This is a pretty silly request, but some of the big forge mods like EE2 use the players username for saving stuff, and if your offline it uses a random username, and I have already fixed this, but I am asking if Forge can detect if the game is playing in offline, and if so, set net.minecraft.client.Minecraft.session.username to the first UTF in the .minecraft/lastlogin file, so when your playing offline, you would stille have your username. Its pretty easy to implement, but im not posting code because the lastlogin file uses a Cipher (assuming a cipher is a encrytion.. lol)

 

Edit:

 

code with cipher removed

 

@Override
public void load()
{
	File file = new File(Minecraft.getAppDir("minecraft"), "lastlogin");
	if(file.exists() && isOffline())
	{
		try
		{
			CipherInputStream cipherStream = new CipherInputStream(new FileInputStream(file), getCipher(2, "passwordfile"));
			DataInputStream stream = new DataInputStream(cipherStream);
			String username = stream.readUTF();
			System.out.println("Setting offline username as " + username + ".");
			ModLoader.getMinecraftInstance().session.username = username;
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
}

/**
 * Copied directly from Minecraft.exe to get access to the lastligin files because it uses a cipher.
 * 
 * @param mode
 * @param password
 * @return
 * @throws Exception
 */
private Cipher getCipher(int mode, String password)
{
	//removed for various reasons
                return null;
}

public static boolean isOffline()
{
	try
	{
		URL var1 = new URL("http://s3.amazonaws.com/MinecraftResources/");
            DocumentBuilderFactory var2 = DocumentBuilderFactory.newInstance();
            DocumentBuilder var3 = var2.newDocumentBuilder();
            Document var4 = var3.parse(var1.openStream());
            return false;
	}
	catch(Exception e)
	{
		return true;
	}
}

 

It is possibly to do in a simple mod_ file, but it would be more effective if it is ran before mods are initialized.

You could just run the game in offline mode with a unsername, its just a parameter when you run it.

this should actually be deemed a bug in the mod, no client-side mod has need for the username to store data properly, doing so is therefore useless

 

storing info on a SMP server by username i can get, not on a client where a mod SHOULD assume a single user per world anyhow

... thats the same thing as using cracked -.-

but no I don't have cracked

How is this just like cracked? you still need a username and password to login to minecraft, this is just when you try to play minecraft without a internet connection

... play minecraft, go offline, play "cracked" (its not exactly cracked, but you'll be playing as YourPlayerName instead of Player, and thats like playing cracked, and you can easily modify the code to change the YourPlayerName)

Again, this is nothing like cracked, you still need a minecraft username and password to login to minecraft to get a lastlogin file, which this would only set the username to your lastlogin IF your playing without a internet connection, not in offline mode. locking this thread so it doesnt turn into flame.