Question

I have following code:

class B{
    protected:
    X *x;
    public:
    function(char *data){
        // access x
        // works fine
    } 
};

class D: public B {
    function2(char *data)
    {
            // access x
            // gets garbage
    } 
};

I have a member variable which is pointer. moreover this pointer is inside "data" but when i access in class D it shows garbage.

can some body please help me…

Answer 1

I’ve put on my psychic debugging hat, and come to the conclusion you’re probably doing something like this:

class Packet
{
public:
  Gizmo* gizmo_;
};

class Processor
{
public:
  void ProcessPacket(char* packet);
};

// ...

Packet packet;
// packet filled with goodies

Processor proc;
proc.ProcessPacket(reinterpret_cast<char*>(&packet.gizmo_));

Am I right?

If so, my guess is that the Gizmo you’re pointing to has somehow fallen out of scope — thereby becoming destroyed — or you performed the cast incorrectly.