Use this method to prepare to read a blob value; the value is
available following invocation. Use
to check for a
NULL value; use
getLength() to get the actual length of the
blob, and to check for truncation.
sets the current read/write position to the point following the
end of the data which was read.
int getValue ( void* data, Uint32 bytes )
This method takes two parameters. The first of these is a
pointer to the
data to be read; the
second is the number of
bytes to be
0 on success,