AlliedModders - Need some basic help with extensions

Hello! I'm very new to sourcemod and just passed through these tutorials:

https://wiki.alliedmods.net/Introduc...rceMod_Plugins
https://wiki.alliedmods.net/Writing_Extensions

However, I still have some questions which I did not find answers to.

Code from the tutorial (extension.cpp):

PHP Code:


		
			
#include "extension.h"



/**

 * @file extension.cpp

 * @brief Implement extension code here.

 */



FirstExtension g_FirstExtension;        /**< Global singleton for extension's main interface */



SMEXT_LINK(&g_FirstExtension);



IForward *g_pSayChat = NULL;



cell_t SquareNumber(IPluginContext *pContext, const cell_t *params)

{

    cell_t number = params[1];

    return number * number;

}



const sp_nativeinfo_t MyNatives[] =

{

    { "SquareNumber",    SquareNumber },

    { NULL,            NULL },

};



void FirstExtension::SDK_OnAllLoaded()

{

    sharesys->AddNatives(myself, MyNatives);

    g_pSayChat = forwards->CreateForward("OnPlayerSayChat", ET_Event, 2, NULL, Param_Cell, Param_String);

}



void FirstExtension::SDK_OnUnload()

{

    forwards->ReleaseForward(g_pSayChat);

}



/** Fires the say chat event in plugins.  Returns true to allow the text, false to block. */

bool FireChatEvent(int client, const char *text)

{

    if (!g_pSayChat)

    {

        return true;

    }



    cell_t result = 0;

    g_pSayChat->PushCell(client);

    g_pSayChat->PushString(text);

    g_pSayChat->Execute(&result);



    if (result == Pl_Handled)

    {

        return false;

    }



    return true;

}

I don't understand, when exactly FireChatEvent gets called?

I tried to include this simple extension in tutorial plugin's code:
first_ext.inc:

PHP Code:


		
			
#if defined _firstext_included

#endinput

#endif

#define _firstext_included



/**

 * Returns the square of a number.

 *

 * @param num    Number to square.

 * @return    The square of num.

 */

native int SquareNumber(num);





/**

* @brief Called whenever a client says something in chat.

*

* @param client    Index of the client.

* @param text        String containing the say text.

* @return         Plugin_Handled to block text from printing, Plugin_Continue otherwise.

*/

forward Action OnPlayerSayChat(int client, const char[] text);



/**

 * Do not edit below this line!

 */

public Extension:__ext_firstext = 

{

    name = "First extension",

    file = "first.ext.2.csgo",

#if defined AUTOLOAD_EXTENSIONS

    autoload = 1,

#else

    autoload = 0,

#endif

#if defined REQUIRE_EXTENSIONS

    required = 1,

#else

    required = 0,

#endif

};

helloworld.sp:

PHP Code:


		
			
#include <sourcemod>

#include <sdktools>

#include <first_ext>



public Plugin myinfo =

{

    name = "My First Plugin",

    author = "Me",

    description = "My first plugin ever",

    version = "1.0",

    url = "http://www.sourcemod.net/"

};



ConVar g_cvarMySlapDamage = null;



public void OnPluginStart()

{

    PrintToServer("Hello world!");

    RegAdminCmd("sm_myslap", Command_MySlap, ADMFLAG_SLAY);

    

    g_cvarMySlapDamage = CreateConVar("sm_myslap_damage", "1", "Default slap damage");

    AutoExecConfig(true, "plugin_myslap");

    

    LoadTranslations("common.phrases.txt"); // Required for FindTarget fail reply

}

 

public Action OnPlayerSayChat(int client, const char[] text)

{

    PrintToChat(client, "[SM] %d", SquareNumber(5)); 

    return Plugin_Continue;

}

REQUIRE_EXTENSIONS is defined in core.inc and my plugin loads successfully so I assume that the extension is also loaded. However, when I say something in chat I don't get "[SM] 25" printed as I expected.

So, either `OnPlayerSayChat` is never fired (in that case, what sould I do to actually get it working?) or it is fired and I just made some mistakes so I don't get expected result. If latter, what are these mistakes and how to fix them?

Thanks!