Symbian OS中的Client/Server机制分析

核心提示：aType=EOwnerProcess);IMPORT_C TInt Open(TInt aArgumentIndex, const TSecurityPolicy& aServerPolicy, TOwnerType aType=EOwnerProcess);inline TInt SetReturnedHandle

aType=EOwnerProcess);

IMPORT_C TInt Open(TInt aArgumentIndex, const TSecurityPolicy& aServerPolicy, TOwnerType aType=EOwnerProcess);

inline TInt SetReturnedHandle(TInt aHandleOrError);

IMPORT_C TInt SetReturnedHandle(TInt aHandleOrError,const TSecurityPolicy& aServerPolicy);

protected:

inline TInt CreateSession (const TDesC& aServer,const TVersion& aVersion);

IMPORT_C TInt CreateSession (const TDesC& aServer,const TVersion& aVersion,TInt aAsyncMessageSlots);

IMPORT_C TInt CreateSession (const TDesC& aServer,const TVersion& aVersion,TInt aAsyncMessageSlots,TIpcSessionType aType,const TSecurityPolicy* aPolicy=0, TRequestStatus* aStatus=0);

inline TInt CreateSession (RServer2 aServer,const TVersion& aVersion);

IMPORT_C TInt CreateSession (RServer2 aServer,const TVersion& aVersion,TInt aAsyncMessageSlots);

IMPORT_C TInt CreateSession (RServer2 aServer,const TVersion& aVersion,TInt aAsyncMessageSlots,TIpcSessionType aType,const TSecurityPolicy* aPolicy=0, TRequestStatus* aStatus=0);

inline static TInt SetReturnedHandle(TInt aHandleOrError,RHandleBase& aHandle);

inline TInt Send (TInt aFunction,const TIpcArgs& aArgs) const;

inline void SendReceive (TInt aFunction,const TIpcArgs& aArgs,TRequestStatus& aStatus) const;

inline TInt SendReceive (TInt aFunction,const TIpcArgs& aArgs) const;

inline TInt Send (TInt aFunction) const;

inline void SendReceive (TInt aFunction,TRequestStatus& aStatus) const;

inline TInt SendReceive (TInt aFunction) const;

。。。

};

这个类提供了很多重载的CreateSession ()方法，根据需要进行选择，涉及到几个概念就是消息槽和IPC Session的类型，可以根据SDK的描述使用，SDK有详细的阐述，没有用到过，这里就不详述了。

SendReceive ()也有很多重载的方法，主要是同/异步的选择，那些没有