Remarks
ClassWizard and AppWizard insert specially formatted comment delimiters in your source code files to mark the places in your files that ClassWizard can write to. AFX_FIELD_INIT is used in MFC database applications to mark the beginning and end of record field exchange (RFX) member variable initializations in a recordset class’s constructor:
//{{AFX_DATA_FIELD(classname)
...
//}}AFX_DATA_FIELD
For more information, see AFX_FIELD_MAP and AFX_FIELD.