我自定义了一个类，如下所示：
class CLine : public CObject{public: CPoint m_pointFrom; CPoint m_pointTo; COLORREF m_colorLine; int m_nWidth; CLine() {} CLine(POINT from,POINT to,COLORREF color,int width); CLine& operator=(CLine& line); void Serialize(CArchive& ar); void DrawLine(CDC* pDC); //CLine(){} virtual ~CLine(); DECLARE_SERIAL(CLine);};IMPLEMENT_SERIAL(CLine,CObject,1)
具体的实现函数如下：
CLine::~CLine(){}
// CLine 成员函数CLine& CLine::operator =(CLine &line){ m_pointFrom=line.m_pointFrom; m_pointTo=line.m_pointTo; m_colorLine=line.m_colorLine; m_nWidth=line.m_nWidth; return *this;}void CLine::Serialize(CArchive &ar){ if(ar.IsStoring()) ar<<m_pointFrom<<m_pointTo<<m_colorLine<<m_nWidth; else ar>>m_pointFrom>>m_pointTo>>m_colorLine>>m_nWidth;}void CLine::DrawLine(CDC *pDC){ CPen penNew,*ppenOld; penNew.CreatePen(PS_SOLID,m_nWidth,m_colorLine); ppenOld=pDC->SelectObject(&penNew); pDC->MoveTo(m_pointFrom); pDC->LineTo(m_pointTo); pDC->SelectObject(ppenOld);}CLine::CLine(POINT from, POINT to, COLORREF color, int width){ m_pointFrom=from; m_pointTo=to; m_colorLine=color; m_nWidth=width;}
编译的时候总是出现链接错误，如下所示：
错误 19 fatal error LNK1169: 找到一个或多个多重定义的符号 D:/程序/c++2008/HT/Debug/HT.exe 1 HT错误 6 error LNK2005: "struct AFX_CLASSINIT _init_CLine" (?_init_CLine@@3UAFX_CLASSINIT@@A) 已经在 HT.obj 中定义 HTDoc.obj HT错误 12 error LNK2005: "struct AFX_CLASSINIT _init_CLine" (?_init_CLine@@3UAFX_CLASSINIT@@A) 已经在 HT.obj 中定义 HTView.obj HT错误 18 error LNK2005: "struct AFX_CLASSINIT _init_CLine" (?_init_CLine@@3UAFX_CLASSINIT@@A) 已经在 HT.obj 中定义 Line.obj HT错误 4 error LNK2005: "public: virtual struct CRuntimeClass * __thiscall CLine::GetRuntimeClass(void)const " (?GetRuntimeClass@CLine@@UBEPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 HTDoc.obj HT错误 10 error LNK2005: "public: virtual struct CRuntimeClass * __thiscall CLine::GetRuntimeClass(void)const " (?GetRuntimeClass@CLine@@UBEPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 HTView.obj HT错误 16 error LNK2005: "public: virtual struct CRuntimeClass * __thiscall CLine::GetRuntimeClass(void)const " (?GetRuntimeClass@CLine@@UBEPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 Line.obj HT错误 3 error LNK2005: "public: static struct CRuntimeClass * __stdcall CLine::GetThisClass(void)" (?GetThisClass@CLine@@SGPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 HTDoc.obj HT错误 9 error LNK2005: "public: static struct CRuntimeClass * __stdcall CLine::GetThisClass(void)" (?GetThisClass@CLine@@SGPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 HTView.obj HT错误 15 error LNK2005: "public: static struct CRuntimeClass * __stdcall CLine::GetThisClass(void)" (?GetThisClass@CLine@@SGPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 Line.obj HT错误 1 error LNK2005: "public: static class CObject * __stdcall CLine::CreateObject(void)" (?CreateObject@CLine@@SGPAVCObject@@XZ) 已经在 HT.obj 中定义 HTDoc.obj HT错误 7 error LNK2005: "public: static class CObject * __stdcall CLine::CreateObject(void)" (?CreateObject@CLine@@SGPAVCObject@@XZ) 已经在 HT.obj 中定义 HTView.obj HT错误 13 error LNK2005: "public: static class CObject * __stdcall CLine::CreateObject(void)" (?CreateObject@CLine@@SGPAVCObject@@XZ) 已经在 HT.obj 中定义 Line.obj HT错误 2 error LNK2005: "protected: static struct CRuntimeClass * __stdcall CLine::_GetBaseClass(void)" (?_GetBaseClass@CLine@@KGPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 HTDoc.obj HT错误 8 error LNK2005: "protected: static struct CRuntimeClass * __stdcall CLine::_GetBaseClass(void)" (?_GetBaseClass@CLine@@KGPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 HTView.obj HT错误 14 error LNK2005: "protected: static struct CRuntimeClass * __stdcall CLine::_GetBaseClass(void)" (?_GetBaseClass@CLine@@KGPAUCRuntimeClass@@XZ) 已经在 HT.obj 中定义 Line.obj HT错误 5 error LNK2005: "class CArchive & __stdcall operator>>(class CArchive &,class CLine * &)" (??5@YGAAVCArchive@@AAV0@AAPAVCLine@@@Z) 已经在 HT.obj 中定义 HTDoc.obj HT错误 11 error LNK2005: "class CArchive & __stdcall operator>>(class CArchive &,class CLine * &)" (??5@YGAAVCArchive@@AAV0@AAPAVCLine@@@Z) 已经在 HT.obj 中定义 HTView.obj HT错误 17 error LNK2005: "class CArchive & __stdcall operator>>(class CArchive &,class CLine * &)" (??5@YGAAVCArchive@@AAV0@AAPAVCLine@@@Z) 已经在 HT.obj 中定义 Line.obj HT不知道是啥原因，希望有人指点迷津，本人感激不尽。
