Get EXIF tags in Windows Phone 7

Question

I would like to get all the EXIF tags of an image I took in Windows Phone 7. I have tried using ExifLib, but can't seem to get it right.

In my event handler for CaptureImageAvailable I have the following code:

JpegInfo info = ExifReader.ReadJpeg(e.ImageStream, "Pic.jpeg");
Dispatcher.BeginInvoke(delegate()
 {
      textBox1.Text = info.ExposureTime.ToString();
      textBox2.Text = info.FNumber.ToString();
                                });

e.ImageStream.Close();

Both textBox1 and textBox2 are displaying 0.

My "Cam.Capture event" is fired every 200 milliseconds. Does this have any effect on these values?

Any help would be greatly appreciated! :)

Answer 1

I think everything is ok with your code, the values just aren't set.

Here is evidence that it's not your fault:

• Have a look at this blog post which basically is a tutorial on reading EXIF data. There you find a screenshot of the data: many values are set but the ones you need are also 0. But I am not sure if this photo really was taken with the phone camera.

• So I tested myself and the values are as follows; the fields you need are 0 as well:

  Artist  ""
  Copyright   null
  DateTime    "2011:11:01 20:50:07"
  Description null
  ExposureTime    0.0
  FileName    "\\Applications\\Data\\[GUID]\\Data\\PlatformData\\CameraCapture-[GUID].jpg.jpg"
  FileSize    789355
  Flash   No
  FNumber 0.0
  GpsLatitude {double[3]}
  GpsLatitudeRef  Unknown
  GpsLongitude    {double[3]}
  GpsLongitudeRef Unknown
  Height  1944
  IsColor true
  IsValid true
  LoadTime    {00:00:00.1340000}
  Make    "HTC"
  Model   "7 Trophy"
  Orientation TopRight
  ResolutionUnit  Inch
  Software    "Windows Phone 7.5"
  ThumbnailData   {byte[14913]}
  ThumbnailOffset 518
  ThumbnailSize   14913
  UserComment null
  Width   2592
  XResolution 72.0
  YResolution 72.0
  

Looks like doing something with the EXIF every 200ms is not the cause. Out of curiosity I had a second look at the EXIF data after synching the pictures with the PC. The values are just not there. Sorry.