You could have a look at
Xing, L. & Brendel, V. (2001)
Multi-query sequence BLAST output examination with MuSeqBox.
Bioinformatics 17, 744-745.
If standard C is equally well you might be interested in
*** Abhishek Nayak (10/29/07 07:54):
> Dose anyone knows of a Blast output Parser whose source code is
> written in C++ and is a open source.
> I am in great need of it. If anyone knows of it please reply back.
> Abhishek Nayak