CArchive::Close()

Kiran Pinjala

i have my code like this CArchive ar (&fp, CArchive::store); Serialize(ar); ar.Close(); if ar.Close() is called does it close the file pointer associcated with it(fp.Close)? When i am calling copy or delete fn.s after these line on that file, they return unsuccess. What could be the reason. Thank u.

KIRAN PINJARLA

prasad_som

kiran.pinjarla wrote:

if ar.Close() is called does it close the file pointer associcated with it(fp.Close)?

Yes, it does close CArchive. But not the CFile associated with it.

kiran.pinjarla wrote:

When i am calling copy or delete fn.s after these line on that file

What are these function ? of which class? -- modified at 3:33 Thursday 30th November, 2006 -- modified at 4:59 Thursday 30th November, 2006

Prasad Notifier using ATL | Operator new[],delete[][^]

CPallini

from MSDN:

CArchive::Close
void Close( );
throw( CArchiveException, CFileException );

Remarks

Flushes any data remaining in the buffer, closes the archive, and disconnects the archive from the file. No further operations on the archive are permitted. After you close an archive, you can create another archive for the same file or you can close the file.

The member function Close ensures that all data is transferred from the archive to the file, and it makes the archive unavailable. To complete the transfer from the file to the storage medium, you must first use CFile::Close and then destroy the CFile object.

i.e. CArchive::Close does NOT close the related CFile. perhaps your is not a CFile, but MSDN also states:

CFile( int hFile );
[...]
The constructor with one argument creates a CFile object that corresponds to an existing operating-system file identified by hFile. No check is made on the access mode or file type. When the CFile object is destroyed, the operating-system file will not be closed. You must close the file yourself.

kiran.pinjarla wrote:

When i am calling copy or delete fn.s after these line on that file, they return unsuccess

what are you doing? :confused: hope that helps...

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

Kiran Pinjala

Thank you capallini. But if i call fp.Close() after ar.Close() i am getting an expection.

KIRAN PINJARLA

toxcct

dear, <pre></pre> tags are for posting code samples, not quotation, because you're breaking the page... thank you ;)

You don't know where to start ? ask a good friend

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prasad_som

You need to call CFile::Close before CArchive::Close.

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Nibu babu thomas

prasad_som wrote:

You need to call CFile::Close before CArchive::Close.

You are wrong. CArchive does not close the file object. This is the source code...

void CArchive::Close()
{
ASSERT_VALID(m_pFile);

Flush();
m\_pFile = NULL; // --> Just detaches the file pointer that's all, but doesn't close

}

Nibu thomas A Developer Programming tips[^] My site[^]

prasad_som

I think you replying to my previous reply. Haven't you seen I've already modified it?

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CPallini

Since the following snipped of code works fine on my system:

    CFile file;
MyObject obj;
file.Open("foo.txt",CFile::modeWrite|CFile::modeCreate);
CArchive ar(&file, CArchive::store);
obj.Serialize(ar);
ar.Close();
file.Close();

hope that helps. :confused:

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

Nibu babu thomas

prasad_som wrote:

I think you replying to my previous reply. Haven't you seen I've already modified it?

No I didn't see but still why are you saying that CFile::Close should be called before CArchive:Close. Why what's the reason?

Nibu thomas A Developer Programming tips[^] My site[^]

prasad_som

:doh: You are right.

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Kiran Pinjala

Yes. I was wrong. It was not this fp.Close() which was causing the exception. It was another Close(). Anyhow learned a few new things. Thank you all.

KIRAN PINJARLA

Viorel

prasad_som wrote:

You need to call CFile::Close before using CArchive::Close

In my opinion the file must be closed after closing the archive. Otherwise it will be impossible to flush the last data kept in an internal buffer of CArchive. If the CFile and CArchive objects are created on the stack, then they will be closed automatically in right order.

prasad_som

Viorel. wrote:

In my opinion the file must be closed after closing the archive

You are right.

Prasad Notifier using ATL | Operator new[],delete[][^]

CPallini

OK, dear... :):-D:) but what does it mean because you're breaking the page...? I cannot understand :confused:, please explain to me. :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.