So ive been searching everywhere looking for how to let the server know when you update your inventory such as

 ModLoader.getMinecraftInstance().thePlayer.inventory.setInventorySlotContents(var2, new ItemStack(ITEM.shiftedIndex,1,0));   
                      		

but i havent found out how. i know it requires packets though which ive never had to use in minecraft mod before so im sorta confused ive followed a packet tutorial but i still didnt get it so would someone tell me/create a guide on letting the server know if you inventory is changed? thanks in advanced.

 

 

-Jango

Could you tell us where you call this kind of code? In a GUI, in an entity (interact(...) method), whatever... Maybe it's not even necessary to send packets.

Also don't use ModLoader stuff anymore. In your example, you can get theMinecraft instance with Minecraft.getMinecraft() instead of ModLoader.getMinecraftInstance() (warning: don't use these in classes which are supposed to be in the server, too!)

Its in a keybind a ModLoader one i find that Forge keybinds are verry over complicated so this is what im using

   public void keyboardEvent(KeyBinding var1)
    {
            if (var1.isPressed() && var1.keyCode == 19)
            {
                    int var2 = ModLoader.getMinecraftInstance().thePlayer.inventory.currentItem;
                    ItemStack var3 = ModLoader.getMinecraftInstance().thePlayer.inventory.getStackInSlot(var2);
                    
                    
                    if (var3 == null)
                    {
                     return;
                    }
                    
                    if (var3.itemID == mod_jangostarwars.LightSaberOFF.shiftedIndex)
                     {
                    
                     sabersound.sndManager.playSoundFX("LightSaberSound.LightSaberOnSound", 1.0F, 1.0F);
                     
                     		if(var3.itemID == mod_jangostarwars.LightSaberOFF.shiftedIndex && var3.getItemDamage() == 0)  
                      		{
                     			Minecraft.getMinecraft().thePlayer.inventory.setInventorySlotContents(var2, new ItemStack(mod_jangostarwars.LightSaber,1,0));   
                      		}
}
}

Its in a keybind a ModLoader one i find that Forge keybinds are verry over complicated so this is what im using

   public void keyboardEvent(KeyBinding var1)
    {
            if (var1.isPressed() && var1.keyCode == 19)
            {
                    int var2 = ModLoader.getMinecraftInstance().thePlayer.inventory.currentItem;
                    ItemStack var3 = ModLoader.getMinecraftInstance().thePlayer.inventory.getStackInSlot(var2);
                    
                    
                    if (var3 == null)
                    {
                     return;
                    }
                    
                    if (var3.itemID == mod_jangostarwars.LightSaberOFF.shiftedIndex)
                     {
                    
                     sabersound.sndManager.playSoundFX("LightSaberSound.LightSaberOnSound", 1.0F, 1.0F);
                     
                     		if(var3.itemID == mod_jangostarwars.LightSaberOFF.shiftedIndex && var3.getItemDamage() == 0)  
                      		{
                     			Minecraft.getMinecraft().thePlayer.inventory.setInventorySlotContents(var2, new ItemStack(mod_jangostarwars.LightSaber,1,0));   
                      		}
}
}

 

I have no idea what to do to make it better, but you are giving the player the same item again when the metadata of the item they're holding is 0 (and you are also checking the item ID twice. Once, and then again inside the check. You can just remove the second one).

i have it like that because i have multiple if statements like that on the inside of it for a bunch of meta data and that is required. also that is not the problem its the server replacing it when i use the replaceItemStack or whatever method it dosent work anymore due to the server and client merge so you need to send packets to the server letting it know the inventory has changed but i dont know how to do this that is the problem.

if i remember correctly you can use FMLCommonHandler.getMinecraftInstance() to get it working, i haven't coded for a couple of weeks and have not used the latest version of forge, if it does not work then disregard this post

there is no such method as getMinecraftInstance in that class

FMLClientHandler.getMinecraftInstance(). Not FMLCommonHandler

And again there is no such method and getClient() i have static-nonstatic errors.