Hello,

 

I would like to open a GuiScreen when the player login but currently  the Gui doesn't open when the player connects

 

EventHandler : (register with FMLCommonHandler.instance().bus().register(eventHandler);)

Spoiler

@SubscribeEvent
	public void JoinWorld(EntityJoinWorldEvent event) {
		if (event.getEntity() instanceof EntityPlayer) {

			EntityPlayer player = (EntityPlayer) event.getEntity();
			if (player.world.isRemote) {

				player.openGui(IdPlayer.instance, ModGuiHandler.LANGUAGE, player.world, (int) player.posX,
						(int) player.posY, (int) player.posZ);
			}
		}
	}

 

 

GuiHandler :

Spoiler

public class ModGuiHandler implements IGuiHandler {
	public static final int LANGUAGE = 0;

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

		return null;

	}

	@Override
	public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
		switch (ID) {
		case LANGUAGE:
			return new GuiLanguage();
		default:
			return null;
		}
	}

}

 

 

Gui :

Spoiler

public class GuiLanguage extends GuiScreen {
	private static final ResourceLocation BG_TEXTURE = new ResourceLocation(Reference.MODID,
			"textures/gui/idbackgroundlanguage.png");

	protected final int xSize = 256;
	protected final int ySize = 256;
	
	private int guiLeft;
	private int guiTop;

	// button
	private final int fr = 0;
	private final int en = 1;
	private final int valid = 2;

	// variable
	private String validString;

	
	@Override
	public void drawScreen(int mouseX, int mouseY, float partialTicks) {
		GlStateManager.color(1, 1, 1, 1);
		mc.getTextureManager().bindTexture(BG_TEXTURE);
		int x = (width - this.xSize) / 2;
		int y = (height - this.ySize) / 2;
		drawTexturedModalRect(x, y, 0, 0, this.xSize, this.ySize);
		super.drawScreen(mouseX, mouseY, partialTicks);
	}

	@Override
	public boolean doesGuiPauseGame() {
		return false;
	}

	@Override
	public void initGui() {
		
		this.guiLeft = (this.width - this.xSize) / 2;
		this.guiTop = (this.height - this.ySize) / 2;

		this.buttonList.clear();
		this.buttonList.add(new GuiButton(this.fr, this.guiLeft + 74, this.guiTop + 118, 50, 15, "Francais"));
		this.buttonList.add(new GuiButton(this.en, this.guiLeft + 131, this.guiTop + 118, 50, 15, "English"));
	
		super.initGui();
	}
	
	

	@Override
	protected void actionPerformed(GuiButton button) throws IOException {
		switch (button.id) {
		case fr:
			validString = "valider";
			break;
		case en:
			validString = "valid";
			break;
		default:
			break;

		}
		
		this.buttonList.clear();
		this.buttonList.add(new GuiButton(this.fr, this.guiLeft + 74, this.guiTop + 118, 50, 15, "Francais"));
		this.buttonList.add(new GuiButton(this.en, this.guiLeft + 131, this.guiTop + 118, 50, 15, "English"));
		this.buttonList.add(new GuiButton(this.valid, this.guiLeft + 103, this.guiTop + 148, 50, 15, validString));
	}
}

 

 

• I used IGuiHandler because I read EntityJoinWorldEvent it's a server event and GuiScreen it's only client (so it's for this reason I used player.openGui)
• This Gui show a menu for choose language. I would like to open this GUI when player join the server for the first time

Ty for information, but do you have an exemple to use packet (I never used this before)