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--- Forum: Pawn Scripting (https://forum.open.mp/forumdisplay.php?fid=10)
--- Thread: [Pawn] symbol already defined: "@yH_OnScriptInit@003" (/showthread.php?tid=1124)
symbol already defined: "@yH_OnScriptInit@003" - Zow - 2020-06-24
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: "@yH_OnScriptInit@003"
Install by sampctl package install pawn-lang/[email protected]
RE: symbol already defined: "@yH_OnScriptInit@003" - JustMichael - 2020-06-24
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 -> OnPlayerConnect@001(playerid)
{
? ?return 1;
}
// This causes an error due to having the same name
hook OnPlayerConnect(playerid) // Final Callback Name -> OnPlayerConnect@001(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 -> OnPlayerConnect@001(playerid)
{
? ?return 1;
}
#include <YSI_Coding\y_hooks>
hook OnPlayerConnect(playerid) // Final Callback Name -> OnPlayerConnect@002(playerid)
{
? ?return 1;
}