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who can help me (VC):link error .I am a beginner on VC.Any one can browse my coding?It's easy for a skilled one I think

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drawappDoc.cpp
drawappView.cpp
Generating Code...
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drawappDoc.obj : error LNK2001: unresolved external symbol "public: virtual struct CRuntimeClass * __thiscall CStroke::GetRuntimeClass(void)const " (?GetRuntimeClass@CStroke@@UBEPAUCRuntimeClass@@XZ)
drawappView.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass CStroke::classCStroke" (?classCStroke@CStroke@@2UCRuntimeClass@@A)
drawappView.obj : error LNK2001: unresolved external symbol "public: class CStroke * __thiscall CDrawappDoc::NewStroke(void)" (?NewStroke@CDrawappDoc@@QAEPAVCStroke@@XZ)
Debug/drawapp.exe : fatal error LNK1120: 3 unresolved externals
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