| class CAsyncCallBack : public CAsyncOneShot |
An active object that performs its processing through an associated call back function, and which is only performed once.
| Public Member Functions | |
|---|---|
| CAsyncCallBack(TInt) | |
| CAsyncCallBack(const TCallBack &, TInt) | |
| ~CAsyncCallBack() | |
| IMPORT_C void | CallBack() |
| IMPORT_C void | Set(const TCallBack &) |
| Protected Member Functions | |
|---|---|
| void | RunL() |
| Inherited Enumerations | |
|---|---|
| CActive:TPriority | |
| Protected Attributes | |
|---|---|
| TCallBack | iCallBack |
| Inherited Attributes | |
|---|---|
| CActive::iStatus | |
| IMPORT_C | CAsyncCallBack | ( | const TCallBack & | aCallBack, |
| TInt | aPriority | |||
| ) | ||||
| void | RunL | ( | ) | [protected, virtual] |
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 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)
RunL() runs under a trap harness in the active scheduler. If it leaves, then the active scheduler calls RunError() to handle the leave.
Note that once the active scheduler's Start() function has been called, all user code is run under one of the program's active object's RunL() or RunError() functions.
CActiveScheduler::WaitForAnyRequest
TRAPD
| IMPORT_C void | Set | ( | const TCallBack & | aCallBack | ) |
| const TCallBack & aCallBack |
| TCallBack | iCallBack | [protected] |
The callback object that encapsulates the callback function.