Virtual Functions and pointers

Hi to everyone

I'm writing this post because I have some problems accessing a function of a class through a pointer.

This is the situation:
I have a pointer to a class. The class inherits two virtual functions from an abstract base class.

The problem is the following:
When I try to call the function from the pointer I receive the following error at run-time: "Unhandled exception at 0x004251d8 in MyApplication.exe: 0xC0000005: Access violation reading location 0x00000000."

Can somebody help me, please?

here the declaration of the pointer and the functions:

Code:

[COLOR=green]//baseclass.h[/COLOR]
[COLOR=blue]class[/COLOR] MyBaseClass
{
[COLOR=blue]public[/COLOR]:
  [COLOR=blue]virtual void[/COLOR] Start() = 0;
  [COLOR=blue]virtual void[/COLOR] Stop() = 0;
};
[COLOR=green]//class.h[/COLOR]
[COLOR=blue]class[/COLOR] MyClass : [COLOR=blue]public[/COLOR] MyBaseClass
{
[COLOR=blue]public:[/COLOR]
  MyClass();
  [COLOR=blue]void [/COLOR]Stop();
};
[COLOR=green]//pointer[/COLOR]
[COLOR=blue]static[/COLOR] MyClass *MyClassptr;
 
[COLOR=green]//myclass.cpp[/COLOR]
MyClass::MyClass()
{
  MyClassptr=[COLOR=blue]this[/COLOR];
}
[COLOR=green]//main.cpp[/COLOR]
[COLOR=blue]int[/COLOR] main()
{
    MyClass MyNewClass;
    MyClassptr->Start();
    [COLOR=blue]return[/COLOR] 0;
}

 

Hi,
First of all you have to define the Start() and Stop() functions.Otherwise it will take MyClass as abstract class.

After Definining these fucntions i run this same code it works fine

so try it again it works
For further queries kindly revert back