.portget Method
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Function: |
Returns the state of the I/O port specified by the num argument. |
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Syntax: |
io.portget(num as pl_io_port_num) as byte |
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Returns: |
0-255. Each bit of this value corresponds to one member I/O line of the 8-bit port. |
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See Also: |
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Part |
Description |
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num |
See the list of pl_io_port_num constants in the platform specifications. |
Details
No line preselection with the io.portnum property is required and the value of io.portnum will not be changed.
Exception Safety
There are a few situations in which an exception may be thrown when invoking this method. For more information, see Handling Exceptions.
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Exception |
Root Cause(s) |
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std::invalid_argument |
The selected port number is invalid. |
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std::system_error |
There was an error reading the value of the selected port. |