A pointer to an object of class CFieldExchange. This object contains information to define the context for each call of the function. For more information about the operations a CFieldExchange object can specify, see the article Record Field Exchange: How RFX 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, the value, of type CByteArray, is taken from the specified data member. For a transfer from data source to recordset, the value is stored in the specified data member.
The maximum allowed length of the string or array being transferred. The default value of nMaxLength is 255. Legal values are 1 to INT_MAX. The framework allocates this amount of space for the data. For best performance, pass a value large enough to accommodate the largest data item you expect.