Hello,

I want to give item to player. Here's My Code:

public void giveItem(ItemStack stack, EntityPlayer player)
{
      player.inventory.addItemStackToInventory(stack);
}

When I use this method it gives item to player but if player is in survival gamemode and when player clicks that item it disappears. how to fix this?

Then how to do this? How to give Item to player?

I have GuiScreen class and when player clicks button that method is called

how to do that?

I wish there where tutorials for that..

 

Also, you could learn a bit about client/server sync and GUIs from vswe's courses about gui's

aww no one mention my tutorial about packet

I read Packet Handling. this is what I found about sending packets:

PacketDispatcher.sendPacketToPlayer(packet, (Player)player);

and:

package tutorial.generic;

import net.minecraft.network.INetworkManager;
import net.minecraft.network.packet.Packet250CustomPayload;
import cpw.mods.fml.common.network.IPacketHandler;
import cpw.mods.fml.common.network.Player;

public class PacketHandler implements IPacketHandler {

        @Override
        public void onPacketData(INetworkManager manager,
                        Packet250CustomPayload packet, Player playerEntity) {
                // TODO Auto-generated method stub
        }

}

But what I have to write to send ItemStack to player?

I made Test packet from tutorial to send message but it don't works. here's my code:

import com.google.common.io.ByteArrayDataInput;
import com.google.common.io.ByteArrayDataOutput;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.network.INetworkManager;
import net.minecraft.network.packet.Packet250CustomPayload;
import cpw.mods.fml.common.network.IPacketHandler;
import cpw.mods.fml.common.network.Player;
import cpw.mods.fml.relauncher.Side;

public class PacketHandler extends Packet 
{
    private String text;
    
    public PacketHandler(String text) {
            this.text = text;
    }

    public PacketHandler() { } 
@Override
public void write(ByteArrayDataOutput out) {
	// TODO Auto-generated method stub

}

@Override
public void read(ByteArrayDataInput in) throws ProtocolException {
	// TODO Auto-generated method stub

}

@Override
public void execute(EntityPlayer player, Side side) throws ProtocolException 
{
	if (side.isClient()) 
	{
            player.addChatMessage(text);
        }
	else 
	{
		throw new ProtocolException("Cannot send this packet to the server!");
        }
}

}

mport net.minecraft.entity.player.EntityPlayer;
import net.minecraft.network.packet.Packet250CustomPayload;

import com.google.common.collect.BiMap;
import com.google.common.collect.ImmutableBiMap;

import com.google.common.io.ByteArrayDataInput;
import com.google.common.io.ByteArrayDataOutput;
import com.google.common.io.ByteStreams;

import cpw.mods.fml.common.network.PacketDispatcher;
import cpw.mods.fml.common.network.Player;
import cpw.mods.fml.relauncher.Side;

public abstract class Packet {

        public static final String CHANNEL = "demomod";
        private static final BiMap<Integer, Class<? extends Packet>> idMap;
                
        static {
                ImmutableBiMap.Builder<Integer, Class<? extends Packet>> builder = ImmutableBiMap.builder();
                
                builder.put(Integer.valueOf(0), PacketHandler.class);
                // more packets like this:
                // builder.put(Integer.valueOf(1), AnotherPacket.class);
                // builder.put(Integer.valueOf(2), YetAnotherPacket.class);
                
                idMap = builder.build();
        }

        public static Packet constructPacket(int packetId) throws ProtocolException, ReflectiveOperationException {
                Class<? extends Packet> clazz = idMap.get(Integer.valueOf(packetId));
                if (clazz == null) {
                        throw new ProtocolException("Unknown Packet Id!");
                } else {
                        return clazz.newInstance();
                }
        }

        public static class ProtocolException extends Exception {

                public ProtocolException() {
                }

                public ProtocolException(String message, Throwable cause) {
                        super(message, cause);
                }

                public ProtocolException(String message) {
                        super(message);
                }

                public ProtocolException(Throwable cause) {
                        super(cause);
                }
        }

        public final int getPacketId() {
                if (idMap.inverse().containsKey(getClass())) {
                        return idMap.inverse().get(getClass()).intValue();
                } else {
                        throw new RuntimeException("Packet " + getClass().getSimpleName() + " is missing a mapping!");
                }
        }
        
        public final Packet250CustomPayload makePacket() 
        {
                ByteArrayDataOutput out = ByteStreams.newDataOutput();
                out.writeByte(getPacketId());
                write(out);
                return PacketDispatcher.getPacket(CHANNEL, out.toByteArray());
        }

        public abstract void write(ByteArrayDataOutput out);
        
        public abstract void read(ByteArrayDataInput in) throws ProtocolException;
        
        public abstract void execute(EntityPlayer player, Side side) throws ProtocolException;
}

and on Gui Button Action I added this:

PacketDispatcher.sendPacketToServer(new PacketHandler("Hello World!").makePacket());

But it don't sends message to player. why? Am I doing something wrong?

(On Main Mod Class I'm using this:

@NetworkMod(clientSideRequired = true, serverSideRequired = false)