Indicates if the IOHandler is ready to perform a read request.
function Readable( AMSec: Integer = IdTimeoutDefault ): Boolean; virtual;
Boolean - True when the connection is ready for the IO request.
Readable is a virtual Boolean function that indicates if the connection for the IOHandler is ready to perform an IO request.
AMSec indicates the number of milliseconds to wait for the IOHandler connection to become ready for the read operation. The default value is IdTimeoutDefault.
In TIdIOHandler, the return value for the method is False.
Readable has no significance in TIdIOHandler, but is provided for compatibility with descendant classes that may not have an overridden implementation of the method.
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