错在哪？??

[k2000]

class cline : public CObject
{
protected:
cline()
{}
DECLARE_SERIAL(cline)
public:
CString txt;
cline(CString mtxt)
{
txt = mtxt;
}
virtual void Serialize(CArchive &ar);
};

class CA28Doc : public CDocument
{
protected: // create from serialization only
CA28Doc();
DECLARE_DYNCREATE(CA28Doc)

// Attributes
public:
CTypedPtrArray<CObArray,cline*>m_line;

void CA28Doc::OnButt1()
{
CFile file;
file.Open( "llk.a28", CFile::modeCreate |CFile::modeNoTruncate
| CFile::modeReadWrite
| CFile::shareDenyNone);
file.SeekToEnd();
CString str = "this";
cline* pline = new cline(str);
m_line.Add(pline);
char buf[512];
CArchive ar( &file, CArchive::store, 512, buf );
Serialize(ar);
delete m_line.GetAt(0);
m_line.RemoveAt(0);

文件打开后却不能读取数据,我错在哪儿？

[k2000]

补充一点：
void CA28Doc::Serialize(CArchive& ar)
{
if (ar.IsStoring())
{
// TODO: add storing code here
m_line.Serialize(ar);
}
else
{
// TODO: add loading code here
m_line.Serialize(ar);
}
}

IMPLEMENT_SERIAL(cline,CObject,1)

void cline::Serialize(CArchive &ar)
{
if(ar.IsStoring())
ar << txt;
else
ar >> txt;
}

[k2000]

对不起，实在是没分了，帮帮忙好吗？

[davidprg]

seektobegin试试

[k2000]

没有人知道吗？

[k2000]

各位兄长,拜托啦!帮帮忙吧!

[k2000]

哎!-----还有高手吗？？还是分数太低???