.portnum Property

Function:	Sets/returns the number of currently selected I/O port.
Type:	Enum (pl_io_port_num, byte)
Value Range:	See the list of pl_io_port_num constants in the platform specifications.
See Also:	Line/Port Manipulation With Preselection

Details

Selects a particular I/O port to be manipulated through the io.portstate and io.portenabled properties. Each port groups eight I/O lines. The list of available I/O ports is defined by the pl_io_port_num enum.

Exception Safety

There are a few situations in which an exception may be thrown when getting or setting this property. For more information, see Handling Exceptions.

Exception	Root Cause(s)
std::invalid_argument	The selected I/O port number is invalid.