User-side interface class in .NET framework

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13.3.2 User-side interface class
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Figure 13.6 shows the derivation of the TBusLocalDrive class. Normally, the user-side interface to a device driver consists solely of an RBusLogicalChannel-derived class containing only inline methods. In this case, RLocalDrive provides this thin class. However, here we further derive TBusLocalDrive from RLocalDrive to provide the local media user interface and this contains functions exported from the
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PERIPHERAL SUPPORT
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RBusLogicalChannel
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RLocalDrive
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TBusLocalDrive
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Figure 13.6 Derivation of TBusLocalDrive
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user library (EUSER.DLL). TBusLocalDrive adds code to handle the user-side processing of drive format and password protection operations. However, the main reason for the derivation of TBusLocalDrive from RLocalDrive is to preserve compatibility with EKA1. It is needed there so that it can perform the far greater amount of user-side processing, which is necessary to cope with the issues associated with handling asynchronous I/O in device drivers. These are the major elements of the public interface to the TBusLocalDrive class:
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class TBusLocalDrive : public RLocalDrive { public: TBusLocalDrive(); TInt Connect(TInt aDriveNumber, TBool& aChangedFlag); void Disconnect(); TInt Caps(TDes8& anInfo); TInt Read(TInt64 aPos,TInt aLength,const TAny* aTrg, TInt aMessageHandle,TInt aOffset); TInt Write(TInt64 aPos,TInt aLength,const TAny* aSrc, TInt aMessageHandle,TInt aOffset); Format(TFormatInfo& anInfo); Format(TInt64 aPos,TInt aLength); TInt Enlarge(TInt aLength); TInt ReduceSize(TInt aPos, TInt aLength); TInt ForceRemount(TUint aFlags=0); SetMountInfo(const TDesC8* aMountInfo, TInt aMessageHandle) };
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The method Connect() is used to open a channel to the speci ed local drive, aDriveNumber. The second parameter, aChangedFlag, is used to provide noti cation that a drive remount is required. Once the drive is connected, this ag is set true on each media change. When connecting to each local drive, the le server passes in a reference to the data member iChanged belonging to the corresponding TDrive object, and this is how it receives noti cation of a possible change of volume see
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MEDIA DRIVERS AND THE LOCAL MEDIA SUB-SYSTEM
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Section 9.3.3.1. The method Disconnect() dissociates the object from any drive. Next I will list the standard local media operations. The Caps() method returns information on the capabilities of a connected drive. Three forms of both the read and write methods are provided (although I ve only listed one of each for brevity). The read version shown is the one used for inter-thread communication. It fully speci es the target memory location:
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TInt Read(TInt64 aPos,TInt aLength,const TAny* aTrg, TInt aMessageHandle, TInt aOffset);
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This method reads aLength bytes from offset aPos on the drive. Parameter aTrg is a pointer to a target descriptor in memory and aOffset speci es the offset within this to start storing the data. Parameter aMessageHandle is a handle to the message object associated with the F32 client request and this allows the local media LDD to identify the target thread. The corresponding inter-thread write method is also shown. Two versions of the Format() method are provided. The rst is used when formatting the entire connected drive that is, setting each memory element of the drive to a default state and detecting any hardware faults across the drive. The second method is used to format (or erase) just a speci ed region within the drive. The methods Enlarge() and ReduceSize() are used to control the size of a variable sized disk typically only used for internal RAM drives. The method ForceRemount() is used to close the media driver currently associated with the drive and force the local media sub-system to reopen the most appropriate driver. This is useful in situations where a new media driver has recently been installed on the system. ForceRemount() is then used to replace the existing driver with the new version. Also, some media drivers may need to be supplied with security information to open. This is achieved using the SetMountInfo() function. ForceRemount() is then used to retry the opening the driver once the appropriate mount information has been supplied. A second media change noti cation scheme, in addition to that provided via the TBusLocalDrive::Connect() method, is available from the base class RLocalDrive. This is the method:
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RLocalDrive::NotifyChange(TRequestStatus* aStatus);
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The le server also uses this second scheme. The active object CNotifyMediaChange makes use of it when requesting noti cation of media change events to pass on to F32 clients see Section 9.4.3.4.
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