Re: Serailize problem

From:

David Wilkinson <no-reply@effisols.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 10 Mar 2009 07:45:11 -0400

Message-ID:

<uxUcqWXoJHA.6064@TK2MSFTNGP06.phx.gbl>

97612 wrote:

I use SDI with DOC/VIEW architecture. I have a CString vector that stroes
some files' path. I want to let the program to save the CString vector when
the program exist, and load back to the CString vector when the program
excutes next time. So I can get the files' path. Below are part of source
code.

//***************************************
in .h:
class CMyDoc : public CDocument
{
protected: // create from serialization only
    CePhotoSyncDoc();
    DECLARE_DYNCREATE(CePhotoSyncDoc)
public:
        std::vector<CString> m_vThuSelFileName;
}
-------------------------------------------------------------------------------
in .cpp:
IMPLEMENT_DYNCREATE(CMyDoc, CDocument)

void CMyDoc::Serialize(CArchive& ar)
{
    CObject::Serialize( ar );
    unsigned int vectorSize = 0;

    if(ar.IsStoring())
    {
        // TODO: add storing code here
        ar << m_vThuSelFileName.size();
        for(unsigned int i = 0; i < m_vThuSelFileName.size(); i ++)
        {
            ar << m_vThuSelFileName.at(i);
        }
    }
    else
    {
        // TODO: add loading code here
        ar >> vectorSize;
        for(unsigned int i = 0; i < vectorSize; i ++)
        {
            ar >> m_vThuSelFileName.at(i);
        }
    }
}
//**********************************************

Question1. How?
But I don't know how to let the program(not user clicking "Save As" or "Save
File") to utilize the DOC's serialization function storing the CString vector
automaticly, and let the program loading back the CString vector automaticly.
Any suggestions? Thanks.

Question2. When?
And assume I know how to do that. Should I do the operation when user click
the exist button or x button at the top right position of the window?

It sounds that you want to save some strings that are properties of the
application as a whole, not of each document.

I would not use MFC serialization for this (I would not use it for document
serialization either, but that's another issue).

Data of this kind is normally placed in an AppName subdirectory of

Documents and Settings\UserName\Application Data

(on XP). You can get this directory on any OS using SHGetSpecialFolderPath()
with CSIDL_APPDATA.

I would just write the strings in some simple text format, or in XML if the
strings have some hierarchical structure. Write the strings in ExitInstance(),
and read them back in InitInstance().

--
David Wilkinson
Visual C++ MVP