tsvallender tsvallender - 7 months ago 188
C# Question

Reading data metadata from JPEG, XMP or EXIF in C#

I've been looking around for a decent way of reading metadata (specifically, the date taken) from JPEG files in C#, and am coming up a little short. Existing information, as far as I can see, shows code like the following;

BitmapMetadata bmd = (BitmapMetadata)frame.Metadata;
string a1 = (string)bmd.GetQuery("/app1/ifd/exif:{uint=36867}");

But in my ignorance I have no idea what bit of metadata GetQuery() will return, or what to pass it.

I want to attempt reading XMP first, falling back to EXIF if XMP does not exist. Is there a simple way of doing this?



The following seems to work nicely, but if there's something bad about it, I'd appreciate any comments.

    public string GetDate(FileInfo f)
        using(FileStream fs = new FileStream(f.FullName, FileMode.Open, FileAccess.Read, FileShare.Read))
            BitmapSource img = BitmapFrame.Create(fs);
            BitmapMetadata md = (BitmapMetadata)img.Metadata;
            string date = md.DateTaken;
            return date;