Hello,

I want to make a simple GUI and I want to open this GUI with a command. The GUI should only display a "Help" with icons (Blocks and Items) and text (Description) but that's not my problem. I cant open the GUI. Whenever I run the command I get an error.

 

[server thread/ERROR]: Couldn't process command: 'mycommand'

java.lang.ClassCastException: tk.MyName.MyMod.gui.GuiHelp cannot be cast to net.minecraft.inventory.Container

 

 

Command Class:

public class CommandMain extends CommandBase
{
protected Minecraft mc;

    public String getCommandName(){
        return "mycommand";
    }

    /**
     * Return the required permission level for this command.
     */
    public int getRequiredPermissionLevel(){
        return 0;
    }
    
    /**
     * Return the required permission level for this command.
     */
    public String getCommandUsage(ICommandSender commandSender){
        return "Usage";
    }

    public void processCommand(ICommandSender commandSender, String[] strArray){
        
    	int i;
        WorldServer worldserver = MinecraftServer.getServer().worldServers[1];
        
        commandSender.addChatMessage(new ChatComponentTranslation("commands.main.heading",  new Object[0]));
        EntityPlayer     p = (EntityPlayer)commandSender;
        World            w = p.getEntityWorld();
        ChunkCoordinates c = commandSender.getPlayerCoordinates();
        int x = c.posX;
        int y = c.posY;
        int z = c.posZ;

        System.out.println("CommandMain.java: call GUI");
        p.openGui(Main.instance, 100, w, x, y, z);
        System.out.println("CommandMain.java: done");   
    }

   
    
}

 

GuiHandler Class:

public class GuiHandler implements IGuiHandler{

public GuiHandler (){

}

@Override
public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
	if(ID == 0){
		---
	}else if(ID == 1){
		---
	}else if(ID == 100){
		System.out.println("GuiHandler: getClientGuiElement ID == 100 called");
		return new GuiHelp(player);
	}
	return null;
    }

@Override
public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
	if(ID == 0){
		---
	}else if(ID == 1){
		---
	}else if(ID == 100){
		System.out.println("GuiHandler: getServerGuiElement ID == 100 called");

		return new GuiHelp(player);
	}
	return null; 
}
}

 

Gui Class: (its a modified copy of the DemoGui)

@SideOnly(Side.CLIENT)
public class GuiHelp extends GuiScreen{

private static final Logger logger = LogManager.getLogger();
    private static final ResourceLocation field_146348_f = new ResourceLocation("textures/gui/demo_background.png");

    
    public GuiHelp(EntityPlayer player){
    	
    }
    
    @Override
    public boolean doesGuiPauseGame()
    {
        return false;
    }
    
    /**
     * Adds the buttons (and other controls) to the screen in question.
     */
    public void initGui()
    {
        this.buttonList.clear();
        byte b0 = -16;
        this.buttonList.add(new GuiButton(1, this.width / 2 - 116, this.height / 2 + 62 + b0, 114, 20, I18n.format("gui.help.ok", new Object[0])));
    }

    protected void actionPerformed(GuiButton button)
    {
        switch (button.id)
        {
            case 1:
                button.enabled = false;
                this.mc.displayGuiScreen((GuiScreen)null);
                this.mc.setIngameFocus();
        }
    }

    /**
     * Called from the main game loop to update the screen.
     */
    public void updateScreen()
    {
        super.updateScreen();
    }

    /**
     * Draws either a gradient over the background screen (when it exists) or a flat gradient over background.png
     */
    public void drawDefaultBackground()
    {
        super.drawDefaultBackground();
        GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
        this.mc.getTextureManager().bindTexture(field_146348_f);
        int i = (this.width - 248) / 2;
        int j = (this.height - 166) / 2;
        this.drawTexturedModalRect(i, j, 0, 0, 248, 166);
    }

    /**
     * Draws the screen and all the components in it.
     */
    public void drawScreen(int p_73863_1_, int p_73863_2_, float p_73863_3_)
    {
        this.drawDefaultBackground();
        int k = (this.width - 248) / 2 + 10;
        int l = (this.height - 166) / 2 + 8;
        this.fontRendererObj.drawString(I18n.format("demo.help.title", new Object[0]), k, l, 2039583);
        l += 12;
        GameSettings gamesettings = this.mc.gameSettings;
        this.fontRendererObj.drawString(I18n.format("demo.help.movementShort", new Object[] {GameSettings.getKeyDisplayString(gamesettings.keyBindForward.getKeyCode()), GameSettings.getKeyDisplayString(gamesettings.keyBindLeft.getKeyCode()), GameSettings.getKeyDisplayString(gamesettings.keyBindBack.getKeyCode()), GameSettings.getKeyDisplayString(gamesettings.keyBindRight.getKeyCode())}), k, l, 5197647);
        this.fontRendererObj.drawString(I18n.format("demo.help.movementMouse", new Object[0]), k, l + 12, 5197647);
        this.fontRendererObj.drawString(I18n.format("demo.help.jump", new Object[] {GameSettings.getKeyDisplayString(gamesettings.keyBindJump.getKeyCode())}), k, l + 24, 5197647);
        this.fontRendererObj.drawString(I18n.format("demo.help.inventory", new Object[] {GameSettings.getKeyDisplayString(gamesettings.keyBindInventory.getKeyCode())}), k, l + 36, 5197647);
        this.fontRendererObj.drawSplitString(I18n.format("demo.help.fullWrapped", new Object[0]), k, l + 68, 218, 2039583);
        super.drawScreen(p_73863_1_, p_73863_2_, p_73863_3_);
    }

}

 

 

What am I doing wrong?

I think my GuiHandler is not right.

You're right, your GuiHandler is not right. In the

getServerGuiElement(params)

method you return a Gui instead of a Container. If you don't want a container, you need to call the

EntityPlayer#openGui(params)

method client side (

world.isRemote

is true for client, false for server) and return null for

getServerGuiElement(params)

.

Changes:

 

GuiHandler

}else if(ID == 100){
System.out.println("GuiHandler: getServerGuiElement ID == 100 called");
return null;
}

 

Command

@SideOnly(Side.CLIENT)
    public void processCommand(ICommandSender commandSender, String[] strArray){
        
    	int i;
        WorldServer worldserver = MinecraftServer.getServer().worldServers[1];
        
        commandSender.addChatMessage(new ChatComponentTranslation("commands.main.heading",  new Object[0]));
        EntityPlayer     p = (EntityPlayer)commandSender;
        World            w = p.getEntityWorld();
        ChunkCoordinates c = commandSender.getPlayerCoordinates();
        int x = c.posX;
        int y = c.posY;
        int z = c.posZ;

        System.out.println("CommandMain.java: call GUI");
        if(w.isRemote){
        	System.out.println("CommandMain.java:CLIENT - World is remote");
        	p.openGui(Main.instance, 100, w, x, y, z);
        }else{
        	System.out.println("CommandMain.java:SERVER - World is not remote");
        }
       
        System.out.println("CommandMain.java: done");   
    }

 

But it doesnt work.

 

Console output:

 

CommandMain.java: call GUI

CommandMain.java:SERVER - World is not remote

CommandMain.java: done

Commands are processed on the server side. You need to send a packet to the client that notifys the client to open the GUI. There's a nice tutorial on the SimpleNetworkWrapper in the tutorials section.

Thank you, but that's too deep for me :'(. I found another solution. I created a Dummy Container which displays the GUI. Now I cant use GuiScreen but it works.