.lineget Method
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Function: |
Returns the state of the I/O line specified by the num argument. |
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Syntax: |
io.lineget(num as pl_io_num) as low_high |
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Returns: |
Current line state as LOW or HIGH (low_high enum values) |
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See Also: |
Line/Port Manipulation Without Preselection, io.lineset, io.invert |
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Part |
Description |
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num |
See the list of pl_io_num constants in the platform specifications. |
Details
No line preselection with the io.num property is required and the value of io.num 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 I/O line number is invalid. |
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std::system_error |
There was an error reading the value of the selected I/O line. |