Recently I've found a need to extend the chat limit in 1.8.9, it is really useful being twice its normal size in 1.10 and above and I want it in 1.8.9. The server I want to use this mod on allows the increased chat limit across all versions and so it needs to actually be sent as a message.

 

I've accomplished this with MCP (you literally just need to change one variable pretty much) but I would like to know how to do it in forge.

 

I've done some research and most people seem to suggest class transformers, however these seem extremely complex and apparently need to be coded myself if they are to work - I have no clue where to start with this.

 

If anybody knew of any alternatives to class transformers, or could give me any pointers I would greatly appreciate it!

Is it a variable?

Access it with reflection.

Is it a hard coded value? Tough luck, can't do it.

Is it a variable?

Access it with reflection.

Is it a hard coded value? Tough luck, can't do it.

 

I've done this:

 

public class ExtendedChatGui {
    private String defaultTextField = "";
    public static GuiChat gc = new GuiChat();

    public void printField() throws Exception {
        Class<?> objClass = gc.getClass();
        Field[] fields = objClass.getDeclaredFields();

        System.out.println("Printing fields: ");
        for (Field field : fields) {
            field.setAccessible(true);
            String name = field.getName();
            System.out.println(name);
        }
    }
}

 

This prints all the fields, including inputField, which is the variable I need.

 

This is the variable:

 

protected GuiTextField inputField;

 

The issue is, to set the max string length a method is called like so:

 

this.inputField.setMaxStringLength(255);

 

How would I go about calling this method from the array of fields I have?

 

 

 

 

 

 

 

More reflection. Specifically

getValue

.

And if the method you need to invoke is also private, you'll have to use

invoke

More reflection. Specifically

getValue

.

And if the method you need to invoke is also private, you'll have to use

invoke

 

How though? fields[8] has no method .getValue...

 

I also tried this method I found online:

 

Object c = f.get(gc);

 

Printing c.toString() returns a null pointer exception.

Sorry, it's called "get"

Alternatively you can use the ReflectionHelper class.  Although I do advise referencing things by name (which means you'll have to use MCPBot to get the SRG name as well) rather than by index.  The index might change unexpectedly.

 

For example:

DamageSource damage = ReflectionHelper.getPrivateValue(LootContext.class, context, "damageSource","field_186503_f");

Sorry, it's called "get"

Alternatively you can use the ReflectionHelper class.  Although I do advise referencing things by name (which means you'll have to use MCPBot to get the SRG name as well) rather than by index.  The index might change unexpectedly.

 

For example:

DamageSource damage = ReflectionHelper.getPrivateValue(LootContext.class, context, "damageSource","field_186503_f");

 

I'm still a little confused.

 

How does one invoke a method from a field?

 

 

Edit: I think I may have it:

 

My new code:

 

    Field f = fields[8];
        f.setAccessible(true);

        Object fieldValue = f.get(gc);
        Method method = fieldValue.getClass().getDeclaredMethod("setMaxStringLength");
        method.invoke(fieldValue, 256);

 

 

Edit:

 

Nope, got this error:

 

java.lang.NoSuchMethodException: java.lang.String.setMaxStringLength()

 

It's referencing java.lang.String, it's supposed to be GuiTextField...

Oh jesus fucking christ.  I even GAVE you an example of how to use it.  It gives you back a typed object that has all the publicly accessible objects you'd want for an object of that type.  Stop casting it to Object.

Oh jesus fucking christ.  I even GAVE you an example of how to use it.  It gives you back a typed object that has all the publicly accessible objects you'd want for an object of that type.  Stop casting it to Object.

 

Getting a null pointer:

 

 GuiTextField gui = ReflectionHelper.getPrivateValue(GuiChat.class, gc, "inputField");

        gui.setMaxStringLength(256);

 

It's on the gui.setMaxStringLength

 

 

 

Please be patient, I know it's frustrating but I'm learning and I've never had to use reflection before...

You are running this code client side only yes?

You are running this code client side only yes?

Yes.

 

When I print gui it returns null.

 

This is being executed in the pre-init by the way. I'm not sure if that means the variable hasn't been initialised yet or something.

Well yes. Because that value is not static and a new GuiChat screen is created every time the chat is opened.

So you will have to wait for it to be open, then change it. You can't do it in the mod initialization phases.

Well yes. Because that value is not static and a new GuiChat screen is created every time the chat is opened.

So you will have to wait for it to be open, then change it. You can't do it in the mod initialization phases.

 

I don't suppose there is an event for Chat Opened in Forge?

Well yes. Because that value is not static and a new GuiChat screen is created every time the chat is opened.

So you will have to wait for it to be open, then change it. You can't do it in the mod initialization phases.

 

I don't suppose there is an event for Chat Opened in Forge?

There is an OpenGui event look under the net.minecraftforge.events package

This will not work, this is not the only place that forces the string length. This is a network packet thing.

The server would receive a string that is to ling and kick you.

There is no way to do this with reflection or anything, and your 'mcp' fix doesn't actually work.

This will not work, this is not the only place that forces the string length. This is a network packet thing.

The server would receive a string that is to ling and kick you.

There is no way to do this with reflection or anything, and your 'mcp' fix doesn't actually work.

 

My MCP fix does work as I have tested it thoroughly.

 

As I said in my main post the server has a plugin which SUPPORTS double the chat limit.

 

Well yes. Because that value is not static and a new GuiChat screen is created every time the chat is opened.

So you will have to wait for it to be open, then change it. You can't do it in the mod initialization phases.

 

I don't suppose there is an event for Chat Opened in Forge?

There is an OpenGui event look under the net.minecraftforge.events package

 

I'm still getting a Null Pointer. The code is fired when I open the chat (managed to do that), but it's still null...

I'm still getting a Null Pointer. The code is fired when I open the chat (managed to do that), but it's still null...

 

I don't know, then.