Archived:Displaying image information using Symbian C++

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Article Metadata

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Tested with

Devices(s): Nokia E61i
Nokia E90 Communicator
Nokia N95 8GB

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Compatibility

Platform(s): S60 3rd Edition, MR
S60 3rd Edition, FP1
S60 3rd Edition, FP2 Beta

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Article

Keywords: CFrameInfoStrings, CImageDecoder::FileNewL(), CImageDecoder::FrameInfoStringsL()

Created: tapiolaitinen (20 Mar 2008)

Last edited: hamishwillee (06 Aug 2012)

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.