decrypting string

[salvatore]

Hi...

I'm trying to implement rsa algorithm into my program by using libgcrypt 
functions.I had a look at some examples under the test directory but i still 
have some doubts about encrypting and decrypting.Where i can find some 
more example on how to encrypt and decrypt strings with gcry_pk(encrypt|
decrypt)?? I have also some doubts on how to save key on files;what format 
should i use?!

Thanks in advance

Salvo