How to copy metadata from a photo to a rotated version of the photo in UWP?

Question

I can take a picture in Xamarin Forms UWP and rotate it (if necessary) and change it's size.
That all works fine. Not all the meta data gets copied over to the new photo.

I can get the meta data from the old photo like this:
ImageProperties propsIn = await filein.Properties.GetImagePropertiesAsync();
DateTimeOffset dateTaken = propsIn.DateTaken;

        var requests = new System.Collections.Generic.List<string>();
        requests.Add("System.ApplicationName");
        IDictionary<string, object> retrievedProps = await propsIn.RetrievePropertiesAsync(requests);

        string programName;
        if (retrievedProps.ContainsKey("System.ApplicationName"))
        {
            programName = (string)retrievedProps["System.ApplicationName"];
        }

But I can't find how to copy dateTaken and programName to the new photo.

Thanks for your interest in this.

Answer 1

Hello,

You could try the following code to copy the metadata to a new photo.

   if (retrievedProps.ContainsKey("System.ApplicationName"))  
   {  
       Bitmap theImage = new Bitmap(path);  
       var programName = (string)retrievedProps["System.ApplicationName"];  
       Encoding _Encoding = Encoding.UTF8;  
       PropertyItem[] propItems = theImage.PropertyItems;  
       var DataTakenProperty = propItems.Where(a => a.Id.ToString("x") == "9004").FirstOrDefault();  
       var programNamenProperty = propItems.Where(a => a.Id.ToString("x") == "9003").FirstOrDefault();  
       DataTakenProperty.Value = _Encoding.GetBytes(dateTaken.ToString());  
       programNamenProperty.Value = _Encoding.GetBytes(programName);  
       theImage.SetPropertyItem(programNamenProperty);  
       theImage.SetPropertyItem(DataTakenProperty);  
       theImage.Save(path);  
       theImage.Dispose();  
   }  

In addition, you could also use the Image class to get/set the EXIF information for your file.

Best Regards,

Alec Liu.

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