Question

求MFC大神解释下这个错误是怎么回事

nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual void __thiscall CWnd::PreSubclassWindow(void)" (?PreSubclassWindow@CWnd@@UAEXXZ) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual int __thiscall CWnd::PreCreateWindow(struct tagCREATESTRUCTA &)" (?PreCreateWindow@CWnd@@UAEHAAUtagCREATESTRUCTA@@@Z) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual int __thiscall CWnd::Create(char const *,char const *,unsigned long,struct tagRECT const &,class CWnd *,unsigned int,struct CCreateContext *)" (?Create@CWnd@@UAEHPBD0KABUtagRECT@@PAV1@IPAUCC
reateContext@@@Z) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "protected: virtual void __thiscall CWnd::PostNcDestroy(void)" (?PostNcDestroy@CWnd@@MAEXXZ) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual void __thiscall CWnd::OnFinalRelease(void)" (?OnFinalRelease@CWnd@@UAEXXZ) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual void __thiscall CWnd::AssertValid(void)const " (?AssertValid@CWnd@@UBEXXZ) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual void __thiscall CWnd::Dump(class CDumpContext &)const " (?Dump@CWnd@@UBEXAAVCDumpContext@@@Z) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual int __thiscall CWnd::DestroyWindow(void)" (?DestroyWindow@CWnd@@UAEHXZ) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "protected: virtual long __thiscall CWnd::DefWindowProcA(unsigned int,unsigned int,long)" (?DefWindowProcA@CWnd@@MAEJIIJ@Z) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "protected: virtual long (__stdcall** __thiscall CWnd::GetSuperWndProcAddr(void))(struct HWND__ *,unsigned int,unsigned int,long)" (?GetSuperWndProcAddr@CWnd@@MAEPAP6GJPAUHWND__@@IIJ@ZXZ) already defined in
mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual int __thiscall CWnd::PreTranslateMessage(struct tagMSG *)" (?PreTranslateMessage@CWnd@@UAEHPAUtagMSG@@@Z) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib(wincore.obj) : error LNK2005: "public: virtual int __thiscall CWnd::OnToolHitTest(class CPoint,struct tagTOOLINFOA *)const " (?OnToolHitTest@CWnd@@UBEHVCPoint@@PAUtagTOOLINFOA@@@Z) already defined in mfc42d.lib(MFC42D.DLL)
nafxcwd.lib
。。。老是上面这样的重复
Debug/Test.exe : fatal error LNK1120: 1 unresolved externals

Answer 1

应该是头文件包含的问题，也可能和工程设置有点关系，qq私信发送给你了，可以在qq上帮你具体看看。

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Answer 2

可能是头文件重复编译了，在头文件最上面加一行：#(编译的英文单词p开头的) once