How to write a conversion observer

Converter clients can supply a converter observer object by implementing the MConverterUiObserver interface. The object is passed to the converter's ConvertL(), ConvertObjectL(), ConvertAL() or ConvertObjectAL() function. It is used for reporting on the progress of multi-step conversions and for requesting a password from the client when the file being converted from is password-protected.

It has the following functions:

• virtual void MaxSteps(TInt aMax, TInt aObject)=0; can be implemented to get the maximum number of steps that the conversion operation can take,

• virtual TInt Result(TInt aResult, TInt aObject)=0; can be implemented to take some action following an error in the conversion,

• virtual HBufC* QueryPasswordL(const TDesC& aClue)=0; can be implemented to request a password from the user in order to access the data.