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class CBTRegistryResponse : public CActive;
Retrieves a set of results from the Registry.
This is a helper class that retrieves a set of results as a view from the registry.
CBase
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Base class for all classes to be instantiated on the heap.
CActive
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The core class of the active object abstraction.
CBTRegistryResponse
- Retrieves a set of results from the Registry.
Defined in CBTRegistryResponse
:
DoCancel()
Implements cancellation of an outstanding request.NewL(RBTRegistry &)
Results()
RunError(TInt)
RunL()
Handles an active object's request completion event.Start(TRequestStatus &)
~CBTRegistryResponse()
Destructor Inherited from CActive
:
CActive(TInt)
Constructs the active object with the specified priority.Cancel()
Cancels the wait for completion of an outstanding request.Deque()
Removes the active object from the active scheduler's list of active objects.EPriorityHigh
A priority higher than EPriorityUserInput.EPriorityIdle
A low priority, useful for active objects representing background processing.EPriorityLow
A priority higher than EPriorityIdle but lower than EPriorityStandard.EPriorityStandard
Most active objects will have this priority.EPriorityUserInput
A priority higher than EPriorityStandard; useful for active objects handling use...Extension_(TUint,TAny *&,TAny *)
Extension function IsActive()const
Determines whether the active object has a request outstanding.IsAdded()const
Determines whether the active object has been added to the active scheduler's li...Priority()const
Gets the priority of the active object.SetActive()
Indicates that the active object has issued a request and that it is now outstan...SetPriority(TInt)
Sets the priority of the active object.TPriority
Defines standard priorities for active objects. iStatus
The request status associated with an asynchronous request.Inherited from CBase
:
Delete(CBase *)
Deletes the specified object.operator new(TUint)
Allocates the object from the heap and then initialises its contents to binary z...operator new(TUint,TAny *)
Initialises the object to binary zeroes.operator new(TUint,TLeave)
Allocates the object from the heap and then initialises its contents to binary z...operator new(TUint,TLeave,TUint)
Allocates the object from the heap and then initialises its contents to binary z...operator new(TUint,TUint)
Allocates the object from the heap and then initialises its contents to binary z...IMPORT_C static CBTRegistryResponse* NewL(RBTRegistry &aView);
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IMPORT_C void Start(TRequestStatus &aClientStatus);
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IMPORT_C RBTDeviceArray& Results();
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private: virtual void RunL();
Handles an active object's request completion event.
A derived class must provide an implementation to handle the completed request. If appropriate, it may issue another request.
The function is called by the active scheduler when a request completion event occurs, i.e. after the active scheduler's WaitForAnyRequest() function completes.
Before calling this active object's CBTRegistryResponse::RunL()
function, the active scheduler has:
1. decided that this is the highest priority active object with a completed request
2. marked this active object's request as complete (i.e. the request is no longer outstanding)
CBTRegistryResponse::RunL()
runs under a trap harness in the active scheduler. If it leaves, then the active scheduler calls CBTRegistryResponse::RunError(TInt)
to handle the leave.
Note that once the active scheduler's CBTRegistryResponse::Start(TRequestStatus &)
function has been called, all user code is run under one of the program's active object's CBTRegistryResponse::RunL()
or CBTRegistryResponse::RunError(TInt)
functions.
CActiveScheduler::Start()
Starts a new wait loop under the control of the current active scheduler.CActiveScheduler::Error(TInt)const
Handles the result of a leave occurring in an active object’s RunL() function.CActiveScheduler::WaitForAnyRequest()
Wait for an asynchronous request to complete.private: virtual void DoCancel();
Implements cancellation of an outstanding request.
This function is called as part of the active object's CActive::Cancel()
.
It must call the appropriate cancel function offered by the active object's asynchronous service provider. The asynchronous service provider's cancel is expected to act immediately.
CBTRegistryResponse::DoCancel()
must not wait for event completion; this is handled by CActive::Cancel()
.
CActive::Cancel()
Cancels the wait for completion of an outstanding request.