I want to have a Gui with a purchasing function

 

I get the item but when i use it it delete itself

 

Code:

public class GuiTraitorMenu extends GuiScreen
{
private GuiButton teleporter = new GuiButton(0, 150 , 60, 100, 20, "Teleporter 2G");
private GuiButton fakemedipack = new GuiButton(1, 150 , 100, 100, 20, "explodierender Erste Hilfe Set 3G");

public GuiTraitorMenu ()
{ 
	super();
}

@Override
public void drawScreen(int x, int y, float f)
{
	drawDefaultBackground();

	GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
	this.mc.renderEngine.bindTexture(new ResourceLocation("minecrafttrouble:textures/gui/TraitorMenu.png"));

	drawTexturedModalRect((this.width - 256) / 2, (this.height - 256) *2, 0, 0, 256, 256);

	super.drawScreen(x, y, f);
}

@Override
public void initGui()
{
	this.buttonList.clear();
	this.buttonList.add(teleporter);
	this.buttonList.add(fakemedipack);
	GoldCheck();
}

public void actionPerformed(GuiButton button)
{	
	InventoryPlayer iv = this.mc.thePlayer.inventory;
	switch(button.id)
	{
		case 0:	iv.addItemStackToInventory(new ItemStack(main.Teleporter));
				iv.consumeInventoryItem(main.Gold);iv.consumeInventoryItem(main.Gold);
				GoldCheck();

		case 1:	iv.addItemStackToInventory(new ItemStack(main.FakeMediPack));
				iv.consumeInventoryItem(main.Gold);iv.consumeInventoryItem(main.Gold);iv.consumeInventoryItem(main.Gold);
				GoldCheck();
		break;
		default:
	}
}

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

private boolean hasItemInt(Item item, int min)
{
	InventoryPlayer iv = this.mc.thePlayer.inventory;
	int own = 0;
	for(int i = 0; i < iv.getSizeInventory(); i++)
	{
		if(iv.getStackInSlot(i) != null && iv.getStackInSlot(i).getItem() == item)
		{
			own = own + iv.getStackInSlot(i).stackSize;
		}
	}
	if(own >= min)
	{
		return true;
	}
	else
	{
		return false;
	}
}

private void GoldCheck()
{
	if(hasItemInt(main.Muenze, 2))
	{
		teleporter.enabled = true;
	}
	else
	{
		teleporter.enabled = false;
	}	
	if(hasItemInt(main.Muenze, 3))
	{
		fakemedipack.enabled = true;
	}
	else
	{
		fakemedipack.enabled = false;
	}
}
}

 

Second Problem:

if I max my Minecraft the Gui is normal

but if it not about the whole screen it buggs the buttons are at the wrong position and i not see the whole Gui

And how i do this?

The only one that i found was this:

 

http://www.minecraftforge.net/wiki/Packet_Handling

 

and this is a little bit old.

I registried the Netty Packet Handler now, but the example to Implementation not exist.

 

How i can use it now?

I try to handle it out by myself.

 

And for the tutorial:

That's the right link for the example:

https://github.com/SlimeKnights/TinkersConstruct/tree/master/src/main/java/tconstruct/util/network/packet