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 Overrides Function GetBytes( _ ByVal ordinal As Integer, _ ByVal dataIndex As Long, _ ByVal buffer As Byte(), _ ByVal bufferIndex As Integer, _ ByVal length As Integer _ ) As Long
C# public override long GetBytes( int ordinal, long dataIndex, byte buffer, int bufferIndex, int length );
ordinal An ordinal number indicating the column from which the value is obtained. The numbering is zero-based.
dataIndex The index within the column value from which to read bytes.
buffer An array in which to store the data.
bufferIndex The index in the array to start copying data.
length The maximum length to copy into the specified buffer.
The 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, when the SADataReader is reading a large data structure into a buffer.
If you pass a buffer that is a null reference (Nothing in Visual Basic), GetBytes returns the length of the field in bytes.
No conversions are performed, so the data retrieved must already be a byte array.
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