Boolean - True when a socket handle is available for reading.

SelectRead is an overridden Boolean function that implements the method used to access the Select() API for the protocol stack implementation. 

SelectRead is used to indicate if there are readable socket handles for the protocol stack. SelectRead returns True when the list of socket handles ready for reading would contain a positive non-zero value. 

ATimeout indicates the number of milliseconds to wait for successful completion of the Select() API call. When ATimeout contains IdTimeoutInfinite, MaxLongint is used in the Select() API call. 

SelectRead re-raises any exception occuring in the method using either the EIdSockerr or EIdWrapperException exception types. 

Use Select or SelectReadList get a list of socket handles.