read data from COM port

We wish to use a bar code scanner which connected to COM port. So, how can we read those data (bar code) directly from the COM port using visual basic 4.0 or above. (i.e once the scanner reads data, the code will immediately show on the screen).  Pls state the syntax, the expression and the declaration.
System:
port : COM1/2/3...
baud rate: 9600bps or above
parity: none
data bit: 8
Stop bit: 1
flow control: hardware