Class TFindLogicalDevice

class TFindLogicalDevice : public TFindHandleBase;

Description

Searches for LDD factory objects by pattern matching against the names of LDD factory objects.

An LDD factory object is an instance of a DLogicalDevice derived class.

The match pattern can be set into this object at construction; it can also be changed at any time after construction by using TFindHandleBase::Find(const TDesC &).

After construction, call TFindLogicalDevice::Next(TFullName &) repeatedly to find successive LDD factory objects whose names match the current pattern. A successful call to TFindLogicalDevice::Next(TFullName &) means that a matching LDD factory object has been found.

The name of an LDD factory object is set by its Install() member function as part of the construction process.

Derivation

• TFindHandle - No description.

• TFindHandleBase - Base class for searching for global kernel objects.

• TFindLogicalDevice - ...

Members

Defined in TFindLogicalDevice:

• Next(TFullName &)Finds the full name of the next LDD factory object which matches the match patte...
• TFindLogicalDevice()Constructs the LDD factory object with a default match pattern.
• TFindLogicalDevice(const TDesC &)Constructs the LDD factory object with a specified match pattern.

Inherited from TFindHandleBase:

• Find(const TDesC &)Sets a new match pattern.
• TFindHandleBase(const TDesC &)Constructor with match pattern.

inline TFindLogicalDevice();

Description

Constructs the LDD factory object with a default match pattern.

The default match pattern, as implemented by the base class, is the single character "*".

A new match pattern can be set after construction by calling the TFindHandleBase::Find(const TDesC &) member function of the TFindHandleBase base class.

See also:

• TFindHandleBase::Find(const TDesC &)Sets a new match pattern.

inline TFindLogicalDevice(const TDesC &aMatch);

Description

Constructs the LDD factory object with a specified match pattern.

A new match pattern can be set after construction by calling TFindHandleBase::Find(const TDesC &).

Parameters

const TDesC16 &aMatch The match pattern.

See also:

• TFindHandleBase::Find(const TDesC &)Sets a new match pattern.

IMPORT_C TInt Next(TFullName &aResult);

Description

Finds the full name of the next LDD factory object which matches the match pattern.

Parameters

TBuf &aResult A reference to a TBuf descriptor with a defined maximum length. If a matching LDD factory object is found, its full name is set into this descriptor. If no matching LDD factory object is found, the descriptor length is set to zero.

Return value

TInt KErrNone, if a matching LDD factory object is found; KErrNotFound otherwise.