format of container of memory address problem

hi, i'm working on an anticheat but now i have problem at detecting client program version:

i have problem with that

Code:

---



void* FindVersion(void)
{

        return (void*)*(DWORD*)0x01EA2B00;
}



struct cl_funcs_s        ofuncs;
cl_funcs_s *pfuncs        = (cl_funcs_s*) FindVersion();

---

it doesn't return address right, so it crash application

if i just make

Code:

---

struct cl_funcs_s        ofuncs;
cl_funcs_s *pfuncs        = (cl_funcs_s*) 0x01EA2B00;

---

so it is all ok, but i need function there, i think i'm useing wrong format for return

Accessing the contents of any specific memory address is bad news. The actual address where the item in question is located will vary with the linker and the exact code being linked. I'm not surprised that dereferencing some "random" pointer is causing a crash.

i know that, but i need it =\
crash is caused only by my function returned address, if i just writedown an address instead of function calling returning it, it's all ok

Do you really mean to READ the value at 0x01EA2B00, or return a pointer of that value? Since the first fragment you post reads what is at that memory address, whilst the second code-fragment is just setting the pointer to a permanent value.

--
Mats

i think i need to return a pointer of that value

So then you should remove the star between void * and DWORD * casts. By the way, you don't need to cast twice...

--
Mats

Quote:

---

return (void*)(DWORD*)0x01EA2B00;

---

still crashes

Quote:

---

return (void*)0x01EA2B00;

---

crashes too =\

And your pfuncs = 0x01EA... doesn't? Very strange.

--
Mats

no, my 2nd code with just address ,from 1st post here works fine =\

Could you post a more complete example of working/nonworking code? Because I don't really see how it would be different - in fact, if the compiler is optimizing things, it would even make the function into a constant assignment.

--
Mats

i use visual studio 2008

working code

Code:

---

struct cl_funcs_s        ofuncs;
cl_funcs_s *pfuncs        = (cl_funcs_s*) 0x01EA2B00;

---

non working code

[os.cpp]

Code:

---

void* FindVersion(void)
{

        return (void*)0x01EA2B00;
}

---

[main.cpp]

Code:

---

#include "os.cpp"

struct cl_funcs_s        ofuncs;
cl_funcs_s *pfuncs        = (cl_funcs_s*) FindVersion();

---

Sorry, not able to figure out anything wrong.

--
Mats