[InsidiousGnomes]

I'm trying to write an extension that hooks the OnTakeDamage event for CS: S and gives more damage for certain weapons for certain players. I've tried to do this with a plugin but it seems that there is no other way to do it other than an extension since both the hacks extension and the hooker extension won't do it. I successfully hooked the event but when I try to write code to check the weapon I get link errors that I'm having a real problem resolving.

int MyExtension::OnTakeDamage(const CTakeDamageInfo &info)
{
     int AttackerIndex = engine->IndexOfEdict(serverents->BaseEntityToEdict(info.GetAttacker()));

}

This code above compiles OK, but then doesn't link. Here's the link error:

error LNK2001: unresolved external symbol "class CBaseEntityList * g_pEntityList" (?g_pEntityList@@3PAVCBaseEntityList@@A)

Here's the other piece of code that's causing link errors:

void MyDelagate::OnDoDamage(CTakeDamageInfo& info){
    
    int client = engine->IndexOfEdict(serverents->BaseEntityToEdict(info.GetAttacker()));
    CPlayer *pPlayer = g_Players.GetPlayerByIndex(client);
    if (!pPlayer)
    {
        g_pSM->LogMessage(g_VAH.getIExtension(), "Client index %d is invalid", client);
        return;
    } else if (!pPlayer->IsInGame()) {
        g_pSM->LogMessage(g_VAH.getIExtension(), "Client %d is not in game", client);
        return;
    }

    IPlayerInfo *pInfo = pPlayer->GetPlayerInfo();
    if (!pInfo)
    {
        g_pSM->LogMessage(g_VAH.getIExtension(), "IPlayerInfo not supported by game");
        return;
    }

    const char *weapon = pInfo->GetWeaponName();
    g_pSM->LogMessage(g_VAH.getIExtension(), "weapon is %s", weapon);
    if (strcmp(weapon, "weapon_knife") == 0){
        info.SetDamage(1000);
    }
}

And here are the link errors caused by the above code:

error LNK2001: unresolved external symbol "class CBaseEntityList * g_pEntityList" 
error LNK2019: unresolved external symbol "public: class CPlayer * __thiscall PlayerManager::GetPlayerByIndex(int)const " (?GetPlayerByIndex@PlayerManager@@QBEPAVCPlayer@@H@Z) referenced in function "public: virtual void __thiscall MyDelegate::OnDoDamage(class CTakeDamageInfo &)" 
error LNK2001: unresolved external symbol "class PlayerManager g_Players"

The thing is that I know where some of these these unresolved symbols are defined:

g_pEntityList is defined in entitylist.cpp
g_Players is defined in PlayerManager.cpp

I've done everything I can think of to get these files to be included in the build process. I went to Tools -> options -> vc++ directories and added the path to both the include files and the source files. I include the .h files for the corresponding cpp files at in the files that use the code. I even went into the project settings -> linker -> additional dependencies and added every single lib file I could find in the HL2SDK.

Note that I have #define GAME_DLL in my project so it might be looking for the definition of these symbols in a dll somewhere. However if I don't #define GAME_DLL I get literally like 1000 errors... so there's no way I can compile without that.

Can anyone give me some suggestions as to what to do?