Class TDesBuf

TDesBuf

Support

Supported from 5.0

Description

A stream buffer that uses a descriptor for its implementation.

A stream of this type is used by RDesWriteStream and RDesReadStream objects. It also has intermediate buffering capabilities.

This is a seekable stream buffer.

When used in write mode, the length of the descriptor is only updated when the stream buffer's SynchL() function is called, i.e. as a result of a call to RWriteStream::CommitL().

Derivation

MStreamBuf A stream buffer that provides a generic I/O interface for streamed data TDesBuf A stream buffer that uses a descriptor for its implementation TStreamBuf Adds buffering capabilities to a stream buffer

Defined in TDesBuf:
Set(), TDesBuf()

Inherited from MStreamBuf:
SeekL(), Close(), DoRelease(), DoSeekL(), DoSynchL(), ERead, EWrite, PushL(), Read(), ReadL(), Release(), SeekL(), SizeL(), Synch(), SynchL(), TMark, TRead, TWrite, TellL(), Write(), WriteL()

Inherited from TStreamBuf:
Avail(), DoReadL(), DoWriteL(), End(), OverflowL(), Ptr(), SetBuf(), SetEnd(), SetPtr(), TArea, UnderflowL()

See also:

• RDesWriteStream
• RDesReadStream
• RWriteStream::CommitL()
• MStreamBuf::SynchL()

TDesBuf();

Description

Constructs an empty object.

Call Set() before using the object.

void Set(TDes8& aDes,TInt aMode=ERead|EWrite);

Description

Sets up the stream to use the specified descriptor.

Parameters

TDes8& aDes The descriptor that hosts the stream and that also acts as the intermediate buffer. TInt aMode The mode in which the buffer is to be used. It can be used in either or both read and write modes, represented by ERead and EWrite.

See also:

• TDes8
• MStreamBuf::TRead
• MStreamBuf::TWrite