MatchServer: Calling ZGetObjectA

[cerealnp]

Hey guys, I'm coding at matchserver, and I was trying to call MMatchServer::GetObjectA in order to get the User's UGradeID that's stored at GetOBjectA + 0x44. Everything I got so far was alot of crashes, so I'm here to ask you guys a little help, take a look at my code:

public: class MMatchObject * __thiscall MMatchServer::GetObjectA(struct MUID const &)

int GetGrade(MUID id)
{
	DWORD result;
	__asm
	{
		mov eax, MMATCHSERVER_GETINSTANCE // Class instance
                call eax
                mov ecx, eax

		push id

		mov eax, ZGetObjectA // Calling the function
		call eax
		mov result,eax
	}
	result = result + 0x44; // That's the pointer to User's UGradeID (I guess atleast xP)
	return (int)result;
}

Thanks.

[MentaL]

[Linear88]

I've tried doing this before too.

I guess it's wrong, but it was worth a try.

int GetUGradeID(MUID ObjectUID)
{
	int UGradeID = 0;

	__asm
	{
		mov eax, MMATCHSERVER_GETINSTANCE
		call eax
		mov ecx, eax

		push ObjectUID
		add eax, 50
		mov eax, MMATCHSERVER_GETOBJECTA
		call eax
		mov eax, UGradeID
	}

	return UGradeID;
}

[x1nixmzeng]

PUSH 0; lowid
PUSH highid; unsigned long

[Solaire]

MUID should be passed as reference.

GetGrade(struct MUID &uidPlayer)

Then push uidPlayer.

[Linear88]

Thanks for the help.

[cerealnp]

Thanks Wiz, it doesn't crash anymore at least, the return seems a little bugged though ([12/29/09 15:04:30] Grade: 108148500), but that's fine, I'll find a way to solve it. Thanks again.

@Linear, your code doesn't work, but thanks anyway =D

[Linear88]

Getting weird values.

[cerealnp]

Yeah, me too.

[Lambda]

Try this.

int GetUGradeID(const MUID& ObjectUID)
{
    int UGradeID = 0;

    __asm
    {
        mov eax, MMATCHSERVER_GETINSTANCE
        call eax
        mov ecx, eax

        push ObjectUID
        mov eax, MMATCHSERVER_GETOBJECTA
        call eax
        mov UGradeID, dword ptr ds:[eax+0x44]
    }

    return UGradeID;
}

[cerealnp]

Try this.

int GetUGradeID(const MUID& ObjectUID)
{
    int UGradeID = 0;

    __asm
    {
        mov eax, MMATCHSERVER_GETINSTANCE
        call eax
        mov ecx, eax

        push ObjectUID
        mov eax, MMATCHSERVER_GETOBJECTA
        call eax
        mov UGradeID, dword ptr ds:[eax+0x44]
    }

    return UGradeID;
}

Thanks, but that's giving me the following error:

error C2415: improper operand type

at

mov UGradeID, dword ptr ds:[eax+0x44]

EDIT: BTW, i've tried that:

                mov eax, MMATCHSERVER_GETINSTANCE // Class instance
                call eax
                mov ecx, eax

		push uidObject
		mov eax, ZGetObjectA // Calling the function
		call eax
		mov eax, dword ptr ds:[eax+0x44]
		mov UGradeID, eax

It returns the UGradeID well, but crashes after the command is completed.

Any tips?

[Solaire]

Thanks, but that's giving me the following error:

error C2415: improper operand type

at

mov UGradeID, dword ptr ds:[eax+0x44]

EDIT: BTW, i've tried that:

                mov eax, MMATCHSERVER_GETINSTANCE // Class instance
                call eax
                mov ecx, eax

        push uidObject
        mov eax, ZGetObjectA // Calling the function
        call eax
        mov eax, dword ptr ds:[eax+0x44]
        mov UGradeID, eax

It returns the UGradeID well, but crashes after the command is completed.

Any tips?

Save your registers. (PUSHAD, POPAD)

[Linear88]

Thanks a lot!