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Brues
1340cc75c7
Shows a local CHAT_MSG_SYSTEM line through the engine's chat line function, called as the game-message display calls it for a chat-kind message: chat type 10 and ten zero arguments.
69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
// This file is part of ClassicAPI.
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//
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// ClassicAPI is free software: you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software Foundation, either
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// version 3 of the License, or (at your option) any later version.
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//
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// ClassicAPI is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along with
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// ClassicAPI. If not, see <https://www.gnu.org/licenses/>.
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// `SendSystemMessage(msg)` — a local CHAT_MSG_SYSTEM line.
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//
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// 4.3.4 calls CGChat::AddChatMessage(msg, CHAT_MSG_SYSTEM, NULL). 1.12's
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// equivalent is the chat line function FUN_CHAT_DISPATCH, called exactly as the
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// game-message display FUN_00496720 calls it for a chat-kind message (0x00496822):
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// chat type 10 in EDX and ten zero stack args. The engine copies the text into
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// its own 0x800 buffer with a bounded SStrCopy (0x0049A9F1), so any length is
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// safe. The call goes through Chat::Dispatch's hook like every engine system
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// line does.
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#include "Game.h"
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#include "Offsets.h"
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#include <cstdint>
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namespace Chat::SystemMessage {
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namespace {
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constexpr int CHAT_MSG_SYSTEM = 0x0A;
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using ChatDispatch_t = void(__fastcall *)(
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const char *message, int chatType,
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const char *senderName, int languageID, const char *channel, const char *targetName,
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const char *flags, int speakerGuidLo, int speakerGuidHi, int rank,
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int guidLo, int guidHi);
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int __fastcall Script_SendSystemMessage(void *L) {
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if (!Game::Lua::IsString(L, 1))
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Game::Lua::Error(L, "Usage: SendSystemMessage(\"message\")");
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auto dispatch = reinterpret_cast<ChatDispatch_t>(
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static_cast<uintptr_t>(Offsets::FUN_CHAT_DISPATCH));
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dispatch(Game::Lua::ToString(L, 1), CHAT_MSG_SYSTEM, nullptr, 0, nullptr, nullptr,
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nullptr, 0, 0, 0, 0, 0);
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return 0;
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}
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const Game::Doc::Field kArgs[] = {
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Game::Doc::Req("message", "string", "The text of the line."),
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};
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const Game::Doc::Function kSendSystemMessage{
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"Shows a line in chat as a system message, only on your own client. It fires "
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"CHAT_MSG_SYSTEM with the text as arg1.",
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kArgs, {}, "ChatGlobals"};
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} // namespace
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static void RegisterLuaFunctions() {
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Game::Lua::RegisterGlobalFunction("SendSystemMessage", &Script_SendSystemMessage,
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&kSendSystemMessage);
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}
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static const Game::ModuleAutoRegister _autoreg{&RegisterLuaFunctions};
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} // namespace Chat::SystemMessage
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