Set Exif Gps Info Latitude.

[shashishaw]

Hi all,
I want to add the available GPS information like Latitude and longitude to an image file captured using the device camera. It is in the exif format and has fields for the GPS tags. I am using S603rd FP1 SDK and CExifModify classes to
set the GPS tags. I am able to set the Latitude and longitude reference values which require Ascii values to be set, but i am unable to set latitude and longitude values since these require rational values.

My problem is I am unable to set the latitude information from rational to the descriptor format.

How do i convert the latitude information say 24.121212 into descriptor format which can be used to set the latitude tag.

Any pointers to the solution will be helpful.
Regards,
Shashi.

[rvogt]

I know this is a pretty old thread. However I have exactly the same problem.

How do I have to build the descriptor variable (test1 in my case) using a given latitude/longitude value? If I pass invalid values in the test1 variable the phone crashes. (immediately reboot)

Sample code:
TBuf8<24> test1;
test1.SetMax();
// fill test1 variable
modify->SetTagL(EIfdGps,TExifTagInfo(0x04,CExifTag::ETagRational,3),test1);

[jitinarora]

hi,
I have worked on this and it is working fine with me.

There are two ways for this:
1.Creating exif header and adding GPS info tags to it.
2.Modifying existing exif header

Here you can use TExifWriterUtility class for writing/modifying tad values such as SetGpsLongitude(TInt DegNumerator,TInt DegDenominator,TInt MinNumerator,TInt MinDenomonator,TInt SecNumerator,TInt SecDenomnitor);
For example you want to set 5degree 55 min 30 sec, you can pass these as:
SetGpsLongitude (5,1,55,1,30,1) or SetGpsLongitude(10,2,110,2,60,2);
Both are equal here as 10/2 = 5/1 and 110/2 = 55/1 and 60/2 =30/1

[rvogt]

Hi

Thanks for your reply.
I would love to use the classes TExifWriterUtility and TExifWriterUtility. However it seems there is no public documentation available and the required header file are not part of the sdk.
Any ideas?

[jitinarora]

hi,
It is publically avaialable in Symbian OS 9.2 release.

Location: ExifUtility.h
Link against: exifutility.lib

[rvogt]

hi,
It is publically avaialable in Symbian OS 9.2 release.

Location: ExifUtility.h
Link against: exifutility.lib

No, it seems not. At least not in the S60 sdk. Maybe it is in the uiq sdk. :-(
Anyway thanks for your help.

So, I'm still looking for a way to encode the aTagData variable as a rational value in the class CExifModify

SetTagL (TExifIfdType aIfdType, TExifTagInfo aExifTagInfo, const TDesC8 &aTagData)

[jitinarora]

Can you please tell me which version of SDK you are using?

[rvogt]

Can you please tell me which version of SDK you are using?

S60 3rd Edition SDK for Symbian OS, Supporting Feature Pack 1, for C++
(Symbian\9.2\S60_3rd_FP1)

[jitinarora]

HI,
It is publically avaialable.
Please refer to following link:

http://www.symbian.com/developer/tec...lityClass.html

Its publically published.

[rvogt]

Could be, but the documentation does not explain how to instantiate a class TExifWriterUtility / MExifMetadataWriter.
Can you please send me your part of the code that does this?

The required header files (ExifUtility.h, ICLExif.h) are not part of the sdk.

The local documentation of the class TExifWriterUtility of the sdk contains the following sentence:
"This item is not part of the S60 3rd Edition SDK for Symbian OS, Supporting Feature Pack 1, for C++."

[jitinarora]

You can refer following code:

iSession.Connect();
_LIT8(KMimeType,"image/jpeg");
iEncoder = STATIC_CAST(CJPEGExifEncoder*, CJPEGExifEncoder::FileNewL(iSession,aPath,KMimeType));
aMetaData = iEncoder->ExifMetadata();

TInt testResult;
TExifWriterUtility writer(aMetaData);
writer.SetGpsLongitude();

[rvogt]

Hi
What SDK version do you use? (S60 / uiq) Do you have any additional libraries installed?

Because I my installed SDK all these classes (CJPEGExifEncoder, TExifWriterUtility, MExifMetadataWriter) are missing (Missing header and lib files)

[symbianyucca]

Those files are not included in public SDKs, as clearly indicated by the SDK documentation (3rd ED FP1 SDK's help documentation).

Anyway, as the version of the GPS tag is known (or at least if we assume that it is known), then you can do the non-public parts pretty nicely by yourself.

Anyway, I made a full example, and you could get it from the Wiki: http://wiki.forum.nokia.com/index.ph...ng_Example.zip

[rvogt]

Hi

Thanks for sharing this example code. In the meantime I found the solution myself. However I'm sure other people can use your example code.

[bufo.ntu]

How do u slove this problem? Can u share to me? can u mange to fing the ExifUtility.h file or ExifUtility.lib?