VC++执行错误

[zhaomiaoqianran]

--------------------Configuration: Draw - Win32 Debug--------------------
Linking...
DrawDoc.obj : error LNK2001: unresolved external symbol "protected: virtual void __thiscall CDraw::Serialize(class CArchive &)" (?Serialize@CDraw@@MAEXAAVCArchive@@@Z)
DrawDoc.obj : error LNK2001: unresolved external symbol "public: virtual struct CRuntimeClass * __thiscall CLine::GetRuntimeClass(void)const " (?GetRuntimeClass@CLine@@UBEPAUCRuntimeClass@@XZ)


DrawDoc.h中
public:
CLine* AddLine(short ColorPen,short ColorBrush,short LineWide,short LineType,short Layer,int id_only,float X1,float Y1,float X2,float Y2);
DrawDoc.cpp中加代码后的错误

[PcrazyC]

函数的声明和定义不同,自己检查函数的声明和定义部分

[tgh621]

Serialize和etRuntimeClass(void)函数可能忘了实现了，或者函数名，参数，返回实现的时候写错了