Reads a stream of bytes from the specified column offset into the buffer as an array, starting at the given buffer offset.
[Visual Basic] Public Overridable Function GetBytes( _ ByVal i As Integer, _ ByVal dataIndex As Long, _ ByVal buffer() As Byte, _ ByVal bufferIndex As Integer, _ ByVal length As Integer _ ) As Long Implements IDataRecord.GetBytes [C#] public virtual long GetBytes( int i, long dataIndex, byte buffer, int bufferIndex, int length ); [C++] public: virtual __int64 GetBytes( int i, __int64 dataIndex, unsigned char buffer __gc, int bufferIndex, int length ); [JScript] public function GetBytes( i : int, dataIndex : long, buffer : Byte, bufferIndex : int, length : int ) : long;
- The zero-based column ordinal.
- The index within the field where the read operation is to begin.
- The buffer into which to read the stream of bytes.
- The index where buffer is to begin the write operation.
- The number of bytes to read.
The actual number of bytes read.
GetBytes returns the number of available bytes in the field. In most cases this is the exact length of the field. However, the number returned may be less than the true length of the field if GetBytes has already been used to obtain bytes from the field. This may be the case, for example, if the OdbcDataReader is reading a large data structure into a buffer. For more information, see the SequentialAccess setting for CommandBehavior.
If you pass a buffer that is a null value, GetBytes returns the length of the field in bytes.
Conversions are performed based on the underlying capabilities of the ODBC driver. If the conversion is not supported then the method call will fail.
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family