[AntiBots]

1# I have to use CString.h or string.h

2# I have to use CVector.h or vector.h

3# How work Ham with Metamod. Because I see that RegisterHam work diferent than Fakemeta or Engine.

Metamod dont exec func in Ham ( Well the function like Player Pre Think ).


Plis, sorry my english.

[jim_yang]

about 1#,2#, if you want your plugins compiled only in windows, you can use stl, if you want them to be compiled in both win and linux, use the library amxx supplied.
about #3, you mean why ham don't hook engine or dll function?

[AntiBots]

Originally Posted by jim_yang about 1#,2#, if you want your plugins compiled only in windows, you can use stl, if you want them to be compiled in both win and linux, use the library amxx supplied.

Thanks

Originally Posted by jim_yang about #3, you mean why ham don't hook engine or dll function?

Well. If I see moduleconfig that dont define any HL Func

PHP Code:

// #define FN_PlayerPreThink PlayerPreThink /* pfnPlayerPreThink() */ 


But the module use PreThink.

How Ham Hook HL or Metamod events?

Else: I have to use define of ARRAYSIZE of winnt or eiface?

[Shadows In Rain]

Originally Posted by jim_yang if you want your plugins compiled only in windows, you can use stl, if you want them to be compiled in both win and linux, use the library amxx supplied.

LOLWUT? STL is part of C++ standart library. It comes with almost compilers.

http://en.wikipedia.org/wiki/Standard_Template_Library
http://en.wikipedia.org/wiki/C%2B%2B_Standard_Library
http://en.wikipedia.org/wiki/Core_language

Also, files with extension ".h" are deprecated, use files without ".h" (read links):
#include <string>
#include <vector>

[jim_yang]

Originally Posted by Shadows In Rain LOLWUT? STL is part of C++ standart library. It comes with almost compilers. http://en.wikipedia.org/wiki/Standard_Template_Library http://en.wikipedia.org/wiki/C%2B%2B_Standard_Library http://en.wikipedia.org/wiki/Core_language Also, files with extension ".h" are deprecated, use files without ".h" (read links): #include <string> #include <vector>

You get me wrong or my poor English sucking.
Of course I know what you try to say.

Originally Posted by BAILOPAN I recommend not using STL in plugins if you intend to distribute as binaries on Linux. It requires linking to libstdc++ which is a world of hurt (in fact, it's really only safe if you use the exact GCC version Valve does, gcc-3.4).

[jim_yang]

Hamsandwish hooks the virtual functions(vfuncs) of a class, to explain clearly, I'll give an example.
Here is the Class Hierachy:

CBaseEntity
    CBaseDelay
        CBaseToggle
            CBaseItem
            CBaseMonster
                CBaseCycler
                CBasePlayer
                CBaseGroup

You can see that CBaseEntity is the base class of all other entity classes.
Here is part of vfuncs from CBasePlayer class

0    CBasePlayer::Spawn(void)
1    CBasePlayer::Precache(void)
2    CBaseEntity::Restart(void)
3    CBaseMonster::KeyValue(KeyValueData_s *)
4    CBasePlayer::Save(CSave &)
5    CBasePlayer::Restore(CRestore &)
6    CBasePlayer::ObjectCaps(void)
7    CBaseEntity::Activate(void)
8    CBaseEntity::SetObjectCollisionBox(void)
9    CBasePlayer::Classify(void)
10   CBaseEntity::DeathNotice(entvars_s *)
11   CBasePlayer::TraceAttack(entvars_s *,float,Vector,TraceResult *,int)
12   CBasePlayer::TakeDamage(entvars_s *,entvars_s *,float,int)

You can see that some functions from CBasePlayer override the original function from CBaseEntity

RegisterHam(Ham_TakeDamage, "player", "my_hook_func", 0 or 1) //pre or post

To hook the function CBasePlayer::TakeDamage, ham first spawn an entity with given classname, because different classes have different TakeDamage function, so we should specify which class we want to hook.
Virtual table(vtbl) stores in each object of a class, it stores the virtual function's address(pointer). When an obj call its virtual function, it will look up the vtbl to find its real address in memory.

CBasePlayer *pPlayer;
pPlayer->Spawn();

Numver 0 - 12 above is the index of these vfuncs in vtbl. You can find these numbers in hamdata.ini from configs folder
Ham does the followings to hook CBasePlayer::TakeDamage function:
(1)spawn a "player" entity
(2)get its vtbl address
(3)get its vtbl index from hamdata(actually this have been done when ham init)
(4)get the vfunc address
(5)generate a trampoline function
(6)changed the original vfunc address in vtbl to the trampoline function address(hooking started)
about the trampoline function, it looks like this:

Tramp()
{
    //prehook
    return_value = my_hook_func(original parameters)
    if(return_value == HAM_SUPERSEDE)
        return
    
    //call the original function
    this->TakeDamage(modified parameters from our prehook function)
    
    //posthook
    my_hook_func()
}

I'm not good at explaining things because of my poor English, so I didn't explain the c++ part, such as class, hierachy, virtual function..., you can find these in any c++ book.
===================
if you want to use ARRAYSIZE, use the hlsdk version

[AntiBots]

@jim: I can use Trampoline.h from Ham, Or I have to make a new?

Is you have time, only show how to hook Ham_Spawn, Example.
Only the code, without explain.
I was traing but sometimes work and others no.

Thanks!!!

[jim_yang]

#include "amxxmodule.h"
#include <windows.h>
#define HOOK_Spawn 0
void *pOriginalFunction = NULL;
void Hook_Spawn()
{
    //save this pointer
    void *pthis;
    __asm mov pthis, ecx;
    //pre hook
    SERVER_PRINT("::Spawn(void) prehook!\n");
    //call original function
    __asm mov ecx, pthis;
    __asm call [pOriginalFunction];
    //post hook
    SERVER_PRINT("::Spawn(void) posthook!\n");
}
void Hook()
{
    //get classname of the entity you want to hook
    const char *classname = CMD_ARGV(1);
    edict_t *pEdict = CREATE_ENTITY();
    CALL_GAME_ENTITY(PLID, classname, &pEdict->v);
    if(pEdict->pvPrivateData == NULL)
    {
        REMOVE_ENTITY(pEdict);
        return;
    }
    //get this pointer
    void *pthis = pEdict->pvPrivateData;
    //get vtable
    void **vtbl = *(void ***)pthis;
    REMOVE_ENTITY(pEdict);
    if(vtbl == NULL)
        return;
    
    int **ivtbl = (int **)vtbl;
    //get the original function
    pOriginalFunction = (void *)ivtbl[HOOK_Spawn];
    
    //patch original function to our function
    DWORD oldflags;
    if(VirtualProtect(&ivtbl[HOOK_Spawn], sizeof(int *), PAGE_READWRITE, &oldflags))
    {
        ivtbl[HOOK_Spawn] = (int *)Hook_Spawn;
    }
}
void OnMetaAttach()
{
    REG_SVR_COMMAND("hook", Hook);
}

ecx store this pointer, you need to do some calculate to get the edict_t *
in windows this calc is

mov eax, [ecx + 4];  get this->pev
mov eax, [eax + 520]; get pev->pContainingEntity
mov pEdict, eax

[pRoxxxDD]

Originally Posted by jim_yang [code] mov eax, [ecx + 4]; get this->pev mov eax, [eax + 520]; get pev->pContainingEntity mov pEdict, eax

Can you explain it ?

[AntiBots]

Wow Jim, Work perfect. Also the edict_t

Now I am Traing to Transport Trampoline from Ham to my Module. First Test Work