int sqlite3_blob_bytes( sqlite3_blob* blob );
blob
A BLOB handle acquired from sqlite3_blob_open().
The size of the BLOB value, in bytes.
This function returns the size of the referenced BLOB value in
bytes. The size of a BLOB value is fixed and cannot be modified
without a call to INSERT or
UPDATE.
sqlite3_blob_open(), sqlite3_bind_xxx() (refer to sqlite3_bind_zeroblob(),
specifically), zeroblob() [Ap E]