VLC 之 lua 程式除錯追蹤

vlc.msg.dbg("debug message")
vlc.msg.err("error message")

modules/lua/intf.c
static int Start_LuaIntf( vlc_object_t *p_this, const char *name )
-> luaopen_msg( L );

modules/lua/libs/messages.c
static const luaL_Reg vlclua_msg_reg[] = {
    { "dbg", vlclua_msg_dbg },
    { "warn", vlclua_msg_warn },
    { "err", vlclua_msg_err },
    { "info", vlclua_msg_info },
    { NULL, NULL }
};
void luaopen_msg( lua_State *L )

{

    lua_newtable( L );

    luaL_register( L, NULL, vlclua_msg_reg );

    lua_setfield( L, -2, "msg" );

}

static int vlclua_msg_err( lua_State *L )

{

    int i_top = lua_gettop( L );

    vlc_object_t *p_this = vlclua_get_this( L );

    int i;

    for( i = 1; i <= i_top; i++ )

        msg_Err( p_this, "%s", luaL_checkstring( L, i ) );

    return 0;

}

主要除錯資料輸出

vlc_object_t *p_this = vlclua_get_this( L );

msg_Err( p_this, "error message");