[1.14.4] NetWorking Client and Server side

[GnRSlashSP]

I am a little confused when I need to use the same message on both sides.

 

When I want to execute client side code like Minecraft.getInstance(), I can use this:

DistExecutor.runWhenOn(Dist.CLIENT, () -> () -> {
                    // this is client side
                    PlayerEntity playerEntity = Minecraft.getInstance().player;
                    Entity entity = playerEntity.world.getEntityByID(entityId);
  					....  // the rest of code here
});

 

but this is generating an error when I try to start the server.... the error occurs while registering network messages because there is Minecraft.getInstance in message body...

 

 

I don't know when to use this:

Dist.DEDICATED_SERVER

because I'm afraid of the code inside it only runs if the server is physical, I mean, the code inside this will not run when minecraft is running in single player mode.

 

Another approach that I used (but again I am not sure what I am doing), was this:

            if (ctx.get().getDirection().getReceptionSide().isServer()) {
                ent = ctx.get().getSender().world.getEntityByID(playerID);
                if (ent instanceof PlayerEntity) {
                  // server side code here....
                }
            } else if (ctx.get().getDirection().getReceptionSide().isClient()) {
                XPTransferScreen.open(playerID, playerName);
            }

 

Note that I am not using Client methods here directly, but I put the client part inside the XPTransferScreen.open method:

    public static void open(int playerIDToTransfer, String playerName) {
        Minecraft.getInstance().displayGuiScreen(new XPTransferScreen(playerIDToTransfer, playerName));
    }

 

This way the code runs without problems on single player and dedicated server.

 

 

So my question is:

Which method should i use?  (DistExecutor or getReceptionSide) ?

 

If your answer is DistExecutor, I have another question:  How can I run it server side and single player, Dist.DEDICATED_SERVER will run like server side if I run the single player game?

 

Thanks!

†GnR† Slash

 

Edited June 25, 2020 by GnRSlashSP

[GnRSlashSP]

Diesieben, thanks for the explanation. It's really complicated, but now I have a chance to write code the right way.

So I changed the code from:

PlayerEntity playerEntity = Minecraft.getInstance().player

to:

ClientPlayerEntity playerEntity = Minecraft.getInstance().player;

and it works!

 

But I still don't know why this do not work (even if I put all inside DistExecutor):

if (ctx.get().getDirection().getReceptionSide().isClient()) { 
    Minecraft.getInstance().displayGuiScreen(new XPTransferScreen(playerIDToTransfer, playerName));
}

 

and this works:

if (ctx.get().getDirection().getReceptionSide().isClient()) {
    XPTransferScreen.open(playerID, playerName);
}

 

this is inside XPTransfer class, that extends Screen:

public static void open(int playerIDToTransfer, String playerName) {
    Minecraft.getInstance().displayGuiScreen(new XPTransferScreen(playerIDToTransfer, playerName));
}

 

I just want to open a simple Screen, without container, just buttons, textfields