In my packet handler, I'm getting an exception every time I attempt to manipulate any item in a slot that isn't the hot-bar (0-8 is fine, 9-40 causes exception)

 

Example, this code (line 16):

 

 

 

public class SimplePacket implements IMessage {

public SimplePacket() {}

 

@Override

public void fromBytes(ByteBuf buf) {}

 

    @Override

    public void toBytes(ByteBuf buf) {}

 

    public static class Handler implements IMessageHandler<SimplePacket, IMessage> {

 

        @Override

        public IMessage onMessage(SimplePacket message, MessageContext ctx) {

        if (ctx.side.isServer()) {

EntityPlayerMP player = ctx.getServerHandler().playerEntity;

player.inventory.setInventorySlotContents(9, null);

        }

        return null;

        }

    }

}

 

 

 

produces this exception (yes there's an item in slot 9):

 

 

 

java.lang.IndexOutOfBoundsException: Index: 9, Size: 0

at java.util.ArrayList.rangeCheck(Unknown Source)

at java.util.ArrayList.get(Unknown Source)

at net.minecraft.inventory.Container.getSlot(Container.java:130)

at net.minecraft.inventory.Container.putStackInSlot(Container.java:547)

at net.minecraft.client.network.NetHandlerPlayClient.handleSetSlot(NetHandlerPlayClient.java:1154)

at net.minecraft.network.play.server.S2FPacketSetSlot.processPacket(S2FPacketSetSlot.java:33)

at net.minecraft.network.play.server.S2FPacketSetSlot.processPacket(S2FPacketSetSlot.java:79)

at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241)

at net.minecraft.client.multiplayer.PlayerControllerMP.updateController(PlayerControllerMP.java:317)

at net.minecraft.client.Minecraft.runTick(Minecraft.java:1682)

at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1028)

at net.minecraft.client.Minecraft.run(Minecraft.java:951)

at net.minecraft.client.main.Main.main(Main.java:164)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:78)

at GradleStart.main(GradleStart.java:45)

 

 

 

Any ideas? Need more information?

I don't know what is causing this, but you can try using player.inventory.mainInventory[number] = null;

Produces same exception. It's weird because it does actually set it to null.

It's being sent from a GUI extending GuiContainer

 

via:

 

 

private void dropItem()

{

ProjectCW.INSTANCE.sendToServer(new SimplePacket());

}

 

 

 

register code in main:

 

 

 

public static final SimpleNetworkWrapper INSTANCE = NetworkRegistry.INSTANCE.newSimpleChannel(modid);

 

@EventHandler

    public void init(FMLInitializationEvent event)

    {

            INSTANCE.registerMessage(SimplePacket.Handler.class, SimplePacket.class, 0, Side.SERVER);

 

 

GUI handler:

 

 

 

public class HandlerGUI implements IGuiHandler {

 

@Override

public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {

switch(ID) {

case ProjectCW.GUIIDPipboy:

return new ContainerPlayerInventory(player.inventory);

}

return null;

}

 

@Override

public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {

switch(ID) {

case ProjectCW.GUIIDPipboy:

return new GUIPipboy(player.inventory);

case ProjectCW.GUIIDGameMenu:

return new GUIGameMenu();

}

return null;

}

}

 

 

 

Opening GUI:

 

 

 

@SubscribeEvent

public void onKeyInput(InputEvent.KeyInputEvent event) {

if (keys[PIPBOY].isPressed()) {

if (!FMLClientHandler.instance().isGUIOpen(GuiChat.class)) {

if(!(Minecraft.getMinecraft().currentScreen instanceof GUIPipboy)) {

World world = Minecraft.getMinecraft().theWorld;

EntityPlayer player = Minecraft.getMinecraft().thePlayer;

player.openGui(ProjectCW.instance, ProjectCW.GUIIDPipboy, world, 0, 0, 0);

}

}

}

}

 

 

That must be it, thanks. Can you give an example on what would be in the packet handler to open the GUI?

I love you.