMessage.java:8) [CPacketChatMessage.class:?]
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:15) [PacketThreadUtil$1.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_121]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_121]
    at net.minecraft.util.Util.runTask(Util.java:25) [Util.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:742) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:408) [DedicatedServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:687) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:536) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
[16:33:18] [Server thread/ERROR] [FML]: SimpleChannelHandlerWrapper exception
java.lang.RuntimeException: Missing
    at net.minecraftforge.fml.server.FMLServerHandler.getClientToServerNetworkManager(FMLServerHandler.java:288) ~[FMLServerHandler.class:?]
    at net.minecraftforge.fml.common.FMLCommonHandler.getClientToServerNetworkManager(FMLCommonHandler.java:545) ~[FMLCommonHandler.class:?]
    at net.minecraftforge.fml.common.network.FMLOutboundHandler$OutboundTarget$8.selectNetworks(FMLOutboundHandler.java:245) ~[FMLOutboundHandler$OutboundTarget$8.class:?]
    at net.minecraftforge.fml.common.network.FMLOutboundHandler.write(FMLOutboundHandler.java:293) ~[FMLOutboundHandler.class:?]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:658) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:716) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:651) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:112) ~[MessageToMessageEncoder.class:4.0.23.Final]
    at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116) ~[MessageToMessageCodec.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:658) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:716) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:706) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:741) ~[AbstractChannelHandlerContext.class:4.0.23.Final]
    at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:895) ~[DefaultChannelPipeline.class:4.0.23.Final]
    at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:240) ~[AbstractChannel.class:4.0.23.Final]
    at net.minecraftforge.fml.common.network.simpleimpl.SimpleNetworkWrapper.sendToServer(SimpleNetworkWrapper.java:294) [SimpleNetworkWrapper.class:?]
    at treechopper.common.command.Commands.execute(Commands.java:157) [Commands.class:?]
    at net.minecraft.command.CommandHandler.tryExecute(CommandHandler.java:109) [CommandHandler.class:?]
    at net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:88) [CommandHandler.class:?]
    at net.minecraft.network.NetHandlerPlayServer.handleSlashCommand(NetHandlerPlayServer.java:955) [NetHandlerPlayServer.class:?]
    at net.minecraft.network.NetHandlerPlayServer.processChatMessage(NetHandlerPlayServer.java:931) [NetHandlerPlayServer.class:?]
    at net.minecraft.network.play.client.CPacketChatMessage.processPacket(CPacketChatMessage.java:47) [CPacketChatMessage.class:?]
    at net.minecraft.network.play.client.CPacketChatMessage.processPacket(CPacketChatMessage.java:8) [CPacketChatMessage.class:?]
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:15) [PacketThreadUtil$1.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_121]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_121]
    at net.minecraft.util.Util.runTask(Util.java:25) [Util.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:742) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:408) [DedicatedServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:687) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:536) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]

[Choonster]

You're trying to send data to the server from the server, which makes no sense.

[Vizuall]

 that helps..

 

I have one more problem.

 

This is my message class:

public class ClientMessage implements IMessage {
    private boolean a;

    public ClientMessage() {
    }

    public ClientMessage(boolean a) {
        this.a = a;
    }

    @Override
    public void fromBytes(ByteBuf buf) {
        try {
            a = buf.readBoolean();
        } catch (IndexOutOfBoundsException e1) {
			..
        }
    }

    @Override
    public void toBytes(ByteBuf buf) {
        buf.writeBoolean(a);
    }

    public static class Handler implements IMessageHandler<ClientMessage, IMessage> {
        @Override
        public IMessage onMessage(ClientMessage message, MessageContext ctx) {

			THIS		
      
            return null;
        }
    }
}

 

with this in my core class

    public void init(FMLInitializationEvent event) {
        network.registerMessage(ClientMessage.Handler.class, ClientMessage.class, 0, Side.SERVER);
    }

 Now if I call it with this:

    @SubscribeEvent
    public void onClientConnect(FMLNetworkEvent.ClientConnectedToServerEvent event) {
        core.network.sendToServer(new ClientMessage(a));
    }

 

Command THIS in onMessage method, never executes.

Edited February 24, 2017 by Vizuall

[Choonster]

You shouldn't be catching IndexOutOfBoundsException, it should be allowed to propagate up to FML's exception handling and/or crash the game. It's only thrown when you've done something wrong that should be fixed.

 

Is the IMessageHandler scheduling a task on the main thread to perform its action? Is it being called at all?

[Vizuall]

Well, I just need to send some info on client connection to the server. Is there any preferable event?

[Draco18s]

EntityJoinedWorldEvent is probably the best

[Vizuall]

Just a single boolean, I need to work with that information.