C# Class GPS.Utils.ExifUtils

ExifUtils is a utility class that allow clients to get information like the "photo orientation" field from an image in Exif format. Exif (Exchangeable image file format) is the image file format used by digital cameras including those on smartphones.

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Public Methods

Method	Description
ExifUtils ( byte photoStreamBits ) : System	Initializes a new instance of the ExifUtils class.
GetOrientationFlag ( ) : int	Obtains the photo orientation field. For the valid values see the comment marked with "Photo Orientation field". If the photo orientation field cannot be obtained then it returns ExifUtils.UnknownOrientation.

Private Methods

Method	Description
AdvanceToApplicationMarker ( int applicationMarkerId, long &cursor ) : void	Advances the cursor to the given Application Marker immediately after the marker id.
AdvanceToExifApplicationMarker ( long &cursor ) : void	Advances the cursor to the Exif Application Marker immediately after the marker id.
GetInt16BigEndian ( long &cursor ) : int
GetInt32BigEndian ( long &cursor ) : int
GetTagInfo ( int targetTagNumber, long cursor ) : ExifTagInfo	Identifies and returns data about a given tag in the Image File Directory area. The cursor must be at the start of the Image File Directory area.
InternalGetOrientationFlag ( ) : int	Obtains the photo orientation field. For the valid values see the comment marked with "Photo Orientation field". If the photo orientation field cannot be obtained then it throws a FormatException.
SkipStartOfImageMarker ( long &cursor ) : void

Method Details

ExifUtils() public method

Initializes a new instance of the ExifUtils class.

public ExifUtils ( byte photoStreamBits ) : System
photoStreamBits	byte	/// The content in byte array form of the photo stream. This is the photo stream as returned /// by CameraCaptureTask or PhotoChooserTask in their Completed events in the /// ChosenPhoto field of the PhotoResult event arg. ///
return	System

GetOrientationFlag() public method

Obtains the photo orientation field. For the valid values see the comment marked with "Photo Orientation field". If the photo orientation field cannot be obtained then it returns ExifUtils.UnknownOrientation.

public GetOrientationFlag ( ) : int
return	int