Re: Can't instantiate abstract class

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Sun, 4 Oct 2009 09:58:54 -0400

Message-ID:

<#fK4QrPRKHA.220@TK2MSFTNGP02.phx.gbl>

Jack wrote:

//------------------------------------------------------------------------
STDMETHOD(CreateFrame)(THIS_ LPCSTR Name,
LPD3DXFRAME *ppNewFrame) PURE;

//------------------------------------------------------------------------
virtual HRESULT __stdcall CreateFrame(LPCTSTR Name, LPD3DXFRAME
*ppNewFrame);

Name parameter is of type LPCSTR in the interface, but LPCTSTR in your
implementation. My guess is, you are building a Unicode build, where
LPCTSTR != LPCSTR.

Error 1 error C2259: 'CAllocateHierarchy' : cannot instantiate
abstract class c:\documents and
settings\garfield\project1\project_sim\project_sim\project_simview.cpp
78 Project_Sim

A little further down that error message, the compiler tells you which
methods are left unimplemented. Too bad you chose to omit that part.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925