readme.txt

一个简单的记录集类

/////////////////////////////////////////////////////////////////////////

        ------------------- a file record set -----------------------
        ---------- this article was contributed by weedlee -----------
        ----------------- email: [e-mail] --------------------
        ---------------------- 03/06/2000 ---------------------------

/////////////////////////////////////////////////////////////////////////

    it's a simple class used to read and write records form a sigle file, 
 you can define your record struct in heard file and have some little change
 in cpp file, then you can use it just like a record set.

 1. source Files

    header file:          fileset.h
    implementation file:  fileset.cpp

    class:                cfileset

 2. definition

    modify header file such as:

    a) your record struct

    struct _DBRECORD
    {
        int             NO;
        unsigned char   Name[11];
        int             Type;
        long            Value;
        unsigned char   Desc[51];
        int             DBNO;
        int             Addr;
    };

    b) your member variables binded with your record struct

    // field member variables
    int				NO;
    CString			Name;
    int				Type;
    long			Value;
    CString			Desc;
    int				DBNO;
    int				Addr;

 3. updatedata

    modify implementation file such as:

    void CFileSet::UpdateData(BOOL bUpdate)
    {
        if (bUpdate)
        {
            record.NO = NO; // position+1;
            strcpy((char *)record.Name,LPCTSTR(Name));
            record.Name[10] = 0;
            record.Type = Type;
            record.Value = Value;
            strcpy((char *)record.Desc,LPCTSTR(Desc));
            record.Desc[50] = 0;
            record.DBNO = DBNO;
            record.Addr = Addr;
        }
        else
	{
            NO = record.NO;
            Name.Format("%s",record.Name);
            Type = record.Type;
            Value = record.Value;
            Desc.Format("%s",record.Desc);
            DBNO = record.DBNO;
            Addr = record.Addr;
        }
    }

 4. usage

    such as:

    ...

    CFileSet set;
    set.Open("t2.dat");
    while (!set.IsEOF())
    {
        // your code here
        set.MoveNext();
    }
    set.Close();

    ...

    you can use it just like a CRecordSet object

 5. about enhanced functionality

    it couldn't support primary key or index;
    and it couldn't support sort also.

    perhaps the next time i will add them.

 6. thanks

    it's very simple, perhaps you can enhanced it by yourself;
    if your have any advice please email to me.
    thank you.

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