what changes should i make if i upgrade my application from 32 bit to 64 bit

Let the compiler work for you and interpret any warning as error :)

Of course, not any error can be warned, for example:

void f(void* p)
{
  DWORD dwAddress((DWORD) p); // would cut the value to its low part without any warning :)
  // DWORD_PTR dwAddress(reinterpret_cast<dword_ptr>(p)); // correct: the adapted type is using
  cout << dwAddress;
}</dword_ptr>

For MFC application,

go to configuration manager and change the setting to win32 to x64.


Framework can take care of converting 32bit application to 64 bit application.