Getting data from the nstask - communicating with command line - objective c

I know how to send data to the task:

NSData *charlieSendData = [[charlieImputText stringValue] dataUsingEncoding:NSUTF8StringEncoding];
[[[task standardInput] fileHandleForWriting] writeData:charlieSendData];

But how do I get what the task responds with??

Elijah