LPVOID    _newPtr;
LPVOID	  _oldPtr = _ptr;
TWWNDINFO twWndInfo = {handle, WndProc};
SIZE_T step = sizeof(TWWNDINFO);
SIZE_T i;

_newPtr = ::HeapAlloc(::GetProcessHeap(), HEAP_ZERO_MEMORY, (_count + 1) * sizeof(TWWNDINFO));
for (i=0; i<_count; i+=step)
	::CopyMemory(_newPtr + (i * step), _ptr + (i * step), sizeof(TWWNDINFO));  // error C2036: 'LPVOID' : unknown size
	
::CopyMemory(_newPtr + ((_count + 1) * step), &twWndInfo, sizeof(TWWNDINFO));  // error C2036: 'LPVOID' : unknown size