LNK 2005 à Visual C ++ à Visual Studio 2010

Question

J'essaie de compiler un programme C ++, écrit à l'aide de Visual C ++ 2005 et de MFC, dans MS VS 2010. Malheureusement, je reçois l'erreur suivante lors de la compilation:

Error 2 error LNK2005: "public: virtual __thiscall CMemDC::~CMemDC(void)" (??1CMemDC@@UAE@XZ) already defined in CMemDCImpl.obj Project\Project\Project\uafxcwd.lib(afxglobals.obj) Project.

CMEMDCIMPL a un fichier d'en-tête contenant des définitions de tous les membres de la classe CMEMDCIMPL et du fichier * .CPP avec leurs implémentations.S'il vous plaît aidez-moi à résoudre cette erreur.

Answer 1

You mention that you CMemDCImpl is defined in a cpp file. However, it also seems to be defined in uafxcwd.lib (a library you apparently use). I can think of two possibilities for this error:

1. You're including the cpp of the library you're attempting to use. Usually, when you use a precompiled library, you only need to reference the header file in your own source file and the library at link time. Is it possible that you included the source .cpp files of the library in your own project? If this is the case, simply remove the source .cpp files from your project.
2. You're defining a class of your own that has the same name as the one you're referencing in the library and you have a name clash. The preferred method to fix this issue is to encapsulate the class you defined yourself in a namespace:

.

namespace Foo
{
    class CMemDC
    {
        // ...
    };
}

// Usage:
Foo::CMemDC myMemDC;

Answer 2

Without the actual code, we can only guess. Most likely you have done one of these:

• Implemented CMemDC::~CMemDC() {} twice, maybe a copy-paste that you didn't rename to CMemDCImpl::~CMemDCImpl()
• Implemented CMemDC::~CMemDC() in a header file after CMemDC class definition instead of in the class definition

Answer 3

Solution I use : rename the well known and well used CMemDC class in something as CMemDc

because Microsoft crushed it and Keith or ourselves have not copyrighted it ?!?

in vs2k10 Microsoft dared to crush the name of the CMemDC class of Keith, with some shit.

Yesterday born Microsoft guys : this it's one of the most popular classes that everyone uses since 1997! Gross! Shame on you, Microsoft !

CMemDc - memory DC

// Author: Keith Rule

// Email: keithr@europa.com

// Copyright 1996-1997, Keith Rule

Thank You Keith ! Those "new" and "catastrophic" guys of "the after-Gates" want us to change every "CMemDC" in every sources we have.. What a shame