Read function for analog output

Hi I am new to programming with NI DAQ. I am using NI USB-6003 with python. First I am trying with C.

I am using the WriteAnalogScalarF64() to write on the analog output. But what is the command to read what value is being output?

ReadAnalogF64() gives error, so I think it only applies to the analog inputs. What I need is a function that gives me what is the value set at analog output.

Thanks.