MFC 之支持串行化的类

MFC中可以串行化的类必须满足以下条件
1 从CObject派生，或者间接派生
2 重写Serialize函数
3 使用DECLARE_SERIAL宏
4 定义不带参数的构造函数
5 在类的实现文件中用IMPLENT_SERIAL宏


在绘图保存的程序中，类CPaints作为保存的基本单元，它里面存储了绘图类型，起始点，终止点三个成员变量。
然后在绘图中每当绘制一幅图都会将CPaints作为保存对象，保存在View类的CObArray类型的变量中。


在文件保存中需要在Document类中保存View类中的m_obArray,加载的时候反之。
主要代码如下所示：

//Paints.h#pragma once// CPaints 命令目标class CPaints : public CObject{public:CPaints();virtual ~CPaints();CPaints(UINT type,CPoint start,CPoint end);void Serialize(CArchive& ar);void Draw(CDC* pDC);private:UINT m_nDrawType;CPoint m_ptOrigin;CPoint m_ptEnd;DECLARE_SERIAL(CPaints)};

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//Paints.cpp// Paints.cpp : 实现文件//#include "stdafx.h"#include "mfcArchive.h"#include "Paints.h"IMPLEMENT_SERIAL(CPaints,CObject,1)// CPaintsCPaints::CPaints(){m_nDrawType = 0;}CPaints::~CPaints(){}// CPaints 成员函数CPaints::CPaints(UINT type,CPoint start,CPoint end){m_nDrawType = type;m_ptOrigin = start;m_ptEnd = end;}void CPaints::Serialize(CArchive& ar){if(ar.IsStoring() ){ar<<m_nDrawType<<m_ptOrigin<<m_ptEnd;}else{ar>>m_nDrawType>>m_ptOrigin>>m_ptEnd;}}void CPaints::Draw(CDC* pDC){CBrush *pBrush = CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));CBrush *pOldBrush = pDC->SelectObject(pBrush);switch(m_nDrawType){case 1:pDC->SetPixel(m_ptEnd,RGB(0,0,0));break;case 2:pDC->MoveTo(m_ptOrigin);pDC->LineTo(m_ptEnd);break;case 3:pDC->Rectangle(CRect(m_ptOrigin,m_ptEnd));break;case 4:pDC->Ellipse(CRect(m_ptOrigin,m_ptEnd));break;}pDC->SelectObject(pOldBrush);}

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void CmfcArchiveDoc::Serialize(CArchive& ar){POSITION ps = GetFirstViewPosition();CmfcArchiveView* pView = (CmfcArchiveView*)GetNextView(ps);if (ar.IsStoring()){// TODO: 在此添加存储代码int a = 5;char b = 'c';CString str("load test");ar<<a<<b<<str;//int nCount = pView->m_obArray.GetSize();ar<<nCount;for(int i=0;i<nCount;i++){ar<<pView->m_obArray.GetAt(i);}}else{// TODO: 在此添加加载代码int a;char b;CString str,strResult;ar>>a>>b>>str;strResult.Format("%d,%c,%s",a,b,str);//AfxMessageBox(strResult);int nCount;CPaints *ps;ar>>nCount;for(int i=0;i<nCount;i++){ar>>ps;pView->m_obArray.Add(ps);}}}

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void CmfcArchiveView::OnDraw(CDC* pDC){CmfcArchiveDoc* pDoc = GetDocument();ASSERT_VALID(pDoc);if (!pDoc)return;// TODO: 在此处为本机数据添加绘制代码int nCount;nCount = m_obArray.GetSize();for(int i=0;i<nCount;i++){( (CPaints*)m_obArray.GetAt(i) )->Draw(pDC);}}