C++ inline ASM

[doitlong]

#include <stdio.h>

class CHello{
public:
	void fun()
	{
		printf("Hello World");
	} 
};

void main()
{
	CHello hello;
	_asm{
		LEA EAX,hello
		CALL [EAX]hello.fun
	};
}

/-------------------------------------------------------------------

error C2411: 'fun' : illegal struct/union member in 'first operand'

-------------------------------------------------------------------/

Tools : VC++6.0

[Alkhimey]

CALL [EAX]hello.fun()

[NoHero]

The thing you are trying to do has following issues:

• You cannot use C++ OOP within a low level language because you do not know how it is implemented and internaly represented by the compiler.
• When you try to do it, and get an hack for a compiler this hack is compiler depended, because any compiler does it another way.
• A member function is (most time) nothing else than a normal function which get's internally a pointer to a structure containing all data members of the class. The problem now: You either don't know how to call the function, because you do not know it's name and you cannot "extract" the internal structure from the class.
• Everything would be mixed up when using virtual members, because they are stored as function pointer table inside the hidden structure.
• And digging as deep as you are trying to do, is not the way it supposed to be. You should get your nose out of this, otherwise it will cause a lot of strange bugs you aren't able to identify or even fix them.

To cut the long story: What you are trying todo is not fine coding style and (nearly) impossible.

[BytePtr]

#include <stdio.h>

char format[] = "%s %s\n";
char hello[] = "Hello";
char world[] = "world";
void main( void )
{
   __asm
   {
      mov  eax, offset world
      push eax
      mov  eax, offset hello
      push eax
      mov  eax, offset format
      push eax
      call printf
      pop  ebx
      pop  ebx
      pop  ebx
   }
}