Default constructor.

Default destructor.

This method checks whether the AO is currently in use or not If it is in use, then the client's request is completed with KErrInUse

This method cancels the active phase of the retrieval It is called from the CActive::Cancel() method.

This method deallocates the buffer used to hold the retrieved data

Does nothing. Should be overriden in concrete derived classes.

This method processes the completion of each asynchronous phase of the retrieval If phase 1 is now complete, it starts phase 2 If phase 2 is now complete, it complete's the client's request.

This method performs the first phase of the retrieval of a variable length buffer The first phase consists of retrieving the size of buffer to be read

This method performs the second phase of the retrieval of a variable length buffer The second phase consists of allocating a buffer of the appropriate size and then filling it by reading the data across from the TSY.

Maintains the current phase of buffer retrieval.

Maintains the current phase of buffer retrieval.

Pointer to the user's asynchronous request status object.