[libpq] Return value of int

Hello,

How can i use libpq to return an int value when i access an INT or INT4
value
For example :
result = PQexec (connection,"SELECT integervalue FROM integertable");

I have followed the example nr 3 in the pogrammers guide but i still get
a
char * when i use PQgetvalues

Thanks in advance,

Henk Jan Barendregt