CArchive串行化读取报错

[lvbajiao]

建了个对话框工程，新建了一个类CMydata
Mydata.h

struct IP_AND_INDEX
{
	CString strip[10];
	int index[10];
};

class CMydata : public CObject  
{
	CString fname;
	IP_AND_INDEX storeinfo;
	int nummap;
	DECLARE_SERIAL(CMydata)
public:
	CMydata(CString s1="",int num=0);
	void Serialize(CArchive& ar);
	int GetNummap();
	void SetFileName(CString str) {fname=str;}
	void GetFileName(CString &str) {str=fname;}
	void AddMap(CString str);
	virtual ~CMydata();

};

Mydata.cpp

IMPLEMENT_SERIAL(CMydata, CObject,2 )

CMydata::CMydata(CString s1,int num):fname(s1),nummap(num)
{
	for(int i=0;i<10;i++)
	{
		storeinfo.index [i]=0;
		storeinfo.strip [i]="";
	}
}

CMydata::~CMydata()
{

}

int CMydata::GetNummap ()
{
	return nummap;
}

void CMydata::AddMap (CString str)
{
	int num=GetNummap();
	if(num<10)
	{
		storeinfo.index [num]=num+1;
		storeinfo.strip [num]=str;
	}
	nummap++;
}
void CMydata::Serialize(CArchive& ar)
{
	CObject::Serialize(ar);
	if (ar.IsStoring())
	{
		// TODO: add storing code here
		ar<<fname;
		for(int i=0;i<nummap;i++)
			ar<<storeinfo.strip[i]<<storeinfo.index [i];
	}
	else
	{
		// TODO: add loading code here
		ar>>fname;
		for(int i=0;i<nummap;i++)
			ar>>storeinfo.strip[i]>>storeinfo.index [i];
	}
}

序列化写入函数（顺利执行）：

void CSerializeDemoDlg::OnButtonsave() 
{
	// TODO: Add your control notification handler code here
	CFile file;
	CFileException fe;
	if(!file.Open ("D:\\newpro\\map.dat",CFile::modeCreate|CFile::modeNoTruncate
						|CFile::modeWrite|CFile::shareExclusive,&fe))
	{
		fe.ReportError ();
		return;
	}
	file.SeekToEnd ();
	CArchive ar(&file,CArchive::store);
	
	CMydata *pd1=new CMydata;
	CMydata *pd2=new CMydata;
	CMydata *pd3=new CMydata;
	pd1->SetFileName ("d1.txt");
	pd1->AddMap ("10.0.188.11");
	pd2->SetFileName ("d2.mp3");
	pd2->AddMap ("10.0.188.22");
	pd2->AddMap ("10.0.188.222");
	pd3->SetFileName ("d3.jpeg");
	pd3->AddMap ("10.0.188.3");
	pd3->AddMap ("10.0.188.33");
	pd3->AddMap ("10.0.188.133");

	ar<<pd1<<pd2<<pd3;
	ar.Flush();
	ar.Close();
	file.Close ();
	delete pd1;
	delete pd2;
	delete pd3;
	MessageBox("store ok");
}

序列化读取函数（弹出对话框提示"D:\newpro\map.mat格式错")：

void CSerializeDemoDlg::OnButtonload() 
{
	// TODO: Add your control notification handler code here
	CFile file;
	CFileException fe;
	if(!file.Open ("D:\\newpro\\map.dat",CFile::modeRead,&fe))
	{
		fe.ReportError ();
		return;
	}
	CArchive ar(&file,CArchive::load);
	
	CMydata *pd1=new CMydata("",1);
	CMydata *pd2=new CMydata("",2);
	CMydata *pd3=new CMydata("",3);
	ar>>pd1>>pd2>>pd3;//这句无法执行了
	ar.Flush();
	ar.Close();
	file.Close ();
}

[yanjingxiong203512]

//CMydata *pd1=new CMydata("",1);
//CMydata *pd2=new CMydata("",2);
//CMydata *pd3=new CMydata("",3);
CMydata *pd1=0;
CMydata *pd2=0;
CMydata *pd3=0;
ar>>pd1>>pd2>>pd3;//CArchive的重载>>操作符会根据CRuntimeClass的规格new出3个CMydata对象(使用无参构造函数)，指针传给pd1,pd2,pd3,因此楼主new的三个对象会无法释放，而传入的参数1、2、3会失效。这样造成的结果就是写入的数据和读出的数据不一致，nummap始终等于0，可以这样修改
void CMydata::Serialize(CArchive& ar)
{
CObject::Serialize(ar);
CObject::Serialize(ar);
if (ar.IsStoring())
{
// TODO: add storing code here
ar<<fname;
ar<<nummap;
for(int i=0;i<nummap;i++)
ar<<storeinfo.strip[i]<<storeinfo.index [i];
}
else
{
// TODO: add loading code here
int a=0;
ar>>fname;
ar>>a; //读出nummap
for(int i=0;i<a;i++)
ar>>storeinfo.strip[i]>>storeinfo.index [i];
}

}

[lvbajiao]

果然，改了后正确。原来>>的过程是这样的呀，谢谢你