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活动对象

活动对象. 主要内容. 活动对象机制 活动对象的使用 用活动对象处理复杂事务. 活动对象机制. 活动对象框架 活动对象调度器 CActiveScheduler class CActiveScheduler : public CBase { friend class CActiveSchedulerWait; public: struct TLoop; typedef TLoop* TLoopOwner; public: IMPORT_C CActiveScheduler(); IMPORT_C ~CActiveScheduler();

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活动对象

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  1. 活动对象

  2. 主要内容 • 活动对象机制 • 活动对象的使用 • 用活动对象处理复杂事务

  3. 活动对象机制 • 活动对象框架 • 活动对象调度器CActiveScheduler class CActiveScheduler : public CBase { friend class CActiveSchedulerWait; public: struct TLoop; typedef TLoop* TLoopOwner; public: IMPORT_C CActiveScheduler(); IMPORT_C ~CActiveScheduler(); IMPORT_C static void Install(CActiveScheduler* aScheduler); IMPORT_C static void Add(CActive* aActive); IMPORT_C static void Start(); IMPORT_C static void Stop(); ... ... };

  4. 活动对象机制 • 活动对象框架 • 活动对象类CActive • class CActive : public CBase • { • public: • IMPORT_C ~CActive(); • IMPORT_C void Cancel(); • ... ... • protected: • IMPORT_C CActive(TInt aPriority); • IMPORT_C void SetActive(); • virtual void DoCancel() =0; • virtual void RunL() =0; • IMPORT_C virtual TInt RunError(TInt aError); • public: • TRequestStatus iStatus; • };

  5. 活动对象机制 • 活动对象的生命周期及操作顺序

  6. 活动对象的使用 • 实现活动对象的必要步骤 • （1）从CActive类派生活动对象类 • （2）实现活动对象类的构造函数 • （3）实现活动对象的二阶段构造函数ConstructL() • （4）实现CActive类的三个虚函数RunL()、DoCancel()、RunError() • （5）实现活动对象的析构函数

  7. 用活动对象处理复杂事务 • 活动对象的RunL()方法不能长时间占用CPU • 把复杂大任务分割成许多小任务进行处理

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