This documentation is archived and is not being maintained.


Transfers currency data between the field data members of a CDaoRecordset object and the columns of a record on the data source.

void AFXAPI DFX_Currency(
   CDaoFieldExchange* pFX,
   LPCTSTR szName,
   COleCurrency& value,


A pointer to an object of class CDaoFieldExchange. This object contains information to define the context for each call of the function. For more information about the operations a CDaoFieldExchange object can specify, see the article DAO Record Field Exchange: How DFX Works.
The name of a data column.
The value stored in the indicated data member — the value to be transferred. For a transfer from recordset to data source, this value is taken from the specified data member, of type COleCurrency. For a transfer from data source to recordset, the value is stored in the specified data member.
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.

These options are explained further in the article DAO Recordset: Binding Records Dynamically.

Note   You can control whether data is double buffered by default by setting CDaoRecordset::m_bCheckCacheForDirtyFields.


Data is mapped between type DAO_CURRENCY in DAO and type COleCurrency in the recordset.


See DFX_Text.

See Also

MFC Macros and Globals | DFX_Text | DFX_Bool | DFX_DateTime | DFX_Long | DFX_Short | DFX_Single | DFX_Double | DFX_Byte | DFX_Binary | DFX_LongBinary | CDaoFieldExchange::SetFieldType