DFX_Byte
Transfers single bytes between the field data members of a CDaoRecordset object and the columns of a record on the data source.
void AFXAPI DFX_Byte( CDaoFieldExchange* pFX, LPCTSTR szName, BYTE& value, DWORD dwBindOptions = AFX_DAO_ENABLE_FIELD_CACHE );
- pFX
-
A pointer to an object of class CDaoFieldExchange. This object contains information to define the context for each call of the function.
- szName
-
The name of a data column.
- value
-
The value stored in the indicated data member — the value to be transferred. For a transfer from recordset to data source, the value, of type BYTE, is taken from the specified data member. For a transfer from data source to recordset, the value is stored in the specified data member.
- dwBindOptions
-
An option that lets you take advantage of MFC's double buffering mechanism for detecting recordset fields that have changed. The default, AFX_DAO_ENABLE_FIELD_CACHE, uses double buffering. The other possible value is AFX_DAO_DISABLE_FIELD_CACHE. If you specify this value, MFC does no checking on this field. You must call SetFieldDirty and SetFieldNull yourself.
Note:
You can control whether data is double buffered by default by setting CDaoRecordset::m_bCheckCacheForDirtyFields.
