function returning memory address

hi 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

Just do this inside the function.
return (void*)0x01EA2B00;

What address is that?

Quote:

---

Originally Posted by _Superman_

Just do this inside the function.
return (void*)0x01EA2B00;

---

i tried that, crashes too

You've introduced a "magic" address into your code.

You can do this sort of weird syntax in the IDE debugger where you see the pointers. Not normal to put it into your code.

i know that working with magic addresses is bad but anyway i need it in my code, 2nd variant of my code works fine but i need a function or anything so i can choose magic address depending on conditions

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();

---

now i really don't know what is wrong ><

The memory layout may change every time you modify your source code. Assuming to find a function body at a specific memory location is one of the worst techniques I have ever seen :eek:
If you need to return the address of a function, the use the function name to determine its address:

Code:

---

void somefunc()
{
}

void* FindVersion()
{
  return reinterpret_cast<void*>( somefunc );
}

---

Can you please elaborate what exactly you are doing? Maybe the template method pattern can be applied for a more robust solution.

Quote:

---

Originally Posted by Owyn

i know that working with magic addresses is bad but anyway i need it in my code, 2nd variant of my code works fine but i need a function or anything so i can choose magic address depending on conditions

---

Are you doing C development on embedded systems?

i figured out my problem, i needed int FindVersion(void){}