RFX_Binary
Transfers arrays of bytes between the field data members of a CRecordset object and the columns of a record on the data source of ODBC type SQL_BINARY, SQL_VARBINARY, or SQL_LONGVARBINARY.
void RFX_Binary(
CFieldExchange* pFX,
const char* szName,
CByteArray& value,
int nMaxLength = 255
);
Paramètres
pFX
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.szName
The name of a data column.correspondante
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.nMaxLength
The maximum allowed length of the string or array being transferred. La valeur par défaut de nMaxLength est 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.
Notes
Data in the data source of these types is mapped to and from type CByteArray in the recordset.
Exemple
See RFX_Text.
Configuration requise
En-tête: afxdb.h