Archived:Using Exif API for Symbian C++
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Revision as of 14:16, 21 January 2010
Article Metadata
Tested with
Devices(s): Nokia N95
Compatibility
Platform(s): S60 3rd Edition, MR
Article
Keywords: CExifRead
Created: (20 May 2008)
Last edited: tanjaluodes
(21 Jan 2010)
Overview
The CExifRead Interface class is used for parsing the Exif v2.2 file format. With this API you can read data from JPEG images, such as date, resolution, orientation, ISO speed, and exposure time.
MMP file
The following capabilities and libraries are required:
CAPABILITY NONE
LIBRARY efsrv.lib
LIBRARY exiflib.lib
Header file
Class for reading Exif data.
#include <exifread.h>
#include <f32file.h>
class CMyExifReader : public CBase
{
public:
static CMyExifReader* NewL();
static CMyExifReader* NewLC();
virtual ~CMyExifReader();
private:
CMyExifReader();
void ConstructL();
public:
void ReadExifDataL(TDesC& aFilename);
public:
HBufC8* iImageDescription;
HBufC8* iImageDate;
};
Source file
CMyExifReader::CMyExifReader()
{
}
CMyExifReader* CMyExifReader::NewL()
{
CMyExifReader* self = NewLC();
CleanupStack::Pop();
return self;
}
CMyExifReader* CMyExifReader::NewLC()
{
CMyExifReader* self = new (ELeave) CMyExifReader();
CleanupStack::PushL( self );
self->ConstructL();
return self;
}
void CMyExifReader::ConstructL()
{
}
CMyExifReader::~CMyExifReader()
{
delete iImageDescription;
delete iImageDate;
}
void CMyExifReader::ReadExifDataL(TDesC& aFilename)
{
// 1. Read Exif image from the file to a buffer
RFile file;
User::LeaveIfError( file.Open( CEikonEnv::Static()->FsSession(), aFilename, EFileRead ) );
CleanupClosePushL( file );
TInt size = 0;
file.Size(size);
HBufC8* exif = HBufC8::NewL( size );
CleanupStack::PushL( exif );
TPtr8 bufferDes( exif->Des() );
User::LeaveIfError( file.Read( bufferDes ) );
CleanupStack::Pop( exif );
CleanupStack::PopAndDestroy(); // file
CleanupStack::PushL( exif );
// 2. Instantiate Exif reader...
CExifRead* read = CExifRead::NewL( exif->Des() );
CleanupStack::PushL( read );
// 3. Get required data from the Exif image...
TInt err = KErrNone;
TRAP(err,iImageDescription = read->GetImageDescriptionL());
TRAP(err,iImageDate = read->GetDateTimeL());
// TODO: See CExifRead API for getting more data from image
// 4. Delete the reader instance...
CleanupStack::PopAndDestroy( read );
CleanupStack::PopAndDestroy( exif );
}
Postconditions
Exif data read from the given image.
