Pawn symbol already defined: "@[email protected]"

Zow · (This post was last modified: 2020-06-24, 06:20 AM by Zow.)

I tried to hook OnScriptInit
Here my main.pwn

Code:
#include <a_samp>

#undef   MAX_PLAYERS

#define MAX_PLAYERS 100

#define YSI_NO_OPTIMISATION_MESSAGE

#define YSI_NO_CACHE_MESSAGE

#define YSI_NO_MODE_CACHE

#define YSI_NO_HEAP_MALLOC

#define YSI_NO_VERSION_CHECK

#include <a_mysql>

#include    <streamer>

#include    <sscanf2>

#include    <Pawn.CMD>

// YSI-Include 5.x

#include <YSI_Data/y_iterate>

#include <YSI_Coding/y_timers>

#include "test.pwn"

#include "test1.pwn"

test.pwn

Code:
#include <YSI_Coding/y_hooks>

hook OnScriptInit()

{

    print("test1");

    return 1;

}

test1.pwn

Code:
#include <YSI_Coding/y_hooks>

hook OnScriptInit()

{

    print("test2");

    return 1;

}

F:\samp\gamemodes\test1.pwn:4 (error) symbol already defined: "@[email protected]"
Install by sampctl package install pawn-lang/[email protected]

**JustMichael** · 2020-06-24, 07:45 AM

Everytime you hook a callback using the `hook` macro, the final name of the callback becomes `hook <callback>@<unique_id>`. Now everytime you include `y_hooks` it generates a new unique number to append to the final callback name. Now as you might be aware, you can not have callbacks/functions of the same name, this doesn't compile.

Now this is what is happening with your issue, you have included `y_hooks` and have hooked the same callback twice, without including `y_hooks` again after the first hook. So the unique generated ID, is the same for each hook, which is why it is not working here. So to fix this issue, include `y_hooks` before you hook the next callback.

So this code below is bad.

Code:

#include <YSI_Coding\y_hooks>



hook OnPlayerConnect(playerid) // Final Callback Name -> [email protected](playerid) 

{

   return 1;

}



// This causes an error due to having the same name

hook OnPlayerConnect(playerid) // Final Callback Name -> [email protected](playerid) 

{

   return 1;

}

This is the fixed version that allows you to hook the same callback again

Code:

#include <YSI_Coding\y_hooks>



hook OnPlayerConnect(playerid) // Final Callback Name -> [email protected](playerid) 

{

   return 1;

}



#include <YSI_Coding\y_hooks>



hook OnPlayerConnect(playerid) // Final Callback Name -> [email protected](playerid) 

{

   return 1;

}