C01PacketChatMessage — Minecraft 1.8.9 Packet Reference

0x01 C01PacketChatMessage

Sends a chat message or command from the client to the server.

Serverbound (Client → Server) · PLAY · net/minecraft/network/play/client/C01PacketChatMessage.java

chatmessagecommand

Fields

Field	Type	Description
message	String	The chat message or command (commands start with /)

Wire Encoding

Field	Type	Notes
Message	String	Raw text, max 100 chars

MCP References

MCPNetHandlerPlayServer.processChatMessage()

Handler Interface

HNDINetHandlerPlayServer

implementation Implementation Cases

AutoGG (Astro 2.2.1, Flux B39.11, Sigma 3.9, Jigsaw 0.26, November 0.2, Nekoware v1, Memeware 7.3)

Send or intercept chat messages. AutoGG sends "gg" after death. Spammer sends repeating messages. ChatBypass modifies outgoing messages. Command system intercepts C01 for .prefix commands.

// Send
mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage("gg"));
// Intercept commands
if (event.getPacket() instanceof C01PacketChatMessage) {
  C01PacketChatMessage packet = (C01PacketChatMessage) event.getPacket();
  if (packet.getMessage().startsWith(".")) { event.setCancelled(true); processCommand(packet.getMessage()); }
}
// Bypass — cancel + re-send with modification
if (event.getPacket() instanceof C01PacketChatMessage) {
  event.setCancelled(true);
  String modified = ((C01PacketChatMessage)event.getPacket()).getMessage().replace("%","");
  mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage(modified));
}

Vanilla hook: EventSendPacket / sendChatMessage override

Spammer (Astro 2.2.1, Flux B39.11, Sigma 3.9, Jigsaw 0.26, November 0.2, Nekoware v1, Memeware 7.3)

Send or intercept chat messages. AutoGG sends "gg" after death. Spammer sends repeating messages. ChatBypass modifies outgoing messages. Command system intercepts C01 for .prefix commands.

// Send
mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage("gg"));
// Intercept commands
if (event.getPacket() instanceof C01PacketChatMessage) {
  C01PacketChatMessage packet = (C01PacketChatMessage) event.getPacket();
  if (packet.getMessage().startsWith(".")) { event.setCancelled(true); processCommand(packet.getMessage()); }
}
// Bypass — cancel + re-send with modification
if (event.getPacket() instanceof C01PacketChatMessage) {
  event.setCancelled(true);
  String modified = ((C01PacketChatMessage)event.getPacket()).getMessage().replace("%","");
  mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage(modified));
}

Vanilla hook: EventSendPacket / sendChatMessage override

ChatBypass (Astro 2.2.1, Flux B39.11, Sigma 3.9, Jigsaw 0.26, November 0.2, Nekoware v1, Memeware 7.3)

Send or intercept chat messages. AutoGG sends "gg" after death. Spammer sends repeating messages. ChatBypass modifies outgoing messages. Command system intercepts C01 for .prefix commands.

// Send
mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage("gg"));
// Intercept commands
if (event.getPacket() instanceof C01PacketChatMessage) {
  C01PacketChatMessage packet = (C01PacketChatMessage) event.getPacket();
  if (packet.getMessage().startsWith(".")) { event.setCancelled(true); processCommand(packet.getMessage()); }
}
// Bypass — cancel + re-send with modification
if (event.getPacket() instanceof C01PacketChatMessage) {
  event.setCancelled(true);
  String modified = ((C01PacketChatMessage)event.getPacket()).getMessage().replace("%","");
  mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage(modified));
}

Vanilla hook: EventSendPacket / sendChatMessage override

Commands (Astro 2.2.1, Flux B39.11, Sigma 3.9, Jigsaw 0.26, November 0.2, Nekoware v1, Memeware 7.3)

Send or intercept chat messages. AutoGG sends "gg" after death. Spammer sends repeating messages. ChatBypass modifies outgoing messages. Command system intercepts C01 for .prefix commands.

// Send
mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage("gg"));
// Intercept commands
if (event.getPacket() instanceof C01PacketChatMessage) {
  C01PacketChatMessage packet = (C01PacketChatMessage) event.getPacket();
  if (packet.getMessage().startsWith(".")) { event.setCancelled(true); processCommand(packet.getMessage()); }
}
// Bypass — cancel + re-send with modification
if (event.getPacket() instanceof C01PacketChatMessage) {
  event.setCancelled(true);
  String modified = ((C01PacketChatMessage)event.getPacket()).getMessage().replace("%","");
  mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage(modified));
}

Vanilla hook: EventSendPacket / sendChatMessage override

AutoRegister (Astro 2.2.1, Flux B39.11, Sigma 3.9, Jigsaw 0.26, November 0.2, Nekoware v1, Memeware 7.3)

Send or intercept chat messages. AutoGG sends "gg" after death. Spammer sends repeating messages. ChatBypass modifies outgoing messages. Command system intercepts C01 for .prefix commands.

// Send
mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage("gg"));
// Intercept commands
if (event.getPacket() instanceof C01PacketChatMessage) {
  C01PacketChatMessage packet = (C01PacketChatMessage) event.getPacket();
  if (packet.getMessage().startsWith(".")) { event.setCancelled(true); processCommand(packet.getMessage()); }
}
// Bypass — cancel + re-send with modification
if (event.getPacket() instanceof C01PacketChatMessage) {
  event.setCancelled(true);
  String modified = ((C01PacketChatMessage)event.getPacket()).getMessage().replace("%","");
  mc.thePlayer.sendQueue.addToSendQueue(new C01PacketChatMessage(modified));
}

Vanilla hook: EventSendPacket / sendChatMessage override

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