From Forum Nokia Wiki

ID	CS000864	Creation date	March 28, 2008
Platform	S60 3rd Edition, MR S60 3rd Edition, FP1 S60 3rd Edition, FP2 Beta	Tested on devices	Nokia E61i Nokia E90 Communicator Nokia N95 8GB
Category	Symbian C++	Subcategory	Imaging

Keywords (APIs, classes, methods, functions): CFrameInfoStrings, CImageDecoder::FileNewL(), CImageDecoder::FrameInfoStringsL()

Overview

This code snippet demonstrates how to obtain and display the following information about an image:

• Decoder
• Format
• Dimensions
• Color depth
• Details

MMP file

The following libraries are required:

LIBRARY  imageconversion.lib

Header file

/**
 * Obtains the image info
 * @param aFs a reference to the file server session
 * @param aFilename the filename of the image
 * @return image info as CFrameInfoStrings*
 */
CFrameInfoStrings* CApp::GetImageInfoL(RFs& aFs, const HBufC& aFilename);

Source file

#include <ImageConversion.h>
 
const TInt KMaxInfoDescriptorLength = 80;

// Obtains the image info from the image referenced by the aFilename
CFrameInfoStrings* CApp::GetImageInfoL(RFs& aFs, const HBufC& aFilename)
    {
    CImageDecoder* decoder = CImageDecoder::FileNewL(aFs, aFilename);
    CleanupStack::PushL(decoder);
    CFrameInfoStrings* info = decoder->FrameInfoStringsL();
    CleanupStack::PopAndDestroy(decoder);
    return info;
    }

// Connect a client process to the fileserver
RFs fsSession;
User::LeaveIfError(fsSession.Connect());
CleanupClosePushL(fsSession);
 
// Obtain the image info
_LIT(KLITFilename, "C:\\Data\\Images\\image.jpg");
const HBufC* KFilename = KLITFilename().Alloc();
CFrameInfoStrings* info = GetImageInfoL(fsSession, *KFilename);
CleanupStack::PushL(info);
 
// Display the info items one by one
for (TInt i = 0; i < info->Count(); i++)
    {
    TBuf<KMaxInfoDescriptorLength> infoItem;
    infoItem.Append(info->String(i));
    CAknInformationNote* note = new (ELeave) CAknInformationNote(ETrue);
    note->ExecuteLD(infoItem);
    }
 
// Clean up
CleanupStack::PopAndDestroy(2);  // info, fsSession
fsSession.Close();

Postconditions

Image information is displayed.