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2.MCameraObserver---偵聽接口類
class MCameraObserver
{
public:
virtual void ReseverComplete(TInt aError)=0;
virtual void PowerOnComplete(TInt aError)=0;
virtual void ViewFinderFrameReady(CFbsBitmao& aFrame)=0;
virtual void ImageReady(CFbsBitmao* aBitmap,HBufC8* aData,TInt aError)=0;

}
二、步驟
1.創建和初始化
（1）聲明observer
class CImageCapturerEngine : public CBase, public MCameraObserver
{
public: // Observer interface
class MObserver
{
public:
virtual void OnFrame(const CFbsBitmap& aFrame)=0;
virtual void OnImage(CFbsBitmap* aBitmap)=0;
virtual void OnError(TInt aError)=0;
};

public: // Static constants
static const TInt KDefaultImageWidth;
static const TInt KDefaultImageHeight;
static const CCamera::TFormat KDefaultImageFormat;
static const TInt KDefaultImageIndex;

public: // Constructors and destructor
/**
* Two-phased constructor.
*/
static CImageCapturerEngine* NewL(MObserver& aObserver);

/**
* Destructor.
*/
~CImageCapturerEngine();

private:
/**
* EPOC default constructor.
*/
CImageCapturerEngine(MObserver& aObserver);
void ConstructL();

public: // Functions from MCameraObserver
/**
* Indicates camera reservation is complete.
* Called asynchronously when CCamera::Reserve() completes.
* @param aError: An error on failure and KErrNone on success
*/
void ReserveComplete(TInt aError);

/**
* Indicates camera power on is complete.
* Called on completion of CCamera:PowerOn().
* @param aError: An error on failure and KErrNone on success
*/
void PowerOnComplete(TInt aError);

/**
* Called periodically in response to the use of
* CCamera::StartViewFinderBitmapsL().
* @param aFrame: A view finder frame
*/
void ViewFinderFrameReady(CFbsBitmap& aFrame);

/**
* Called asynchronously when CCamera::CaptureImage() completes.
* Transfers the current image from the camera to the client.
* @param aBitmap: An image held in CFbsBitmap form if this was the
* format specified in CCamera::PrepareImageCaptureL().
* @param aData: a pointer to an HBufC8 if this was the format
* specified in CCamera::PrepareImageCaptureL().
* @param aError KErrNone on success or an error code on failure
*/
void ImageReady(CFbsBitmap* aBitmap,HBufC8* aData,TInt aError);

/**
* Called asynchronously when a buffer has been filled with the
* required number of video frames by CCamera::StartVideoCapture().
* Passes a filled frame buffer to the client.
* @param aFrameBuffer: A pointer to an MFrameBuffer if successful, or
* NULL if not successful.
* @param aError: KErrNone on success or an error code on failure
*/
void FrameBufferReady(MFrameBuffer* aFrameBuffer,TInt aError);

public: // new public methods
/**
* Start the view finder
*/
void StartViewFinderL();

/**
* Stop the view finder
*/
void StopViewFinder();

/**
* Asynchronously performs still image capture.
* Calls MCameraObserver::ImageReady() when complete.
*/
void CaptureImage();

private: // new private methods
/**
* Performs setup and allocation of memory.
* Called prior to calling CaptureImage() to keep the latency of that
* function to a minimum. Needs to be called only once for multiple
* CaptureImage() calls.
* May leave with KErrNotSupported or KErrNoMemory
* @param aImageFormat: The image format, must be one of the formats
* supported (see TCameraInfo::iImageFormatsSupported)
*/
void PrepareImageCaptureL(CCamera::TFormat aImageFormat);

private: // member variables
/**
*
*/
MObserver& iObserver;

/**
* The camera object
*/
CCamera* iCamera;

/**
* The resolution of the captured image.
*/
TSize iSize;
};

#endif