Example usage for How to read images to Symbian bitmap

[Eagle King]

My old topic: How to display image (image's path is inputted by user)

I have solved my problem with wizard_hu's help. And I saw this article doesn't have example usage. I searched in google. I found that there are someones got someproblems with this article and didn't solve them. So I want to show them a way to use this article.
How to read images to Symbian bitmap

ImageConverter.h

#ifndef __IMAGECONVERT_h__
#define __IMAGECONVERT_h__


#include <e32base.h>
#include <coecntrl.h>
#include <w32std.h>
#include <e32std.h> 
#include <ImageConversion.h>

class CFbsBitmap;
class CBitmapScaler;

class MImageConverterObserver
{
	public:
		virtual void ConversionComplete(TInt aError) = 0;
};
 
class CImageConverter : public CActive
{
	public:
	    CImageConverter(MImageConverterObserver* aObserver);
	    void ConstructL(const TDesC& aFileName);
	    ~CImageConverter();
	public:
	    CFbsBitmap* Bitmap();
	protected:
		void DoCancel();
		void RunL();
	private:
		MImageConverterObserver*	iObserver;
		CImageDecoder*			iImageDecoder;
		CFbsBitmap*				iImage;
		TFileName				iImageName;
};

#endif // __IMAGECONVERT_h__

ImageConverter.cpp

#include <eikenv.h>
#include <BitmapTransforms.h>
#include "imageconverter.h"
 
CImageConverter::CImageConverter(MImageConverterObserver* aObserver)
:CActive(0)
    {
    iObserver = aObserver;
	CActiveScheduler::Add(this);
    }
 
CImageConverter::~CImageConverter()
{
	Cancel();
	//delete iImage;
	delete iImageDecoder;
}
 
 
void CImageConverter::ConstructL(const TDesC& aFileName)
{
	iImageName.Copy(aFileName);
	
	if(iImageName.Length())
	{		
		if(iImageDecoder)
		{
			delete iImageDecoder;
			iImageDecoder = 0;
		}
		iImageDecoder = CImageDecoder::FileNewL(CCoeEnv::Static()->FsSession(),aFileName);
 
		delete iImage;
		iImage = NULL;
		iImage = new(ELeave)CFbsBitmap();
		iImage->Create(iImageDecoder->FrameInfo(0).iOverallSizeInPixels,iImageDecoder->FrameInfo(0).iFrameDisplayMode);
 
		iImageDecoder->Convert(&iStatus,*iImage,0);
		SetActive();
	}
}

 
void CImageConverter::DoCancel()
{
	iImageDecoder->Cancel();
}
 
//Transfering ownership of image, so calling function must delete it.
CFbsBitmap* CImageConverter::Bitmap()
{
	return iImage;
}
 
	
void CImageConverter::RunL()
{
	if(iStatus == KErrNone)
	{
		iObserver->ConversionComplete(iStatus.Int());
	}
	else
	{
		delete iImage;
		iImage = 0;
	}
}

Example usage:

//Edit View.h or Container.h:
#include "ImageConverter.h"
// CLASS DECLARATION
class CImageReaderAppView : public CCoeControl, MImageConverterObserver

//Add more function to class:
public: //MImageConverterObserver
	void ConversionComplete(TInt aError);

//Add more data to class:
private://data
	CFbsBitmap* iBitmap;
	CImageConverter* iImageConverter;

//Edit ContructL in View.cpp or Container.cpp:
void CImageReaderAppView::ConstructL(const TRect& aRect)
	{
	// Create a window for this application view
	CreateWindowL();

	// Set the windows size
	SetRect(aRect);

	//Convert Image to Bitmap
	iImageConverter = new (ELeave) CImageConverter(this);
	
	iImageConverter->ConstructL(_L("\\Data\\Images\\lokki2.jpg"));
	// Activate the window, which makes it ready to be drawn
	ActivateL();
	}

//Draw picture:
if(iBitmap)
	{
	gc.BitBlt(TPoint(0,0), iBitmap);
	}

Note: You must add fbscli.lib and imageconversion.lib to your MMP file.

[symbianyucca]

in a class you would want to use the code, you would just derive MImageConverterObserver and implement the function defined in the MImageConverterObserver. Then just have the CImageConverter as a member variable of that same class, and construct instance of it, just as you have done.

Anyway do use a drive letter with the path. as well as use the Bitmap() from the CImageConverter , instead of iBitmap of the class when drawing.

[Eagle King]

Anyway do use a drive letter with the path. as well as use the Bitmap() from the CImageConverter , instead of iBitmap of the class when drawing.

I got your idea. It will make the program faster. thanks