> BlobStream := TblobStream.Create(IBOQUERY1FOTO, bmReadWrite);
>
> I'm getting error:
>
> Projetct Projetct1.exe raised exception class EInvalidCast
> with message 'Invalid class typecast'. Process stopped. Use
> Step or Run to continue

Use the TDataset.CreateBlobStream() method where all the plumbinb is done
for you using inheritance.

Jason Wharton